Question

我正在尝试使用setScaleX找到我所缺少的内容。

    final ImageView iv = (ImageView) findViewById(R.id.imageView);
    ViewTreeObserver vto = iv.getViewTreeObserver();
    vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            // Start at 60
            Log.d("test", "Before"+String.valueOf(iv.getWidth()));
            iv.setScaleX((float) .5);
            // Still at 60 after scale
            Log.d("test", "After"+String.valueOf(iv.getWidth()));
        }

    });

我认为宽度会变成30.如何在缩放后获得宽度值？

Answer 1

你可以乘以scale x or y

来解决它

 final ImageView iv = (ImageView) findViewById(R.id.imageView);
    ViewTreeObserver vto = iv.getViewTreeObserver();
    vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            // Start at 60
            Log.d("test", "Before"+String.valueOf(iv.getWidth()* iv.getScaleX()));
            iv.setScaleX((float) .5);
            // Still at 60 after scale
            Log.d("test", "After"+String.valueOf(iv.getWidth()* iv.getScaleX()));
        }

    });

Answer 2

getWidth()返回宽度，然后转换应用于视图（setScaleX等等）。所以这是预期的。 getDrawingRect：

的文档暗示了这一点

 These bounds do not account for any transformation properties currently set on the view, 
 such as setScaleX(float) or setRotation(float).

getWidth在缩放后不返回不同的值

2 个答案: