Tutorial - Make Androidhive Apps

You can download GSON Library here.

Example :

Source JSON from http://api.androidhive.info/contacts/

Application Name : Androidhive
Project Name : Androidhive
Package Name : com.lesson.androidhive

There are have 3 model data :

For DownloadString.java, you can see here.

PhoneModel.java

package com.lesson.androidhive.models;
public class PhoneModel {
    public String mobile;
    public String home;
    public String office;
}

ContactModel.java

package com.lesson.androidhive.models;
public class ContactModel {
    public String id;
    public String name;
    public String email;
    public String address;
    public String gender;
    public PhoneModel phone;
}

ResponseModel.java

package com.lesson.androidhive.models;
public class ResponseModel {
     public List<ContactModel> contacts;
}

ValueString.java

package com.lesson.androidhive.controls;

public class ValueString {
    public static final String MAIN_URL = "http://api.androidhive.info/contacts/";
}

item_person.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="5dp"
    android:paddingBottom="5dp"
    android:background="#33FF0000"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/tv_id"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:ellipsize="end"
        android:maxLines="1"
        android:text="@string/example_id"
        android:textIsSelectable="false"
        android:textSize="12sp" />
   
    <TextView
        android:id="@+id/tv_name"
        android:layout_marginLeft="20dp"
        android:layout_below="@+id/tv_id"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:ellipsize="end"
        android:maxLines="1"
        android:text="@string/example_id"
        android:textIsSelectable="false"
        android:textSize="12sp" />
   
    <TextView
        android:id="@+id/tv_email"
        android:layout_marginLeft="20dp"
        android:layout_below="@+id/tv_name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:ellipsize="end"
        android:maxLines="1"
        android:text="@string/example_id"
        android:textIsSelectable="false"
        android:textSize="12sp" />

</RelativeLayout>


activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    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"
    tools:context=".MainActivity" >

    <ListView
        android:id="@+id/postListView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</RelativeLayout>


ContactAdapter.java 

package com.lesson.androidhive.adapters;

import java.util.List;
import com.lesson.androidhive.models.ContactModel;
import com.lesson.androidhive.R;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class ContactAdapter extends ArrayAdapter<ContactModel> {
    private Context _context;
    private int _resource;
    private List<ContactModel> _contacts;
    public ContactAdapter(Context context, int resource,
            List<ContactModel> contacts) {
        super(context, resource, contacts);
        _context = context;
        _resource = resource;
        _contacts = contacts;
    }
   
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        ContactHolder holder = null;

        if (row == null) {
            LayoutInflater inflater = LayoutInflater.from(_context);

            row = inflater.inflate(_resource, parent, false);
            holder = new ContactHolder(row);
            row.setTag(holder);
        } else {
            holder = (ContactHolder) row.getTag();
        }

        holder.populateFrom(_contacts.get(position));

        return (row);
    }

   
    public static class ContactHolder {
        private TextView _tvID;
        private TextView _tvName;
        private TextView _tvEmail;
       
        ContactHolder(View row)
        {
            _tvID = (TextView)row.findViewById(R.id.tv_id);
            _tvName = (TextView)row.findViewById(R.id.tv_name);
            _tvEmail = (TextView)row.findViewById(R.id.tv_email);
        }
       
        void populateFrom(ContactModel contact)
        {
            _tvID.setText(contact.id);
            _tvName.setText(contact.name);
            _tvEmail.setText(contact.email);
        }
    }
}

MainActivity.java

package com.lesson.androidhive;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.lesson.androidhive.adapters.ContactAdapter;
import com.lesson.androidhive.controls.ValueString;
import com.lesson.androidhive.models.ResponseModel;
import com.lesson.androidhive.util.DownloadString;
import com.lesson.androidhive.util.DownloadString.DownloadProperties;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ListView;

public class MainActivity extends Activity {

    private ContactAdapter _contactAdapter;
    private ListView _lvContact;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
      
        _lvContact = (ListView)findViewById(R.id.postListView);
      
        DownloadString downloadString = new DownloadString();
        downloadString.setListener(new DownloadProperties() {
         
            @Override
            public void OnStart() {
                // TODO Auto-generated method stub
            }
         
            @Override
            public void OnProgress(int progress) {
                // TODO Auto-generated method stub
            }
         
            @Override
            public void OnCompleted(String result) {
                OnCompletedDownload(result);
            }
        });
        downloadString.execute(ValueString.MAIN_URL);

    }
  
    private void OnCompletedDownload(String result)
    {
        GsonBuilder gsonBuilder = new GsonBuilder();
        gsonBuilder.setDateFormat("M/d/yy hh:mm a");
        Gson gson = gsonBuilder.create();
        ResponseModel contacts = gson.fromJson(result, ResponseModel.class);
        _contactAdapter = new ContactAdapter(getBaseContext(), R.layout.item_person, contacts.contacts);
        _lvContact.setAdapter(_contactAdapter);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

AndroidManifest.java

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.lesson.androidhive"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.lesson.androidhive.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>