SwipeRefreshLayout exists as a support library and enables us implement the now popular Swipe to Refresh.Some call it Pull To Refresh,some drag to refresh but the concept is simple,pull or swipe down on your layout and this causes display of a small progress circle.We can then of course capitalize on that and refresh our dataset.

Example 1 – Android SwipeRefreshLayout with RecyclerView -> Simulate Updates

This is a Swipe To Refresh tutorial.

We want that when the user pulls at the top of our layout we refresh data. This is a very popular technique for refreshing data that is implemented by so many mobile apps.

In this case our widget is a recyclerview.

Let’s go.

What we do :

  • Custom RecyclerView with cardviews with images and text.
  • Our data source is a simple arraylist.
  • Use SwipeRefreshlayout.
  • When user swipes down,we simulate downloading of fresh copies of data.
  • We do this in background thread using handlers.
  • Rebind the data to our recyclerview.

===

1. Create Basic Activity Project

  1. First create an empty project in android studio. Go to File –> New Project.
  2. Type the application name and choose the company name.
    New Project Dialog
  3. Choose minimum SDK.
    Choose minimum SDK
  4. Choose Basic activity.
    Choose Empty Activity
  5. Click Finish.
    Finish

Basic activity will have a toolbar and floating action button already added in the layout

Normally two layouts get generated with this option:

No. Name Type Description
1. activity_main.xml XML Layout Will get inflated into MainActivity Layout.Typically contains appbarlayout with toolbar.Also has a floatingactionbutton.
2. content_main.xml XML Layout Will be included into activity_main.xml.You add your views and widgets here.
3. MainActivity.java Class Main Activity.

In this example I used a basic activity.

The activity will automatically be registered in the android_manifest.xml. Android Activities are components and normally need to be registered as an application component.

If you’ve created yours manually then register it inside the <application>...<application> as following, replacing the MainActivity with your activity name:


        <activity android_name=".MainActivity">

            <intent-filter>

                <action android_name="android.intent.action.MAIN" />

                <category android_name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

You can see that one action and category are specified as intent filters. The category makes our MainActivity as launcher activity. Launcher activities get executed first when th android app is run.

Advantage of Creating Basic Activity project

You can optionally choose empty activity over basic activity for this project.

However basic activity has the following advantages:

No. Advantage
1. Provides us a readymade toolbar which gives us actionbar features yet easily customizable
2. Provides us with appbar layout which implements material design appbar concepts.
3. Provides a FloatinActionButton which we can readily use to initiate quick actions especially in examples like these.
4. Decouples our custom content views and widgets from the templating features like toolbar.

Generated Project Structure

AndroidStudio will generate for you a project with default configurations via a set of files and directories.

Here are the most important of them:

No. File Major Responsibility
1. build/ A directory containing resources that have been compiled from the building of application and the classes generated by android tools. Such a tool is the R.java file. R.java file normally holds the references to application resources.
2. libs/ To hold libraries we use in our project.
3. src/main/ To hold the source code of our application.This is the main folder you work with.
4. src/main/java/ Contains our java classes organized as packages.
5. src/main/res/ Contains our project resources folders as follows.
6. src/main/res/drawable/ Contains our drawable resources.
7. src/main/res/layout/ Contains our layout resources.
8. src/main/res/menu/ Contains our menu resources XML code.
9. src/main/res/values/ Contains our values resources XML code.These define sets of name-value pairs and can be strings, styles and colors.
10. AndroidManifest.xml This file gets autogenerated when we create an android project.It will define basic information needed by the android system like application name,package name,permissions,activities,intents etc.
11. build.gradle Gradle Script used to build the android app.

2. Add Dependencies

In your build.gradle:

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.2.1'
    compile 'com.android.support:design:23.2.1'
    compile 'com.android.support:cardview-v7:23.2.1'

}

3. Create User Interface

User interfaces are typically created in android using XML layouts as opposed by direct java coding.

This is an example fo declarative programming.

Advantages of Using XML over Java
No. Advantage
1. Declarative creation of widgets and views allows us to use a declarative language XML which makes is easier.
2. It’s easily maintanable as the user interface is decoupled from your Java logic.
3. It’s easier to share or download code and safely test them before runtime.
4. You can use XML generated tools to generate XML

Here are our layouts for this project:

(a). activity_main.xml

  • This layout gets inflated to MainActivity user interface.
  • It includes the content_main.xml.

Here are some of the widgets, views and viewgroups that get employed”

No. View/ViewGroup Package Role
1. CordinatorLayout android.support.design.widget Super-powered framelayout that provides our application’s top level decoration and is also specifies interactions and behavioros of all it’s children.
2. AppBarLayout android.support.design.widget A LinearLayout child that arranges its children vertically and provides material design app bar concepts like scrolling gestures.
3. ToolBar <android.support.v7.widget A ViewGroup that can provide actionbar features yet still be used within application layouts.
4. FloatingActionButton android.support.design.widget An circular imageview floating above the UI that we can use as buttons.
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 
    
    
    android_layout_width="match_parent"
    android_layout_height="match_parent"
    android_fitsSystemWindows="true"
    tools_context="com.tutorials.hp.swiperefreshrecyclerview.MainActivity">

    <android.support.design.widget.AppBarLayout
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        android_theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android_id="@+id/toolbar"
            android_layout_width="match_parent"
            android_layout_height="?attr/actionBarSize"
            android_background="?attr/colorPrimary"
            app_popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main" />

    <android.support.design.widget.FloatingActionButton
        android_id="@+id/fab"
        android_layout_width="wrap_content"
        android_layout_height="wrap_content"
        android_layout_gravity="bottom|end"
        android_layout_margin="@dimen/fab_margin"
        android_src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

(b). content_main.xml

This layout gets included in your activity_main.xml.
We define recyclerview inside a SwipeRefreshLayout here.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    
    
    android_layout_width="match_parent"
    android_layout_height="match_parent"
    android_paddingBottom="@dimen/activity_vertical_margin"
    android_paddingLeft="@dimen/activity_horizontal_margin"
    android_paddingRight="@dimen/activity_horizontal_margin"
    android_paddingTop="@dimen/activity_vertical_margin"
    app_layout_behavior="@string/appbar_scrolling_view_behavior"
    tools_context="com.tutorials.hp.swiperefreshrecyclerview.MainActivity"
    tools_showIn="@layout/activity_main">

    <android.support.v4.widget.SwipeRefreshLayout
        android_id="@+id/swiper"
        android_layout_width="match_parent"
        android_layout_height="wrap_content">

        <android.support.v7.widget.RecyclerView
            android_id="@+id/mRecycler"
            android_layout_width="match_parent"
            android_layout_height="match_parent"
            >
        </android.support.v7.widget.RecyclerView>

    </android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>

(c). model.xml

RecyclerViewItem row model.

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 
    android_orientation="horizontal" android_layout_width="match_parent"
    
    android_layout_margin="10dp"
    card_view_cardCornerRadius="10dp"
    card_view_cardElevation="10dp"

    android_layout_height="wrap_content">

    <RelativeLayout
        android_layout_width="match_parent"
        android_layout_height="match_parent">

        <ImageView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_id="@+id/movieImage"
            android_padding="10dp"
            android_src="@drawable/ghost" />

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceLarge"
            android_text="Name"
            android_id="@+id/nameTxt"
            android_padding="10dp"
            android_textColor="@color/colorAccent"
            android_layout_below="@+id/movieImage"
            android_layout_alignParentLeft="true"
             />

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceLarge"
            android_text=" John Doe a former FBI Agent and now Physics teacher .is wrongly accussed of murdering an innocent child.He makes it his business to find the bad guys who did taht.He convinces hacker Aram to join him.....
            "
            android_id="@+id/descTxt"
            android_padding="10dp"
            android_layout_below="@+id/nameTxt"
            android_layout_alignParentLeft="true"
            />

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceMedium"
            android_text="TV Show"
            android_id="@+id/posTxt"
            android_padding="10dp"

            android_layout_below="@+id/movieImage"
            android_layout_alignParentRight="true" />

        <CheckBox
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_id="@+id/chk"
            android_layout_alignParentRight="true"
            />

    </RelativeLayout>
</android.support.v7.widget.CardView>

SECTION 2 : Our Data Object

Spacecraft.java

Main Responsibility : IS A SINGLE DATA OBJECT

  • Represents a single object.Here I’ll use Movie.
  • The object shall have various properties like name,image etc.
  • Each object shall occupy a specific viewitem, here cardview.
package com.tutorials.hp.swiperefreshlistviewexample;

public class Movie {

    private String name;
    private int image;

    public Movie(String name, int image) {
        this.name = name;
        this.image = image;
    }

    public String getName() {
        return name;
    }

    public int getImage() {
        return image;
    }
}

SECTION 3 : Adapter class

ItemClickListener inetrface

Main Responsibility : DEFINES ITEMCLICK EVENT HANDER SIGNATURE

  • Define our ListView ViewItem’s signature for our OnItemClick methods.
package com.tutorials.hp.swiperefreshlistviewexample;

public interface ItemClickListener {

    void onItemClick();

}

View Holder class

Main Responsibility : HOLD VIEWS FOR RECYCLING.

  • In this case textviews and imageviews.
package com.tutorials.hp.swiperefreshlistviewexample;

import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

public class MyViewHolder implements View.OnClickListener {

    ImageView img;
    TextView nameTxt;
    ItemClickListener itemClickListener;

    public MyViewHolder(View v) {
        img= (ImageView) v.findViewById(R.id.movieImage);
        nameTxt= (TextView) v.findViewById(R.id.nameTxt);

        v.setOnClickListener(this);

    }

    public  void setItemClickListener(ItemClickListener ic)
    {
        this.itemClickListener=ic;
    }

    @Override
    public void onClick(View v) {
        this.itemClickListener.onItemClick();
    }
}

Custom Adapter class

Main Responsibility : HELPS US BIND CUSTOM DATA TO LISTVIEW.

  • You can use one line of code to bind simple data to listview.
  • But for custom data like ours,we need an adapter to adapt it.
  • We shall use BaseAdapter as our Base class.
  • Our BaseAdapter subclass shall receive an arraylist and a context.
  • We shall simulate fetching updates.
  • We do this in background thread using Handlers.
  • Meanwhile we show a progress circle.
package com.tutorials.hp.swiperefreshlistviewexample;

import android.content.Context;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Random;

public class CustomAdapter extends BaseAdapter {

    Context c;
    ArrayList<Movie> movies;
    SwipeRefreshLayout swipe;

    LayoutInflater inflater;

    public CustomAdapter(Context c, ArrayList<Movie> movies,SwipeRefreshLayout swipe) {
        this.c = c;
        this.movies = movies;
        this.swipe=swipe;
    }

    @Override
    public int getCount() {
        return movies.size();
    }

    @Override
    public Object getItem(int position) {
        return movies.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        if(inflater==null)
        {
            inflater= (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        if(convertView==null)
        {
            convertView=inflater.inflate(R.layout.model,parent,false);
        }

        MyViewHolder holder=new MyViewHolder(convertView);
        holder.nameTxt.setText(movies.get(position).getName());
        holder.img.setImageResource(movies.get(position).getImage());

        holder.setItemClickListener(new ItemClickListener() {
            @Override
            public void onItemClick() {
                Toast.makeText(c, movies.get(position).getName(), Toast.LENGTH_SHORT).show();
            }
        });

        swipe.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                refresh();
            }
        });

        return convertView;
    }

    private void refresh()
    {
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                movies.add(0,movies.get(new Random().nextInt(movies.size())));

                CustomAdapter.this.notifyDataSetChanged();

                swipe.setRefreshing(false);

            }
        },3000);
    }
}

SECTION 4 : Our Activity

MainActivity class.

Main Responsibility : LAUNCH OUR APP.

  • We shall reference the views like ListView and Floating action button here,from our XML Layouts.Also SwipeRefreshLayout.
  • We then generate our dataset and pass it to an instance of our adapter.
  • We set the adapter to our ListView.
package com.tutorials.hp.swiperefreshlistviewexample;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    ListView lv;
    CustomAdapter adapter;
    SwipeRefreshLayout swipe;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

        lv= (ListView) findViewById(R.id.lv);
        swipe= (SwipeRefreshLayout) findViewById(R.id.swiper);
        final ArrayList<Movie> movies=getMovies();
        adapter=new CustomAdapter(this,movies,swipe);

        lv.setAdapter(adapter);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, String.valueOf(movies.size()), Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });

    }

    private ArrayList<Movie> getMovies()
    {

        //COLECTION OF  MOVIES
        ArrayList<Movie> movies=new ArrayList<>();

        Movie movie=new Movie("Game Of Thrones",R.drawable.thrones);
        movies.add(movie);

        movie=new Movie("BlackList",R.drawable.red);
        movies.add(movie);

        movie=new Movie("Breaking Bad",R.drawable.breaking);
        movies.add(movie);

        movie=new Movie("Shuttle Carrier",R.drawable.shuttlecarrier);

        movies.add(movie);

        movie=new Movie("Fruits",R.drawable.fruits);
        movies.add(movie);

        movie=new Movie("Crisis",R.drawable.crisis);
        movies.add(movie);

        movie=new Movie("Ghost Rider",R.drawable.rider);
        movies.add(movie);

        movie=new Movie("Star Wars",R.drawable.starwars);
        movies.add(movie);

        movie=new Movie("Men In Black",R.drawable.meninblack);
        movies.add(movie);

        return movies;
    }
}

SECTION 5 : Our Layouts

ActivityMain.xml Layout.

  • Inflated as our activity’s view.
  • Contains xml specifications for Cordinator Layout,appbar layout,toolbar as well as floating action button.All these are contained in Design Support library.
  • Includes content main where we define our view hierarchy.
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 
    
    
    android_layout_width="match_parent"
    android_layout_height="match_parent"
    android_fitsSystemWindows="true"
    tools_context="com.tutorials.hp.swiperefreshlistviewexample.MainActivity">

    <android.support.design.widget.AppBarLayout
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        android_theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android_id="@+id/toolbar"
            android_layout_width="match_parent"
            android_layout_height="?attr/actionBarSize"
            android_background="?attr/colorPrimary"
            app_popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main" />

    <android.support.design.widget.FloatingActionButton
        android_id="@+id/fab"
        android_layout_width="wrap_content"
        android_layout_height="wrap_content"
        android_layout_gravity="bottom|end"
        android_layout_margin="@dimen/fab_margin"
        android_src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

ContentMain.xml Layout.

  • Defines our view hierarchy.
  • Wraps our AdapterView with SwipeRefreshLayout.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    
    
    android_layout_width="match_parent"
    android_layout_height="match_parent"
    android_paddingBottom="@dimen/activity_vertical_margin"
    android_paddingLeft="@dimen/activity_horizontal_margin"
    android_paddingRight="@dimen/activity_horizontal_margin"
    android_paddingTop="@dimen/activity_vertical_margin"
    app_layout_behavior="@string/appbar_scrolling_view_behavior"
    tools_context="com.tutorials.hp.swiperefreshlistviewexample.MainActivity"
    tools_showIn="@layout/activity_main">

    <android.support.v4.widget.SwipeRefreshLayout
        android_id="@+id/swiper"
        android_layout_width="match_parent"
        android_layout_height="wrap_content">

        <ListView
            android_id="@+id/lv"
            android_layout_width="match_parent"
            android_layout_height="match_parent"
            >
        </ListView>

    </android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>

Model.xml Layout.

  • Inflated as our AdapterView’s viewitems.
  • How our CardViews shall look.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 
    android_orientation="horizontal" android_layout_width="match_parent"
    
    android_layout_margin="10dp"
    card_view_cardCornerRadius="10dp"
    card_view_cardElevation="10dp"

    android_layout_height="wrap_content">

    <RelativeLayout
        android_layout_width="match_parent"
        android_layout_height="match_parent">

        <ImageView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_id="@+id/movieImage"
            android_padding="10dp"
            android_src="@drawable/ghost" />

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceLarge"
            android_text="Name"
            android_id="@+id/nameTxt"
            android_padding="10dp"
            android_textColor="@color/colorAccent"
            android_layout_below="@+id/movieImage"
            android_layout_alignParentLeft="true"
             />

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceLarge"
            android_text=" John Doe a former FBI Agent and now Physics teacher .is wrongly accussed of murdering an innocent child.He makes it his business to find the bad guys who did taht.He convinces hacker Aram to join him.....
            "
            android_id="@+id/descTxt"
            android_padding="10dp"
            android_layout_below="@+id/nameTxt"
            android_layout_alignParentLeft="true"
            />

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceMedium"
            android_text="TV Show"
            android_id="@+id/posTxt"
            android_padding="10dp"

            android_layout_below="@+id/movieImage"
            android_layout_alignParentRight="true" />

        <CheckBox
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_id="@+id/chk"
            android_layout_alignParentRight="true"
            />

    </RelativeLayout>
</android.support.v7.widget.CardView>

 

Example 2 – Android Swipe RefreshLayout with ListView

 

This is an android example to swipe to refresh a custom listview ith images and text.

Swipe to Refresh or Pull to Refresh is a very popular mechanism for refeshing data. It’s also more modern than say clicking a button or something.

A special layout called SwipeRefreshLayout allows this in a very easy manner.

2. Add Dependencies

Add dependencies in your app level build.gradle.

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.2.1'
    compile 'com.android.support:design:23.2.1'
    compile 'com.android.support:cardview-v7:23.2.1'

}

3. Create User Interface

User interfaces are typically created in android using XML layouts as opposed by direct java coding.

This is an example fo declarative programming.

Advantages of Using XML over Java
No. Advantage
1. Declarative creation of widgets and views allows us to use a declarative language XML which makes is easier.
2. It’s easily maintanable as the user interface is decoupled from your Java logic.
3. It’s easier to share or download code and safely test them before runtime.
4. You can use XML generated tools to generate XML

Here are our layouts for this project:

(a). activity_main.xml

  • This layout gets inflated to MainActivity user interface.
  • It includes the content_main.xml.

Here are some of the widgets, views and viewgroups that get employed”

No. View/ViewGroup Package Role
1. CordinatorLayout android.support.design.widget Super-powered framelayout that provides our application’s top level decoration and is also specifies interactions and behavioros of all it’s children.
2. AppBarLayout android.support.design.widget A LinearLayout child that arranges its children vertically and provides material design app bar concepts like scrolling gestures.
3. ToolBar <android.support.v7.widget A ViewGroup that can provide actionbar features yet still be used within application layouts.
4. FloatingActionButton android.support.design.widget An circular imageview floating above the UI that we can use as buttons.
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 
    
    
    android_layout_width="match_parent"
    android_layout_height="match_parent"
    android_fitsSystemWindows="true"
    tools_context="com.tutorials.hp.swiperefreshlistviewexample.MainActivity">

    <android.support.design.widget.AppBarLayout
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        android_theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android_id="@+id/toolbar"
            android_layout_width="match_parent"
            android_layout_height="?attr/actionBarSize"
            android_background="?attr/colorPrimary"
            app_popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main" />

    <android.support.design.widget.FloatingActionButton
        android_id="@+id/fab"
        android_layout_width="wrap_content"
        android_layout_height="wrap_content"
        android_layout_gravity="bottom|end"
        android_layout_margin="@dimen/fab_margin"
        android_src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

(b). content_main.xml

This layout gets included in your activity_main.xml.

We define a ListView inside a SwipeRefreshLayout inside here.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    
    
    android_layout_width="match_parent"
    android_layout_height="match_parent"
    android_paddingBottom="@dimen/activity_vertical_margin"
    android_paddingLeft="@dimen/activity_horizontal_margin"
    android_paddingRight="@dimen/activity_horizontal_margin"
    android_paddingTop="@dimen/activity_vertical_margin"
    app_layout_behavior="@string/appbar_scrolling_view_behavior"
    tools_context="com.tutorials.hp.swiperefreshlistviewexample.MainActivity"
    tools_showIn="@layout/activity_main">

    <android.support.v4.widget.SwipeRefreshLayout
        android_id="@+id/swiper"
        android_layout_width="match_parent"
        android_layout_height="wrap_content">

        <ListView
            android_id="@+id/lv"
            android_layout_width="match_parent"
            android_layout_height="match_parent"
            >
        </ListView>

    </android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>

(c). model.xml

Custom ListView row model:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 
    android_orientation="horizontal" android_layout_width="match_parent"
    
    android_layout_margin="10dp"
    card_view_cardCornerRadius="10dp"
    card_view_cardElevation="10dp"

    android_layout_height="wrap_content">

    <RelativeLayout
        android_layout_width="match_parent"
        android_layout_height="match_parent">

        <ImageView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_id="@+id/movieImage"
            android_padding="10dp"
            android_src="@drawable/ghost" />

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceLarge"
            android_text="Name"
            android_id="@+id/nameTxt"
            android_padding="10dp"
            android_textColor="@color/colorAccent"
            android_layout_below="@+id/movieImage"
            android_layout_alignParentLeft="true"
             />

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceLarge"
            android_text=" John Doe a former FBI Agent and now Physics teacher .is wrongly accussed of murdering an innocent child.He makes it his business to find the bad guys who did taht.He convinces hacker Aram to join him.....
            "
            android_id="@+id/descTxt"
            android_padding="10dp"
            android_layout_below="@+id/nameTxt"
            android_layout_alignParentLeft="true"
            />

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceMedium"
            android_text="TV Show"
            android_id="@+id/posTxt"
            android_padding="10dp"

            android_layout_below="@+id/movieImage"
            android_layout_alignParentRight="true" />

        <CheckBox
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_id="@+id/chk"
            android_layout_alignParentRight="true"
            />

    </RelativeLayout>
</android.support.v7.widget.CardView>

4. Java Classes

(a). Movie.java

Our data object.

package com.tutorials.hp.swiperefreshlistviewexample;

public class Movie {

    private String name;
    private int image;

    public Movie(String name, int image) {
        this.name = name;
        this.image = image;
    }

    public String getName() {
        return name;
    }

    public int getImage() {
        return image;
    }
}

(b). ItemClickListener.java

Our Item Click Listener interface.

package com.tutorials.hp.swiperefreshlistviewexample;

public interface ItemClickListener {

    void onItemClick();

}

(c). MyViewHolder.java

Our ListView ViewHolder class:

package com.tutorials.hp.swiperefreshlistviewexample;

import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

public class MyViewHolder implements View.OnClickListener {

    ImageView img;
    TextView nameTxt;
    ItemClickListener itemClickListener;

    public MyViewHolder(View v) {
        img= (ImageView) v.findViewById(R.id.movieImage);
        nameTxt= (TextView) v.findViewById(R.id.nameTxt);

        v.setOnClickListener(this);

    }

    public  void setItemClickListener(ItemClickListener ic)
    {
        this.itemClickListener=ic;
    }

    @Override
    public void onClick(View v) {
        this.itemClickListener.onItemClick();
    }
}

(d). CustomAdapter.java

Our BaseAdapter class.

package com.tutorials.hp.swiperefreshlistviewexample;

import android.content.Context;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Random;

public class CustomAdapter extends BaseAdapter {

    Context c;
    ArrayList<Movie> movies;
    SwipeRefreshLayout swipe;

    LayoutInflater inflater;

    public CustomAdapter(Context c, ArrayList<Movie> movies,SwipeRefreshLayout swipe) {
        this.c = c;
        this.movies = movies;
        this.swipe=swipe;
    }

    @Override
    public int getCount() {
        return movies.size();
    }

    @Override
    public Object getItem(int position) {
        return movies.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        if(inflater==null)
        {
            inflater= (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        if(convertView==null)
        {
            convertView=inflater.inflate(R.layout.model,parent,false);
        }

        MyViewHolder holder=new MyViewHolder(convertView);
        holder.nameTxt.setText(movies.get(position).getName());
        holder.img.setImageResource(movies.get(position).getImage());

        holder.setItemClickListener(new ItemClickListener() {
            @Override
            public void onItemClick() {
                Toast.makeText(c, movies.get(position).getName(), Toast.LENGTH_SHORT).show();
            }
        });

        swipe.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                refresh();
            }
        });

        return convertView;
    }

    private void refresh()
    {
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                movies.add(0,movies.get(new Random().nextInt(movies.size())));

                CustomAdapter.this.notifyDataSetChanged();

                swipe.setRefreshing(false);

            }
        },3000);
    }
}

MainActivity.java

Our MainAcrivity.

package com.tutorials.hp.swiperefreshlistviewexample;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    ListView lv;
    CustomAdapter adapter;
    SwipeRefreshLayout swipe;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

        lv= (ListView) findViewById(R.id.lv);
        swipe= (SwipeRefreshLayout) findViewById(R.id.swiper);
        final ArrayList<Movie> movies=getMovies();
        adapter=new CustomAdapter(this,movies,swipe);

        lv.setAdapter(adapter);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, String.valueOf(movies.size()), Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });

    }

    private ArrayList<Movie> getMovies()
    {

        //COLECTION OF  MOVIES
        ArrayList<Movie> movies=new ArrayList<>();

        Movie movie=new Movie("Game Of Thrones",R.drawable.thrones);
        movies.add(movie);

        movie=new Movie("BlackList",R.drawable.red);
        movies.add(movie);

        movie=new Movie("Breaking Bad",R.drawable.breaking);
        movies.add(movie);

        movie=new Movie("Shuttle Carrier",R.drawable.shuttlecarrier);

        movies.add(movie);

        movie=new Movie("Fruits",R.drawable.fruits);
        movies.add(movie);

        movie=new Movie("Crisis",R.drawable.crisis);
        movies.add(movie);

        movie=new Movie("Ghost Rider",R.drawable.rider);
        movies.add(movie);

        movie=new Movie("Star Wars",R.drawable.starwars);
        movies.add(movie);

        movie=new Movie("Men In Black",R.drawable.meninblack);
        movies.add(movie);

        return movies;

    }

}

 

Example 3 – Android SQLite – RecyclerView – CRUD then Swipe To Refresh Data

Android SQLite – RecyclerView – CRUD then Swipe To Refresh Data Tutorial.

This is an android sqlite refresh tutorial with recyclerview as our adapterview.Users will swipe the recyclerview or pull it down thus refreshing data stored in sqlite database.

However first see how to perform CRUD adding data to sqlite database. Then we retrieve the data and bind to a RecyclerView.

Then when the user can show up an an input dialog and add more data. Those data don’t get shown immediately.

He can then swipe down/ or pull down the RecyclerView to refresh the data.

We use the SwipeRefreshLayout to enable this swiping functionality.

In short this is what we do in this episode 10:

  1. INSERT data to SQLite database.
  2. SELECT data from our SQLite database.
  3. Reload/Refresh data from our SQLite database when the user swipes/pulls down our RecyclerView.

Project Demo

SwipeRefreshLayout was introduced in Android KitKat.

1. Create Basic Activity Project

First create an empty project in android studio.You can see how to do so here.

2. Add Dependencies

Lets add dependencies in our app level build.gradle:

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.3.0'
    compile 'com.android.support:design:23.3.0'
    compile 'com.android.support:cardview-v7:23.3.0'
}

3. Create User Interface

User interfaces are typically created in android using XML layouts as opposed by direct java coding.

Here are our layouts for this project:

(a). activity_main.xml
  • This layout gets inflated to MainActivity user interface.
  • It includes the content_main.xml.
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 
    
    
    android_layout_width="match_parent"
    android_layout_height="match_parent"
    android_fitsSystemWindows="true"
    tools_context="com.tutorials.hp.sqliteswipetorefresh.MainActivity">

    <android.support.design.widget.AppBarLayout
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        android_theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android_id="@+id/toolbar"
            android_layout_width="match_parent"
            android_layout_height="?attr/actionBarSize"
            android_background="?attr/colorPrimary"
            app_popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main" />

    <android.support.design.widget.FloatingActionButton
        android_id="@+id/fab"
        android_layout_width="wrap_content"
        android_layout_height="wrap_content"
        android_layout_gravity="bottom|end"
        android_layout_margin="@dimen/fab_margin"
        android_src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>
(b). content_main.xml

This layout gets included in your activity_main.xml.

We wrap our RecyclerView inside a SwipeRefreshLayout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    
    
    android_layout_width="match_parent"
    android_layout_height="match_parent"
    android_paddingBottom="@dimen/activity_vertical_margin"
    android_paddingLeft="@dimen/activity_horizontal_margin"
    android_paddingRight="@dimen/activity_horizontal_margin"
    android_paddingTop="@dimen/activity_vertical_margin"
    app_layout_behavior="@string/appbar_scrolling_view_behavior"
    tools_context="com.tutorials.hp.sqliteswipetorefresh.MainActivity"
    tools_showIn="@layout/activity_main">

    <android.support.v4.widget.SwipeRefreshLayout
        android_id="@+id/swiper"
        android_layout_width="match_parent"
        android_layout_height="wrap_content">

    <android.support.v7.widget.RecyclerView
        android_id="@+id/rv"
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        ></android.support.v7.widget.RecyclerView>

    </android.support.v4.widget.SwipeRefreshLayout>

</RelativeLayout>
(c). dialog_input.xml

This is the input dialog.

Users will enter data to SQLite database via this dialog.

<?xml version="1.0" encoding="utf-8"?>

    <android.support.v7.widget.CardView 
        android_orientation="horizontal" android_layout_width="500dp"
        
        android_layout_margin="1dp"
        card_view_cardCornerRadius="10dp"
        card_view_cardElevation="5dp"

        android_layout_height="match_parent">

    <LinearLayout
            android_layout_width="match_parent"
            android_orientation="vertical"
            android_layout_height="match_parent">

        <android.support.design.widget.TextInputLayout
            android_id="@+id/nameLayout"
            android_layout_width="match_parent"
            android_layout_height="wrap_content">

            <EditText
                android_id="@+id/nameEditTxt"
                android_layout_width="match_parent"
                android_layout_height="wrap_content"
                android_singleLine="true"
                android_hint= "Name" />
        </android.support.design.widget.TextInputLayout>

        <Button android_id="@+id/saveBtn"
            android_layout_width="fill_parent"
            android_layout_height="wrap_content"
            android_text="Save"
            android_clickable="true"
            android_background="@color/colorAccent"
            android_layout_marginTop="40dp"
            android_textColor="@android:color/white"/>
        <Button android_id="@+id/retrieveBtn"
            android_layout_width="fill_parent"
            android_layout_height="wrap_content"
            android_text="Retrieve"
            android_clickable="true"
            android_background="@color/colorAccent"
            android_layout_marginTop="40dp"
            android_textColor="@android:color/white"/>
</LinearLayout>
    </android.support.v7.widget.CardView>
(d). model.xml

This is our model layout.

The RecyclerView viewitems will get inflated from this template. This will happpen in our RecyclerView Adapter class.

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 
    android_orientation="horizontal" android_layout_width="match_parent"
    
    android_layout_margin="5dp"
    card_view_cardCornerRadius="10dp"
    card_view_cardElevation="5dp"
    android_layout_height="wrap_content">

    <RelativeLayout
        android_layout_width="match_parent"
        android_layout_height="match_parent">

        <TextView
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"
            android_textAppearance="?android:attr/textAppearanceLarge"
            android_text="Name"
            android_id="@+id/nameTxt"
            android_padding="10dp"
            android_layout_alignParentTop="true"
            />

    </RelativeLayout>
</android.support.v7.widget.CardView>

4. Java Classes

Here are our Java Classes:

Our Data Object

(a) Spacecraft.java

This is our model class. It models a single spacecraft.

It’s our POJO class.

package com.tutorials.hp.sqliteswipetorefresh.mDataObject;

public class SpaceCraft {

    String name;
    int id;

    public SpaceCraft() {
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }
}

Our SQLite Classes

(a) Constants.java

Our database constants.

Includes sqlite database name, table name, database version, table creation statement and table dropping statements as string constants.

package com.tutorials.hp.sqliteswipetorefresh.mDataBase;

public class Constants {
    //COLUMNS
    static final String ROW_ID="id";
    static final String NAME="name";

    //DB PROPS
    static final String DB_NAME="hh_DB";
    static final String TB_NAME="hh_TB";
    static final int DB_VERSION=1;

    //CREATE_TB
    static final String CREATE_TB="CREATE TABLE hh_TB(id INTEGER PRIMARY KEY AUTOINCREMENT,"
            + "name TEXT NOT NULL);";

    //DROP_TB
     static final String DROP_TB="DROP TABLE IF EXISTS "+TB_NAME;

}
(b) DBHelper.java

Our database helper class.

Creates sqlite database table and upgrades it.

package com.tutorials.hp.sqliteswipetorefresh.mDataBase;

import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DBHelper extends SQLiteOpenHelper {

    public DBHelper(Context context) {
        super(context, Constants.DB_NAME, null, Constants.DB_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        try
        {
            db.execSQL(Constants.CREATE_TB);
        }catch (SQLException e)
        {
            e.printStackTrace();
        }

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL(Constants.DROP_TB);
        onCreate(db);
    }
}
(c) DBAdapter.java

Our sqlite database adapter class.

Allows us perform our CRUD operations : opening database, inserting data, retrieving data, closing the database.

package com.tutorials.hp.sqliteswipetorefresh.mDataBase;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;

public class DBAdapter {

    Context c;
    SQLiteDatabase db;
    DBHelper helper;

    public DBAdapter(Context c) {
        this.c = c;
        helper=new DBHelper(c);
    }

    //OPEN DB
    public void openDB()
    {
        try
        {
            db=helper.getWritableDatabase();
        }catch (SQLException e)
        {
            e.printStackTrace();
        }
    }

    //CLOSING
    public void closeDB()
    {
        try
        {
            helper.close();

        }catch (SQLException e)
        {
            e.printStackTrace();
        }
    }

    //SAVE OR INSERTING
    public boolean add(String name)
    {
        try
        {
            ContentValues cv=new ContentValues();
            cv.put(Constants.NAME, name);

            db.insert(Constants.TB_NAME, Constants.ROW_ID, cv);

            return true;

        }catch (SQLException e)
        {
            e.printStackTrace();
        }

        return false;
    }

    //SELECT OR RETRIEVE
    public Cursor retrieve()
    {
        String[] columns={Constants.ROW_ID,Constants.NAME};

        return db.query(Constants.TB_NAME,columns,null,null,null,null,null);
    }
}

Our RecyclerView Classes

(a) MyHolder.java

Our RecyclerView ViewHolder class.

package com.tutorials.hp.sqliteswipetorefresh.mRecycler;

import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;

import com.tutorials.hp.sqliteswipetorefresh.R;

public class MyHolder extends RecyclerView.ViewHolder {

    TextView nameTxt;

    public MyHolder(View itemView) {
        super(itemView);

        this.nameTxt= (TextView) itemView.findViewById(R.id.nameTxt);
    }
}

########(b) MyAdapter.java
Our RecyclerView Adapter class.

package com.tutorials.hp.sqliteswipetorefresh.mRecycler;

import android.content.Context;
import android.database.Cursor;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.tutorials.hp.sqliteswipetorefresh.R;
import com.tutorials.hp.sqliteswipetorefresh.mDataBase.DBAdapter;
import com.tutorials.hp.sqliteswipetorefresh.mDataObject.SpaceCraft;

import java.util.ArrayList;

public class MyAdapter extends RecyclerView.Adapter<MyHolder> {

    Context c;
    ArrayList<SpaceCraft> spaceCrafts;
    SwipeRefreshLayout swipeRefreshLayout;

    public MyAdapter(Context c, ArrayList<SpaceCraft> spaceCrafts, SwipeRefreshLayout swipeRefreshLayout) {
        this.c = c;
        this.spaceCrafts = spaceCrafts;
        this.swipeRefreshLayout = swipeRefreshLayout;
    }

    @Override
    public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v= LayoutInflater.from(parent.getContext()).inflate(R.layout.model,parent,false);
        MyHolder holder=new MyHolder(v);
        return holder;
    }

    @Override
    public void onBindViewHolder(MyHolder holder, int position) {
        holder.nameTxt.setText(spaceCrafts.get(position).getName());

        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                getUpdates();
            }
        });

    }

    @Override
    public int getItemCount() {
        return spaceCrafts.size();
    }

    private void getUpdates()
    {
        spaceCrafts.clear();

        DBAdapter db=new DBAdapter(c);
        db.openDB();
        Cursor c=db.retrieve();

        while (c.moveToNext())
        {
            int id=c.getInt(0);
            String name=c.getString(1);

            SpaceCraft s=new SpaceCraft();
            s.setId(id);
            s.setName(name);

            spaceCrafts.add(s);
        }

        db.closeDB();

        swipeRefreshLayout.setRefreshing(false);
        this.notifyDataSetChanged();
    }
}

Our Activity class

(a) MainActivity.java

Our MainActivity class.
Will display our RecyclerView and show us a dialog for adding data to SQLite database.

package com.tutorials.hp.sqliteswipetorefresh;

import android.app.Dialog;
import android.database.Cursor;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.tutorials.hp.sqliteswipetorefresh.mDataBase.DBAdapter;
import com.tutorials.hp.sqliteswipetorefresh.mDataObject.SpaceCraft;
import com.tutorials.hp.sqliteswipetorefresh.mRecycler.MyAdapter;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    RecyclerView rv;
    MyAdapter adapter;
    SwipeRefreshLayout swipeRefreshLayout;
    EditText nameEditText;
    Button saveBtn,retrieveBtn;
    ArrayList<SpaceCraft> spaceCrafts=new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);

        rv= (RecyclerView) findViewById(R.id.rv);
        rv.setLayoutManager(new LinearLayoutManager(this));

        swipeRefreshLayout= (SwipeRefreshLayout) findViewById(R.id.swiper);

        adapter=new MyAdapter(this,spaceCrafts,swipeRefreshLayout);

        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                displayDialog();
            }
        });

    }

    private void displayDialog()
    {
        Dialog d=new Dialog(this);
        d.setTitle("Save To Database");
        d.setContentView(R.layout.dialog_layout);

        nameEditText= (EditText) d.findViewById(R.id.nameEditTxt);
        saveBtn= (Button) d.findViewById(R.id.saveBtn);
        retrieveBtn= (Button) d.findViewById(R.id.retrieveBtn);

        saveBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                save(nameEditText.getText().toString());

            }
        });
        retrieveBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                 getSpaceCrafts();
            }
        });

        d.show();
    }

    private void save(String name)
    {
        DBAdapter db=new DBAdapter(this);
        db.openDB();
        if(db.add(name))
        {
            nameEditText.setText("");
        }else {
            Toast.makeText(this,"Unable to save",Toast.LENGTH_SHORT).show();
        }

        db.closeDB();
    }

    private void getSpaceCrafts()
    {
        spaceCrafts.clear();

        DBAdapter db=new DBAdapter(this);
        db.openDB();
        Cursor c=db.retrieve();

        while (c.moveToNext())
        {
            int id=c.getInt(0);
            String name=c.getString(1);

            SpaceCraft s=new SpaceCraft();
            s.setId(id);
            s.setName(name);

            spaceCrafts.add(s);
        }

        db.closeDB();

        rv.setAdapter(adapter);
    }

}

Download

Download code below.

If you prefer more explanations or want to see the demo then the video tutorial is here.

No. Location Link
1. GitHub Direct Download)
2. GitHub Browse
3. YouTube Video Tutorial
4. YouTube Our YouTube Channel