尝试在空对象引用上调用虚方法'boolean androidx.work.State.isFinished（）'

Question

我正在尝试使用codeLab文档学习WorkManager for Android。当我尝试测试beginUniqueWork（Ensure Unique Work）的功能时我崩溃了

我只需多次选择图像即可实现beginUniqueWork和测试应用程序。

我在ViewModel类中应用Blur（）编写的代码是：

  void applyBlur(int blurLevel) {


    WorkContinuation continuation = mWorkManager
            .beginUniqueWork(IMAGE_MANIPULATION_WORK_NAME,
                    ExistingWorkPolicy.REPLACE,
                    OneTimeWorkRequest.from(CleanupWorker.class));

    // Add WorkRequests to blur the image the number of times requested
    for (int i = 0; i < blurLevel; i++) {
        OneTimeWorkRequest.Builder blurBuilder =
                new OneTimeWorkRequest.Builder(BlurWorker.class);

        // Input the Uri if this is the first blur operation
        // After the first blur operation the input will be the output of previous
        // blur operations.
        if ( i == 0 ) {
            blurBuilder.setInputData(createInputDataForUri());
        }

        continuation = continuation.then(blurBuilder.build());
    }

    // Add WorkRequest to save the image to the filesystem
    OneTimeWorkRequest save =
            new OneTimeWorkRequest.Builder(SaveImageToFileWorker.class)
                    .build();
    continuation = continuation.then(save);

    continuation.enqueue();
}

Answer 1

这是https://issuetracker.google.com/79550068。它现在已修复，修复程序是在WorkManager的alpha02中的available，现在已经出来了。