android workmanager怎樣設(shè)置任務(wù)約束

小樊
81
2024-11-16 21:53:56

在Android WorkManager中，設(shè)置任務(wù)約束是為了確保任務(wù)在滿足特定條件時(shí)才會(huì)執(zhí)行。以下是一些常見(jiàn)的任務(wù)約束：

  1. 網(wǎng)絡(luò)連接：使用NetworkTypeConstraint來(lái)限制任務(wù)僅在滿足特定網(wǎng)絡(luò)類型時(shí)執(zhí)行。例如，只允許在Wi-Fi連接時(shí)執(zhí)行任務(wù)。
NetworkTypeConstraint networkTypeConstraint = new NetworkTypeConstraint.Builder()
        .setRequiredNetworkType(NetworkType.WIFI)
        .build();
OneTimeWorkRequest request = new OneTimeWorkRequest.Builder(MyWorker.class)
        .addConstraint(networkTypeConstraint)
        .build();
WorkManager.getInstance(context).enqueue(request);
  1. 電池電量：使用BatteryLevelConstraint來(lái)限制任務(wù)僅在電池電量達(dá)到特定百分比時(shí)執(zhí)行。例如，只允許在電池電量大于20%時(shí)執(zhí)行任務(wù)。
BatteryLevelConstraint batteryLevelConstraint = new BatteryLevelConstraint.Builder()
        .setMinLevel(20)
        .build();
OneTimeWorkRequest request = new OneTimeWorkRequest.Builder(MyWorker.class)
        .addConstraint(batteryLevelConstraint)
        .build();
WorkManager.getInstance(context).enqueue(request);
  1. 存儲(chǔ)空間：使用StorageLevelConstraint來(lái)限制任務(wù)僅在滿足特定存儲(chǔ)空間條件時(shí)執(zhí)行。例如，只允許在存儲(chǔ)空間大于100MB時(shí)執(zhí)行任務(wù)。
StorageLevelConstraint storageLevelConstraint = new StorageLevelConstraint.Builder()
        .setRequiredFreeSpaceBytes(100 * 1024 * 1024)
        .build();
OneTimeWorkRequest request = new OneTimeWorkRequest.Builder(MyWorker.class)
        .addConstraint(storageLevelConstraint)
        .build();
WorkManager.getInstance(context).enqueue(request);
  1. 綁定到特定設(shè)備：使用DeviceConstraint來(lái)限制任務(wù)僅在特定設(shè)備上執(zhí)行。例如，只允許在特定設(shè)備上執(zhí)行任務(wù)。
DeviceConstraint deviceConstraint = new DeviceConstraint.Builder()
        .setDeviceIds(Arrays.asList("device_id"))
        .build();
OneTimeWorkRequest request = new OneTimeWorkRequest.Builder(MyWorker.class)
        .addConstraint(deviceConstraint)
        .build();
WorkManager.getInstance(context).enqueue(request);

這些約束可以單獨(dú)使用，也可以組合使用。例如，要確保任務(wù)在滿足Wi-Fi連接和電池電量大于20%時(shí)才執(zhí)行，可以將上述約束組合在一起：

NetworkTypeConstraint networkTypeConstraint = new NetworkTypeConstraint.Builder()
        .setRequiredNetworkType(NetworkType.WIFI)
        .build();
BatteryLevelConstraint batteryLevelConstraint = new BatteryLevelConstraint.Builder()
        .setMinLevel(20)
        .build();
OneTimeWorkRequest request = new OneTimeWorkRequest.Builder(MyWorker.class)
        .addConstraint(networkTypeConstraint)
        .addConstraint(batteryLevelConstraint)
        .build();
WorkManager.getInstance(context).enqueue(request);

通過(guò)這些約束，您可以更好地控制WorkManager任務(wù)的執(zhí)行條件。

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