应用程序因 WorkManager 而崩溃

Question

最近我在尝试测试 WorkManager，但遇到了一个我不知道如何解决的错误...

我遇到的错误是：

2018-06-16 16:36:36.594 23798-23815/? E/AndroidRuntime: FATAL EXCEPTION: pool-2-thread-1
Process: com.example.damiii.myjobintentservice, PID: 23798
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
    at androidx.room.RoomOpenHelper.checkIdentity(RoomOpenHelper.java:135)
    at androidx.room.RoomOpenHelper.onOpen(RoomOpenHelper.java:116)
    at androidx.sqlite.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.onOpen(FrameworkSQLiteOpenHelper.java:150)
    at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:409)
    at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:298)
    at androidx.sqlite.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.getWritableSupportDatabase(FrameworkSQLiteOpenHelper.java:97)
    at androidx.sqlite.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.java:55)
    at androidx.room.RoomDatabase.beginTransaction(RoomDatabase.java:253)
    at androidx.work.impl.utils.EnqueueRunnable.addToDatabase(EnqueueRunnable.java:93)
    at androidx.work.impl.utils.EnqueueRunnable.run(EnqueueRunnable.java:79)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    at java.lang.Thread.run(Thread.java:764)

我检查了哪里可能会出现此错误，似乎当我对该代码添加注释时：

        //WorkRequest can be customised for backoff criteria
    OneTimeWorkRequest checkOfflineNetworkState = new OneTimeWorkRequest.Builder(NoNetworkWorker.class).setConstraints(mConstraints).build();

    WorkManager.getInstance().enqueue(checkOfflineNetworkState);

我的应用程序运行良好... 我不知道问题是来自 WorkManager 还是我所做的实施...

这是我的项目信息：

minSDKversion : 14

targetSDKversion : 28

我的 gradle.build :

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.0.0-alpha1'
//    implementation "com.android.support:appcompat-v7:28.0.0"
//    implementation 'com.android.support:support-v4:28.0.0'
implementation 'androidx.legacy:legacy-support-v4:1.0.0-alpha3'
implementation "android.arch.work:work-runtime:1.0.0-alpha02"
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.1.0-alpha3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha3'
}

有人帮我吗？谢谢 :)

P.S.: 这是来自 NoNetworkWorker 的代码:

package com.example.damiii.myjobintentservice;

import android.util.Log;

import androidx.work.Worker;

public class NoNetworkWorker extends Worker {


/**
 * Override this method to do your actual background processing.
 *
 * @return The result of the work, corresponding to a {@link WorkerResult} value.  If a
 * different value is returned, the result shall be defaulted to
 * {@link WorkerResult#FAILURE}.
 */
@Override
public WorkerResult doWork() {

    Log.d("Hello", "I'm offline :D");

    return WorkerResult.SUCCESS;
}
}

Answer 1

此问题将在下一个 AndroidX 版本的 Room 中得到解决。

来源：https://issuetracker.google.com/issues/110100403

Answer 2

更新到 WorkManager 版本 1.0.0-alpha03

应用程序因 WorkManager 而崩溃

Application crashing with WorkManager

android

android-workmanager

androidx