In the app that I mentioned in my question no default behavior was overridden. That was my mistake, I took it in wrong way. The same functionality can be achieved using Handler. In my app I used a service which starts on click of a button. Inside the service,, I had used handler. Below, I am posting the code snippet.
public class DialerService extends Service {
ActivityManager am;
List<RunningAppProcessInfo> mAppProcessInfosList;
private Runnable myRunnable;
boolean threadDone = true;
Handler mHandler;
boolean isLockedAppRunning = false;
@Override
public IBinder onBind(Intent arg0) {
return null;
}
public void onCreate() {
am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
mAppProcessInfosList = new ArrayList<ActivityManager.RunningAppProcessInfo>();
mHandler = new Handler();
Log.v("Dialer Service", "onCreate called");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
myRunnable = new Runnable() {
@Override
public void run() {
isRestrictedAppRunning();
}
};
new Thread(new Runnable() {
public void run() {
while (threadDone) {
try {
mHandler.post(myRunnable);
} catch (Exception e) {
}
}
}
}).start();
return START_STICKY;
}
private void isRestrictedAppRunning() {
mAppProcessInfosList = am.getRunningAppProcesses();
for (int i = 0; i < mAppProcessInfosList.size(); i++) {
if (mAppProcessInfosList.get(i).processName
.equals("com.android.phone")
|| mAppProcessInfosList.get(i).processName
.equals("com.android.email")
|| mAppProcessInfosList.get(i).processName
.equals("com.android.mms")) {
isLockedAppRunning = true;
Intent dialogIntent = new Intent(getBaseContext(),
TestActivity.class);
dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getApplication().startActivity(dialogIntent);
}
}
}
@Override
public void onDestroy() {
super.onDestroy();
this.threadDone = false;
}
}
This code is from my dummy app. There are lot more conditions in actual app and still lots of things need to implemented. But, what I needed actually will work in this way.