Question

我写了一个非常简单的视图组，扩展了LinearLayout，如下所示。

 @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {



        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        ViewParent viewParent  = getParent();
        if(viewParent instanceof RelativeLayout)
        {
            RelativeLayout parentLayout  = (RelativeLayout)viewParent;

            int widthSize = MeasureSpec.getSize(widthMeasureSpec);


            Log.d(Constants.TAG, "Parent height is " + parentLayout.getMeasuredHeight());
            Log.d(Constants.TAG, "Parent height is1 " + parentLayout.getHeight());
            int height = parentLayout.getMeasuredHeight();
//            getChildAt(0).measure(MeasureSpec.EXACTLY | AndroidUtilities.dp(70), MeasureSpec.EXACTLY | (int)(parentLayout.getMeasuredHeight()*0.6));
 //           getChildAt(1).measure(MeasureSpec.EXACTLY | AndroidUtilities.dp(70), MeasureSpec.EXACTLY | (int)(parentLayout.getMeasuredHeight()*0.4));

            getChildAt(0).measure(MeasureSpec.makeMeasureSpec(AndroidUtilities.dp(70), MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec((int)(height* 0.6), MeasureSpec.EXACTLY));
            getChildAt(1).measure(MeasureSpec.makeMeasureSpec(AndroidUtilities.dp(70), MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec((int)(height* 0.6), MeasureSpec.EXACTLY));


            setMeasuredDimension(widthSize, parentLayout.getMeasuredHeight());

        }

此视图组的父级是RelativeLayout，其中包含一个简单的TextView。

在Android 4.2.2上，parentLayout.getMeasuredHeight（）返回16777215.我无法理解这个数字。它适用于更高版本的Android版本。

有没有人遇到过这个？

Answer 1

我还没有看到这个，但是文档中有关于适合您情况的错误的说明：

http://developer.android.com/reference/android/view/View.MeasureSpec.html#makeMeasureSpec(int,%20int)

至于16777215（等于2 ^ 24 - 1），我不确定，但它似乎是一个非常大的巧合，它等于MEASURED_SIZE_MASK。参见

http://developer.android.com/reference/android/view/View.html#MEASURED_SIZE_MASK

getMeasuredHeight（）在Android 4.2.2上返回16777215

1 个答案: