我希望在点击列表视图上实现的每个用户ID后显示列表视图。一旦我点击了用户ID，应用就会立即停止。任何人都有任何想法来解决问题
这是我的第一个列表视图java
public void search() {
String str1 = editText.getText().toString();
// Find ListView to populate
listView = (ListView) findViewById(R.id.list_view1);
//LoginDataBaseAdapter loginDataBaseAdapter = new LoginDataBaseAdapter(getApplicationContext());
List<String> labels = loginDataBaseAdapter.searchData(str1);
ArrayAdapter<String> dataAdapter1 = new ArrayAdapter<String>(this,R.layout.activity_list,R.id.tvsid, labels);
listView.setAdapter(dataAdapter1);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
Bundle passdata = new Bundle();
Cursor listCursor = (Cursor) arg0.getItemAtPosition(arg2);
String studId = listCursor.getString(listCursor
.getColumnIndex("ATTENDANCE.STUDENT_ID"));
// Toast.makeText(getApplicationContext(),
// Integer.toString(nameId), 500).show();
passdata.putString("keyid", studId);
Intent passIntent = new Intent(LecturerSearch.this,
LecturerResult.class);
passIntent.putExtras(passdata);
startActivity(passIntent);
}
});
}
这是第二个列表视图java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_lecturer_result);
listView = (ListView)findViewById(R.id.list_view);
listDataAdapter = new ListDataAdapter(getApplicationContext(),R.layout.attendance_row);
listView.setAdapter(listDataAdapter);
Bundle showData = getIntent().getExtras();
rowId = showData.getString("keyid");
loginDataBaseAdapter = new LoginDataBaseAdapter(getApplicationContext());
cursor = loginDataBaseAdapter.getInformation(db, rowId);
if(cursor.moveToFirst())
{
do{
String location, date;
location=cursor.getString(0);
date=cursor.getString(1);
DataAttendance dataAttendance =new DataAttendance(location,date);
listDataAdapter.add(dataAttendance);
} while(cursor.moveToNext());
}
}
这是第一个列表视图中的函数
public ArrayList<String> searchData(String subject) {
ArrayList<String> view = new ArrayList<String>();
//String [] columns = {"ATTENDANCE.STUDENT_ID"};
String selectQuery = "SELECT ATTENDANCE.STUDENT_ID FROM ATTENDANCE WHERE SUBJECT=\""+ subject+ "\" GROUP BY ATTENDANCE.STUDENT_ID" ;
try {
//Cursor mCursor = db.query("ATTENDANCE",columns,"SUBJECT ='"+subject+"'",null,null,null,null);
Cursor mCursor = db.rawQuery(selectQuery,null);
if (mCursor != null) {
mCursor.moveToFirst();
for (int i = 0; i < mCursor.getCount(); i++) {
view.add(mCursor.getString(0));
mCursor.moveToNext();
}
mCursor.close();
return view;
}
return view;
} catch (Exception e) {
e.printStackTrace();
}
return view;
}
this is the function of second listview
public Cursor getInformation(SQLiteDatabase db, String id){
Cursor cursor;
String[] projections = {"LOCATION","DATE"};
db = dbHelper.getReadableDatabase();
cursor = db.query("ATTENDANCE",projections,"ATTENDANCE.STUDENT_ID ='"+id+"'",null,null,null,null,null);
/*cursor = db.query("SELECT ATTENDANCE.LOCATION,ATTENDANCE.DATE," +
"ATTENDANCE.SUBJECT,STUDENT.ID FROM STUDENT JOIN ATTENDANCE ON STUDENT.ID=ATTENDANCE.STUDENT_ID",null,null,null,null,null,null,null);*/
return cursor;
}
这是logcat
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.azharwa.studentattendance, PID: 2209
java.lang.ClassCastException: java.lang.String cannot be cast to android.database.Cursor
at com.example.azharwa.studentattendance.LecturerSearch$2.onItemClick(LecturerSearch.java:69)
at android.widget.AdapterView.performItemClick(AdapterView.java:300)
at android.widget.AbsListView.performItemClick(AbsListView.java:1143)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3044)
at android.widget.AbsListView.onTouchUp(AbsListView.java:3845)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:3617)
at android.view.View.dispatchTouchEvent(View.java:8388)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2424)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2158)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2172)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2172)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2172)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2172)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2172)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2172)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2314)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1692)
at android.app.Activity.dispatchTouchEvent(Activity.java:2739)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:71)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2275)
at android.view.View.dispatchPointerEvent(View.java:8578)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4021)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3887)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3449)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3502)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3468)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3578)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3476)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3635)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3449)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3502)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3468)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3476)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3449)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5701)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5675)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5646)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5791)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:143)
at android.os.Looper.loop(Looper.java:122)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(Zy
答案 0 :(得分：0)
java.lang.ClassCastException：
java.lang.String无法转换为android.database.Cursor
您将获得ClassCastException。要解决此错误，请更新onItemClick()方法，如下所示：
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// Student Id
String studId = labels.get(position);
Intent passIntent = new Intent(LecturerSearch.this, LecturerResult.class);
passIntent.putExtra("keyid", studId);
startActivity(passIntent);
}
});
仅供参考，，因为您要将学生ids存储到labels数组，并将其传递给adapter以填充listview。因此，您可以从clicked方法获取position项目onItemClick()并轻松使用此position，您可以从id获取学生labels } array。
希望这会有所帮助〜