Android GridView设置行数

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普通的做法是设置一个高度,然后里面能显示出来几行就是几行，如果里面的内容高度变了，就需要重新调整高度来适配。

观察了一下它的onMeasure

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {.....if (heightMode == MeasureSpec.AT_MOST) {
int ourSize = mListPadding.top + mListPadding.bottom;

final int numColumns = mNumColumns;
for (int i = ; i < count; i += numColumns) {
ourSize += childHeight;
if (i + numColumns < count) {
ourSize += mVerticalSpacing;
}
if (ourSize >= heightSize) {
ourSize = heightSize;
break;
}
}
heightSize = ourSize;
}
...}

发现，如果是它设置wrap_content，可以通过改变它的adapter来确定行数，具体方法如下是：

MyAdapter

@Override
public int getCount() {
if (mIsOnMeasure && super.getCount() >MAX_COUNT) {
return MAX_COUNT;
}
return super.getCount();
} public void setOnMeasureStatus(boolean isOnMeasure) {
mIsOnMeasure = isOnMeasure;
}Gridview- >@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
if (heightMode == MeasureSpec.AT_MOST) {
((MyAdapter) getAdapter()).setOnMeasureStatus(true);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int height = getMeasuredHeight();
((FolderAdapter) getAdapter()).setOnMeasureStatus(false);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
setMeasuredDimension(getMeasuredWidthAndState(),
MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
} else {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}