我需要在customlistadapter的共享偏好中存储值。当我点击列表视图时，将打开Edittext警告框。在该警告框中我们可以给出数量值。如果我点击提示中的＆＃34;确定＆＃34;按钮数据值应保存在共享首选项中的框。在我的情况下，当我点击listview.help我找到解决方案时应用程序崩溃。谢谢提前。
public CustomListAdapter(Activity activity, ArrayList<Movie> movieItems1,int Groupid,Context context)
{
this.activity = activity;
this.movieItems = movieItems1;
this.Groupid=Groupid;
this.c=context;
//this.arraylist = new ArrayList<Movie>();
this.arraylist=movieItems1;
}
@Override
public int getCount() {
return movieItems.size();
}
@Override
public Object getItem(int location) {
return movieItems.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.list_row, null);
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
NetworkImageView thumbNail = (NetworkImageView) convertView
.findViewById(R.id.thumbnail);
TextView title = (TextView) convertView.findViewById(R.id.title);
TextView rating = (TextView) convertView.findViewById(R.id.rating);
// TextView genre = (TextView) convertView.findViewById(R.id.genre);
// TextView year = (TextView)
// convertView.findViewById(R.id.releaseYear);
TextView quantityTextView = (TextView) convertView.findViewById(R.id.qty);
/*quantityTextView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
handleQuntityClickEvent(position);
}
});*/
MainActivity.listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,int position, long id)
{
handleQuntityClickEvent(position,Groupid);
}
});
// getting movie data for the row
Movie m = movieItems.get(position);
// thumbnail image
thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader);
title.setText(m.getTitle());
quantityTextView.setText("" + m.getQuantity());
rating.setText(m.getGenre().get(0) + " "+ m.getProductscale() + " " +"Rs."+ String.valueOf(m.getGenre().get(1)));
String genreStr = "";
for (String str : m.getGenre()) {
genreStr += str + ", ";
}
genreStr = genreStr.length() > 0 ? genreStr.substring(0,
genreStr.length() - 2) : genreStr;
// genre.setText(genreStr);
// release year
// year.setText(String.valueOf(m.getYear()));
return convertView;
}
/**
* launch a edi
*
* @param position
*/
protected void handleQuntityClickEvent(int position, final int Groupid) {
// TODO launch a dialog with edittext. The view has OK and Cancel
// button. if the OK button pressed then
this.mPosition = position;
Builder alertDialog = new AlertDialog.Builder(activity);
final EditText editText = new EditText(activity);
editText.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL | InputType.TYPE_NUMBER_FLAG_SIGNED);
editText.setHint("Quantity");
editText.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT));
alertDialog.setView(editText);// set a editext view here
alertDialog.setTitle("Add Quantity");
sharedpreferences = c.getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
final Editor editor = sharedpreferences.edit();
alertDialog.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which)
{
//SharedPreferences pref = mContext.getSharedPreferences("MyPref", Context.MODE_PRIVATE);
editor.putInt("Userid", Groupid);
editor.commit();
handleOkButtonPressed(editText);
dialog.dismiss();
}
});
alertDialog.setNegativeButton("Cancel", null);
alertDialog.show();
}
logcat的
01-06 16:58:31.281: E/AndroidRuntime(16893): FATAL EXCEPTION: main
01-06 16:58:31.281: E/AndroidRuntime(16893): java.lang.NullPointerException
01-06 16:58:31.281: E/AndroidRuntime(16893): at com.telveg.adater.CustomListAdapter.handleQuntityClickEvent(CustomListAdapter.java:196)
01-06 16:58:31.281: E/AndroidRuntime(16893): at com.telveg.adater.CustomListAdapter$1.onItemClick(CustomListAdapter.java:127)
01-06 16:58:31.281: E/AndroidRuntime(16893): at android.widget.AdapterView.performItemClick(AdapterView.java:301)
01-06 16:58:31.281: E/AndroidRuntime(16893): at android.widget.AbsListView.performItemClick(AbsListView.java:1508)
01-06 16:58:31.281: E/AndroidRuntime(16893): at android.widget.AbsListView$PerformClick.run(AbsListView.java:3293)
01-06 16:58:31.281: E/AndroidRuntime(16893): at android.widget.AbsListView$1.run(AbsListView.java:4554)
01-06 16:58:31.281: E/AndroidRuntime(16893): at android.os.Handler.handleCallback(Handler.java:725)
01-06 16:58:31.281: E/AndroidRuntime(16893): at android.os.Handler.dispatchMessage(Handler.java:92)
01-06 16:58:31.281: E/AndroidRuntime(16893): at android.os.Looper.loop(Looper.java:176)
01-06 16:58:31.281: E/AndroidRuntime(16893): at android.app.ActivityThread.main(ActivityThread.java:5365)
01-06 16:58:31.281: E/AndroidRuntime(16893): at java.lang.reflect.Method.invokeNative(Native Method)
01-06 16:58:31.281: E/AndroidRuntime(16893): at java.lang.reflect.Method.invoke(Method.java:511)
01-06 16:58:31.281: E/AndroidRuntime(16893): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
01-06 16:58:31.281: E/AndroidRuntime(16893): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
01-06 16:58:31.281: E/AndroidRuntime(16893): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
而不是这一行
MainActivity.listView.setOnItemClickListener(new OnItemClickListener() {
使用
convertView.setOnClickListener(){
handleQuntityClickEvent(position,Groupid);
}
并在 getView（）
中移动此代码块