Android -- 获取View宽高

在activity中可以调用View.getWidth、View.getHeight()、View.getMeasuredWidth() 、View.getgetMeasuredHeight()来获得某个view的宽度或高度，但是在onCreate()、onStrart()、onResume()方法中会返回0，这是应为当前activity所代表的界面还没显示出来没有添加到WindowPhone的DecorView上或要获取的view没有被添加到DecorView上或者该View的visibility属性为gone 或者该view的width或height真的为0 ，所以只有上述条件都不成立时才能得到非0的width和height。

View的事件回调里使用

这时候该view已经被显示即被添加到DecorView上  如点击事件  触摸事件   焦点事件等

View view=findViewById(R.id.tv);
    view.setOnClickListener(new OnClickListener() {  

        @Override
        public void onClick(View v) {
            int width = v.getWidth();
        }
    });

onWindowFocusChanged() 回调

在activity被显示出来时即添加到了DecorView上时获取宽和高如onWindowFocusChanged() 回调方法

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    View iv1 = findViewById(R.id.iv1);
    View iv2=findViewById(R.id.iv2);
    String msg1="iv1' width:"+iv1.getWidth()+" height:"+iv1.getHeight()+"      measuredWidth:"+iv1.getMeasuredWidth()+"measuredHeight:"+iv1.getMeasuredHeight();
    String msg2="iv2' width:"+iv2.getWidth()+" height:"+iv2.getHeight()+"      measuredWidth:"+iv2.getMeasuredWidth()+"measuredHeight:"+iv2.getMeasuredHeight();
    Log.i("onWindowFocusChanged() "+msg1);
    Log.i("onWindowFocusChanged() "+msg2);
    super.onWindowFocusChanged(hasFocus);
}

延时

在onResume方法最后开线程300毫秒左右后获取宽和高   因为onResume执行完后300毫秒后，界面就显示出来了。

view.postDelayed(new Runnable() {  

            @Override
            public void run() {
                View iv1 = findViewById(R.id.iv1);
                View iv2=findViewById(R.id.iv2);
                String msg1="iv1' width:"+iv1.getWidth()+" height:"+iv1.getHeight()+"  measuredWidth:"+iv1.getMeasuredWidth()+"measuredHeight:"+iv1.getMeasuredHeight();
                String msg2="iv2' width:"+iv2.getWidth()+" height:"+iv2.getHeight()+"  measuredWidth:"+iv2.getMeasuredWidth()+"measuredHeight:"+iv2.getMeasuredHeight();
                Log.i("onWindowFocusChanged() "+msg1);
                Log.i("onWindowFocusChanged() "+msg2);
            }
        }, 300);

在onCreate()或onResume()等方法中需要

getViewTreeObserver().addOnGlobalLayoutListener()来添为view加回调在回调里获得宽度或者高度获取完后让view删除该回调

view.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {  

        @Override
        public void onGlobalLayout() {
            view.postDelayed(new Runnable() {  

                @Override
                public void run() {
                    View iv1 = findViewById(R.id.iv1);
                    View iv2=findViewById(R.id.iv2);
                    String msg1="iv1' width:"+iv1.getWidth()+" height:"+iv1.getHeight()+"  measuredWidth:"+iv1.getMeasuredWidth()+"measuredHeight:"+iv1.getMeasuredHeight();
                    String msg2="iv2' width:"+iv2.getWidth()+" height:"+iv2.getHeight()+"  measuredWidth:"+iv2.getMeasuredWidth()+"measuredHeight:"+iv2.getMeasuredHeight();
                    Log.i("onWindowFocusChanged() "+msg1);
                    Log.i("onWindowFocusChanged() "+msg2);
                }
            }, 300);
        }
    });

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参考：http://blog.csdn.net/nailsoul/article/details/25909313