gistfile1.txt

    private WindowManager windowManager;
    private WindowManager.LayoutParams wmParams;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        view = findViewById(R.id.textView);
        windowManager = (WindowManager) getApplication().getSystemService(WINDOW_SERVICE);
        wmParams = new WindowManager.LayoutParams();
        wmParams.type = WindowManager.LayoutParams.TYPE_PHONE;
        wmParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        wmParams.format = PixelFormat.TRANSLUCENT;
        wmParams.gravity = Gravity.LEFT | Gravity.TOP;
        wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
        wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
        wmParams.y = 1000;
        wmParams.x = 300;
        Button button = new Button(this);
        windowManager.addView(button, wmParams);
        button.animate().scaleX(3f).setDuration(3000).start();
    }