Tag Archives: android

How to use Retrofit library

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Retrofit parse JSON of your web service. Use Retrofit library is very simple

Retrofit turns your REST API into a Java interface.

you can download this example from here

You need these librarires.

JSON

Then you can get your JSON, We use this chrome app. Now you can build your model from JSON in this web

You create a new class which name is RestClient

package com.thedeveloperworldisyours.simpleretrofic.webservice;

import retrofit.Callback;
import retrofit.RestAdapter;
import retrofit.RetrofitError;
import retrofit.client.OkClient;
import retrofit.client.Response;
import retrofit.http.GET;
import retrofit.http.Query;
import android.os.Handler;
import android.util.Log;

import com.squareup.okhttp.OkHttpClient;
import com.thedeveloperworldisyours.simpleretrofic.model.Question;
import com.thedeveloperworldisyours.simpleretrofic.utils.Constants;

public class RestClient {

	public interface ClientInterface{
		  @GET("/questions")
		  void getQuestions( @Query("sort") String sort, @Query("site") String site,@Query("pagesize") String pagesize,@Query("page") String page, Callback<Question> callback);
		}

	public static ClientInterface initRestAdapter()
    {
        OkHttpClient client = new OkHttpClient();

        return (ClientInterface) new RestAdapter.Builder()
                .setClient(new OkClient(client))
                .setEndpoint(Constants.URL)
                .build()
                .create(ClientInterface.class);
    }
	public static void GetQuestions(final Handler mHandler) {
		Callback<Question> callback = new Callback<Question>() {

			@Override
			public void failure(RetrofitError resp) {
				Log.v("failure", String.valueOf(resp.getMessage()));
			}

			@Override
			public void success(Question info, Response resp) {
				Log.v("success", String.valueOf(resp.getStatus()));
			}
		};
		RestClient.initRestAdapter().getQuestions(Constants.SORT, Constants.SITE,
				Constants.PAGESIZE, Constants.PAGE, callback);
	}

}

Now in your MainActivity put this:

package com.thedeveloperworldisyours.simpleretrofic;

import java.util.ArrayList;
import java.util.List;

import retrofit.Callback;
import retrofit.RetrofitError;
import retrofit.client.Response;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.HeaderViewListAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;

import com.thedeveloperworldisyours.simpleretrofic.model.Question;
import com.thedeveloperworldisyours.simpleretrofic.utils.Constants;
import com.thedeveloperworldisyours.simpleretrofic.utils.Utils;
import com.thedeveloperworldisyours.simpleretrofic.webservice.RestClient;

public class MainActivity extends ActionBarActivity {

	List<String> mListTitle = new ArrayList<String>();
	private ListView mListView;

		protected ListView getListView() {
		    if (mListView == null) {
		        mListView = (ListView) findViewById(android.R.id.list);
		    }
		    return mListView;
		}

		protected void setListAdapter(ListAdapter adapter) {
		    getListView().setAdapter(adapter);
		}

		protected ListAdapter getListAdapter() {
		    ListAdapter adapter = getListView().getAdapter();
		    if (adapter instanceof HeaderViewListAdapter) {
		        return ((HeaderViewListAdapter)adapter).getWrappedAdapter();
		    } else {
		        return adapter;
		    }
		}

	public void onCreate(Bundle icicle) {
		super.onCreate(icicle);
		setContentView(R.layout.activity_main);
		getQuestionCheckInternet();

	}

	@Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.main, menu);
        return true;
    }
	@Override
    public boolean onOptionsItemSelected(MenuItem item)
    {

        switch (item.getItemId())
        {
        case R.id.action_refresh:
        	refreshList();
        	if(Utils.isOnline(MainActivity.this)){
    			Toast.makeText(this, R.string.action_refresh, Toast.LENGTH_SHORT).show();
    		}
            return true;

        default:
            return super.onOptionsItemSelected(item);
        }
        }
	public void refreshList(){
		mListTitle.clear();
		getQuestionCheckInternet();
		createList();

	}

	public void getQuestionCheckInternet(){
		if(Utils.isOnline(MainActivity.this)){
			getQuestions();
		}else{
			Toast.makeText(this, R.string.info_offline, Toast.LENGTH_LONG).show();
		}
	}

	protected void onListItemClick(ListView lv, View v, int position, long id) {
	    getListView().getOnItemClickListener().onItemClick(lv, v, position, id);
	    String item = (String) getListAdapter().getItem(position);
		Toast.makeText(this, item, Toast.LENGTH_LONG).show();
	}

	public void getQuestions() {
		Callback<Question> callback = new Callback<Question>() {

			@Override
			public void failure(RetrofitError resp) {
				Log.v("failure", String.valueOf(resp.getMessage()));
			}

			@Override
			public void success(Question info, Response resp) {
				Log.v("success", String.valueOf(resp.getStatus()));
				getTitle(info);
	            createList();
			}
		};
		RestClient.initRestAdapter().getQuestions(Constants.SORT, Constants.SITE,
				Constants.PAGESIZE, Constants.PAGE, callback);
	}

	public List<String> getTitle(Question info) {
		for (int i = 0; i < info.getItems().size(); i++) {
			mListTitle.add(info.getItems().get(i).getTitle());
		}
		return mListTitle;
	}
	public void createList(){

		// use your custom layout
		ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
		        android.R.layout.simple_list_item_1,mListTitle);
		setListAdapter(adapter);
	}
}

you can download this example from here

How to put image in Navigation Drawer

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http://thedeveloperworldisyours.com/wp-content/uploads/putimagen.png

You can download it from here

When you put image in your navigation drawer you have to declare a layout, in this case relativeLayout.
In layout xml you declare a layout, now you put image inside layout, then you put listView.

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <!-- main content -->

    <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </FrameLayout>

    <!-- Menu -->

    <RelativeLayout
        android:id="@+id/left_drawer"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="@drawable/degradee"
        android:orientation="vertical" >

        <ImageView
            android:id="@+id/image_view"
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:background="@drawable/theworldisyours" />

        <ListView
            android:id="@+id/list_view_drawer"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_below="@id/image_view"
            android:choiceMode="singleChoice" />
    </RelativeLayout>

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

In your class you declare

package com.thedeveloperworldisyours.navigationdrawer;

import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.Toast;

import com.thedeveloperworldisyours.navigationdrawer.fragment.FirstFragment;
import com.thedeveloperworldisyours.navigationdrawer.fragment.SecondFragment;
import com.thedeveloperworldisyours.navigationdrawer.fragment.ThirdFragment;

public class MainActivity extends ActionBarActivity {

	private String[] mOptionMenu;
	private DrawerLayout mDrawerLayout;
	private RelativeLayout mDrawerRelativeLayout;
	private ListView mDrawerList;
	private ActionBarDrawerToggle mDrawerToggle;

	private CharSequence mTitleSection;
	private CharSequence mTitleApp;
	private Fragment mFragment = null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		mOptionMenu = new String[] { getString(R.string.first_fragment),
				getString(R.string.second_fragment),
				getString(R.string.third_fragment) };
		mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
		mDrawerRelativeLayout = (RelativeLayout) findViewById(R.id.left_drawer);
		mDrawerList = (ListView) findViewById(R.id.list_view_drawer);
		mDrawerList.setAdapter(new ArrayAdapter<String>(getSupportActionBar()
				.getThemedContext(), android.R.layout.simple_list_item_1,
				mOptionMenu));
		initContentWithFirstFragment();

		mDrawerList.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {

				switch (position) {
				case 0:
					mFragment = new FirstFragment();
					break;
				case 1:
					mFragment = new SecondFragment();
					break;
				case 2:
					mFragment = new ThirdFragment();
					break;
				}

				FragmentManager fragmentManager = getSupportFragmentManager();

				fragmentManager.beginTransaction()
						.replace(R.id.content_frame, mFragment).commit();

				mDrawerList.setItemChecked(position, true);

				mTitleSection = mOptionMenu[position];
				getSupportActionBar().setTitle(mTitleSection);

				mDrawerLayout.closeDrawer(mDrawerRelativeLayout);
			}
		});
		mDrawerList.setItemChecked(0, true);
		mTitleSection = getString(R.string.first_fragment);
		mTitleApp = getTitle();

		mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
				R.drawable.ic_drawer, R.string.drawer_open,
				R.string.drawer_close) {

			public void onDrawerClosed(View view) {
				getSupportActionBar().setTitle(mTitleSection);
				ActivityCompat.invalidateOptionsMenu(MainActivity.this);
			}

			public void onDrawerOpened(View drawerView) {
				getSupportActionBar().setTitle(R.string.app_name);
				ActivityCompat.invalidateOptionsMenu(MainActivity.this);
			}
		};

		mDrawerLayout.setDrawerListener(mDrawerToggle);

		getSupportActionBar().setDisplayHomeAsUpEnabled(true);
		getSupportActionBar().setHomeButtonEnabled(true);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {

		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {

		if (mDrawerToggle.onOptionsItemSelected(item)) {
			return true;
		}

		switch (item.getItemId()) {
		case R.id.action_settings:
			Toast.makeText(this, R.string.action_settings, Toast.LENGTH_SHORT)
					.show();
			;
			break;
		default:
			return super.onOptionsItemSelected(item);
		}

		return true;
	}

	@Override
	protected void onPostCreate(Bundle savedInstanceState) {
		super.onPostCreate(savedInstanceState);
		mDrawerToggle.syncState();
	}

	@Override
	public void onConfigurationChanged(Configuration newConfig) {
		super.onConfigurationChanged(newConfig);
		mDrawerToggle.onConfigurationChanged(newConfig);
	}

	public void initContentWithFirstFragment(){

		mTitleSection =getString(R.string.first_fragment);
		getSupportActionBar().setTitle(mTitleSection);
		mFragment = new FirstFragment();
		FragmentManager fragmentManager = getSupportFragmentManager();

		fragmentManager.beginTransaction()
				.replace(R.id.content_frame, mFragment).commit();
	}
}

You can download it from here

Multiple OnClickListener android

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You can do the onClick() method one time.

Download code.

First step

implements OnClickListener

Then you have a error
add unimplemented method

 @Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
        }

This is full code:

package com.thedeveloperworldisyours.multipleonclicklistener;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements OnClickListener {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		Button first = (Button) findViewById(R.id.activity_main_button_first);
		Button second = (Button) findViewById(R.id.activity_main_button_second);
		Button third = (Button) findViewById(R.id.activity_main_button_third);
		first.setOnClickListener(this);
		second.setOnClickListener(this);
		third.setOnClickListener(this);
	}

	@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;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.activity_main_button_first:
			Toast.makeText(MainActivity.this, R.string.activity_main_first,
					Toast.LENGTH_SHORT).show();
			break;
		case R.id.activity_main_button_second:
			Toast.makeText(MainActivity.this, R.string.activity_main_second,
					Toast.LENGTH_SHORT).show();
			break;
		case R.id.activity_main_button_third:
			Toast.makeText(MainActivity.this, R.string.activity_main_third,
					Toast.LENGTH_SHORT).show();
			break;
		default:
			break;
		}
	}
}

Multiple onClickListener

How to get coordinates of an address in android

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public class MapActivity extends android.support.v4.app.FragmentActivity{

	private static final int MAP_ZOOM = 15;
	private String mAddress;
	private GoogleMap mMap;
	private double mLongitude;
	private double mlatitude;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_map_hotel_car);

		Bundle extras = getIntent().getExtras();
		if (extras != null) {
			mAddress = extras.getString("Address");
		}
		mMap = ((SupportMapFragment) getSupportFragmentManager()
				.findFragmentById(R.id.map)).getMap();

		Log.v("ddd", mAddress);

		Geocoder geocoder = new Geocoder(this, Locale.getDefault());
                //To initialice list of address
		List<Address> addresses = null;
		try {
                        //To put the address in list
			addresses = geocoder.getFromLocationName(mAddress, 1);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
                //Get Latitude and longitude
		Address address = addresses.get(0);
		mLongitude = address.getLongitude();
		mlatitude = address.getLatitude();
		showMarker(mlatitude, mLongitude);
		centerMapOnMyLocation();

	}

	//show the poi in map
	private void showMarker(double lat, double lng)
	{
	    mMap.addMarker(new MarkerOptions()
	        .position(new LatLng(mlatitude, mLongitude))
	        .title("Pais: España"));
	}
	//Center the point in map
	private void centerMapOnMyLocation() {
			mMap.moveCamera(CameraUpdateFactory.newLatLng(getMyLatLng()));
			mMap.animateCamera(CameraUpdateFactory.zoomTo(MAP_ZOOM));
	}
	private LatLng getMyLatLng() {
		return new LatLng(mlatitude, mLongitude);
	}
}

Go to google maps app with a address

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The first step, you put the packaget for google maps

private String PACKAGET_MAPS="com.google.android.apps.maps";

The seconds step, you put query for to search the address.

private String HTTP_MAPS = "http://maps.google.com/maps?q=";

The third step, you put intent

if (Utils.isPackageInstalled(PACKAGET_MAPS, getApplicationContext())) {
StringBuilder stringBuilder = new StringBuilder();
//query of google maps
stringBuilder.append(HTTP_MAPS);
//String with your address
stringBuilder.append(separtorWithPlus("yourAddress"));
stringBuilder.append(",+");
//string of City
stringBuilder.append((separtorWithPlus("City")));
//intent with Uri which has query with address and city
intent = new Intent(android.content.Intent.ACTION_VIEW,
Uri.parse(stringBuilder.toString()));
startActivity(intent);
} else {
mShowMessage.showAlert(getResources().getString(
R.string.string_google_maps_uninstall));
}