Question

我正在尝试在Android屏幕上创建类似头部小部件的Facebook。我已经在清单中声明了权限ALERT_SYSTEM_WINDOW权限，但它仍然崩溃，有人可以帮助找出我的代码中的问题是什么吗？

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

        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

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

        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;

        //this code is for dragging the chat head
        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;
            }
        });
            windowManager.addView(chatHead, params);
    }

Answer 1

我找到了答案。当我使用API版本19时，我使用了WindowManager.LayoutParams.TYPE_TOAST,而不是WindowManager.LayoutParams.TYPE_PHONE,

android.view.WindowManager $ BadTokenException：无法添加窗口android.view.ViewRoot

1 个答案: