Coderzworld

Preference Activity is a base class mainly used for setting order of preferences of an user.It is mainly used for creating setting page of an user.In this example I am just showing how to set Preferences. First create an Activity MainActivity.java Here on clicking preference example button a page will be opened to set the preferences. On clicking the show values we can see the see the values that we have set. MainActivity.java import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button btn = (Button) findViewById(R.id.btn_pref); Button btn1 = (Button) findViewById(R.id.btn_values); btn.setOnCli...

In Android we can communicate with server using HTTP request methods for getting some details from the server.We use RESTful service.Mainly we use two types of HTTP request HTTP GET(),HTTP POST() methods. In some case we have to give some values to the server for fetching some informations, then we use commonly HTTP POST() and if we simply want to request for some datas we use HTTP GET(). Lets see HTTP POST() method. public void getResponse(String a, String b) { HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost("URL"); //here write the url List < NameValuePair > nameValueList = new ArrayList < NameValuePair > (2); nameValueList.add(new BasicNameValuePair("keyword", a)); nameValueList.add(new BasicNameValuePair("keyword", b)); try { httppost.setEntity(new UrlEncodedFormEntity(nameValueList)); HttpResponse response = httpclient.execute(httppost); Log.i(...

Let's record a video :). Check the code snippet. First need to give necessary permissions. So add these permissions to AndroidManifest.xml   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />   <uses-permission android:name="android.permission.RECORD_AUDIO" /> MainActivity.java import java.io.File; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; import android.app.Activity; import android.content.Intent; import android.content.pm.PackageManager; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; public class MainActivity extends Activity implements OnClickListener { Button btn_record; pu...

Ever wonder how to drag and drop in android. Lets check how to drag and drop image in android. MainActivity.java package com.example.dragdrop; import android.app.Activity; import android.content.ClipData; import android.content.ClipDescription; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.os.Bundle; import android.util.Log; import android.view.DragEvent; import android.view.MotionEvent; import android.view.View; import android.view.View.DragShadowBuilder; import android.view.View.OnClickListener; import android.view.View.OnDragListener; import android.view.View.OnTouchListener; import android.widget.ImageView; import android.widget.SeekBar; import android.widget.ImageView.ScaleType; import android.widget.RelativeLayout; import android.widget.SeekBar.OnSeekBarChangeListener; public class MainActivity extends Activity { ImageView img_model, img_chain; private static final String IMAGEVI...

 We can call fragment as a sub activity. By using fragment navigation will more easier and in tabs layouts look cool.Let us see an example..... Here we have 2 fragment class Details, and Detail2. MainActivity.java import android.app.Activity; import android.app.Fragment; import android.app.FragmentTransaction; import android.os.Bundle; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //Here we call the first fragment Fragment fragment = null; fragment = new Options(); FragmentTransaction fragmentTransaction = getFragmentManager() .beginTransaction(); fragmentTransaction.replace(R.id.frame1, fragment).commit(); } } Options.java import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.os.Bundle; import android.view.LayoutInflater; import android.view....

For getting the list of all running apps installed in the device and to show it on a listview we can use the following code: MainActivity.java import java.util.ArrayList; import java.util.List; import android.app.ActivityManager; import android.app.ActivityManager.RunningAppProcessInfo; import android.content.Intent; import android.content.pm.ApplicationInfo; import android.content.pm.PackageManager; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; import android.widget.ArrayAdapter; import android.widget.ListView; public class MainActivity extends ActionBarActivity { ArrayList results_sys_app = new ArrayList(); //ArrayAdapter<ApplicationInfo> adapter; ArrayAdapter<ApplicationInfo> adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); /*final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); mainIntent.addCategory(Intent.CA...

For getting the list of all apps installed in the device and to show it on a listview we can use the following code: MainActivity.java import java.util.ArrayList; import java.util.List; import android.content.Intent; import android.content.pm.ApplicationInfo; import android.content.pm.PackageManager; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; import android.widget.ArrayAdapter; import android.widget.ListView; public class MainActivity extends ActionBarActivity { ArrayList results_sys_app = new ArrayList(); ArrayAdapter<applicationinfo>adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); mainIntent.addCategory(Intent.CATEGORY_LAUNCHER); final List<applicationinfo> pkgAppsList = this.getPackageManager().getInstalledApplications( PackageManager.GET_UNINSTALLED_PAC...