我想在应用程序启动时从服务器下载某些文件。所以我尝试使用从我的自定义 Application 类中排队的 Work Manager。但是 Worker 类没有被触发并且状态只是 ENQUEUED 并且不会进入 RUNNING .以下是我的代码:
应用类:
@Override
public void onCreate() {
Constraints constraints = new Constraints.Builder()
.setRequiredNetworkType(NetworkType.CONNECTED)
//.setRequiresStorageNotLow(true)
//.setRequiresBatteryNotLow(true)
.build();
OneTimeWorkRequest request = new OneTimeWorkRequest
.Builder(MyWorker.class)
//.setConstraints(constraints)
//.setInitialDelay(1,TimeUnit.SECONDS)
.addTag("download")
.build();
WorkManager.getInstance(getApplicationContext()).getWorkInfoByIdLiveData(request.getId()).observeForever(new Observer<WorkInfo>() {
@Override
public void onChanged(WorkInfo workInfo) {
if (workInfo == null) {
Log.d("download", "workInfo == null");
} else {
Log.d("download", "workInfo != null: " + workInfo.getState().toString());//This is giving ENQUEUED once..thats it
}
}
});
WorkManager.getInstance(getApplicationContext()).enqueue(request);
}
MyWorker 类
public class MyWorker extends Worker {
public MyWorker(@NonNull Context context, @NonNull WorkerParameters workerParams) {
super(context, workerParams);
}
@NonNull
@Override
public Result doWork() {
//Some file to download
}
}
构建.gradle:
implementation "androidx.work:work-runtime:2.3.2"
我尝试过的事情:
我尝试添加一个间隔并删除约束,但也没有触发 MyWorker。
我看过很多 SOF 帖子,如下所示,但对我没有帮助: