android获取view宽高的几种方法 - ysl_longer

时间 2014-08-20 15:30:00  博客园-所有随笔区

原文  http://www.cnblogs.com/yushilong/p/3924741.html

主题 安卓开发

在onCreate方法中我们通过mView.getWidth()和mView.getHeight()获取到的view的宽高都是0，那么下面几种方法就可以在onCreate方法中获取到view的宽高。

1、

int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);  int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);  mTextView.measure(w, h);  int height = mTextView.getMeasuredHeight();  int width = mTextView.getMeasuredWidth();  System.out.println("measure width=" + width + " height=" + height);

2、mViewTreeObserver = mTextView.getViewTreeObserver();

mViewTreeObserver.addOnGlobalLayoutListener(new OnGlobalLayoutListener()    {      @Override      public void onGlobalLayout()      {        // TODO Auto-generated method stub        mTextView.getViewTreeObserver().removeGlobalOnLayoutListener(this);        System.out.println("onGlobalLayout width=" + mTextView.getWidth() + " height=" + mTextView.getHeight());      }    });

3、

mViewTreeObserver.addOnPreDrawListener(new OnPreDrawListener()    {      @Override      public boolean onPreDraw()      {        // TODO Auto-generated method stub        mTextView.getViewTreeObserver().removeOnPreDrawListener(this);        System.out.println("onPreDraw width=" + mTextView.getWidth() + " height=" + mTextView.getHeight());        return true;      }    });

4、

  @Override  public void onWindowFocusChanged(boolean hasFocus)  {    // TODO Auto-generated method stub    super.onWindowFocusChanged(hasFocus);    if (hasFocus)    {      System.out.println("onWindowFocusChanged width=" + mTextView.getWidth() + " height=" + mTextView.getHeight());    }  }