title: Android: error opening database
body: <p>I've got this database taken from assets folder, but i can't open it in my activity.
  My database is stored in the assets folder and named <code>MIO_DATABASE.db</code> :</p>
  
  <p>Database.java:</p>
  
  <pre><code>package it.mi.action.app;
  
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import android.content.Context;
  import android.database.SQLException;
  import android.database.sqlite.SQLiteDatabase;
  import android.database.sqlite.SQLiteException;
  import android.database.sqlite.SQLiteOpenHelper;
  
  public class Database extends SQLiteOpenHelper{
  
  //The Android's default system path of your application database.
  private static final String DB_PATH = "/data/data/it.mi.action.app/databases/";
  private static final String DB_NAME = "MIO_DATABASE.db";
  private SQLiteDatabase myDataBase;
  private final Context myContext;
  
  public Database(Context context) {
      super(context, DB_NAME, null, 1);
      this.myContext = context;
  }   
  
  public void createDataBase() throws IOException{
      boolean dbExist = checkDataBase();
      if(dbExist){
          //do nothing - database already exist
      }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();
          } catch (IOException e) {
              throw new Error("Error copying database");
          }
      }
  }
  
  /**
    * Check if the database already exist to avoid re-copying the file each time you open the application.
    * @return true if it exists, false if it doesn't
    */
  private boolean checkDataBase(){
      SQLiteDatabase checkDB = null;
      try{
          String myPath = DB_PATH + DB_NAME;
          checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
      }catch(SQLiteException e){
          //database does't exist yet.
      }
      if(checkDB != null){
          checkDB.close();
      }
      return checkDB != null ? true : false;
  }
  
  /**
    * Copies your database from your local assets-folder to the just created empty database in the
    * system folder, from where it can be accessed and handled.
    * This is done by transfering bytestream.
    * */
  private void copyDataBase() throws IOException{
      //Open your local db as the input stream
      InputStream myInput = myContext.getAssets().open(DB_NAME);
      // Path to the just created empty db
      String outFileName = DB_PATH + DB_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))&gt;0){
          myOutput.write(buffer, 0, length);
      }
      //Close the streams
      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);
  }
  
  @Override
  public synchronized void close() {
      if(myDataBase != null)
          myDataBase.close();
      super.close();
  }
  
  @Override
  public void onCreate(SQLiteDatabase db) {
  }
  
  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { }
  
  // Add your public helper methods to access and get content from the database.
  // You could return cursors by doing "return myDataBase.query(....)" so it'd be easy
  // to you to create adapters for your views.
  
  }
  </code></pre>
  
  <p>my activity (mia.java) :</p>
  
  <pre><code>package it.mi.action.app;
  
     import java.io.IOException;
     import android.app.Activity;
     import android.database.SQLException;
     import android.os.Bundle;
  
     public class mia extends Activity{
     @Override
     public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mia);
        final Database info=new Database(this);
        try {
              info.createDataBase();
         } catch (IOException ioe) {
              throw new Error("Unable to create database");
         } 
         try {
              info.openDataBase();
         }catch(SQLException sqle){
              throw sqle;
         }
     }
  }
  </code></pre>
  
  <p>The app works, but in the LogCat i see this error:</p>
  
  <pre><code>08-01 09:37:32.772: E/Database(1774): sqlite3_open_v2("/data/data/it.mi.action.app/databases/MIO_DATABASE.db", &amp;handle, 1, NULL) failed
  </code></pre>
  
  <p>What's the problem?</p>