我已經寫了創建數據庫的代碼,我得到ERROR/AndroidRuntime(7193):在com.android.xont.db.DataBaseHelper.createDataBase(DataBaseHelper.java:43)Android數據庫創建錯誤。
這是我的代碼:
public class DataBaseHelper extends SQLiteOpenHelper {
private static String DB_PATH = "/data/data/com.android.xont.controller/databases/";
private static String DB_NAME = "DEMOUserVentura_HEMA.db";
private SQLiteDatabase DEMOUserVentura_HEMA;
private final Context myContext;
private DataBaseHelper myDbHelper;
public DataBaseHelper(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 {
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
this.getReadableDatabase().close();
//this.getReadableDatabase().getPath();
//System.out.println(" ===== " + this.getReadableDatabase().getPath());
try {
copyDataBase();
} catch (IOException e) {
throw new Error(e);
}
}
}
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;
}
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();
}
public void openDataBase() throws SQLException {
// Open the database
String myPath = DB_PATH + DB_NAME;
DEMOUserVentura_HEMA = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if (DEMOUserVentura_HEMA != null)
DEMOUserVentura_HEMA.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
當我打電話給這個活動時,我得到一個異常。我的數據庫大小是:4.55MB。
當我打印getReadableDatabase()。getPath(),這是正確返回數據庫路徑。
請幫我一把。我一直在拉我的頭髮一個星期。
當我運行模擬器時,它會複製少量的文件。並非全部。然後我做了手動方式複製。
現在的問題是HTC手機。如何解決這個例外。請幫幫我。
在此先感謝..
感謝您的鏈接。那是什麼createNewFile()方法?你有完整的源代碼嗎? – Piraba
查看關於示例代碼的編輯 – thaussma
如果我們使用android 2.3.3,那麼我們不需要做大塊? – Piraba