Android Java Initialize Overlay

public static void initHeadOverlay(Context c) {
        try {
            if (headoverlay_mHeadView != null) {
                headoverlay_mHeadView.setVisibility(View.GONE);
                headoverlay_mHeadView = null;
            }
            headoverlay_mHeadView = LayoutInflater.from(c).inflate(R.layout.head_layout, null);
            final WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                    PixelFormat.TRANSLUCENT);
            params.gravity = Gravity.CENTER;
            params.x = 0;
            params.y = 700;
            headoverlay_mWindowManager = (WindowManager) c.getSystemService(WINDOW_SERVICE);
            headoverlay_mWindowManager.addView(headoverlay_mHeadView, params);

            headoverlay_lay_txt1 = headoverlay_mHeadView.findViewById(R.id.laytext);
            headoverlay_lay_txt2 = headoverlay_mHeadView.findViewById(R.id.laytext2);
            headoverlay_lay_btn1 = headoverlay_mHeadView.findViewById(R.id.lay_btn1);
            headoverlay_lay_btn2 = headoverlay_mHeadView.findViewById(R.id.lay_btn2);
            bllistview = headoverlay_mHeadView.findViewById(R.id.bllist);

            headoverlay_lay_btn1.setText("Ping");
            headoverlay_lay_btn2.setText("Hide");
            headoverlay_lay_btn1.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    headoverlay_lay_txt1.setText(String.valueOf(System.currentTimeMillis()));
                }
            });
            headoverlay_lay_btn2.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    headoverlay_mHeadView.setVisibility(View.GONE);
                    headoverlay_mHeadView = null;
                }
            });

            headoverlay_lay_txt1.setText("SERVICE STARTED");
            headoverlay_lay_txt1.setOnTouchListener(new View.OnTouchListener() {
                private int lastAction;
                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();

                            lastAction = event.getAction();
                            return true;
                        case MotionEvent.ACTION_UP:
                            if (lastAction == MotionEvent.ACTION_DOWN) {
                                //OPEN MAIN ACTIVITY
                                Intent intent = new Intent(c, MainActivity.class);
                                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                                c.startActivity(intent);
                                //stopSelf();
                            }
                            lastAction = event.getAction();
                            return true;
                        case MotionEvent.ACTION_MOVE:
                            params.x = initialX + (int) (event.getRawX() - initialTouchX);
                            params.y = initialY + (int) (event.getRawY() - initialTouchY);

                            headoverlay_mWindowManager.updateViewLayout(headoverlay_mHeadView, params);
                            lastAction = event.getAction();
                            return true;
                    }
                    return false;
                }
            });
            headoverlay_lay_txt2.setVisibility(View.GONE);
            headoverlay_lay_txt2.setOnTouchListener(new View.OnTouchListener() {
                private int lastAction;
                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();

                            lastAction = event.getAction();
                            return true;
                        case MotionEvent.ACTION_UP:
                            if (lastAction == MotionEvent.ACTION_DOWN) {
                                //OPEN MAIN ACTIVITY
                                Intent intent = new Intent(c, MainActivity.class);
                                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                                c.startActivity(intent);
                                //stopSelf();
                            }
                            lastAction = event.getAction();
                            return true;
                        case MotionEvent.ACTION_MOVE:
                            params.x = initialX + (int) (event.getRawX() - initialTouchX);
                            params.y = initialY + (int) (event.getRawY() - initialTouchY);

                            headoverlay_mWindowManager.updateViewLayout(headoverlay_mHeadView, params);
                            lastAction = event.getAction();
                            return true;
                    }
                    return false;
                }
            });
        } catch (Exception e) {
            e.printStackTrace();
}