錯誤與Android工作室打開SQLite數據庫

Question

我可以知道爲什麼當我運行這個項目它出了這個錯誤和設備上的應用程序是不幸的，應用程序已停止。錯誤是。 android.database.sqlite.SQLiteCantOpenDatabaseException：未知錯誤（代碼14）：無法打開數據庫

package dijkstra.app.com.demodistancev8; 

import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 

import android.content.Context; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteException; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.util.Log; 
import android.widget.Toast; 

//http://cariprogram.blogspot.com 

public class SQLHelper extends SQLiteOpenHelper{ 

private static final String DATABASE_NAME = "schoolnav.sqlite"; 
private static final int DATABASE_VERSION = 1; 
private static String DB_PATH = "/data/data/com.app.dijkstra/databases/"; 
private Context myContext; 

public SQLHelper(Context context) { 
    super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    // TODO Auto-generated constructor stub 
    myContext=context; 
} 

public void createDataBase() throws IOException{ 
    if(DataBaseisExist()){ 
     //do nothing - database already exist 
     Toast.makeText(myContext, "Database Sudah Ada", Toast.LENGTH_LONG).show(); 
    } 
    else{ 
     //By calling this method and empty database will be created into the default system path 
      //of your application so we are gonna be able to overwrite that database with our database. 
     this.getReadableDatabase(); 

     try { 
      copyDataBase(); 
      Toast.makeText(myContext, "Database Berhasil Diimport Dari Assets", Toast.LENGTH_LONG).show(); 
     } catch (IOException e) { 
      throw new Error("Error copying database"); 
     } 
    } 

} 

private boolean DataBaseisExist(){ 
    SQLiteDatabase checkDB = null; 
    try{ 
     String myPath = DB_PATH + DATABASE_NAME; 
     checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY); 

    }catch(SQLiteException e){ 
     //database does't exist yet. 
    } 
    if(checkDB != null){ 
     checkDB.close(); 
    } 
    if(checkDB != null)return true ;else return false; 
} 

private void copyDataBase() throws IOException{ 
    //Open your local db as the input stream 
    InputStream myInput = myContext.getAssets().open(DATABASE_NAME); 
    // Path to the just created empty db 
    String outFileName = DB_PATH + DATABASE_NAME; 
    //Open the empty db as the output stream 
    OutputStream myOutput = new FileOutputStream(outFileName); 
    //transfer bytes from the inputfile to the outputfile 
    byte[] buffer = new byte[1024]; 
    int length; 
    while ((length = myInput.read(buffer))>0){ 
     myOutput.write(buffer, 0, length); 
    } 
    //Close the streams 
    myOutput.flush(); 
    myOutput.close(); 
    myInput.close(); 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 

} 

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

} 
}} 


<?xml version="1.0" encoding="utf-8"?> 

<permission android:name="dijkstra.app.com.demodistancev8.permission.MAPS_RECEIVE" 
    android:protectionLevel="signature"></permission> 
<uses-permission android:name="dijkstra.app.com.demodistancev8.permission.MAPS_RECEIVE"/> 
<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 
<uses-permission  android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" /> 
<uses-permission android:name="android.permission.READ_PHONE_STATE" /> 
<uses-permission android:name="android.permission.SEND_SMS" /> 
<!-- 
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use 
    Google Maps Android API v2, but are recommended. 
--> 
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 

<application 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <meta-data 
     android:name="com.google.android.gms.version" 
     android:value="@integer/google_play_services_version" /> 

    <meta-data 
     android:name="com.google.android.maps.v2.API_KEY" 
     android:value="@string/google_maps_key" /> 

    <activity 
     android:name=".MapsActivity" 
     android:label="@string/title_activity_maps" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
</application> 

</manifest> 

Answer 1

爲了安全地從資產的數據複製到應用程序數據文件夾，你可以試試下面的代碼：

String appDataDir = ContextWrapper.getFilesDir(); 

String copyDBPath = appDataDir + "/" + DATABASE_NAME; 

Answer 2

只是不使用硬編碼路徑，我的sqlite沒有路徑工作。 我的代碼：

public class PoiDbOpenHelper extends SQLiteOpenHelper { 

    private static final int DATABASE_VERSION = 4; 
    private static final String DATABASE_NAME = "pois.db"; 

    public static final String TABLE_POI = "tblpoi"; 
    public static final String TABLE_SQLITE_SEQUENCE = "sqlite_sequence"; 

    public static final String COLUMN_ID = "_id"; 
    public static final String COLUMN_LAT = "latitude"; 
    public static final String COLUMN_LNG = "longitude"; 
    public static final String COLUMN_NAME = "name"; 
    public static final String COLUMN_CITY = "city"; 

    public static final String CREATE_TABLE_POI = "create table " 
      + TABLE_POI + "(" 
      + COLUMN_ID + " integer primary key autoincrement, " 
      + COLUMN_LAT + " real not null, " 
      + COLUMN_LNG + " real not null, " 
      + COLUMN_NAME + " text not null, " 
      + COLUMN_CITY + " text not null " 
      + ");"; 
    ...