GridView调用notifyDataSetChanged后抢焦点的BUG(TV盒子开发)

来源：互联网发布：oracle数据库日志文件编辑：程序博客网时间：2024/05/22 04:32

前言：

 今天QA提了一个只会在android4.4出现的BUG，就花了点时间看了看，分享出来大一一起讨论学习。Android TV开发好多坑！！！一个网友查看资料得知这是android4.4系统的bug，谷歌挖的坑我们来补啊，在gridview和listview初始化数据时自动调用或者我们显示调用notifyDataSetChanged的时候第一个item会被选中并会抢焦点。android4.4在调用notifyDataSetChanged的时候注释掉了判断touchmode的代码，导致一调用notifyDataSetChanged就模拟用户点击了gridview。

我们继承gridview或者listview重写里面的isInTouchMode方法：

重写了getChildDrawingOrder，允许在listview或者gridview滚动后，其子控件重新排序。

1、重写GridView

package cn.longmaster.lmkit.widget;import android.content.Context;import android.os.Build;import android.util.AttributeSet;import android.widget.GridView;/** * Created by yzq on 2017/9/12 */public class CommonGridView extends GridView {    public CommonGridView(Context context) {        super(context);        setChildrenDrawingOrderEnabled(true);    }    public CommonGridView(Context context, AttributeSet attrs) {        super(context, attrs);        setChildrenDrawingOrderEnabled(true);    }    @Override    public boolean isInTouchMode() {        if (Build.VERSION.SDK_INT == 19) {            return !(hasFocus() && !super.isInTouchMode());        }        return super.isInTouchMode();    }    @Override    protected int getChildDrawingOrder(int childCount, int i) {        int position =  getSelectedItemPosition() - getFirstVisiblePosition();        if (position < 0) {            return i;        } else {            if (i == childCount - 1) {                if (position > i) {                    position = i;                }                return position;            }            if (i == position) {                return childCount - 1;            }        }        return i;    }}

2、重写ListView

package cn.longmaster.lmkit.widget;import android.content.Context;import android.os.Build;import android.util.AttributeSet;import android.widget.ListView;/** * Created by yzq on 2017/9/12 */public class CommonListView extends ListView {    public CommonListView(Context context) {        super(context);        setChildrenDrawingOrderEnabled(true);    }    public CommonListView(Context context, AttributeSet attrs) {        super(context, attrs);        setChildrenDrawingOrderEnabled(true);    }    @Override    public boolean isInTouchMode() {        if (Build.VERSION.SDK_INT == 19) {            return !(hasFocus() && !super.isInTouchMode());        }        return super.isInTouchMode();    }    @Override    protected int getChildDrawingOrder(int childCount, int i) {        int position = getSelectedItemPosition() - getFirstVisiblePosition();        if (position < 0) {            return i;        } else {            if (i == childCount - 1) {                if (position > i) {                    position = i;                }                return position;            }            if (i == position) {                return childCount - 1;            }        }        return i;    }}

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