我有一个扩展ListFragment并使用SimpleCursorAdapter的类。我创建了2个按钮，使用户可以选择/取消选择列表中的所有内容，这样可以正常工作。列表中可能有200个项目，因此如果他们只想选择其中的190个，则可以选择全部200个，然后取消选择10个。
ListView使用setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
问题是我希望用户能够通过长按行来单独取消选择行。我在setOnItemLongClickListener上使用ListView，但view.isSelected始终返回false，即使选择了该行。
有谁知道为什么会这样。
我已将日志声明用于证明这一事实。
我也看过网络，有些帖子说可能的问题是我使用SimpleCursorAdapter并且它太基本了。
我对适配器，列表和触摸事件不是特别擅长，所以有人能指出我正确的方向吗？
我认为应该解决这个问题，这就是为什么isSelected方法总是返回false。
public class CarerListForGroupMessageFragment extends ListFragment {
private static final String TAG = CarerListForGroupMessageFragment.class.getSimpleName();
RROnCallApplication rrOnCallApp;
Cursor cursor;
ListView listView;
MyAdapter myAdapter;
OnCarerForGroupMessageSelectedListener mListener;
EditText etext;
Button resetSearch;
Button selectAll;
Button deselectAll;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
rrOnCallApp = (RROnCallApplication) getActivity().getApplicationContext();
cursor = getCarerList(null);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragmentcarerlistforgroupmessage, container, false);
}
@SuppressWarnings("deprecation")
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
String[] from = new String[]{DBModel.C_CARER_FIRSTNAME, DBModel.C_CARER_LASTNAME, DBModel.C_CARER_PHONENUMBER};
int[] to = {R.id.carerrowfirstname, R.id.carerrowlastname, R.id.carerrowtelno};
myAdapter = (MyAdapter) new MyAdapter(getActivity(),R.layout.carerrow , cursor, from, to);
setListAdapter(myAdapter);
getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
getListView().setFastScrollEnabled(true);
getListView().setTextFilterEnabled(true);
selectAll = (Button) getActivity().findViewById(R.id.carerlistselectallgroupmessage);
selectAll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
for(int i = 0; i < cursor.getCount(); i++){
getListView().setItemChecked(i, true);
}
myAdapter.notifyDataSetChanged();
}
});
deselectAll = (Button) getActivity().findViewById(R.id.carerlistdeselectallgroupmessage);
deselectAll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
for(int i = 0; i < cursor.getCount(); i++) {
getListView().setItemChecked(i, false);
}
myAdapter.notifyDataSetChanged();
}
});
getListView().setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
//Toast.makeText(getActivity(), "On long click listener", Toast.LENGTH_LONG).show();
boolean ret = false;
if(! view.isSelected()) {
//row in list is not currently selected, so set it as selected
Log.e(TAG, "row postion " + position + " in list is not currently selected");
view.setSelected(true);
Cursor cursor = (Cursor) getListAdapter().getItem(position);
String carerID = cursor.getString(cursor.getColumnIndex(DBModel.C_CARER_ID));
String carerFirstName = cursor.getString(cursor.getColumnIndex(DBModel.C_CARER_FIRSTNAME));
String carerLastName = cursor.getString(cursor.getColumnIndex(DBModel.C_CARER_LASTNAME));
String carerTelNo = cursor.getString(cursor.getColumnIndex(DBModel.C_CARER_PHONENUMBER));
Log.e(TAG, "carerID = " + carerID);
mListener.onCarerForGroupMessageSelected(carerID, carerFirstName, carerLastName, carerTelNo, true);
getListView().setItemChecked(position, true);
myAdapter.notifyDataSetChanged();
ret = true;
} else {
Log.e(TAG, "row " + position + " in list is currently selected");
view.setSelected(false);
Cursor cursor = (Cursor) getListAdapter().getItem(position);
String carerID = cursor.getString(cursor.getColumnIndex(DBModel.C_CARER_ID));
String carerFirstName = cursor.getString(cursor.getColumnIndex(DBModel.C_CARER_FIRSTNAME));
String carerLastName = cursor.getString(cursor.getColumnIndex(DBModel.C_CARER_LASTNAME));
String carerTelNo = cursor.getString(cursor.getColumnIndex(DBModel.C_CARER_PHONENUMBER));
Log.e(TAG, "carerID = " + carerID);
mListener.onCarerForGroupMessageSelected(carerID, carerFirstName, carerLastName, carerTelNo, true);
getListView().setItemChecked(position, false);
myAdapter.notifyDataSetChanged();
ret = true;
}
return ret;
}
});
} // End of onActivityCreated
// Container Activity must implement this interface
public interface OnCarerForGroupMessageSelectedListener {
public void onCarerForGroupMessageSelected(String carerId, String carerFirstName, String carerLastName, String carerTelNo ,boolean longClick);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnCarerForGroupMessageSelectedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString() + " must implement OnCarerForGroupMessageSelectedListener");
}
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
Log.e(TAG, "in onListItemClick");
v.setSelected(true);
//v.setBackgroundColor(Color.parseColor("#FF0000"));
TextView carerName = (TextView) getView().findViewById(R.id.textviewcarername);
Cursor cursor = (Cursor) getListAdapter().getItem(position);
String carerID = cursor.getString(cursor.getColumnIndex(DBModel.C_CARER_ID));
String carerFirstName = cursor.getString(cursor.getColumnIndex(DBModel.C_CARER_FIRSTNAME));
String carerLastName = cursor.getString(cursor.getColumnIndex(DBModel.C_CARER_LASTNAME));
String carerTelNo = cursor.getString(cursor.getColumnIndex(DBModel.C_CARER_PHONENUMBER));
Log.e(TAG, "carerID = " + carerID);
mListener.onCarerForGroupMessageSelected(carerID, carerFirstName, carerLastName, carerTelNo, false);
getListView().setItemChecked(position, true);
myAdapter.notifyDataSetChanged();
}
private class MyAdapter extends SimpleCursorAdapter {
@SuppressWarnings("deprecation")
public MyAdapter(Context context, int layout, Cursor c, String[] from, int[] to) {
super(context, layout, c, from, to);
}
@Override
public
View getView(int position, View convertView, ViewGroup parent) {
Log.e(TAG, "inside myadapter getview");
View v = super.getView(position, convertView, parent);
if(v == null)
return null;
Log.e(TAG, "clicked the listview!");
//Cursor c = (Cursor)getItem(position);
// String tagScanTime = c.getString(c.getColumnIndex(LoginValidate.C_TAG_SCAN_TIME));
// ((TextView)v.findViewById(R.id.rowcarername)).setText(name + " signed " + status +" at ");
return v;
}
}} //end of CarerListFragment
[编辑1]
DBModel类
public class DBModel {
private static final String TAG = DBModel.class.getSimpleName();
// table carer column names
public static final String C_CARER_ID_INDEX = BaseColumns._ID;
public static final String C_CARER_ID = "carerid";
public static final String C_CARER_FIRSTNAME = "carerfirstname";
public static final String C_CARER_LASTNAME = "carerlastname";
public static final String C_CARER_PHONENUMBER = "carerphonenumber";
public static final String C_CARER_EMAIL = "careremail";
Context context;
DBHelper dbhelper;
RROnCallApplication rrOnCallApplication;
public DBModel(Context context) {
this.context = context;
dbhelper = new DBHelper();
rrOnCallApplication = (RROnCallApplication) context.getApplicationContext();
}
/**
* inner class to create/open/upgrade database
*
* @author matt
*
*/
private class DBHelper extends SQLiteOpenHelper {
// database name and version number
public static final String DB_NAME = "roadrunneroncall.db";
public static final int DB_VERSION = 3;
// table names
public static final String TABLECARER = "carer";
public DBHelper() {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
Log.e(TAG, "SQLiteOpenHelper oncreate ");
String sqlToCreateCarerTable = String
.format("create table %s ( %s INTEGER primary key, %s TEXT, %s TEXT, %s TEXT, %s TEXT, %s TEXT)",
TABLECARER, C_CARER_ID_INDEX, C_CARER_ID, C_CARER_FIRSTNAME,
C_CARER_LASTNAME, C_CARER_PHONENUMBER, C_CARER_EMAIL);
db.execSQL(sqlToCreateCarerTable);
Log.e(TAG, "oncreate " + sqlToCreateCarerTable);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}//end of onUpgrade
}//end of DBHelper
public SQLiteDatabase getDB(){
return dbhelper.getWritableDatabase(RROnCallApplication.getSecretKey().toString());
}
public void deleteTableCarer() {
// open database
SQLiteDatabase db = dbhelper.getWritableDatabase(RROnCallApplication.getSecretKey().toString());
// delete contents of table
db.delete(DBHelper.TABLECARER, null, null);
// close database
// db.close();
}
public void insertIntoCarer(ContentValues cv) {
SQLiteDatabase db = dbhelper.getWritableDatabase(RROnCallApplication.getSecretKey().toString());
db.insertWithOnConflict(DBHelper.TABLECARER, null, cv, SQLiteDatabase.CONFLICT_REPLACE);
// db.close();
}
public Cursor queryAllFromCarer() {
// open database
SQLiteDatabase db = dbhelper.getReadableDatabase(RROnCallApplication.getSecretKey().toString());
return db.query(DBHelper.TABLECARER, null, null, null, null, null, null);
}
答案 0 :(得分：3)
请检查此代码。
if(! view.isSelected())
而不是
{{1}}
并在DBModel类中保留布尔标志值。