無法打開數據庫android sqlite

嗨，我開始學習android我試過這段代碼。它顯示無法打開數據庫，以及我的路徑是否正確，如果它是錯誤的我如何創建。請誰能幫助無法打開數據庫android sqlite

  public class Sql3Activity extends Activity 
       { 


    public static final String TAG = "DatabaseHelper"; 

    public static final String DATABASE_NAME = "mydb"; 
    public static final String TRACKS_TABLE = "tracks"; 
    public static final String TRACK_INFO_TABLE = "track_info"; 

    public final String TRACKS_TABLE_CREATE = "create table " + TRACKS_TABLE 
      + " (_id integer primary key autoincrement, title text not null, description text null, created_at date not null);"; 

    public static final String TRACK_INFO_TABLE_CREATE = "create table " 
      + TRACK_INFO_TABLE 
      + " (_id integer primary key autoincrement, track_id integer not null, latitude real not null, longitude real not null, altitude real not null, created_at date not null);"; 


    public SQLiteDatabase database; 



@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_sql3); 

    final String DATABASE_FILE_PATH = Environment.getExternalStorageDirectory()+"/test"; 

    Toast.makeText(Sql3Activity .this,DATABASE_FILE_PATH,Toast.LENGTH_LONG).show(); 
    try{ 
    database = SQLiteDatabase.openDatabase(DATABASE_FILE_PATH + File.separator + DATABASE_NAME, null, SQLiteDatabase.OPEN_READWRITE); 
    Toast.makeText(Sql3Activity .this,"Database Open",Toast.LENGTH_LONG).show(); 
    }catch(Exception e) 
    { 
     Toast.makeText(Sql3Activity .this,"ERROR"+e,Toast.LENGTH_LONG).show(); 
    }

來源

2014-02-07 Vji

顯示異常的堆棧跟蹤'e' – Houssni

使用SQLiteOpenHelper與數據庫 –

表演工作你的日誌貓錯誤.. –

此代碼是工作。
首先，創建類擴展SQLiteOpenHelper和改變你的數據庫文件的路徑

class test extends SQLiteOpenHelper { 

    public test(Context context) { 
     super(context, "/sdcard/Download/123.db", null, SQLite.DATABASE_VERSION); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     // TODO Auto-generated method stub 

    } 

}

，並使用光標獲取數據

test t = new test(this); 
    Cursor cur = t.getWritableDatabase().rawQuery("SELECT * FROM COMPANY", null); 
    while (cur.moveToNext()) { 
     Log.i("chauster", ""+cur.getString(1)); 
    } 
cur.close(); 
t.close();

來源

2014-02-07 09:26:13 henry4343

爲了在外部存儲讀取或寫入文件，應用程序必須獲得READ_EXTERNAL_STORAGE或WRITE_EXTERNAL_STORAGE系統權限。

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

來源

2014-02-07 09:12:20

我是否提到了SD卡的確切路徑？ – Vji

無法打開數據庫android sqlite

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