我有自定义SimpleCursorAdapter MySqlCursorAdapter。我希望在我的班级MySqlCursorAdapter中使用PageFragment，但是当我点击任意按钮时出现错误.CopyOfMainActivity活动
PageFragment.java
public class PageFragment extends Fragment {
static final String ARGUMENT_PAGE_NUMBER = "arg_page_number";
int pageNumber;
int backColor;
final String Tag="States";
SQLiteDatabase db;
static Cursor c, c2;
ContentValues cv;
static int itemselected, id_itemselected;
final static int M_EDIT1 = 100;
final static int M_EDIT2 = 101;
final static int M_DELETE = 102;
final static int M_ADD = 103;
final static int M_REF = 104;
final static int D_EDIT = 200;
final static int D_DELETE = 201;
final static int D_ADD = 202;
ListView lvMain_today;
DialogFragment dlg1;
TextView tv;
static SimpleCursorAdapter scAdapter, scAdapter2;
MySqlCursorAdapter adapter = null;
static PageFragment newInstance(int page) {
PageFragment pageFragment = new PageFragment();
Bundle arguments = new Bundle();
arguments.putInt(ARGUMENT_PAGE_NUMBER, page);
pageFragment.setArguments(arguments);
return pageFragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
pageNumber = getArguments().getInt(ARGUMENT_PAGE_NUMBER);
// dlg1 = new dialog_edit();
}
@Override
public boolean onContextItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case M_EDIT1:
dlg1.show(getFragmentManager(), "dlg1");
break;
case M_EDIT2:
Toast.makeText(getActivity(), "Изменение во втором списке", Toast.LENGTH_SHORT).show();
break;
case M_DELETE:
//dlg2.show(getFragmentManager(), "dlg2");
break;
case M_ADD:
break;
default:
return super.onContextItemSelected(item);
}
return true;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d(Tag, "onCreateView1");
View view = inflater.inflate(R.layout.activity_page_fragment, null);
lvMain_today = (ListView) view.findViewById(R.id.list);
//tv = (TextView) view.findViewById(R.id.tv);
Log.d(Tag, "onCreateView2");
OnCreateContextMenuListener occm1 = new OnCreateContextMenuListener() {
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
// TODO Auto-generated method stub
AdapterContextMenuInfo aMenuInfo = (AdapterContextMenuInfo) menuInfo;
itemselected = aMenuInfo.position;
id_itemselected = (int) aMenuInfo.id;
menu.add(Menu.NONE, M_EDIT1, Menu.NONE, "Изменить1");
menu.add(Menu.NONE, M_DELETE, Menu.NONE, "Удалить1");
menu.add(Menu.NONE, M_ADD, Menu.NONE, Integer.toString(id_itemselected));
}
};
Log.d(Tag, "onCreateView3");
OnCreateContextMenuListener occm2 = new OnCreateContextMenuListener() {
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
// TODO Auto-generated method stub
AdapterContextMenuInfo aMenuInfo = (AdapterContextMenuInfo) menuInfo;
itemselected = aMenuInfo.position;
id_itemselected = (int) aMenuInfo.id;
menu.add(Menu.NONE, M_EDIT2, Menu.NONE, "Изменить2");
menu.add(Menu.NONE, M_DELETE, Menu.NONE, "Удалить2");
menu.add(Menu.NONE, M_ADD, Menu.NONE, Integer.toString(id_itemselected));
}
};
switch (pageNumber){
case 0:
Log.d(Tag, "switch (pageNumber)1");
// DBase = new DataBase(getActivity());
// db = DBase.getWritableDatabase();
// c = db.query("items1", null, null, null, null, null, null);
case 1:
//пробуем*****
Log.d(Tag, "onCreateView4");
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String id_for_listtsk_today = sdf.format(new Date());
ContentValues cv = new ContentValues();
DBHelper dbHelper = new DBHelper(getActivity());
final SQLiteDatabase db = dbHelper.getWritableDatabase();
Log.d(Tag, "onCreateView5");
try {
c=dbHelper.getCursor(id_for_listtsk_today);
} catch (SQLException sqle) {
Log.d(Tag, "неудача");
throw sqle;
}
String[] arr_date = Pager.logCursor(c);
//*************
Log.d(Tag, "onCreateView6");
getActivity().startManagingCursor(c);
int[] listFields = new int[] { R.id.txtTitle, R.id.textData1 };
String[] dbColumns = new String[] { DBHelper.COLUMN_NAME, DBHelper.COLUMN_TASK };
// Log.d(Tag, "трассировка" );
adapter = new MySqlCursorAdapter(
getActivity(), R.layout.my_list_item,
c, dbColumns, listFields,
dbHelper);
Log.d(Tag, "onCreateView7");
lvMain_today.setAdapter(adapter);
registerForContextMenu(lvMain_today);
lvMain_today.setOnCreateContextMenuListener(occm1);
db.close();
break;
// Log.d(Tag, "switch (pageNumber)2");
// DBase = new DataBase(getActivity());
// db = DBase.getWritableDatabase();
// c2 = db.query("items2", null, null, null, null, null, null);
// getActivity().startManagingCursor(c2);
// String[] from2 = new String[] {"item"};
// int[] to2 = new int[] {R.id.tvText};
// scAdapter2 = new SimpleCursorAdapter(getActivity(), R.layout.item, c2, from2, to2);
// lvMain.setAdapter(scAdapter2);
// lvMain.setOnCreateContextMenuListener(occm2);
// db.close();
// break;
}
return view;
}
}
CopyOfMainActivity.java
public class CopyOfMainActivity extends FragmentActivity implements OnClickListener {
// Button btnCalendar;
//*******************************************8
String[] names = {"Иван", "Марья", "Петр", "Антон", "Даша", "Борис",
"Костя", "Игорь", "Анна", "Денис", "Андрей"};
//Button buttonAddTask;
public final static String FILE_NAME = "filename";
public final static String BROADCAST_ACTION = "ru.ok.intent.action.repeatingalarmservice";
final String Tag="States";
final String Ten = "Ten";
static String login;
TextView txtDataTaskToday;
String id_for_listtsk_today;
ListView lvMain_today;
String[] arr_date;
SharedPreferences sPref;
static Cursor c;
private ListView listView = null;
SQLiteDatabase db;
static boolean MyFlag_onClick = false;
Button Bcalendar;
Button BAddTask;
Button Refresh;
LinearLayout ll;
Context ctx;
//public static String id_for_listtsk_today;
// static SQLiteDatabase db;
MySqlCursorAdapter adapter = null;
private static final int CM_DELETE_ID = 1;
private AlarmManagerBroadcastReceiver alarm;
//private UpdateCursorBroadcastReceiver alarmUpdateCursor;
//пробуем зарегить Broadcast
// RepeatingAlarmService br;
public static final String APP_PREFERENCES = "mysettings";
public static final String ACCAUNT_NAME = "accauntName";
AlarmManager alarmManager;
int REQUEST_CODE = 11223344;
//*******************Google*********************
private static final Level LOGGING_LEVEL = Level.OFF;
private static final String PREF_ACCOUNT_NAME = "accountName";
static final String TAG = "TasksSample";
static final int REQUEST_GOOGLE_PLAY_SERVICES = 0;
static final int REQUEST_AUTHORIZATION = 1;
static final int REQUEST_ACCOUNT_PICKER = 2;
final HttpTransport transport = AndroidHttp.newCompatibleTransport();
final JsonFactory jsonFactory = new GsonFactory();
GoogleAccountCredential credential;
List<String> tasksList;
List<String> tasksList_Note;
List<String> result_Date;
final String ATTRIBUTE_TITLE_TEXT="title";
final String ATTRIBUTE_NOTE_TEXT="note";
final String ATTRIBUTE_DATE_TEXT="date";
static com.google.api.services.tasks.Tasks service;
int numAsyncTasks;
//переменные для Pager
static final int PAGE_COUNT = 4;
ViewPager pager;
PagerAdapter pagerAdapter;
LinearLayout L_view;
//***********************************************8
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.d(Tag, "copyofMaimActivity1...");
if (getIntent().getBooleanExtra("finish", false)) finish();
super.onCreate(savedInstanceState);
Log.d(Tag, "copyofMaimActivity2");
ll = (LinearLayout) findViewById(R.id.ll);
setContentView(R.layout.pager_activity_main);
// btnCalendar = (Button) findViewById(R.id.btnActTwo);
// btnCalendar.setOnClickListener(this);
//останавливаем AlarmManager
try {
alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Intent intent_stop_alarm = new Intent(BROADCAST_ACTION);
alarmManager.cancel(PendingIntent.getBroadcast(this, REQUEST_CODE, intent_stop_alarm, 0));
} catch (Exception e) {
// TODO: handle exception
}
Bcalendar = (Button) findViewById(R.id.Bcalendar);
BAddTask = (Button) findViewById(R.id.BAddTask);
Bcalendar.setOnClickListener(this);
BAddTask.setOnClickListener(this);
Refresh = (Button) findViewById(R.id.refresh);
Refresh.setOnClickListener(this);
alarm = new AlarmManagerBroadcastReceiver();
//alarmUpdateCursor = new UpdateCursorBroadcastReceiver();
//*********************************************
// переменные для query
String[] columns = null;
String selection = null;
String[] selectionArgs = null;
String groupBy = null;
String having = null;
String orderBy = null;
//*********работа с БД****************
// создаем объект для данных
txtDataTaskToday = (TextView) findViewById(R.id.txtDataTaskToday);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String id_for_listtsk_today = sdf.format(new Date());
//final String b = id_for_listtsk_today;
txtDataTaskToday.setText(id_for_listtsk_today.toString());
// txtDataTaskToday.setPaintFlags(txtDataTaskToday.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
// Log.d(Tag, "id_for_listtsk_today ="+id_for_listtsk_today );
ContentValues cv = new ContentValues();
DBHelper dbHelper = new DBHelper(this);
final SQLiteDatabase db = dbHelper.getWritableDatabase();
columns = new String[] {"name"};
selection = "data_id = ?";
selectionArgs = new String[] {id_for_listtsk_today};
//c = db.query("mytable", columns, selection, selectionArgs, null, null, null);
try {
c=dbHelper.getCursor(id_for_listtsk_today);
} catch (SQLException sqle) {
Log.d(Tag, "неудача");
throw sqle;
}
// String[] arr_date = logCursor(c);
Log.d(Tag, "paint_LV");
// paint_LV(c, dbHelper);тут закоментили так как делаем Pager
//toCallAsynchronous();//запускаем аналог слушателя
// создаем фильтр для BroadcastReceiver
// br = new RepeatingAlarmService();
// IntentFilter intFilt = new IntentFilter(BROADCAST_ACTION);
// // регистрируем (включаем) BroadcastReceiver
// registerReceiver(br, intFilt);
//проверяем настройки аккаунта
googleConnect();
//останавливаем и запускаем службу обновления БД и Гугла
Log.d(Tag,"pager 1");
pager = (ViewPager) findViewById(R.id.pager);
Log.d(Tag,"pager 2");
pagerAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager());
Log.d(Tag,"pager 3");
pager.setAdapter(pagerAdapter);
pager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
Log.d(Tag, "onPageSelected, position = " + position);
}
@Override
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
void refreshView() {
Log.d(Tag, "refreshView");
// pager = (ViewPager) findViewById(R.id.pager);
Log.d(Tag,"pager 2");
pagerAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager());
Log.d(Tag,"pager 3");
pager.setAdapter(pagerAdapter);
}
private void paint_LV(Cursor c, DBHelper dbHelper) {
//*********работа с БД****************
lvMain_today = (ListView) findViewById(R.id.list);
// lvMain_today.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
//this.listView=getl
//listView = MainActivity.this.getlgetListView();
int n = 0; // прокручиваем до начала
lvMain_today.smoothScrollToPosition(n);
lvMain_today.setItemsCanFocus(false);
lvMain_today.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
//ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_multiple_choice, arr_date);// R.layout.item, my_list_item
startManagingCursor(c);
int[] listFields = new int[] { R.id.txtTitle, R.id.textData1 };
String[] dbColumns = new String[] { DBHelper.COLUMN_NAME, DBHelper.COLUMN_TASK };
// Log.d(Tag, "трассировка" );
CopyOfMainActivity.this.adapter = new MySqlCursorAdapter(
this, R.layout.my_list_item,
c, dbColumns, listFields,
dbHelper);
//
lvMain_today.setAdapter(CopyOfMainActivity.this.adapter);
registerForContextMenu(lvMain_today);
// setListAdapter(MainActivity.this.adapter);
//lvMain_today.setItemsCanFocus(true);
names = arr_date;
//проверяем наличие интернета
// isOnline();
// alarmUpdateCursor.CancelAlarm(this);
// alarmUpdateCursor.SetAlarm(this);
//c.close();
//db.close();
//dbHelper.close();
}
private String[] logCursor(Cursor c) {
// TODO Auto-generated method stub
final String Tag="States";
String[] arr_date = new String[c.getCount()];//String[] arr_date = new String[] {};
// Log.d(Tag,"мы в курсоре");
if (c!=null) {
if (c.moveToFirst()) {
// Log.d(Tag,"мы в курсоре1");
String str;
int i=-1;
do {
// Log.d(Tag,"мы в курсоре2");
str="";
i=i+1;
for (String cn: c.getColumnNames()) {
str = str.concat(c.getString(c.getColumnIndex(cn)));
}
// Log.d(Tag, "++++"+str);
arr_date[i]=String.valueOf(str);
} while (c.moveToNext());
}
}
return arr_date;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
// menu.add(0, 1, 0, "Calendar");
// menu.add(0, 2, 0, "Start");
menu.add(0, 3, 3, "Exit");
// menu.add(0, 4, 1, "Google");
menu.add(1, 5, 2, "Stop");
menu.add(1, 6, 4, "accaunt");
menu.add(1, 7, 4, "pager");
return super.onCreateOptionsMenu(menu);
// getMenuInflater().inflate(R.menu.main, menu);
//return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
StringBuilder sb = new StringBuilder();
// Выведем в TextView информацию о нажатом пункте меню
// txtDataTaskToday.setText("Item Menu");
// txtDataTaskToday.setText(item.getGroupId());
// txtDataTaskToday.setText("\r\n itemId: " + String.valueOf(item.getItemId()));
// txtDataTaskToday.setText("\r\n order: " + String.valueOf(item.getOrder()));
// txtDataTaskToday.setText("\r\n title: " + item.getTitle());
switch (item.getItemId()) {
case 1:
Intent intent = new Intent(this, ToDoCalendarActivity.class);
// sdt.execute();
onDestroy();
break;
case 2:
//******************************пробуем засунуть сюда настройки
SharedPreferences settings = getPreferences(Context.MODE_PRIVATE);
String nastrPreferences = settings.getString(PREF_ACCOUNT_NAME, null);
//*******************************
startService(new Intent(this, ServiceUpdate.class).putExtra("preferences", nastrPreferences));
break;
case 3:
sPref = getPreferences(MODE_PRIVATE);
String savedText = sPref.getString(Ten, "");
Log.d(Tag, "пытаемся выйти");
Intent intent_cal = new Intent("com.BAO.OK1.SOME_ACTION");;
// intent_cal.setType("spartan");
sendBroadcast(intent_cal);
onDestroy();
//finish();
break;
case 4:
Log.d(Tag, "пытаемся открыть гугл");
Intent intent_google = new Intent(this, TasksSample.class);
startActivity(intent_google);
onDestroy();
break;
case 5:
//stopService(new Intent(this, ServiceUpdate.class));
//останавливаем AlarmManager
alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Intent intent_stop_alarm = new Intent(BROADCAST_ACTION);
alarmManager.cancel(PendingIntent.getBroadcast(this, REQUEST_CODE, intent_stop_alarm, 0));
break;
case 6:
//googleConnect();
rewriteAccaunt();
break;
case 7:
Intent intent_pager = new Intent(this, Pager.class);
startActivity(intent_pager);
// sdt.execute();
onDestroy();
break;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onStart() {
super.onStart();
try {
CopyOfMainActivity.this.onRestart();
} catch (Exception e) {
// Log.d(Tag, "не получилось рестартануть");
}
// Log.d(Tag, "MainActivity: onStart()");
if(alarm != null){
alarm.CancelAlarm(this);
}else{
Toast.makeText(this, "Alarm is null", Toast.LENGTH_SHORT).show();
}
Log.d(Tag, "конец фуекции onstart");
}
@Override
protected void onResume() {
super.onResume();
// if (checkGooglePlayServicesAvailable()) {
// haveGooglePlayServices();
// }
// Log.d(Tag, "MainActivity: onResume()");
}
protected void onDestroy() {
super.onDestroy();
// закрываем подключение при выходе
// ToDoCalendarActivity.this.finish();
Log.d(Tag, "начинаем onDestroy");
finish();
Log.d(Tag, "финишировали onDestroy");
// db.close();
try {
//******************************пробуем засунуть сюда настройки
SharedPreferences settings = getPreferences(Context.MODE_PRIVATE);
String nastrPreferences = settings.getString(PREF_ACCOUNT_NAME, null);
//*******************************
// startService(new Intent(this, ServiceUpdate.class).putExtra("preferences", nastrPreferences));
// Log.d(Tag, "запустили службу ServiceUpdate");
} catch (Exception e) {
// TODO: handle exception
}
}
@Override
protected void onPause() {
super.onPause();
//this.dbHelper.close();
// Log.d(Tag, "MainActivity: onPause()");
}
@Override
protected void onStop() {
super.onStop();
// Log.d(Tag, "MainActivity: onStop()");
}
@Override
protected void onRestart() {
super.onRestart();
// new SelectDataTask().execute();
// Log.d(Tag, "MainActivity: onRestart()");
}
@Override
public void onBackPressed() {
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(100);
// Log.d(Tag, "Была нажата кнопка возврат");
return;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.d(Tag, "onClick(View v)");
switch (v.getId()) {
case R.id.Bcalendar:
Intent intent = new Intent(this, ToDoCalendarActivity.class);
// intent.putExtra("finish_cal", false);
startActivity(intent);
Log.d(Tag, "пытаемся перейти в КАЛЕНДАРЬ");
onDestroy();
break;
case R.id.BAddTask:
Toast.makeText(this, "добавляем значение", Toast.LENGTH_LONG).show();
Log.d(Tag,"BAddTask" + ListTsk.id_for_listtsk);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String id_for_listtsk_today = sdf.format(new Date());
Intent intent_add = new Intent(this, AddLineBD.class);
intent_add.putExtra("id_for_list", id_for_listtsk_today);
startActivity(intent_add);
onDestroy();
break;
case R.id.refresh:
CopyOfAsyncLoadTasks_Del.run(this);
break;
}
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
Log.d(Tag, "создаем контекстное меню");
menu.add(0, CM_DELETE_ID, 0, "Удалить запись");
}
@Override
public boolean onContextItemSelected(MenuItem item) {
Log.d(Tag, "показываем контекстное меню");
String[] columns = null;
String selection = null;
String[] selectionArgs = null;
String groupBy = null;
String having = null;
String orderBy = null;
if (item.getItemId() == CM_DELETE_ID) {
// получаем инфу о пункте списка
AdapterContextMenuInfo acmi = (AdapterContextMenuInfo) item.getMenuInfo();
ContentValues cv = new ContentValues();
DBHelper dbHelper = new DBHelper(this);
final SQLiteDatabase db = dbHelper.getWritableDatabase();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String id_for_listtsk_today = sdf.format(new Date());
int delCount = db.delete("mytable", "_id = " + acmi.id, null);
Log.d(Tag, "dcxdcc");
columns = new String[] {"name"};
selection = "data_id = ?";
selectionArgs = new String[] {id_for_listtsk_today};
try {
c=dbHelper.getCursor(id_for_listtsk_today);
} catch (SQLException sqle) {
// Log.d(Tag, "неудача");
throw sqle;
}
// String[] arr_date = logCursor(c);
paint_LV(c, dbHelper);
// MainActivity.this.adapter.notifyDataSetChanged();
dbHelper.close();
// удаляем Map из коллекции, используя позицию пункта в списке
// data.remove(acmi.position);
// уведомляем, что данные изменились
// sAdapter.notifyDataSetChanged();
return true;
}
return super.onContextItemSelected(item);
}
private class MyFragmentPagerAdapter extends FragmentPagerAdapter {
public MyFragmentPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return PageFragment.newInstance(position);
}
@Override
public int getCount() {
return PAGE_COUNT;
}
@Override
public CharSequence getPageTitle(int position) {
return "Title " + position;
}
}
日志
06-11 11:58:12.828: D/States(12636): начинаем onDestroy
06-11 11:58:12.835: D/States(12636): финишировали onDestroy
06-11 11:58:16.218: D/AndroidRuntime(12636): Shutting down VM
06-11 11:58:16.218: W/dalvikvm(12636): threadid=1: thread exiting with uncaught exception (group=0x40018578)
06-11 11:58:16.289: E/AndroidRuntime(12636): FATAL EXCEPTION: main
06-11 11:58:16.289: E/AndroidRuntime(12636): java.lang.RuntimeException: Unable to pause activity {com.example.ok1/com.example.ok1.CopyOfMainActivity}: java.lang.IllegalStateException: No activity
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2358)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2315)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:2295)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.app.ActivityThread.access$1700(ActivityThread.java:117)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:942)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.os.Handler.dispatchMessage(Handler.java:99)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.os.Looper.loop(Looper.java:130)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.app.ActivityThread.main(ActivityThread.java:3687)
06-11 11:58:16.289: E/AndroidRuntime(12636): at java.lang.reflect.Method.invokeNative(Native Method)
06-11 11:58:16.289: E/AndroidRuntime(12636): at java.lang.reflect.Method.invoke(Method.java:507)
06-11 11:58:16.289: E/AndroidRuntime(12636): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
06-11 11:58:16.289: E/AndroidRuntime(12636): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
06-11 11:58:16.289: E/AndroidRuntime(12636): at dalvik.system.NativeStart.main(Native Method)
06-11 11:58:16.289: E/AndroidRuntime(12636): Caused by: java.lang.IllegalStateException: No activity
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1075)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1070)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.support.v4.app.FragmentManagerImpl.dispatchPause(FragmentManager.java:1875)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.support.v4.app.FragmentActivity.onPause(FragmentActivity.java:401)
06-11 11:58:16.289: E/AndroidRuntime(12636): at com.example.ok1.CopyOfMainActivity.onPause(CopyOfMainActivity.java:490)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.app.Activity.performPause(Activity.java:3862)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1191)
06-11 11:58:16.289: E/AndroidRuntime(12636): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2345)
06-11 11:58:16.289: E/AndroidRuntime(12636): ... 12 more
06-11 11:58:16.367: D/dalvikvm(12636): GC_CONCURRENT freed 179K, 45% free 3237K/5831K, external 1231K/1560K, paused 4ms+3ms
My_list_item.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#CCFFCC"
android:gravity="center_vertical"
android:orientation="horizontal" >
<CheckBox
android:id="@+id/bcheck"
android:layout_width="62dp"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:focusable="false"
android:gravity="center_vertical|center_horizontal" />
<LinearLayout
android:layout_width="246dp"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/txtTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusable="false"
android:gravity="left|center_vertical"
android:maxLength="25"
android:text="Test"
android:textColor="#000000"
android:textSize="18dp"
android:textStyle="bold" />
<TextView
android:id="@+id/textData1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ellipsize="marquee"
android:focusable="false"
android:maxLength="40"
android:maxLines="1"
android:scrollHorizontally="true"
android:text="TextView"
android:textColor="#000000" />
</LinearLayout>
</LinearLayout>
Pager.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.PagerTabStrip
android:id="@+id/pagerTabStrip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top">
</android.support.v4.view.PagerTabStrip>
</android.support.v4.view.ViewPager>
</RelativeLayout>
activity_page_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ListView
android:id="@+id/lvMain"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tv"
android:text="Запись 1">
</TextView>
</LinearLayout>
我做错了什么？我如何理解错误出现在“破坏”活动
中答案 0 :(得分：1)
许多代码存在很多问题。没有阅读所有这些，所以这个答案并没有解决所有问题，但希望它可以帮助你在学习的道路上前进。 @ Houcine的调查结果也很有帮助，虽然他们没有直接回答你所看到的例外问题。
finish()中的 onDestroy()不正确。该活动已被销毁。删除它。
直接拨打onDestroy()是不正确的。删除电话。如果您想关闭活动，只需致电finish()。
通常，当发生特定事件时，框架会调用onXxx()覆盖。你不应该自己打电话。
此外，在onCreate()中，您可能会在正确创建活动之前完成活动：
if (getIntent().getBooleanExtra("finish", false)) finish();
super.onCreate(savedInstanceState);
答案 1 :(得分：0)
在onCreate()方法中，您遇到两个问题：
1-您正在创建活动之前完成活动。
Log.d(Tag, "copyofMaimActivity1...");
if (getIntent().getBooleanExtra("finish", false)) finish();
super.onCreate(savedInstanceState);
更正：您应该在super.onCreate()
Activity方法
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.d(Tag, "copyofMaimActivity1...");
super.onCreate(savedInstanceState);//should be the first instruction of the onCreate() method
if (getIntent().getBooleanExtra("finish", false)) finish();
// your code.....
}
2-您在将View布局设置为Content之前尝试找到Activity：
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.d(Tag, "copyofMaimActivity1...");
if (getIntent().getBooleanExtra("finish", false)) finish();
super.onCreate(savedInstanceState);
Log.d(Tag, "copyofMaimActivity2");
ll = (LinearLayout) findViewById(R.id.ll); //ll will be null and you will have a NullPointerException
setContentView(R.layout.pager_activity_main);
}
更正：在通过ID（或其标记）检索视图的任何操作之前，您应该调用setContentView(int resId);：
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.d(Tag, "copyofMaimActivity1...");
if (getIntent().getBooleanExtra("finish", false)) finish();
super.onCreate(savedInstanceState);
Log.d(Tag, "copyofMaimActivity2");
setContentView(R.layout.pager_activity_main); // should be called before any call of findViewById()
//your code ...
}
ll = (LinearLayout) findViewById(R.id.ll);
在onDestroy()方法中，onFinish()的调用出现问题，您正在调用super.onDestroy()，这会导致活动失败，而您正在尝试调用{{1}方法（杀死已经被finish()调用破坏的活动。你的代码应该是这样的：
super.onDestroy()