App se bloque au premier lancement android

J'ai une application qui lit dans une base de données de sqlite Database Browser puis il copie la base de données et procède. Cependant, chaque fois que je change la base de données dans sqlite Database Browser, je dois désinstaller et réinstaller l'application pour la recopier. (C'est juste pour une mission d'université) Au premier lancement, il se bloque toujours mais travaille ensuite sur la seconde. Y at-il de toute façon d'éviter cet accident ??App se bloque au premier lancement android

Voici une partie de mon code:

public DbH(Context context) throws IOException { 
    super(context, DB_NAME, null, 1); 
    this.mycontext = context; 
} 

public void createdatabase() throws IOException { 
    boolean dbexist = checkdatabase(); 
    if (dbexist) { 
     System.out.println(" Database exists."); 
    } else { 
     this.getReadableDatabase(); 
     try { 
      copydatabase(); 
     } catch (IOException e) { 
      throw new Error("Error copying database"); 
     } 
    } 
} 

private boolean checkdatabase() { 
    // SQLiteDatabase checkdb = null; 
    boolean checkdb = false; 
    try { 
     String myPath = DB_PATH + DB_NAME; 
     File dbfile = new File(myPath); 
     checkdb = SQLiteDatabase.openDatabase(myPath, null, 
       SQLiteDatabase.OPEN_READWRITE) != null; 
     checkdb = dbfile.exists(); 
    } catch (SQLiteException e) { 
     System.out.println("Database doesn't exist"); 
    } 

    return checkdb; 
} 

private void copydatabase() throws IOException { 

    InputStream myinput = mycontext.getAssets().open(DB_NAME); 
    String outfilename = DB_PATH + DB_NAME; 
    OutputStream myoutput = new FileOutputStream(outfilename); 

    byte[] buffer = new byte[1024]; 
    int length; 
    while ((length = myinput.read(buffer)) > 0) { 
     myoutput.write(buffer, 0, length); 
    } 

    myoutput.flush(); 
    myoutput.close(); 
    myinput.close(); 

} 

public void opendatabase() throws SQLException { 
    // Open the database 
    String mypath = DB_PATH + DB_NAME; 
    myDataBase = SQLiteDatabase.openDatabase(mypath, null, 
      SQLiteDatabase.OPEN_READONLY); 

} 

public synchronized void close() { 
    if (myDataBase != null) { 
     myDataBase.close(); 
    } 
    super.close(); 

}

Voici les erreurs dans le Logcat

04-01 22:24:55.909: E/SqliteDatabaseCpp(25335): DB info: sqlite3_open_v2("/data/data/com.example.databasebrowser/databases , key = T", &handle, 2,  NULL) failed 
    04-01 22:24:55.909: E/SqliteDatabaseCpp(25335): DB info: errno = 2, errno message = No such file or directory 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): Failed to open the database. closing it. 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): android.database.sqlite.SQLiteCantOpenDatabaseException: unable to open database file 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at android.database.sqlite.SQLiteDatabase.dbopen(Native Method) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1093) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1050) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1026) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at com.example.databasebrowser.DbH.checkdatabase(DbH.java:60) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at com.example.databasebrowser.DbH.createdatabase(DbH.java:41) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at com.example.databasebrowser.MyActivity.validateLogin(MyActivity.java:99) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at com.example.databasebrowser.MyActivity.onClick(MyActivity.java:66) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at android.view.View.performClick(View.java:3538) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at android.view.View$PerformClick.run(View.java:14330) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at android.os.Handler.handleCallback(Handler.java:608) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at android.os.Handler.dispatchMessage(Handler.java:92) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at android.os.Looper.loop(Looper.java:156) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at android.app.ActivityThread.main(ActivityThread.java:4977) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at java.lang.reflect.Method.invokeNative(Native Method) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at java.lang.reflect.Method.invoke(Method.java:511) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
    04-01 22:24:55.949: E/SQLiteDatabase(25335): at dalvik.system.NativeStart.main(Native Method) 
    04-01 22:24:56.450: E/SqliteDatabaseCpp(25335): SELECT locale FROM android_metadata failed 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): Failed to open the database. closing it. 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): android.database.sqlite.SQLiteException: no such table: android_metadata 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at android.database.sqlite.SQLiteDatabase.native_setLocale(Native Method) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at android.database.sqlite.SQLiteDatabase.setLocale(SQLiteDatabase.java:2186) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1094) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1050) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1026) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at com.example.databasebrowser.DbH.opendatabase(DbH.java:98) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at com.example.databasebrowser.MyActivity.validateLogin(MyActivity.java:105) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at com.example.databasebrowser.MyActivity.onClick(MyActivity.java:66) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at android.view.View.performClick(View.java:3538) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at android.view.View$PerformClick.run(View.java:14330) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at android.os.Handler.handleCallback(Handler.java:608) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at android.os.Handler.dispatchMessage(Handler.java:92) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at android.os.Looper.loop(Looper.java:156) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at android.app.ActivityThread.main(ActivityThread.java:4977) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at java.lang.reflect.Method.invokeNative(Native Method) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at java.lang.reflect.Method.invoke(Method.java:511) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
    04-01 22:24:56.470: E/SQLiteDatabase(25335): at dalvik.system.NativeStart.main(Native Method) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): FATAL EXCEPTION: main 
    04-01 22:24:56.480: E/AndroidRuntime(25335): android.database.sqlite.SQLiteException: no such table: android_metadata 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at android.database.sqlite.SQLiteDatabase.native_setLocale(Native Method) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at android.database.sqlite.SQLiteDatabase.setLocale(SQLiteDatabase.java:2186) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1094) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1050) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1026) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at com.example.databasebrowser.DbH.opendatabase(DbH.java:98) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at com.example.databasebrowser.MyActivity.validateLogin(MyActivity.java:105) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at com.example.databasebrowser.MyActivity.onClick(MyActivity.java:66) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at android.view.View.performClick(View.java:3538) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at android.view.View$PerformClick.run(View.java:14330) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at android.os.Handler.handleCallback(Handler.java:608) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at android.os.Handler.dispatchMessage(Handler.java:92) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at android.os.Looper.loop(Looper.java:156) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at android.app.ActivityThread.main(ActivityThread.java:4977) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at java.lang.reflect.Method.invokeNative(Native Method) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at java.lang.reflect.Method.invoke(Method.java:511) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
    04-01 22:24:56.480: E/AndroidRuntime(25335): at dalvik.system.NativeStart.main(Native Method)

Source

2013-04-01 una

pouvez-vous ajouter le [logcat] (http://developer.android.com/tools/help/logcat.html) à votre question? –

S'il vous plaît ajouter votre logcat, sans cela, nous ne pouvons pas vous aider. – Sajmon

Vous devriez apprendre à travailler avec un bloc catch. Pourquoi devriez-vous 'lancer une nouvelle erreur (" bla ")' quand vous avez déjà une 'IOException' avec plus de détails? Aussi: N'utilisez pas 'System.out.println()' sur Android, utilisez 'Log' et si vous enregistrez une erreur:' Log.e (TAG, "message", e); '(La seule exception est quand vous ne vous souciez vraiment pas de ce crash, que de ne pas vous connecter ... mais c'est plutôt rare ...) – WarrenFaith

Vous devez sous-classe SQLiteOpenHelper pour éviter les erreurs de création DB. Cela gère toute la création, la mise à jour et la vérification des problèmes d'existence, sans le faire vous-même. En outre, il créera le fichier DB dans le chemin recommandé par défaut.

Voici une classe d'aide ouverte DB que vous pouvez utiliser dans votre code.

class myDbHelper extends SQLiteOpenHelper { 
    public myDbHelper(Context context, String name, CursorFactory factory, 
      int version) { 
     super(context, name, factory, version); 
    } 

    // Called when no database exists on disk 
    @Override 
    public void onCreate(SQLiteDatabase _db) { 
     _db.execSQL(DATABASE_CREATE); 
    } 

    // Called when there is a database version mismatch meaning that 
    // the version of the database on disk needs to be upgraded to 
    // the current version. 
    @Override 
    public void onUpgrade(SQLiteDatabase _db, int _oldVersion, 
      int _newVersion) { 
     // Upgrade the existing database to conform to the new version. 
     _db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE); 
     // Create a new one. 
     onCreate(_db); 
    } 
}

Lars Vogel a un nice tutorial à ce sujet.

Source

2013-04-01 21:23:21 Moe

App se bloque au premier lancement android

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