Android：获取View的宽高

通过如下方法获取宽高： 

int width = v.getMeasuredWidth();
int height = v.getMeasuredHeight();

一、重写Activity的onWindowFocusChanged方法（当view布局完成后会触发此方法）：

public void onWindowFocusChanged(boolean hasFocus){
    super.onWindowFocusChanged(hasFocus);
    int width = v.getMeasuredWidth();
    int height = v.getMeasuredHeight();
}

二、使用ViewTreeObserver（当view发生改变时触发）：

View v = ...;
v.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener(){
    @Override
    public void onGlobalLayout(){
        int vWidth = v.getMeasuredWidth();
        int vHeight = v.getMeasuredHeight();
        v.getViewTreeObserver().removeGlobalOnLayoutListener(this);
    }
});