Question

我是Android App开发的新手。我正在学习Sqlite并遇到问题。我正在尝试使用Room从SQLite数据库检索数据，并发现“数据库打开失败”错误。日志说：

2018-10-30 11:30:18.261 2615-2629/? E/JavaBinder: *** Uncaught remote exception!  (Exceptions are not yet supported across processes.)
java.lang.RuntimeException: database open failed
    at com.cleanmaster.provider.DatebaseProvider.a(DatebaseProvider.java:357)
    at com.cleanmaster.provider.DatebaseProvider.query(DatebaseProvider.java:297)
    at android.content.ContentProvider.query(ContentProvider.java:1028)
    at android.content.ContentProvider$Transport.query(ContentProvider.java:239)
    at android.content.ContentProviderNative.onTransact(ContentProviderNative.java:112)
    at android.os.Binder.execTransact(Binder.java:567)

我的AppDatabase.class

package com.impresscapital.iclapp.database;


import android.arch.persistence.room.Database;
import android.arch.persistence.room.Room;
import android.arch.persistence.room.RoomDatabase;
import android.arch.persistence.room.TypeConverter;
import android.arch.persistence.room.TypeConverters;
import android.content.Context;
import android.util.Log;

import com.impresscapital.iclapp.dao.UserDao;
import com.impresscapital.iclapp.dbobj.User;
import com.impresscapital.iclapp.util.DateConverter;

@Database(entities = {User.class},version = 1, exportSchema = false)
@TypeConverters({DateConverter.class})
public abstract class AppDatabase extends RoomDatabase {

    private static final String LOG_CAT=AppDatabase.class.getSimpleName();
    private static final Object LOCK=new Object();
    private static final String DATABASE_NAME="db_icl_app";
    private static AppDatabase sInstance;

    public static AppDatabase getInstance(Context context){
        if(sInstance==null){
            synchronized (LOCK){
                Log.d(LOG_CAT,"Creating new Database");
                sInstance=Room.databaseBuilder(context.getApplicationContext(),
                        AppDatabase.class,AppDatabase.DATABASE_NAME).build();

            }

        }
        Log.d(LOG_CAT,"Getting the database instance");
        return sInstance;
    }

    public abstract UserDao userDao();
}

我要从中访问数据库的类是UserSigninAuthentication.class。这是代码

package com.impresscapital.iclapp.util;

import android.content.Context;
import android.util.Log;

import com.impresscapital.iclapp.database.AppDatabase;
import com.impresscapital.iclapp.database.AppExecutors;
import com.impresscapital.iclapp.dbobj.User;

import java.util.List;

public class UserSigninAuthentication {

    private Boolean isAuthenticate=false;

    public boolean authenticate(final String username, final String password, Context context, final AppDatabase mDb){
        AppExecutors.getsInstance().getDiskIO().execute(new Runnable() {
            @Override
            public void run() {
                List<User> user=mDb.userDao().loadUser(username,password);
                if(user.size()==1){
                    isAuthenticate=true;
                }
                Log.d("IsAuthenticate Value",isAuthenticate.toString());
            }
        });
        return isAuthenticate;
    }



}

UserDao.class

package com.impresscapital.iclapp.dao;

import android.arch.persistence.room.Dao;
import android.arch.persistence.room.Delete;
import android.arch.persistence.room.Insert;
import android.arch.persistence.room.Query;
import android.arch.persistence.room.Update;

import com.impresscapital.iclapp.dbobj.User;

import java.util.List;

@Dao
public interface UserDao {


    @Query("Select * from user_table where username like :inputUserame and password like :inputPassword LIMIT 1")
    List<User> loadUser(String inputUserame,String inputPassword);

    @Query("Select * from user_table")
    List<User> retrieveAllUser();
    @Insert
    void registerUser(User user);

    @Update
    void updateUser(User user);

    @Delete
    void deleteUser(User user);
}

要添加的一个重要点。我正在调试应用程序。下一行的执行功能未执行。

AppExecutors.getsInstance().getDiskIO().execute(new Runnable() {..

感谢您提前帮助我。

java.lang.RuntimeException：在Android Room中数据库打开失败

0 个答案: