Android ChatHead Service

gistfile1.txt

public class ChatHeadService extends Service {

    private WindowManager windowManager;
    private List<View> chatHeads;
    private LayoutInflater inflater;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        inflater = LayoutInflater.from(this);
        chatHeads = new ArrayList<View>();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        final View chatHead = inflater.inflate(R.layout.service_chat_head, null);

        TextView txt_title = (TextView) chatHead.findViewById(R.id.txt_title);
        TextView txt_text = (TextView) chatHead.findViewById(R.id.txt_text);

        txt_title.setText(intent.getStringExtra("title"));
        txt_text.setText(intent.getStringExtra("text"));

        chatHead.findViewById(R.id.btn_dismiss).setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                windowManager.removeView(chatHead);
            }
        });

        final WindowManager.LayoutParams params = new WindowManager.LayoutParams(WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_PHONE, 0, PixelFormat.TRANSLUCENT);

        params.gravity = Gravity.CENTER;

        chatHead.findViewById(R.id.txt_title).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;
            }
        });

        addChatHead(chatHead, params);

        return super.onStartCommand(intent, flags, startId);
    }

    public void addChatHead(View chatHead, LayoutParams params) {
        chatHeads.add(chatHead);
        windowManager.addView(chatHead, params);
    }

    public void removeChatHead(View chatHead) {
        chatHeads.remove(chatHead);
        windowManager.removeView(chatHead);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        for (View chatHead : chatHeads) {
            removeChatHead(chatHead);
        }
    }
}