「这是我参与11月更文挑战的第5天,活动详情查看:2021最后一次更文挑战」 在做Dialog突然发现一个奇怪的现象,就是在在定义的listview中有一个textview和一个switch,但是使用listview的时候,同一个switch的状态会不断的变化。
解决方法
方法一:
在listview外面套一层RelativeLayout,将listview高度设置为match_parent。
方法二:
在listview外面套一层 LinearLayout,将listview高度设置为0dp weight设为1
很显然高度设置为match_parent放在dialog不合适
我是在ListView中嵌套Switch开关,点击ListView条目来切换Switch的状态,用List来控制,所以要在getView()中加入
于是在adapter中进行打点发现 6个条目刷新了42次
3个条目刷新了21次
所以getView()一共调用了7次
这时候问题来了,调用了这么多次,到底要在哪一次加呢?
一个一个分析发现 6组数据
1组:0
2组: 25 = (7-3)×6+1
3组: 26 = (7-3)×6+2
4组: 27 = (7-3)×6+3
5组: 28 = (7-3)×6+4
6组: 29 = (7-3)×6+5
所以:7-3=4 是第4次。
方法三:
int List_Count = getCount();
int aa = List_Count * 4 + 1;
int_list_switch = new int[List_Count];
for (int i = 0; i < List_Count; i++) {
int_list_switch[i] = aa;
aa++;
}
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getView()中
//优化Switch控件
if (Optimize_getView == 0) {
list_switch.add(holder.sw_Clock);
}
if (Optimize_getView == int_list_switch[Optimize_getView_Assist]) {
list_switch.add(holder.sw_Clock);
Log.d("添加switch", "" + Optimize_getView);
if (list_switch.size() < getCount())
Optimize_getView_Assist++;
}
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不放图的一律当水贴处理
觉得还有什么更好的办法评论下方留意吧!
全部代码
class TalkAdapter extends BaseAdapter implements OnClickListener {
private Context mContext;
private List<Course> mData;
private List<Switch> list_switch;
private int[] int_list_switch;
private int Optimize_getView = 0;
private int Optimize_getView_Assist =0;
public HashMap<Integer, Boolean> Switch_isSelected= new HashMap<Integer, Boolean>();
public TalkAdapter(Context mContext, List<Course> mData) {
this.mData = mData;
this.mContext = mContext;
list_switch = new ArrayList<>();
list_switch.clear();
int List_Count = getCount();
int aa = List_Count * 4 + 1;
int bb = 1;
int_list_switch = new int[List_Count];
for (int i = 0; i < List_Count; i++) {
int_list_switch[i] = aa;
aa++;
}
// int_list_switch= new int[]{0,17,18,19,28,29};
if (MMkvListDate.isDataCapacity(SwitchStatus_KEY)) {
Switch_isSelected.clear();
Switch_isSelected = MMkvListDate.getIBHashMap(SwitchStatus_KEY);
} else {
for (int i = 0; i < getCount(); i++) {
Switch_isSelected.put(i, false);
}
}
}
public Switch getaSwitch(int position) {
// Toast.makeText(mContext,list_switch.size()+ "位置:"+position, Toast.LENGTH_SHORT).show();
return list_switch.get(position);
}
@Override
public int getCount() {
return mData.size();
}
@Override
public Object getItem(int position) {
return mData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
convertView = LayoutInflater.from(mContext).inflate(R.layout.course_alarmclock_tips_list_item, parent, false);
holder = new ViewHolder();
holder.tv_className = (TextView) convertView.findViewById(R.id.coursealarmclocktipslistitemTextView1);
holder.tv_classTime = (TextView) convertView.findViewById(R.id.coursealarmclocktipslistitemTextView2);
holder.sw_Clock = (Switch)convertView.findViewById(R.id.coursealarmclocktipslistitemSwitch1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
String CourseName =mData.get(position).getName();
String jc = LitepalCourseUtil.getJc(mData.get(position).getTime());
holder.tv_className.setText(CourseName);
holder.tv_classTime.setText(jc);
System.out.println("list_getView()" + position);
//优化Switch控件
if (Optimize_getView == 0) {
list_switch.add(holder.sw_Clock);
}
if (Optimize_getView == int_list_switch[Optimize_getView_Assist]) {
list_switch.add(holder.sw_Clock);
Log.d("添加switch", "" + Optimize_getView);
if (list_switch.size() < getCount())
Optimize_getView_Assist++;
}
Log.d("Log_test", "___" + Optimize_getView);
Optimize_getView++;
holder.sw_Clock.setChecked(Switch_isSelected.get(position));
// holder.sw_Clock.setChecked(Switch_isSelected.get(position)==null?false:true);
return convertView;
}
@Override
public void onClick(View p1) {
}
private class ViewHolder {
TextView tv_className;
TextView tv_classTime;
Switch sw_Clock;
}
}
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mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
Switch aSwitch=item_Adapter.getaSwitch(position);
if (aSwitch.isChecked()) {
aSwitch.setChecked(false);
//进行业务处理
} else {
aSwitch.setChecked(true);
//进行业务处理
}
Toast.makeText(getContext(), aSwitch.isChecked() + " 第" + position, Toast.LENGTH_SHORT).show();
}
});
}
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