??????有時候我們須要在Activity的時候獲取控件的寬和高來做一些操作，以下介紹三種獲取寬和高的方式：

1. onWindowFocusChanged

@Overridepublic void onWindowFocusChanged(boolean hasFocus){super.onWindowFocusChanged(hasFocus);if (hasFocus){int width = image.getMeasuredWidth();int height = image.getMeasuredHeight();Toast.makeText(MainActivity.this, "width = " + width + "---height = " + height, Toast.LENGTH_SHORT).show();}}

2. post方式

@Overrideprotected void onStart(){super.onStart();image.post(new Runnable(){@Overridepublic void run(){int width = image.getMeasuredWidth();int height = image.getMeasuredHeight();Toast.makeText(MainActivity.this, "onstart--width = " + width + "---height = " + height, Toast.LENGTH_SHORT).show();}});}

3. ViewTreeObserver

ViewTreeObserver observer = image.getViewTreeObserver();observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener(){@Overridepublic void onGlobalLayout(){image.getViewTreeObserver().removeGlobalOnLayoutListener(this);int width = image.getMeasuredWidth();int height = image.getMeasuredHeight();Toast.makeText(MainActivity.this, "onglobal--width = " + width + "---height = " + height, Toast.LENGTH_SHORT).show();}});

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備注：以上image是ImageView控件

ImageView image = (ImageView)findViewById(R.id.image);

總結

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