如何通过Workmanager定期发送随机通知？

Question

我可以每15分钟定期发送通知，但我不能改变通知的内容。我有一个字符串数组，workmanager总是发送相同的项目。例如，一开始它取值 "4"，它总是发送 "4"。

1 - 我在strings.xml中定义了一个字符串数组。

<string-array name="numbers">
    <item>one</item>
    <item>two</item>
    <item>three</item>
    <item>four</item>
    <item>five</item>
</string-array>

2 - 我的主活动类

public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
public static final String KEY_TASK_DESC = "key_task_desc";


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    String[] list = getResources().getStringArray(R.array.numbers);

    Random random = new Random();
    int number = random.nextInt(list.length);

    Data data = new Data.Builder()
            .putString(KEY_TASK_DESC, list[number]).build();

    PeriodicWorkRequest periodicWorkRequest = new PeriodicWorkRequest
            .Builder(MyWorker.class, 15, TimeUnit.MINUTE)
            .setInputData(data)
            .build();

    WorkManager.getInstance().enqueue(periodicWorkRequest);

}}

3 - 包含displayNotif(String inputData)方法的MyWorker类。

public class MyWorker extends Worker {

public MyWorker(@NonNull Context context, @NonNull WorkerParameters workerParams) {
    super(context, workerParams);
}

@NonNull
@Override
public Result doWork() {

    String inputData = getInputData().getString(MainActivity.KEY_TASK_DESC);
    displayNotif(inputData);

    return Result.success();
}

private void displayNotif(String inputData) {
    NotificationManager manager =
            (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

        NotificationChannel channel = new NotificationChannel("notif",
                "notif", NotificationManager.IMPORTANCE_DEFAULT);
        manager.createNotificationChannel(channel);
    }

    NotificationCompat.Builder builder = new NotificationCompat.Builder(getApplicationContext(), "notif")
            .setContentText(inputData)
            .setSmallIcon(R.mipmap.ic_launcher);

    manager.notify(1, builder.build());
}}

Answer 1

我想你可能是误解了你的意思。PeriodicWorkRequest 设置。

你只是在调用 setInputData 一次，有一个 data (你的字符串)。每次运行时，它仍然只有这个 data.

要随机显示一个字符串，你的随机选择必须发生在你的Worker's里面。doWork.