В эмуляторе приложение работает нормально. На устройстве в тот момент, когда я пытаюсь скопировать мою базу данных поверх базы данных приложения и выполнить запрос, приложение закрывается. Есть идеи, почему это может происходить? Нужно ли запрашивать какие-либо разрешения или что-то в манифесте для его запуска?
Database.Java
public class Database extends SQLiteOpenHelper{
//The Android's default system path of your application database.
private static String DB_PATH = "/data/data/gr.BHC.www/databases/";
//Name of the Database to be created.
private static String DB_NAME = "BHCLibrary3.sqlite";
private SQLiteDatabase myDataBase;
private final Context myContext;
* Constructor
* Takes and keeps a reference of the passed context in order to access to the application assets and resources.
* @param context
*/
public Database(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
}
/**
* Creates a empty database on the system and rewrites it with your own database.
* */
public void createDataBase() throws IOException{
//First we check if the database already exists, Method declared later
boolean dbExist = checkDataBase();
if(dbExist){
//do nothing - database already exists
}else{
//By calling this method an empty database will be created into the default system path
//of your application so we are going to be able to overwrite that database with our database.
this.getReadableDatabase();
try {
copyDataBase(); //Method declared later
} 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;
boolean checkdb = false;
try{
String myPath = DB_PATH + DB_NAME;
File dbfile = new File(myPath);
//checkdb = SQLiteDatabase.openDatabase(myPath,null,SQLiteDatabase.OPEN_READWRITE);
checkdb = dbfile.exists();
}
catch(SQLiteException e){
System.out.println("Database doesn't exist");
}
return checkdb;
}
/**
* 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 transferring byte stream.
* */
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))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
//Opening the Database
public void openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
}
//Finally overriding a few methods as required
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
//First we check if the database already exists, Method declared later
boolean dbExist = checkDataBase();
if(dbExist){
//do nothing - database already exists
}else{
//By calling this method an empty database will be created into the default system path
//of your application so we are going to be able to overwrite that database with our database.
this.getReadableDatabase();
try {
copyDataBase(); //Method declared later
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
И Results.java (Активность, в которой я выполняю свой запрос)
public class SearchResults extends ListActivity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.searchresults);
Database myDbHelper = new Database(null);
myDbHelper = new Database(this);
}
// Get the intent, verify the action and get the query
Intent intent = getIntent();
String query = intent.getStringExtra(SearchManager.QUERY);
SQLiteDatabase myDb = myDbHelper.getReadableDatabase();
//Executing our query against the server using rawQuery and getting the cursor
String select="SELECT DISTINCT b._ISBN as _id, b.BookTitle, b.Edition, b.Year, b.Pages, b.Rating, c.Category, p.Publisher, w.LastName" +
" FROM" +
" Books b" +
" JOIN Categories_Books cb ON cb._Books_ISBN = _id" +
" JOIN Categories c ON c._CategoryID = cb._Categories_CategoryID" +
" JOIN Publishers p ON p._PublisherID = b.PublisherID" +
" JOIN Writers_Books wb ON wb._Books_ISBN = _id" +
" JOIN Writers w ON w._WriterID = wb._Writers_WriterID" +
" WHERE b.BookTitle LIKE '%" + query +"%'" +
" OR c.Category LIKE '%" + query +"%'" +
" OR p.Publisher LIKE '%" + query +"%'" +
" OR w.LastName LIKE '%" + query +"%'" +
" OR _id LIKE '%" + query +"%'" +
" GROUP BY b.BookTitle";
Cursor c = myDb.rawQuery(select, null);
startManagingCursor(c);
// the desired columns to be bound
String[] columns = new String[] { "Books.BookTitle", "Publishers.Publisher" };
// the XML defined views which the data will be bound to
int[] to = new int[] { R.id.ISBN_entry, R.id.Title_entry };
//Getting results into our listview
try
{
SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, R.layout.listlayout, c, columns, to);
this.setListAdapter(mAdapter);
}
catch( Exception e)
{
}
}
}
Помощь будет оценена.
РЕДАКТИРОВАТЬ: Ошибка, которую я получаю: java.lang.runtimeexception: Невозможно запустить действие Componentinfo (gr.BHC.www / gr.BHC.www.SearchResults}, а затем различные исключения, говорящие таблицы книг и т. Д. Не существует.
EDIT2: я видел исключение, которое я обычно связывал с контент-провайдерами, но до сих пор не могу понять, почему я это получил.