Android 修改后的按钮在滚动列表视图上重置
我正在使用Json数据创建一个listview。我正在填充一些图像、文本字段和按钮。当用户单击按钮时,标题将更改 问题是,如果按钮被修改并且用户滚动,listview按钮将重置为第一个状态。请查看此视频,最好解释一下: 适配器Android 修改后的按钮在滚动列表视图上重置,android,listview,Android,Listview,我正在使用Json数据创建一个listview。我正在填充一些图像、文本字段和按钮。当用户单击按钮时,标题将更改 问题是,如果按钮被修改并且用户滚动,listview按钮将重置为第一个状态。请查看此视频,最好解释一下: 适配器 public class FilmRequestAdapter extends ArrayAdapter<FilmRequest>{ Context context; List<FilmRequest> data; pub
public class FilmRequestAdapter extends ArrayAdapter<FilmRequest>{
Context context;
List<FilmRequest> data;
public FilmRequestAdapter(Context context, int resource, List<FilmRequest> objects) {
super(context, resource, objects);
// TODO Auto-generated constructor stub
this.context=context;
this.data=objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row=convertView;
if (row==null) {
LayoutInflater inflater=((Activity)context).getLayoutInflater();
row=inflater.inflate(R.layout.film_request_list,null);
}
((TextView)row.findViewById(R.id.FilmRequestFilmTitle)).setText(((FilmRequest)data.get(position)).title);
((TextView)row.findViewById(R.id.FilmRequestRating)).setText("Imdb Puanı : "+((FilmRequest)data.get(position)).rating);
((TextView)row.findViewById(R.id.FilmRequestOrder)).setText("Sıra : "+((FilmRequest)data.get(position)).order);
((TextView)row.findViewById(R.id.FilmRequestVoteCount)).setText("Oya adeti : "+((FilmRequest)data.get(position)).voteCount);
Button button=(Button)row.findViewById(R.id.FilmRequestActionButton);
String status=((FilmRequest)data.get(position)).status;
boolean requested=((FilmRequest)data.get(position)).requested;
boolean voted=((FilmRequest)data.get(position)).voted;
if (status.equalsIgnoreCase("A") || status.equalsIgnoreCase("")) {
if (requested) {
if (voted) {
button.setText("Oylanmış");
button.setEnabled(false);
}else {
button.setText("+ Oyla");
button.setEnabled(true);
button.setTag(R.string.film_request_action, "VOTEABLE");
button.setTag(R.string.film_request_id,((FilmRequest)data.get(position)).id);
}
} else {
button.setText("Filmi İste");
button.setEnabled(true);
button.setTag(R.string.film_request_action, "REQUESTABLE");
button.setTag(R.string.film_request_id,((FilmRequest)data.get(position)).imdbId);
}
} else {
button.setText("Eklenmiş");
button.setEnabled(false);
}
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
FilmRequestActivity.ButtonClickFunction(context,(Button)v);
}
});
((ImageView)row.findViewById(R.id.FilmRequestPoster)).setImageBitmap(((FilmRequest)data.get(position)).bm);
return row;
}
}
您没有正确使用ViewHolder图案。您必须创建一个ViewHolder,并使用setTag和getTag来存储项目的状态:
if (convertView == null) {
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
问题是,在调用
按钮ClickFunction
时,您从未修改适配器的内容。这样,当您滚动时,将满足保持状态,并将旧字符串设置为您的按钮。我建议你更好地考虑你的设计。作为快速修复,您可以为按钮设置另一个标记,在位置添加FilmRequest对象,例如:
final FilmRequest filmRequest = (FilmRequest)data.get(position);
String status = filmRequest.status;
boolean requested = filmRequest.requested;
boolean voted = filmRequest.voted;
然后,在
按钮ClickFunction
中,检索此标记并相应地更改其状态
,我是同一个问题,但我通过此代码解决了
public class CustomizeListView extends ListActivity {
LayoutInflater inflater;
static int index = 0;
// AutoCompleteTextView autoCompleteTextView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_order);
inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, arrayList_Category);
dataAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
final CustomAdapter adapter = new CustomAdapter(this,
R.layout.activity_orderitem, arrayListItems);
setListAdapter(adapter);
}
private class CustomAdapter extends ArrayAdapter<HashMap<String, Object>>
implements OnItemSelectedListener {
boolean[] checkBoxState;
ViewHolder viewHolder;
public CustomAdapter(Context context, int textViewResourceId,
ArrayList<HashMap<String, Object>> arrayListItems) {
// let android do the initializing :)
super(context, textViewResourceId, arrayListItems);
checkBoxState = new boolean[arrayListItems.size()];
}
// class for caching the views in a row
private class ViewHolder {
CheckBox checkBox;
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
Log.d("getView", "getView");
if (convertView == null) {
convertView = inflater.inflate(R.layout.activity_orderitem,
null);
viewHolder = new ViewHolder();
// cache the views
convertView.setTag(viewHolder);
} else
viewHolder = (ViewHolder) convertView.getTag();
viewHolder.checkBox.setChecked(checkBoxState[position]);
viewHolder.checkBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (((CheckBox) v).isChecked()) {
checkBoxState[position] = true;
} else {
checkBoxState[position] = false;
}
}
});
return convertView;
}
}
}
public类CustomizeListView扩展了ListActivity{
充气机;
静态int指数=0;
//自动完成文本视图自动完成文本视图;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_order);
充气器=(LayoutInflater)getSystemService(Context.LAYOUT\u充气器\u SERVICE);
ArrayAdapter dataAdapter=新的ArrayAdapter(此,
android.R.layout.simple\u微调器\u项目,arrayList\u类别);
数据适配器
.setDropDownViewResource(android.R.layout.simple\u微调器\u下拉菜单\u项);
最终CustomAdapter=新CustomAdapter(此,
R.layout.activity_orderitem,arrayListItems);
setListAdapter(适配器);
}
私有类CustomAdapter扩展了ArrayAdapter
实现MSelectedListener{
布尔[]checkBoxState;
持票人持票人;
公共CustomAdapter(上下文上下文,int textViewResourceId,
ArrayList ArrayListEMS){
//让android进行初始化:)
super(上下文、textViewResourceId、arrayListItems);
checkBoxState=新布尔值[arrayListItems.size()];
}
//类以缓存行中的视图
私有类视窗持有者{
复选框;
}
@凌驾
公共视图getView(最终整型位置,视图转换视图,
视图组(父级){
Log.d(“getView”、“getView”);
if(convertView==null){
convertView=充气机。充气(R.layout.activity\u orderitem,
无效);
viewHolder=新的viewHolder();
//缓存视图
convertView.setTag(viewHolder);
}否则
viewHolder=(viewHolder)convertView.getTag();
viewHolder.checkBox.setChecked(checkBoxState[position]);
viewHolder.checkBox.setOnClickListener(新视图.OnClickListener(){
公共void onClick(视图v){
如果(((复选框)v).isChecked()){
checkBoxState[位置]=真;
}否则{
checkBoxState[位置]=假;
}
}
});
返回视图;
}
}
}
在我看来,您正在使用视图来存储其状态,因此当视图在滚动中循环时,原始元素将丢失状态,甚至可以将状态分配给获得循环视图的其他元素。
尝试将元素的状态存储在适配器的不同结构中,而不是存储在视图中。这是做什么的?:<代码>FilmRequestActivity.ButtonClickFunction(上下文,(按钮)v)代码>你能发布这个方法的代码吗?Vikram我已经更新了它。更好的方法是使用ButtonClickFunction更改数据并调用notifyDataSetChanged Sudar,但我认为我需要重新加载数据以调用notifyDataSetChanged。但我正在从网站加载数据。需要2-3秒。我不能让用户等待每次按钮的点击。我想我的问题不在于getTag和setTag。按钮自动填充。所以我不能用settag.Akram管理每个按钮,我认为他根本没有使用这个模式。
if (convertView == null) {
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
final FilmRequest filmRequest = (FilmRequest)data.get(position);
String status = filmRequest.status;
boolean requested = filmRequest.requested;
boolean voted = filmRequest.voted;
public class CustomizeListView extends ListActivity {
LayoutInflater inflater;
static int index = 0;
// AutoCompleteTextView autoCompleteTextView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_order);
inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, arrayList_Category);
dataAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
final CustomAdapter adapter = new CustomAdapter(this,
R.layout.activity_orderitem, arrayListItems);
setListAdapter(adapter);
}
private class CustomAdapter extends ArrayAdapter<HashMap<String, Object>>
implements OnItemSelectedListener {
boolean[] checkBoxState;
ViewHolder viewHolder;
public CustomAdapter(Context context, int textViewResourceId,
ArrayList<HashMap<String, Object>> arrayListItems) {
// let android do the initializing :)
super(context, textViewResourceId, arrayListItems);
checkBoxState = new boolean[arrayListItems.size()];
}
// class for caching the views in a row
private class ViewHolder {
CheckBox checkBox;
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
Log.d("getView", "getView");
if (convertView == null) {
convertView = inflater.inflate(R.layout.activity_orderitem,
null);
viewHolder = new ViewHolder();
// cache the views
convertView.setTag(viewHolder);
} else
viewHolder = (ViewHolder) convertView.getTag();
viewHolder.checkBox.setChecked(checkBoxState[position]);
viewHolder.checkBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (((CheckBox) v).isChecked()) {
checkBoxState[position] = true;
} else {
checkBoxState[position] = false;
}
}
});
return convertView;
}
}
}