Java 我正在为listview使用简单适配器,但在listview中滚动时,开关会更改其状态吗?
我使用了一个简单的适配器来显示列表,但在滚动listview时开关会更改其状态:Java 我正在为listview使用简单适配器,但在listview中滚动时,开关会更改其状态吗?,java,android,listview,Java,Android,Listview,我使用了一个简单的适配器来显示列表,但在滚动listview时开关会更改其状态: lv = (ListView) findViewById(R.id.listView); String[] from = {"CompanyName", "AppointmenTime", "Status"}; // view id's to which data to be binded int[] to = {R.id.clientname, R.id.time, R.id.togg
lv = (ListView) findViewById(R.id.listView);
String[] from = {"CompanyName", "AppointmenTime", "Status"};
// view id's to which data to be binded
int[] to = {R.id.clientname, R.id.time, R.id.togglebtn};
//Creating Adapter
android.widget.SimpleAdapter k = new android.widget.SimpleAdapter(ClientListActivity.this, clientData, R.layout.client_list, from, to) {
public View getView(int position, View convertView, ViewGroup parent) {
View v = super.getView(position, convertView, parent);
Switch switchcompact=(Switch) v.findViewById(R.id.togglebtn);
switchcompact.setTag(position);
switchcompact.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
{
////some code
}}
如果您正在滚动,列表项将被创建,如果它们不可见,将被销毁。因此,您必须保存交换机的状态:
private Map<Integer, Boolean> states = new Hashmap<>();
public View getView(final int position, View convertView, ViewGroup parent) {
View v = super.getView(position, convertView, parent);
Switch switchcompact = (Switch) v.findViewById(R.id.togglebtn);
switchcompact.setChecked(Boolean.TRUE.equals(states.get(position));
switchcompact.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
states.put(position, isChecked);
}
});
}
private Map states=new Hashmap();
公共视图getView(最终整数位置、视图转换视图、视图组父视图){
视图v=super.getView(位置、转换视图、父级);
Switch Switch compact=(开关)v.findviewbyd(R.id.togglebtn);
setChecked(Boolean.TRUE.equals(states.get(position));
setOnCheckedChangeListener(新的OnCheckedChangeListener(){
@凌驾
检查更改后的公共无效(CompoundButton CompoundButton,布尔值已检查){
状态。放置(位置,已检查);
}
});
}
但是,这只是伪代码。我强烈建议您使用
SharedReferences
保存并获取选择状态。如果您正在滚动,列表项将被创建并销毁,如果它们不可见。因此,您必须保存开关的状态:
private Map<Integer, Boolean> states = new Hashmap<>();
public View getView(final int position, View convertView, ViewGroup parent) {
View v = super.getView(position, convertView, parent);
Switch switchcompact = (Switch) v.findViewById(R.id.togglebtn);
switchcompact.setChecked(Boolean.TRUE.equals(states.get(position));
switchcompact.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
states.put(position, isChecked);
}
});
}
private Map states=new Hashmap();
公共视图getView(最终整数位置、视图转换视图、视图组父视图){
视图v=super.getView(位置、转换视图、父级);
Switch Switch compact=(开关)v.findviewbyd(R.id.togglebtn);
setChecked(Boolean.TRUE.equals(states.get(position));
setOnCheckedChangeListener(新的OnCheckedChangeListener(){
@凌驾
检查更改后的公共无效(CompoundButton CompoundButton,布尔值已检查){
状态。放置(位置,已检查);
}
});
}
但是,这只是伪代码。我强烈建议您使用
SharedReferences
保存并获取选择状态。切换状态更改后,您必须更新ArrayList(或提供给listview的数据集)中特定项的值
导入android.content.Context
导入android.view.LayoutInflater
导入android.view.view
导入android.view.ViewGroup
导入android.widget.BaseAdapter
导入android.widget.Switch
导入java.util.List
导入java.util.Map
公共类SimpleListViewAdapter扩展了BaseAdapter{
Context context;
List<Map<String, Object>> data;
public SimpleListViewAdaptor(Context context, List<Map<String, Object>> data) {
super();
this.context=context;
this.data=data;
}
@Override
public Map<String,Object> getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getCount() {
return data.size();
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
HolderView holderView;
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.customr_item_list,parent, false);
holderView = new HolderView();
holderView.aSwitch = (Switch) convertView.findViewById(R.id.togglebtn);
convertView.setTag(holderView);
} else {
// View recycled !
// no need to inflate
// no need to findViews by id
holderView = (HolderView) convertView.getTag();
}
holderView.aSwitch.setChecked((Boolean)data.get(position).get("Status"));
holderView.aSwitch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
if(((Switch)v).isChecked()){
((Switch)v).setChecked(true);
data.get(position).put("Status",true);//this is imp to update the value in dataset which is provided to listview
}else{
((Switch)v).setChecked(false);
data.get(position).put("Status",false);
}
}
});
return convertView;
}
static class HolderView{
Switch aSwitch;
}
语境;
列出数据;
公共SimpleListViewAdapter(上下文、列表数据){
超级();
this.context=context;
这个。数据=数据;
}
@凌驾
公共地图getItem(内部位置){
返回数据。获取(位置);
}
@凌驾
公共长getItemId(int位置){
返回位置;
}
@凌驾
public int getCount(){
返回data.size();
}
@凌驾
公共视图getView(最终整数位置、视图转换视图、视图组父视图){
HolderView HolderView;
if(convertView==null){
LayoutInflater mInflater=(LayoutInflater)context.getSystemService(context.LAYOUT\u INFLATER\u SERVICE);
convertView=mInflater.充气(R.layout.customr\u项目列表,父项,false);
holderView=新的holderView();
holderView.aSwitch=(开关)convertView.findViewById(R.id.togglebtn);
setTag(holderView);
}否则{
//查看回收!
//不需要充气
//不需要按id查找视图
holderView=(holderView)convertView.getTag();
}
holderView.aSwitch.setChecked((布尔)data.get(位置).get(“状态”);
holderView.aSwitch.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(最终视图v){
如果(((开关)v).isChecked()){
((开关)v).设置已检查(正确);
data.get(position).put(“Status”,true);//这是用来更新提供给listview的dataset中的值的imp
}否则{
((开关)v).设置检查(错误);
data.get(position).put(“Status”,false);
}
}
});
返回视图;
}
静态类保持视图{
开关;
}
}开关状态更改后,必须更新ArrayList(或提供给listview的数据集)中特定项的值 导入android.content.Context 导入android.view.LayoutInflater 导入android.view.view 导入android.view.ViewGroup 导入android.widget.BaseAdapter 导入android.widget.Switch 导入java.util.List 导入java.util.Map 公共类SimpleListViewAdapter扩展了BaseAdapter{
Context context;
List<Map<String, Object>> data;
public SimpleListViewAdaptor(Context context, List<Map<String, Object>> data) {
super();
this.context=context;
this.data=data;
}
@Override
public Map<String,Object> getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getCount() {
return data.size();
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
HolderView holderView;
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.customr_item_list,parent, false);
holderView = new HolderView();
holderView.aSwitch = (Switch) convertView.findViewById(R.id.togglebtn);
convertView.setTag(holderView);
} else {
// View recycled !
// no need to inflate
// no need to findViews by id
holderView = (HolderView) convertView.getTag();
}
holderView.aSwitch.setChecked((Boolean)data.get(position).get("Status"));
holderView.aSwitch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
if(((Switch)v).isChecked()){
((Switch)v).setChecked(true);
data.get(position).put("Status",true);//this is imp to update the value in dataset which is provided to listview
}else{
((Switch)v).setChecked(false);
data.get(position).put("Status",false);
}
}
});
return convertView;
}
static class HolderView{
Switch aSwitch;
}
语境;
列出数据;
公共SimpleListViewAdapter(上下文、列表数据){
超级();
this.context=context;
这个。数据=数据;
}
@凌驾
公共地图getItem(内部位置){
返回数据。获取(位置);
}
@凌驾
公共长getItemId(int位置){
返回位置;
}
@凌驾
public int getCount(){
返回data.size();
}
@凌驾
公共视图getView(最终整数位置、视图转换视图、视图组父视图){
HolderView HolderView;
if(convertView==null){
LayoutInflater mInflater=(LayoutInflater)context.getSystemService(context.LAYOUT\u INFLATER\u SERVICE);
convertView=mInflater.充气(R.layout.customr\u项目列表,父项,false);
holderView=新的holderView();
holderView.aSwitch=(开关)convertView.findViewById(R.id.togglebtn);
setTag(holderView);
}否则{
//查看回收!
//不需要充气
//不需要按id查找视图
holderView=(holderView)convertView.getTag();
}
holderView.aSwitch.setChecked((布尔)data.get(位置).get(“状态”);
holderView.aSwitch.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(最终视图v){
如果(((开关)v).isChecked()){
((开关)v).设置已检查(正确);
data.get(position).put(“Status”,true);//这是对u的imp