android - 如何在 android 中将复杂类型的对象传递给 WorkManager。即列表、 map 、POJO

Question

WorkManager 是一个用于将工作排队的库，保证在满足其约束后执行。 WorkManager 允许观察工作状态并能够创建复杂的工作链。

支持的有效类型仅: bool 型、整数、长整型、 double 型、字符串以及每种类型的数组版本。

// Define the Worker class:
public class MathWorker extends Worker {

    // Define the parameter keys:
    public static final String KEY_X_ARG = "X";
    public static final String KEY_Y_ARG = "Y";
    public static final String KEY_Z_ARG = "Z";
    // ...and the result key:
    public static final String KEY_RESULT = "result";

    public MathWorker(
        @NonNull Context context,
        @NonNull WorkerParameters params) {
        super(context, params);
    }

    @Override
    public Worker.Result doWork() {
        // Fetch the arguments (and specify default values):
        int x = getInputData().getInt(KEY_X_ARG, 0);
        int y = getInputData().getInt(KEY_Y_ARG, 0);
        int z = getInputData().getInt(KEY_Z_ARG, 0);

        // ...do the math...
        int result = myCrazyMathFunction(x, y, z);

        //...set the output, and we're done!
        Data output = new Data.Builder()
            .putInt(KEY_RESULT, result)
            .build();
        setOutputData(output);
        return Result.SUCCESS;
    }
}

我如何传递复杂类型，例如:

Map<String, Object> studListMap = new HashMap<>();
        studListMap.put("list", studentDetails);

        // Create the Data object:
        @SuppressLint("RestrictedApi")
        Data myData = new Data.Builder()
                .put(KEY_STUD_LIST_ARG,studListMap)
                .build();

        //set network required
        Constraints myConstraints = new Constraints.Builder()
                .setRequiredNetworkType(NetworkType.CONNECTED)
                .build();

Answer 1

如果可能，您可以序列化您的 POJO。例如，如果它确实很小很简单，您可以使用 JSON 将其编码为字符串，然后在 Worker 中对其进行解码。

已使用 gson，因为它已经是此应用程序中的依赖项。

 Map<String, Object> studListMap = new HashMap<>();
        studListMap.put("list", studentDetails);

        Type listOfStudObject = new TypeToken<List<StudentDetails>>(){}.getType();
        String s = gson.toJson(studentDetails, listOfStudObject);

        // Create the Data object:
        @SuppressLint("RestrictedApi")
        Data myData = new Data.Builder()
                .putString(KEY_STUD_LIST_ARG,s)
                .build();

        //set network required
        Constraints myConstraints = new Constraints.Builder()
                .setRequiredNetworkType(NetworkType.CONNECTED)
                .build();

        // ...then create and enqueue a OneTimeWorkRequest that uses those arguments
        OneTimeWorkRequest attendWork = new OneTimeWorkRequest.Builder(AddAttendanceWorker.class)
                .setConstraints(myConstraints)
                .setInputData(myData)
                .build();

        WorkManager.getInstance()
                .enqueue(attendWork);