自定义ListView的写法

public class MyListView extends ListView {

public MyListView(Context context) {  
    // TODO Auto-generated method stub  
    super(context);  
}  

public MyListView(Context context, AttributeSet attrs) {  
    // TODO Auto-generated method stub  
    super(context, attrs);  
}  

public MyListView(Context context, AttributeSet attrs, int defStyle) {  
    // TODO Auto-generated method stub  
    super(context, attrs, defStyle);  
}  

@Override  
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  
    // TODO Auto-generated method stub  
    //获取高度
    int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,  
            MeasureSpec.AT_MOST);  
    super.onMeasure(widthMeasureSpec, expandSpec);  
}  

}