Facebook chat heads in android application.

ChatHeadService.java

// I forked this code from- http://www.piwai.info/chatheads-basics/
// Chat head is displayed from a service. 
// uses a permission: 	<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
// This is a service so it needs to be declared in manifest: 		<service android:name=".ChatHeadService" />
// Whenever you need to display the chat head, just start the service
// example: startService(new Intent(context, ChatHeadService.class));

public class ChatHeadService extends Service {

	private WindowManager windowManager;
	private ImageView chatHead;

	@Override
	public IBinder onBind(Intent intent) {
		// Not used
		return null;
	}

	@Override
	public void onCreate() {
		super.onCreate();

		windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

		chatHead = new ImageView(this);
		chatHead.setImageResource(R.drawable.ic_launcher);

		final WindowManager.LayoutParams params = new WindowManager.LayoutParams(
				WindowManager.LayoutParams.WRAP_CONTENT,
				WindowManager.LayoutParams.WRAP_CONTENT,
				WindowManager.LayoutParams.TYPE_PHONE,
				WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
				PixelFormat.TRANSLUCENT);

		params.gravity = Gravity.TOP | Gravity.LEFT;
		params.x = 0;
		params.y = 100;

		windowManager.addView(chatHead, params);

		chatHead.setOnLongClickListener(new OnLongClickListener() {

			@Override
			public boolean onLongClick(View v) {
				windowManager.removeView(chatHead);
				return true;
			}
		});

		//
		// chatHead.setOnTouchListener(new View.OnTouchListener() {
		// private int initialX;
		// private int initialY;
		// private float initialTouchX;
		// private float initialTouchY;
		//
		// @Override
		// public boolean onTouch(View v, MotionEvent event) {
		// switch (event.getAction()) {
		// case MotionEvent.ACTION_DOWN:
		// initialX = params.x;
		// initialY = params.y;
		// initialTouchX = event.getRawX();
		// initialTouchY = event.getRawY();
		// return true;
		// case MotionEvent.ACTION_UP:
		// return true;
		// case MotionEvent.ACTION_MOVE:
		// params.x = initialX
		// + (int) (event.getRawX() - initialTouchX);
		// params.y = initialY
		// + (int) (event.getRawY() - initialTouchY);
		// windowManager.updateViewLayout(chatHead, params);
		// return true;
		//
		// }
		// return false;
		// }

		// });

	}

	@Override
	public void onDestroy() {
		super.onDestroy();
		if (chatHead != null)
			windowManager.removeView(chatHead);
	}
}