ListView Blank不显示数据库条目

时间：2013-02-22 00:27:23

标签： android listview arraylist cursor android-logcat

当我的数据库数据发生变化时尝试让我的ListView刷新时，我的列表视图现在完全空白。 itemare被添加到数据库但它们不再显示在列表视图中。在所有db列中，只有一个设置为在listview（sname）中显示。我的Logcat指向requery但我不知道如何继续修复。请指教。

logcat的：

   02-19 22:41:41.303: W/SQLiteCursor(1083): requery() failed database /data/data/com.loginplus.home/databases/SiteLogindb (conn# 0) already closed
   02-19 22:41:41.303: W/SQLiteCursor(1083): java.lang.IllegalStateException: database /data/data/com.loginplus.home/databases/SiteLogindb (conn# 0) already closed
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at android.database.sqlite.SQLiteDatabase.verifyDbIsOpen(SQLiteDatabase.java:2082)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at android.database.sqlite.SQLiteDatabase.getDbConnection(SQLiteDatabase.java:2407)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at android.database.sqlite.SQLiteDatabase.getDatabaseHandle(SQLiteDatabase.java:2388)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at android.database.sqlite.SQLiteCursor.requery(SQLiteCursor.java:246)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at android.app.Activity.performRestart(Activity.java:4505)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at android.app.Activity.performResume(Activity.java:4531)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2434)
  02-19 22:41:41.303: W/SQLiteCursor(1083):     at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2472)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1173)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at android.os.Handler.dispatchMessage(Handler.java:99)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at android.os.Looper.loop(Looper.java:137)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at android.app.ActivityThread.main(ActivityThread.java:4424)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at java.lang.reflect.Method.invokeNative(Native Method)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at java.lang.reflect.Method.invoke(Method.java:511)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
   02-19 22:41:41.303: W/SQLiteCursor(1083):    at dalvik.system.NativeStart.main(Native Method)
   02-19 22:41:41.323: W/SQLiteCursor(1083): requery() failed database /data/data/com.loginplus.home/databases/SiteLogindb (conn# 0) already closed
   02-19 22:41:41.323: W/SQLiteCursor(1083): java.lang.IllegalStateException: database /data/data/com.loginplus.home/databases/SiteLogindb (conn# 0) already closed
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at android.database.sqlite.SQLiteDatabase.verifyDbIsOpen(SQLiteDatabase.java:2082)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at android.database.sqlite.SQLiteDatabase.getDbConnection(SQLiteDatabase.java:2407)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at android.database.sqlite.SQLiteDatabase.getDatabaseHandle(SQLiteDatabase.java:2388)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at android.database.sqlite.SQLiteCursor.requery(SQLiteCursor.java:246)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at android.app.Activity.performRestart(Activity.java:4505)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at android.app.Activity.performResume(Activity.java:4531)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2434)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2472)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1173)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at android.os.Handler.dispatchMessage(Handler.java:99)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at android.os.Looper.loop(Looper.java:137)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at android.app.ActivityThread.main(ActivityThread.java:4424)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at java.lang.reflect.Method.invokeNative(Native Method)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at java.lang.reflect.Method.invoke(Method.java:511)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
   02-19 22:41:41.323: W/SQLiteCursor(1083):    at dalvik.system.NativeStart.main(Native Method)
   02-19 22:41:41.343: W/SQLiteCursor(1083): requery() failed database /data/data/com.loginplus.home/databases/SiteLogindb (conn# 0) already closed
   02-19 22:41:41.343: W/SQLiteCursor(1083): java.lang.IllegalStateException: database /data/data/com.loginplus.home/databases/SiteLogindb (conn# 0) already closed
   02-19 22:41:41.343: W/SQLiteCursor(1083):    at android.database.sqlite.SQLiteDatabase.verifyDbIsOpen(SQLiteDatabase.java:2082)
   02-19 22:41:41.343: W/SQLiteCursor(1083):    at android.database.sqlite.SQLiteDatabase.getDbConnection(SQLiteDatabase.java:2407)
   02-19 22:41:41.343: W/SQLiteCursor(1083):    at android.database.sqlite.SQLiteDatabase.getDatabaseHandle(SQLiteDatabase.java:2388)
   02-19 22:41:41.343: W/SQLiteCursor(1083):    at android.database.sqlite.SQLiteCursor.requery(SQLiteCursor.java:246)
   02-19 22:41:41.343: W/SQLiteCursor(1083):    at android.app.Activity.performRestart(Activity.java:4505)
   02-19 22:41:41.343: W/SQLiteCursor(1083):    at android.app.Activity.performResume(Activity.java:4531)
   02-19 22:41:41.343: W/SQLiteCursor(1083):    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2434)
  02-19 22:41:41.343: W/SQLiteCursor(1083):     at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2472)
  02-19 22:41:41.343: W/SQLiteCursor(1083):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1173)
  02-19 22:41:41.343: W/SQLiteCursor(1083):     at android.os.Handler.dispatchMessage(Handler.java:99)
  02-19 22:41:41.343: W/SQLiteCursor(1083):     at android.os.Looper.loop(Looper.java:137)
  02-19 22:41:41.343: W/SQLiteCursor(1083):     at android.app.ActivityThread.main(ActivityThread.java:4424)
  02-19 22:41:41.343: W/SQLiteCursor(1083):     at java.lang.reflect.Method.invokeNative(Native Method)
  02-19 22:41:41.343: W/SQLiteCursor(1083):     at java.lang.reflect.Method.invoke(Method.java:511)
  02-19 22:41:41.343: W/SQLiteCursor(1083):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  02-19 22:41:41.343: W/SQLiteCursor(1083):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  02-19 22:41:41.343: W/SQLiteCursor(1083):     at dalvik.system.NativeStart.main(Native Method)

Logcat 2/2513 

   02-24 20:44:04.032: E/AndroidRuntime(1323): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.loginplus.home/com.loginplus.home.LoginList}: java.lang.NullPointerException
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at android.os.Handler.dispatchMessage(Handler.java:99)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at android.os.Looper.loop(Looper.java:137)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at android.app.ActivityThread.main(ActivityThread.java:4424)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at java.lang.reflect.Method.invokeNative(Native Method)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at java.lang.reflect.Method.invoke(Method.java:511)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at dalvik.system.NativeStart.main(Native Method)
   02-24 20:44:04.032: E/AndroidRuntime(1323): Caused by: java.lang.NullPointerException
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at com.loginplus.home.LoginList.populateList(LoginList.java:92)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at com.loginplus.home.LoginList.onCreate(LoginList.java:41)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at android.app.Activity.performCreate(Activity.java:4465)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
   02-24 20:44:04.032: E/AndroidRuntime(1323):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)

活动类：

  public class LoginList extends Activity implements OnClickListener,    OnItemClickListener {

  private ListView loginList;
  private Button webLogin;

  private ListAdapter loginListAdapter;

  private ArrayList<LoginDetails> loginArrayList;

  List<String> arrayList = new ArrayList<String>();



 @Override 
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 arrayList = populateList();
 loginListAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, populateList());
 setContentView(R.layout.login_listview);


 loginList = (ListView)
 findViewById(R.id.loginlist);
 loginList.setOnItemClickListener(this);

 webLogin = (Button)
 findViewById(R.id.button3);
 webLogin.setOnClickListener(this);


 }

@Override
public void onClick (View v) {
Intent webLoginIntent = new Intent (this, LoginPlusActivity.class);
startActivity(webLoginIntent);

}

public List<String> populateList (){

List<String> webNameList = new ArrayList<String>();

dataStore openHelperClass = new dataStore (this);

SQLiteDatabase sqliteDatabase = openHelperClass.getReadableDatabase();

Cursor cursor = sqliteDatabase.query(dataStore.TABLE_NAME_INFOTABLE, null, null, null,  null, null, dataStore.COLUMN_NAME_SITE, null);

//startManagingCursor(cursor); (revised 2/25/13)


while (cursor.moveToNext()){
String sName = cursor.getString(cursor.getColumnIndex(dataStore.COLUMN_NAME_SITE));
String wUrl = cursor.getString(cursor.getColumnIndex(dataStore.COLUMN_NAME_ADDRESS));
String uName = cursor.getString(cursor.getColumnIndex(dataStore.COLUMN_NAME_USERNAME));
String pWord = cursor.getString(cursor.getColumnIndex(dataStore.COLUMN_NAME_PASSWORD));
String lNotes = cursor.getString(cursor.getColumnIndex(dataStore.COLUMN_NAME_NOTES));

LoginDetails lpDetails = new LoginDetails();

  lpDetails.setsName(sName);
  lpDetails.setwUrl(wUrl);
  lpDetails.setuName(uName);
  lpDetails.setpWord(pWord);
  lpDetails.setlNotes(lNotes);

  loginArrayList.add(lpDetails);
  webNameList.add(sName);
 }

 cursor.close(); //(revised 2/25/13)
 return webNameList;
 }



@Override
protected void onResume() {
super.onResume();

ArrayList<LoginDetails> loginArrayList = new ArrayList<LoginDetails>();
loginArrayList.clear();

arrayList.clear();

arrayList = populateList();

dataStore refreshHelper = new dataStore (this);
SQLiteDatabase sqliteDatabase = refreshHelper.getWritableDatabase();
Cursor cursor = sqliteDatabase.query(dataStore.TABLE_NAME_INFOTABLE, null, null, null, null, null, dataStore.COLUMN_NAME_SITE, null);
String[]columns = new String[] { dataStore.COLUMN_NAME_SITE,    dataStore.COLUMN_NAME_ADDRESS, dataStore.COLUMN_NAME_USERNAME,  dataStore.COLUMN_NAME_PASSWORD, dataStore.COLUMN_NAME_NOTES };
int[] to = new int[]{R.id.rusName, R.id.ruwUrl, R.id.ruuName, R.id.rupWord, R.id.ruNotes};
SimpleCursorAdapter loginListAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, cursor, columns, to);
loginListAdapter.notifyDataSetChanged();

}

@Override
 public void onItemClick(AdapterView<?> arg0 , View arg1, int arg2, long arg3) {
 Toast.makeText(getApplicationContext(), "Selected ID :" + arg2,     Toast.LENGTH_SHORT).show();

 Intent updateDeleteLoginInfo = new Intent (this, UpdateDeleteLoginList.class);



 LoginDetails clickedObject = loginArrayList.get(arg2);

  Bundle loginBundle = new Bundle();
  loginBundle.putString("clickedWebSite",clickedObject.getsName());
  loginBundle.putString("clickedWebAddress",clickedObject.getwUrl());
  loginBundle.putString("clickedUserName",clickedObject.getuName());
  loginBundle.putString("clickedPassWord",clickedObject.getpWord());
  loginBundle.putString("clickedNotes",clickedObject.getlNotes());

  updateDeleteLoginInfo.putExtras(loginBundle);

  startActivityForResult(updateDeleteLoginInfo, 0);   
   }
  }

1 个答案:

答案 0 :(得分：0)

在我看来，问题出在这一行startManagingCursor(cursor);。您要求活动管理光标，但在完成光标后立即关闭连接。只需注释该行，并关闭光标而不是数据库。只需将sqliteDatabase.close();更改为cursor.close()。

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