重写 listview的重写Onmeasure
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//给listview最大的高度
heightMeasureSpec=MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE>>2, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}