Android ListView → Android ListView – CRUD – ADD UPDATE DELETE. – Camposha

Android ListView

Android ListView

Android ListView

Android ListView – CRUD – ADD UPDATE DELETE.

 

Hello.We see how to perform basic CRUD operations against an arraylist and a ListView.

  • Add Update and Delete against an ArrayList and a ListView.
  • We work with ArrayAdapter.
  • handle ItemClicks and input data from a dialog.
Android ListView CRUD

 

1. Build.Gradle App Level

  • Add dependencies for AppCompat and Design support libraries.
  • Our MainActivity shall derive from AppCompatActivity while we shall also use Floating action button from design support libraries.
apply plugin: 'com.android.application'

android {
    compileSdkVersion 24
    buildToolsVersion "24.0.1"

    defaultConfig {
        applicationId "com.tutorials.hp.listview_crud"
        minSdkVersion 15
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:24.1.1'
    compile 'com.android.support:design:24.1.1'
}

2. CRUD.java

  • Add Update Delete data.
package com.tutorials.hp.listview_crud;

import java.util.ArrayList;

public class CRUD {

    private ArrayList<String> names =new ArrayList<>();

    public void save(String name)
    {
       names.add(name);
    }

    public ArrayList<String> getNames()
    {

        return names;
    }

    public Boolean update(int position,String newName)
    {
       try {
           names.remove(position);
           names.add(position,newName);

           return true;
       }catch (Exception e)
       {
           e.printStackTrace();
          return false;
        }
    }

    public Boolean delete(int position)
    {
        try {
            names.remove(position);

            return true;
        }catch (Exception e)
        {
            e.printStackTrace();
            return false;

        }
    }
}

3. MainActivity.java

  • Launcher activity.
  • ActivityMain.xml inflated as the contentview for this activity.
  • Reference our ListView.
package com.tutorials.hp.listview_crud;
import android.app.Dialog;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
ListView lv;
ArrayAdapter<String> adapter;
CRUD crud=new CRUD();
Dialog d;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
lv= (ListView) findViewById(R.id.lv);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
if(d != null) {
if(!d.isShowing())
{
displayInputDialog(i);
}else
{
d.dismiss();
}
}
}
});
final FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
displayInputDialog(-1);
}
});
}
private void displayInputDialog(final int pos)
{
d=new Dialog(this);
d.setTitle("LISTVIEW CRUD");
d.setContentView(R.layout.input_dialog);
final EditText nameEditTxt= (EditText) d.findViewById(R.id.nameEditText);
Button addBtn= (Button) d.findViewById(R.id.addBtn);
Button updateBtn= (Button) d.findViewById(R.id.updateBtn);
Button deleteBtn= (Button) d.findViewById(R.id.deleteBtn);
if(pos== -1)
{
addBtn.setEnabled(true);
updateBtn.setEnabled(false);
deleteBtn.setEnabled(false);
}else
{
addBtn.setEnabled(true);
updateBtn.setEnabled(true);
deleteBtn.setEnabled(true);
nameEditTxt.setText(crud.getNames().get(pos));
}
addBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//GET DATA
String name=nameEditTxt.getText().toString();
//VALIDATE
if(name.length()>0 && name != null)
{
//save
crud.save(name);
nameEditTxt.setText("");
adapter=new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,crud.getNames());
lv.setAdapter(adapter);
}else
{
Toast.makeText(MainActivity.this, "Name cannot be empty", Toast.LENGTH_SHORT).show();
}
}
});
updateBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//GET DATA
String newName=nameEditTxt.getText().toString();
//VALIDATE
if(newName.length()>0 && newName != null)
{
//save
if(crud.update(pos,newName))
{
nameEditTxt.setText(newName);
adapter=new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,crud.getNames());
lv.setAdapter(adapter);
}
}else
{
Toast.makeText(MainActivity.this, "Name cannot be empty", Toast.LENGTH_SHORT).show();
}
}
});
deleteBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//DELETE
if( crud.delete(pos))
{
nameEditTxt.setText("");
adapter=new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,crud.getNames());
lv.setAdapter(adapter);
}
}
});
d.show();
}
}

4. ActivityMain.xml

  • To contain our ContentMain.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.listview_crud.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>

5. ContentMain.xml

  • To hold our ListView.
<?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.listview_crud.MainActivity"
tools_showIn="@layout/activity_main">
<ListView
android_id="@+id/lv"
android_layout_width="match_parent"
android_layout_height="wrap_content"
/>
</RelativeLayout>

6. inputdialog.xml

  • handles inputs.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
android_orientation="vertical" android_layout_width="match_parent"
android_layout_height="match_parent">
<LinearLayout
android_layout_width="fill_parent"
android_layout_height="match_parent"
android_layout_marginTop="?attr/actionBarSize"
android_orientation="vertical"
android_paddingLeft="15dp"
android_paddingRight="15dp"
android_paddingTop="10dp">
<android.support.design.widget.TextInputLayout
android_id="@+id/nameLayout"
android_layout_width="match_parent"
android_layout_height="wrap_content">
<EditText
android_id="@+id/nameEditText"
android_layout_width="match_parent"
android_layout_height="wrap_content"
android_singleLine="true"
android_hint= "Name" />
</android.support.design.widget.TextInputLayout>
<LinearLayout
android_orientation="horizontal"
android_layout_width="match_parent"
android_layout_height="wrap_content">
<Button android_id="@+id/addBtn"
android_layout_width="wrap_content"
android_layout_height="wrap_content"
android_text="ADD"
android_clickable="true"
android_background="@color/colorAccent"
android_layout_marginTop="20dp"
android_textColor="@android:color/white"/>
<Button android_id="@+id/updateBtn"
android_layout_width="wrap_content"
android_layout_height="wrap_content"
android_text="UPDATE"
android_clickable="true"
android_background="#009968"
android_layout_marginTop="20dp"
android_textColor="@android:color/white"/>
<Button android_id="@+id/deleteBtn"
android_layout_width="wrap_content"
android_layout_height="wrap_content"
android_text="DELETE"
android_clickable="true"
android_background="#2fc1b9"
android_layout_marginTop="20dp"
android_textColor="@android:color/white"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>

How To Run

  1. Download the project.
  2. You’ll get a zipped file,extract it.
  3. Open the Android Studio.
  4. Now close, already open project.
  5. From the Menu bar click on File >New> Import Project.
  6. Now Choose a Destination Folder, from where you want to import project.
  7. Choose an Android Project.
  8. Now Click on “OK“.
  9. Done, your done importing the project,now edit it.

More Resources

Resource Link
GitHub Browse Browse
GitHub Download Link Download

Good day.

(1) Comment

  • Paul July 9, 2019 @ 2:38 am

    Hi do you have a sql database code

    Reply

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