Android App läuft perfekt im Emulator, aber nicht auf dem Gerät aufgrund externer DB

Question

Ich fand heraus, dass die externe Datenbank, die ich benutze, nicht durch Abfragen in Aktivität (DataConn.java) zugreifen kann.

das Hauptmenü der App MainActivity.java ist das eine zeigte, aber wenn ich den Knopf mit dem Effekt der Umleitung auf ein anderes Layout Aktivität ingameinterface.java drücken, stürzt es ab. T^T Wie kann ich das beheben? bitte hilfe!

DataConn.java

package com.example.hamira.wordmatchinggame; 

import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import java.util.Random; 


public class DataConn extends SQLiteOpenHelper { 
    private static final String DATABASE_NAME = "db_vocabulary.db"; 
    private static final String DB_PATH = "data/data/com.exampasle.hamira.wordmatchinggame/databases/"; 
    private static final String TABLE_NAME = "tblwords"; 
    private SQLiteDatabase db; 
    static int taksi, pamato, a; 


    public DataConn(Context context) { 
     super(context, DATABASE_NAME, null, 1); 
    } 
    @Override 
    public void onCreate(SQLiteDatabase db) { 

    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    } 

    public Cursor getAllData(){ 
     Random r = new Random(); 
     int patad = r.nextInt(41 - 0) + 1; 
     pamato = patad; 
     db = this.getWritableDatabase(); 
     Cursor res = db.rawQuery("select " + 
       "max(case when Key_Word = 'Questn' then Val end) Question,\n" + 
       "max(case when Key_Word = 'Defi' then Val end) Definition,\n" + 
       "max(case when Key_Word = 'Cc1' then Val end) Choice1,\n" + 
       "max(case when Key_Word = 'Cc2' then Val end) Choice2,\n" + 
       "max(case when Key_Word = 'Cc3' then Val end) Choice3,\n" + 
       "max(case when Key_Word = 'Cc4' then Val end) Choice4,\n" + 
       "max(case when Key_Word = 'Ans' then Val end) Answer,\n" + 
       "max(case when Key_Word = 'Stats' then Val end) Status\n" + 
       "from "+TABLE_NAME+" where prima = '"+pamato+"'", null); 

     res.close(); 
     return res; 
    } 

    public Cursor getScore(){ 
     db = this.getWritableDatabase(); 
     Cursor sc = db.rawQuery("select crntscore from TblScore",null); 
     return sc; 
    } 

    public Cursor UpdateScore(){ 
     taksi=ingameinterface.passScore; 
     a = taksi+1; 
     db = this.getWritableDatabase(); 
     Cursor us = db.rawQuery("update TblScore set crntscore='"+a+"'",null); 
     us.moveToFirst(); 
     us.close(); 
     return us; 
    } 
    public Cursor DropPrima(){ 

     db = this.getWritableDatabase(); 
     Cursor udp = db.rawQuery("update TblWords set Val = '1' where CtrlNo = '8' " + 
       "and Prima ='"+pamato+"'",null); 
     udp.moveToFirst(); 
     udp.close(); 

     return udp; 
    } 
    public Cursor ResetPrima(){ 
     int a = ingameinterface.passPrima; 
     db = this.getWritableDatabase(); 
     Cursor udp = db.rawQuery("update TblWords set Val = '0' where CtrlNo = '8' " + 
       "and Prima ='"+a+"'",null); 
     udp.moveToFirst(); 
     udp.close(); 

     return udp; 
    } 
    public Cursor ResetScore(){ 
     db = this.getWritableDatabase(); 
     Cursor us = db.rawQuery("update TblScore set crntscore='0'",null); 
     us.moveToFirst(); 
     us.close(); 
     return us; 
    } 
} 

MainActivity.java

package com.example.hamira.wordmatchinggame; 

import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.ImageButton; 
import android.widget.TextView; 

public class MainActivity extends AppCompatActivity { 
    Intent game; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     game = new Intent(MainActivity.this, ingameinterface.class); 

     TextView btnstrt = (TextView) findViewById(R.id.btnStartGame); 
     btnstrt.setOnClickListener(new View.OnClickListener(){ 
      @Override 
      public void onClick(View v){ 

       startActivity(game); 

      } 

     }); 

     final View btnoff = (ImageButton) findViewById(R.id.imgBtnVoloff); 
     final View btnon = (ImageButton) findViewById(R.id.imgBtnVolon); 

     btnon.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 
       if (v == btnon) { 
        btnoff.setVisibility(View.VISIBLE); 
        btnon.setVisibility(View.GONE); 
        //TURN OFF AUDIO 

       } 
      } 
     }); 
     btnoff.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 
       if (v == btnoff) { 
        btnoff.setVisibility(View.GONE); 
        btnon.setVisibility(View.VISIBLE); 
        //TURN ON AUDIO 

       } 
      } 
     }); 


     TextView btnexit = (TextView) findViewById(R.id.btnQuit); 
     btnexit.setOnClickListener(new View.OnClickListener(){ 
      @Override 
      public void onClick(View arg0){ 
       android.os.Process.killProcess(android.os.Process.myPid()); 
       System.exit(1); 
      } 
     }); 

    } 
} 

ingameinterface.java

package com.example.hamira.wordmatchinggame; 


import android.app.Activity; 
import android.content.DialogInterface; 
import android.database.Cursor; 
import android.support.v7.app.AlertDialog; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 
import android.widget.Toast; 

import java.util.Random; 

public class ingameinterface extends Activity { 
    DataConn myDb; 
    String holdQstn, holdDefi, holdCc1, holdCc2, holdCc3, holdCc4,holdAns, holdStats; 
    static int DBscore, passScore; 
    static int patad, passPrima; 
    TextView TVScore; 
    TextView TVWord, TVDefi, TVCc1, TVCc2, TVCc3, TVCc4; 
    Button ResetBtn; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_ingameinterface); 

     myDb = new DataConn(this); 
     CharSequence text = "GAME ON !"; 
     int duration = Toast.LENGTH_SHORT; 

     Toast toast = Toast.makeText(this, text, duration); 
     toast.show(); 
     rand(); 
     hereWeGo(); 
     ShowMyScore(); 


     //BUTTON CHOICE 1 
     TVCc1 = (TextView) findViewById(R.id.itmCc1); 
     TVCc1.setOnClickListener(new View.OnClickListener(){ 
      public void onClick(View v){ 
       String BtnText1 = TVCc1.getText().toString(); 
       if(holdAns.equals(BtnText1)){ 
        Toast.makeText(getApplicationContext(), BtnText1+" is the correct answer. " + 
          "Excellent!", Toast.LENGTH_SHORT).show(); 

        performAddScore(); 
        ShowMyScore(); 
        dropPrima(); 
        hereWeGo(); 
       }else 
       { 
        Toast.makeText(getApplicationContext(), "Wrong Answer", Toast.LENGTH_SHORT).show(); 
        hereWeGo(); 
       } 
      } 
     }); 
     //BUTTON CHOICE 2 
     TVCc2 = (TextView) findViewById(R.id.itmCc2); 
     TVCc2.setOnClickListener(new View.OnClickListener(){ 
      public void onClick(View v){ 
       String BtnText2 = TVCc2.getText().toString(); 
       if(holdAns.equals(BtnText2)){ 
        Toast.makeText(getApplicationContext(), BtnText2+" is the correct answer. " + 
          "Excellent!", Toast.LENGTH_SHORT).show(); 

        performAddScore(); 
        ShowMyScore(); 
        dropPrima(); 
        hereWeGo(); 
       }else 
       { 
        Toast.makeText(getApplicationContext(), "Wrong Answer", Toast.LENGTH_SHORT).show(); 
        hereWeGo(); 
       } 
      } 
     }); 
     //BUTTON CHOICE 3 
     TVCc3 = (TextView) findViewById(R.id.itmCc3); 
     TVCc3.setOnClickListener(new View.OnClickListener(){ 
      public void onClick(View v){ 
       String BtnText3 = TVCc3.getText().toString(); 
       if(holdAns.equals(BtnText3)){ 
        Toast.makeText(getApplicationContext(), BtnText3+" is the correct answer. " + 
          "Excellent!", Toast.LENGTH_SHORT).show(); 

        performAddScore(); 
        ShowMyScore(); 
        dropPrima(); 
        hereWeGo(); 
       }else 
       { 
        Toast.makeText(getApplicationContext(), "Wrong Answer", Toast.LENGTH_SHORT).show(); 
        hereWeGo(); 
       } 
      } 
     }); 
     //BUTTON CHOICE 4 
     TVCc4 = (TextView) findViewById(R.id.itmCc4); 
     TVCc4.setOnClickListener(new View.OnClickListener(){ 
      public void onClick(View v){ 
       String BtnText4 = TVCc4.getText().toString(); 
       if(holdAns.equals(BtnText4)){ 
        Toast.makeText(getApplicationContext(), BtnText4+" is the correct answer. " + 
          "Excellent!", Toast.LENGTH_SHORT).show(); 

        performAddScore(); 
        ShowMyScore(); 
        dropPrima(); 
        hereWeGo(); 
       }else 
       { 
        Toast.makeText(getApplicationContext(), "Wrong Answer", Toast.LENGTH_SHORT).show(); 
        hereWeGo(); 
       } 
      } 
     }); 

     ResetBtn = (Button) findViewById(R.id.btnReset); 
     ResetBtn.setOnClickListener(new View.OnClickListener(){ 
      @Override 
      public void onClick(View v) { 
       AlertDialog.Builder build = new AlertDialog.Builder(ingameinterface.this); 
       build.setTitle("Reset Confirmation"); 
       build.setMessage("Do you want to reset the game?"); 
       build.setPositiveButton("YES", new DialogInterface.OnClickListener(){ 
        @Override 
        public void onClick(DialogInterface dialog, int which) { 
         //BUTTON YES 
         for(int a=1; a!=41; a++){ 
          passPrima = a; 
          myDb.ResetPrima(); 
         } 
         myDb.ResetScore(); 
         hereWeGo(); 
         ShowMyScore(); 
         Toast.makeText(getApplicationContext(), "Game reset successfully!", Toast.LENGTH_SHORT).show(); 
         dialog.dismiss(); 
        } 
       }); 
       build.setNegativeButton("NO", new DialogInterface.OnClickListener(){ 
        @Override 
        public void onClick(DialogInterface dialog, int which) { 
         //BUTTON NO 
         Toast.makeText(getApplicationContext(), "No", Toast.LENGTH_SHORT).show(); 
         dialog.dismiss(); 
        } 
       }); 
       AlertDialog wew = build.create(); 
       wew.show(); 

      } 
     }); 


    }//onCreate END 
public void rand(){ 
    Random r = new Random(); 
    patad = r.nextInt(41 - 0) + 1; 
} 

    public void hereWeGo(){ 

     Cursor res = myDb.getAllData(); 
     if(res.getCount() == 0){ 
      Toast.makeText(getApplicationContext(), "Error!", Toast.LENGTH_SHORT).show(); 
      return; 
     } 
     while (res.moveToNext()){ 
      holdQstn = String.valueOf(res.getString(0)); 
      holdDefi = String.valueOf(res.getString(1)); 
      holdCc1 = String.valueOf(res.getString(2)); 
      holdCc2 = String.valueOf(res.getString(3)); 
      holdCc3 = String.valueOf(res.getString(4)); 
      holdCc4 = String.valueOf(res.getString(5)); 
      holdAns = String.valueOf(res.getString(6)); 
      holdStats = String.valueOf(res.getString(7)); 
      if (holdStats.equals("1")){ 
       reRollCall(); 
      }else{ 
       TVWord= (TextView) findViewById(R.id.itmWORD); 
       String StrngToTVQstn = holdQstn; 
       TVWord.setText("'"+StrngToTVQstn+"'"); 
       TVDefi= (TextView) findViewById(R.id.itmDefi); 
       String StrngToTVDefi = holdDefi; 
       TVDefi.setText(StrngToTVDefi); 
       TVCc1= (TextView) findViewById(R.id.itmCc1); 
       String StrngToTVCc1 = holdCc1; 
       TVCc1.setText(StrngToTVCc1); 
       TVCc2= (TextView) findViewById(R.id.itmCc2); 
       String StrngToTVCc2 = holdCc2; 
       TVCc2.setText(StrngToTVCc2); 
       TVCc3= (TextView) findViewById(R.id.itmCc3); 
       String StrngToTVCc3 = holdCc3; 
       TVCc3.setText(StrngToTVCc3); 
       TVCc4= (TextView) findViewById(R.id.itmCc4); 
       String StrngToTVCc4 = holdCc4; 
       TVCc4.setText(StrngToTVCc4); 
      } 
     } 

    } 
    public void reRollCall(){ 
     hereWeGo(); 
    } 

    public void performAddScore(){ 
     Random r = new Random(); 
     patad = r.nextInt(41 - 0) + 1; 
     myDb.UpdateScore(); 

    } 
    public void ShowMyScore(){ 
     Cursor sc = myDb.getScore(); 
     while (sc.moveToNext()){ 
      DBscore= Integer.valueOf(sc.getInt(0)); 
      passScore = DBscore; 
      TVScore= (TextView) findViewById(R.id.itmSCORE); 
      TVScore.setText(String.valueOf(passScore)); 

     } 
    } 
    public void dropPrima(){ 
     myDb.DropPrima(); 

    } 
}//class END 

EDIT: Entschuldigung! falscher logcat eingefügt.

AKTUALISIERT logcat

08-02 11:56:54.418 17223-17223/com.example.hamira.wordmatchinggame E/SQLiteLog: (1) no such table: tblwords 08-02 11:56:54.419 17223-17223/com.example.hamira.wordmatchinggame D/AndroidRuntime: Shutting down VM 08-02 11:56:54.420 17223-17223/com.example.hamira.wordmatchinggame E/AndroidRuntime: FATAL EXCEPTION: main 
Process: com.example.hamira.wordmatchinggame, PID: 17223 
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.hamira.wordmatchinggame/com.example.hamira.wordmatchinggame.ingameinterface}: android.database.sqlite.SQLiteException: no such table: tblwords (code 1): , while compiling: select max(case when Key_Word = 'Questn' then Val end) Question, 
max(case when Key_Word = 'Defi' then Val end) Definition, 
max(case when Key_Word = 'Cc1' then Val end) Choice1, 
max(case when Key_Word = 'Cc2' then Val end) Choice2, 
max(case when Key_Word = 'Cc3' then Val end) Choice3, 
max(case when Key_Word = 'Cc4' then Val end) Choice4, 
max(case when Key_Word = 'Ans' then Val end) Answer, 
max(case when Key_Word = 'Stats' then Val end) Status 
from tblwords where prima = '8' 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2525) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2617) 
    at android.app.ActivityThread.access$800(ActivityThread.java:182) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1474) 
    at android.os.Handler.dispatchMessage(Handler.java:111) 
    at android.os.Looper.loop(Looper.java:218) 
    at android.app.ActivityThread.main(ActivityThread.java:5657) 
    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:990) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:785) 
Caused by: android.database.sqlite.SQLiteException: no such table: tblwords (code 1): , while compiling: select max(case when Key_Word = 'Questn' then Val end) Question, 
max(case when Key_Word = 'Defi' then Val end) Definition, 
max(case when Key_Word = 'Cc1' then Val end) Choice1, 
max(case when Key_Word = 'Cc2' then Val end) Choice2, 
max(case when Key_Word = 'Cc3' then Val end) Choice3, 
max(case when Key_Word = 'Cc4' then Val end) Choice4, 
max(case when Key_Word = 'Ans' then Val end) Answer, 
max(case when Key_Word = 'Stats' then Val end) Status 
from tblwords where prima = '8' 
    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:898) 
    at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:509) 
    at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 
    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) 
    at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37) 
    at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44) 
    at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1346) 
    at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1285) 
    at com.example.hamira.wordmatchinggame.DataConn.getAllData(DataConn.java:38) 
    at com.example.hamira.wordmatchinggame.ingameinterface.hereWeGo(ingameinterface.java:167) 
    at com.example.hamira.wordmatchinggame.ingameinterface.onCreate(ingameinterface.java:37) 
    at android.app.Activity.performCreate(Activity.java:6135) 
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1112) 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2472) 
     ... 10 more 08-02 11:56:54.474 17223-17223/com.example.hamira.wordmatchinggame I/Process: Sending signal. PID: 17223 SIG: 9 

Answer 1

in Emulator, schob die Datenbank in Pfad/data/data. Das ist der Grund, warum es im Emulator funktioniert.

Aber in realen Gerät haben Sie die Datenbank nicht auf diesen Pfad geschoben.Deshalb sagt Crash "android.database.sqlite.SQLiteException: keine solche Tabelle".

PS:/Daten/Daten, ist ein gesicherter Pfad.Wenn Sie die Datenbank auf diesen Pfad verschieben möchten. Sie müssen etwas mehr Code schreiben.

Answer 2

in onCreate(SQLiteDatabase db) haben Sie Skript ausführen Datenbanktabelle (n) ex zu schaffen,

@Override 
public void onCreate(SQLiteDatabase db) { 
    db.execSQL("CREATE TABLE IF NOT EXISTS table1 (field1 VARCHAR,field2 VARCHAR);"); 
    db.execSQL("CREATE TABLE IF NOT EXISTS table2 (field1 VARCHAR,field2 VARCHAR);"); 
    //... etc 
} 

jetzt, nachdem Sie den richtigen hinzufügen create-Tabellenskript, deinstallieren App vom Gerät und das Projekt erneut aus. Es sollte die Tabellen erstellen und es wird gut funktionieren.

Sie müssen mehr über SQLite Helper-Klasse lesen und wie es funktioniert.