données d'erreur d'accès à la base de données dans Android

Question

public String[] getdata() 
    { 
     try 
      { 
      myDB = this.openOrCreateDatabase("Task", MODE_PRIVATE, null); 

      Cursor c=myDB.rawQuery("SELECT * from "+TableName+";",null); 
      c.moveToFirst(); 


      for(int i=0;i<c.getCount();++i) 
      { 
       String str0=c.getString(0); 
      System.out.println(str0); 
       arr[i]=str0; 

       c.moveToNext(); 

      }  

      } 
      catch(Exception e) 
      { 
       e.printStackTrace(); 
      } 
      finally 
      { 
       myDB.close(); 
      } 

      return arr; 
    } 

c'est ma fonction ce qui est erroné dans ce ..il montre l'apllication a arrêté de façon inattendue s'il vous plaît aider .. err est

11-29 14:47:07.443: WARN/SQLiteDirectCursorDriver(716): Found SQL string that ends in ; -- SELECT * from Task; 
11-29 14:47:07.453: INFO/System.out(716): ghgf 
11-29 14:47:07.453: INFO/System.out(716): ghgf 
11-29 14:47:07.453: INFO/System.out(716): ghgf 
11-29 14:47:07.463: INFO/System.out(716): ghgf 
11-29 14:47:07.463: INFO/System.out(716): ghgf 
11-29 14:47:07.744: DEBUG/AndroidRuntime(716): Shutting down VM 
11-29 14:47:07.744: WARN/dalvikvm(716): threadid=3: thread exiting with uncaught exception (group=0x4001aa28) 
11-29 14:47:07.754: ERROR/AndroidRuntime(716): Uncaught handler: thread main exiting due to uncaught exception 
11-29 14:47:07.773: ERROR/AndroidRuntime(716): java.lang.NullPointerException 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:355) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.AbsListView.obtainView(AbsListView.java:1273) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.ListView.makeAndAddView(ListView.java:1658) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.ListView.fillDown(ListView.java:637) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.ListView.fillFromTop(ListView.java:694) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.ListView.layoutChildren(ListView.java:1516) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.AbsListView.onLayout(AbsListView.java:1112) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.view.View.layout(View.java:6569) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.FrameLayout.onLayout(FrameLayout.java:333) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.view.View.layout(View.java:6569) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.LinearLayout.onLayout(LinearLayout.java:918) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.view.View.layout(View.java:6569) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.widget.FrameLayout.onLayout(FrameLayout.java:333) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.view.View.layout(View.java:6569) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.view.ViewRoot.performTraversals(ViewRoot.java:979) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1613) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.os.Handler.dispatchMessage(Handler.java:99) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.os.Looper.loop(Looper.java:123) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at android.app.ActivityThread.main(ActivityThread.java:4203) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at java.lang.reflect.Method.invoke(Method.java:521) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 
11-29 14:47:07.773: ERROR/AndroidRuntime(716):  at dalvik.system.NativeStart.main(Native Method) 
11-29 14:47:07.793: INFO/Process(63): Sending signal. PID: 716 SIG: 3 

Answer 1

Essayez de ré-écriture la partie où la boucle vous sur le jeu de résultats comme celui-ci et voir si cela le rend mieux:

Cursor c = myDB.rawQuery("SELECT * FROM " + TableName, null); 
if (c.moveToFirst()) 
{ 
    arr = new String[c.getCount()]; 
    int i = 0; 
    do 
    { 
     String str0 = c.getString(0); 
     System.out.println(str0); 
     arr[i] = str0; 
     i++; 
    } 
    while (c.moveToNext()); 
} 

Answer 2

http://www.netmite.com/android/mydroid/donut/frameworks/base/core/java/android/database/sqlite/SQLiteDirectCursorDriver.java

http://www.netmite.com/android/mydroid/donut/frameworks/base/core/java/android/database/sqlite/SQLiteDirectCursorDriver.java

public [More ...] SQLiteDirectCursorDriver(SQLiteDatabase db, String sql, String editTable) { 
     mDatabase = db; 
     mEditTable = editTable; 
     **//TODO remove all callers that end in ; and remove this check** 
     if (sql.charAt(sql.length() - 1) == ';') { 
      **Log.w(TAG, "Found SQL string that ends in ; -- " + sql);** 
      sql = sql.substring(0, sql.length() - 1); 
     } 
     mSql = sql; 
    } 

code ci-dessus nous montrent, une version basse SQLiteDirectCursorDriver mettre en œuvre SQL vérification qui se terminent par ';'. Donc, je suggère de supprimer sql end ';' pour la compatibilité.