Android MySQL : Images Text – ListView Part 2 [Java Code]

Android MySQL : Images Text – ListView Part 2 [Java Code]







In this part we are going to write some java code.We prefer to break down our work into one class one responsibility so we may use many classes.

 

Quick Menu :

  1. Introduction
  2. Classes - Java Code.
  3. Layouts - XML Code.
  4. Server Side - PHP Code.

 

 

Classes

Classes

 

Section 1 : Build.Gradle

  • We are using Picasso library to load our images,so we need its dependency.
  • We are using CardViews within our custom ListView.
apply plugin: 'com.android.application'
android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"
    defaultConfig {
        applicationId "com.tutorials.hp.mysqllistviewimages"
        minSdkVersion 15
        targetSdkVersion 23
        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-v7:23.3.0'
    compile 'com.android.support:design:23.3.0'
    compile 'com.android.support:cardview-v7:23.3.0'
    //compile project(':picasso-2.5.2')
     compile 'com.squareup.picasso:picasso:2.5.2'
}

 

 

Section 2 : AndroidManifest.xml

  • Add Internet permission cause we are downloading the images via their urls from our mysql database via php code.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.tutorials.hp.mysqllistviewimages">
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

 

 

Section 3 :Data Object

  • Represents a singe data item,
package com.tutorials.hp.mysqllistviewimages.m_DataObject;
/**
 * Created by Oclemy on 6/5/2016 for ProgrammingWizards Channel and http://www.camposha.com.
 */
public class Spacecraft {
    int id;
    String name;
    String imageUrl;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getImageUrl() {
        return imageUrl;
    }
    public void setImageUrl(String imageUrl) {
        this.imageUrl = imageUrl;
    }
}

 

 

Section 4 : Connector Class

  • Responsible for connection to network.
  • We use HTTPUrlConnetion.
  • We are making a HTTP GET request to server,
package com.tutorials.hp.mysqllistviewimages.m_MySQL;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
/**
 * Created by Oclemy on 6/5/2016 for ProgrammingWizards Channel and http://www.camposha.com.
 */
public class Connector {
    public static HttpURLConnection connect(String urlAddress)
    {
        try {
            URL url=new URL(urlAddress);
            HttpURLConnection con= (HttpURLConnection) url.openConnection();
            //CON PROP
            con.setRequestMethod("GET");
            con.setConnectTimeout(20000);
            con.setReadTimeout(20000);
            con.setDoInput(true);
            return con;
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

 

 

Section 5 : Data Downloader Class

  • Downloads data in the background thread via asynctask.
  • Meanwhile we show a progress dialog
  • The data is then parsed to Data parser class to be parsed.
package com.tutorials.hp.mysqllistviewimages.m_MySQL;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.widget.ListView;
import android.widget.Toast;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
/**
 * Created by Oclemy on 6/5/2016 for ProgrammingWizards Channel and http://www.camposha.com.
 */
public class Downloader extends AsyncTask<Void,Void,String> {
    Context c;
    String urlAddress;
    ListView lv;
    ProgressDialog pd;
    public Downloader(Context c, String urlAddress, ListView lv) {
        this.c = c;
        this.urlAddress = urlAddress;
        this.lv = lv;
    }
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pd=new ProgressDialog(c);
        pd.setTitle("Retrieve");
        pd.setMessage("Retrieving...Please wait");
        pd.show();
    }
    @Override
    protected String doInBackground(Void... params) {
        return downloadData();
    }
    @Override
    protected void onPostExecute(String jsonData) {
    super.onPostExecute(jsonData);
        pd.dismiss();
        if(jsonData==null)
        {
            Toast.makeText(c,"Unsuccessful,No data Retrieved",Toast.LENGTH_SHORT).show();
        }else {
            //PARSE
            DataParser parser=new DataParser(c,jsonData,lv);
            parser.execute();
        }
    }
    private String downloadData()
    {
        HttpURLConnection con=Connector.connect(urlAddress);
        if(con==null)
        {
            return null;
        }
        try
        {
            InputStream is=new BufferedInputStream(con.getInputStream());
            BufferedReader br=new BufferedReader(new InputStreamReader(is));
            String line;
            StringBuffer jsonData=new StringBuffer();
            while ((line=br.readLine()) != null)
            {
                jsonData.append(line+"n");
            }
            br.close();
            is.close();
            return jsonData.toString();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

 

 

Section 6 : Data Parser Class

  • Parses our downloaded json data natively.
  • Then passes this data to CustomAdapter to be bound.
package com.tutorials.hp.mysqllistviewimages.m_MySQL;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.widget.ListView;
import android.widget.Toast;
import com.tutorials.hp.mysqllistviewimages.m_DataObject.Spacecraft;
import com.tutorials.hp.mysqllistviewimages.m_UI.CustomAdapter;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
/**
 * Created by Oclemy on 6/5/2016 for ProgrammingWizards Channel and http://www.camposha.com.
 */
public class DataParser extends AsyncTask<Void,Void,Integer> {
    Context c;
    String jsonData;
    ListView lv;
    ProgressDialog pd;
    ArrayList<Spacecraft> spacecrafts=new ArrayList<>();
    public DataParser(Context c, String jsonData, ListView lv) {
        this.c = c;
        this.jsonData = jsonData;
        this.lv = lv;
    }
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pd=new ProgressDialog(c);
        pd.setTitle("Parse");
        pd.setMessage("Parsing...Please wait");
        pd.show();
    }
    @Override
    protected Integer doInBackground(Void... params) {
        return this.parseData();
    }
    @Override
    protected void onPostExecute(Integer result) {
        super.onPostExecute(result);
        pd.dismiss();
        if(result==0)
        {
            Toast.makeText(c,"Unable To Parse",Toast.LENGTH_SHORT).show();
        }else {
            //BIND DATA TO LISTVIEW
            CustomAdapter adapter=new CustomAdapter(c,spacecrafts);
            lv.setAdapter(adapter);
        }
    }
    private int parseData()
    {
        try
        {
            JSONArray ja=new JSONArray(jsonData);
            JSONObject jo=null;
            spacecrafts.clear();
            Spacecraft spacecraft;
            for(int i=0;i<ja.length();i++)
            {
                jo=ja.getJSONObject(i);
                int id=jo.getInt("id");
                String name=jo.getString("name");
                String imageUrl=jo.getString("imageurl");
                spacecraft=new Spacecraft();
                spacecraft.setId(id);
                spacecraft.setName(name);
                spacecraft.setImageUrl(imageUrl);
                spacecrafts.add(spacecraft);
            }
            return 1;
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return 0;
    }
}

 

Section 7 : Picasso Client class

  • Uses Picasso ImageLoader to download our image into an imageview.
package com.tutorials.hp.mysqllistviewimages.m_UI;
import android.content.Context;
import android.widget.ImageView;
import com.squareup.picasso.Picasso;
import com.tutorials.hp.mysqllistviewimages.R;
/**
 * Created by Oclemy on 6/5/2016 for ProgrammingWizards Channel and http://www.camposha.com.
 */
public class PicassoClient {
    public static void downloadImage(Context c,String imageUrl,ImageView img)
    {
        if(imageUrl.length()>0 && imageUrl!=null)
        {
            Picasso.with(c).load(imageUrl).placeholder(R.drawable.placeholder).into(img);
        }else {
            Picasso.with(c).load(R.drawable.placeholder).into(img);
        }
    }
}

 

 

Section 8 : Custom Adapter class

  • Subclasses BaseAdapter.
  • Inflates our custom layout.
  • Binds our data into our adapterview.
package com.tutorials.hp.mysqllistviewimages.m_UI;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.tutorials.hp.mysqllistviewimages.R;
import com.tutorials.hp.mysqllistviewimages.m_DataObject.Spacecraft;
import java.util.ArrayList;
/**
 * Created by Oclemy on 6/5/2016 for ProgrammingWizards Channel and http://www.camposha.com.
 */
public class CustomAdapter extends BaseAdapter {
    Context c;
    ArrayList<Spacecraft> spacecrafts;
    LayoutInflater inflater;
    public CustomAdapter(Context c, ArrayList<Spacecraft> spacecrafts) {
        this.c = c;
        this.spacecrafts = spacecrafts;
        inflater= (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }
    @Override
    public int getCount() {
        return spacecrafts.size();
    }
    @Override
    public Object getItem(int position) {
        return spacecrafts.get(position);
    }
    @Override
    public long getItemId(int position) {
        return position;
    }
   @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if(convertView==null)
        {
            convertView=inflater.inflate(R.layout.model,parent,false);
        }
        TextView nametxt= (TextView) convertView.findViewById(R.id.nameTxt);
        ImageView img= (ImageView) convertView.findViewById(R.id.movieImage);
        //BIND DATA
        Spacecraft spacecraft=spacecrafts.get(position);
        nametxt.setText(spacecraft.getName());
        //IMG
        PicassoClient.downloadImage(c,spacecraft.getImageUrl(),img);
        return convertView;
    }
}

 

Section 9 : MainActivity

  • Launcher activity.
  • Executes our Downloader Asynctask class to start downloading on floating action button click.
package com.tutorials.hp.mysqllistviewimages;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.ListView;
import com.tutorials.hp.mysqllistviewimages.m_MySQL.Downloader;
public class MainActivity extends AppCompatActivity {
    final static String urlAddress="http://10.0.2.2/android/spacecraft_select_images.php";
    @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);
        final ListView lv= (ListView) findViewById(R.id.lv);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                new Downloader(MainActivity.this,urlAddress,lv).execute();
            }
        });
    }
}

 

 

Quick Menu :

  1. Introduction
  2. Classes - Java Code.
  3. Layouts - XML Code.
  4. Server Side - PHP Code.



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