android擷取view寬高的幾種方法

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在onCreate方法中我們通過mView.getWidth()和mView.getHeight()擷取到的view的寬高都是0，那麼下面幾種方法就可以在onCreate方法中擷取到view的寬高。

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());        }    }

列印結果：