android.database.sqlite.SQLiteDatabaseLockedException: database is locked (code 5)问题解决

//忘记原作者连接，请见谅。

public class DatabaseManager {

    private AtomicInteger mOpenCounter = new AtomicInteger();


    private static DatabaseManager instance;
    private static SQLiteOpenHelper mDatabaseHelper;
    private SQLiteDatabase mDatabase;

//初始化
    public static synchronized void initializeInstance(SQLiteOpenHelper helper) {
        if (instance == null) {
            synchronized (DatabaseManager.class) {
                if (null == instance) {
                    instance = new DatabaseManager();
                    mDatabaseHelper = helper;
                }
            }
        }
    }


    public static synchronized DatabaseManager getInstance() {
        if (instance == null) {
            throw new IllegalStateException(DatabaseManager.class.getSimpleName() +
                    " is not initialized, call initializeInstance(..) method first.");
        }
        return instance;
    }

//写
    public synchronized SQLiteDatabase openWritableDatabase() {
        if(mOpenCounter.incrementAndGet() == 1) {
            mDatabase = mDatabaseHelper.getWritableDatabase();
        }
        return mDatabase;

    }

//读

    public synchronized SQLiteDatabase getReadableDatabase() {
        if(mOpenCounter.incrementAndGet() == 1) {
            // Opening new database
            mDatabase = mDatabaseHelper.getReadableDatabase();
        }
        return mDatabase;
    }



//同步关闭
    public synchronized void close() {
        if(mOpenCounter.decrementAndGet() == 0) {
            mDatabase.close();
        }
    }

//强制真正的关闭
    public synchronized void trueClose() {
        mDatabase.close();
    }

}

用法：在myapplication调用初始化：

DatabaseManager.initializeInstance(new DBHelper(this));