onMeasure

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onMeasure有三种MeasureSpec.EXACTLY,MeasureSpec.AT_MOST,MeasureSpec.UNSPECIFIED
可以理解为精确（如：200dp,match_parent），不超过最大值（wrap_content），未知的
最后调用setMeasuredDimension(width，height);来设置view的大小

<com.lyg.testdemo.TestView        android:layout_width="200dp"        android:layout_height="match_parent"/>

日志：E/TAG: EXACTLY

<com.lyg.testdemo.TestView        android:layout_width="wrap_content"        android:layout_height="match_parent"/>

日志：E/TAG: AT_MOST

    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)    {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        int widthSize=getWidthSize(widthMeasureSpec);        int heightSize=getHeightSize(heightMeasureSpec);        setMeasuredDimension(widthSize，heightSize);    }    private void getWidthSize(int widthMeasureSpec)    {        int mode = MeasureSpec.getMode(widthMeasureSpec);        switch (mode)        {            case MeasureSpec.EXACTLY:                Log.e("TAG", "EXACTLY");                break;            case MeasureSpec.AT_MOST:                Log.e("TAG", "AT_MOST");                break;            case MeasureSpec.UNSPECIFIED:                Log.e("TAG", "UNSPECIFIED");                break;            default:                break;        }    }    private void getHeightSize(int heightMeasureSpec)    {        int mode = MeasureSpec.getMode(heightMeasureSpec);        switch (mode)        {            case MeasureSpec.EXACTLY:                break;            case MeasureSpec.AT_MOST:                break;            case MeasureSpec.UNSPECIFIED:                break;            default:                break;        }    }

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