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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

    When we implements an interface in a class, its abstract methods are implemented in the  class.Lets see the example. First we created an interface ApplicationInterface  ApplicationInterface .java public interface ApplicationInterface { public void activityStarted(); public void activityAborted(); public void activityStopped(); public void activityDone(); } public class MainActivity extends Activity implements ApplicationInterface { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } // these are the methods implemented using interface @Override public void activityStarted() { // TODO Auto-generated method stub } @Override public void activityAborted() { // TODO Auto-generated method stub } @Override public void activityStopped() { // TODO Auto-generated method stub } @Override public void activityDone() { // TODO Auto-generated method stub } }