如何使用Android Work Manager监听屏幕解锁事件（android.intent.action.USER_PRESENT）

Work Manager本身没有内置触发器直接监听android.intent.action.USER_PRESENT这类系统广播，需结合动态注册的BroadcastReceiver触发Work Request，具体实现步骤如下：

1. 创建Worker类 #

定义继承自Worker的类，处理解锁后的任务逻辑：

public class UnlockScreenWorker extends Worker {
    public UnlockScreenWorker(@NonNull Context context, @NonNull WorkerParameters workerParams) {
        super(context, workerParams);
    }

    @NonNull
    @Override
    public Result doWork() {
        // 此处编写屏幕解锁后需执行的任务
        Log.d("UnlockWorker", "屏幕解锁，执行任务");
        return Result.success();
    }
}

2. 实现动态注册的BroadcastReceiver #

创建BroadcastReceiver，收到USER_PRESENT广播时提交Work Request到Work Manager：

public class UnlockScreenReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (Intent.ACTION_USER_PRESENT.equals(intent.getAction())) {
            // 构建单次执行的Work Request
            OneTimeWorkRequest workRequest = new OneTimeWorkRequest.Builder(UnlockScreenWorker.class)
                    .build();
            
            // 提交任务至Work Manager
            WorkManager.getInstance(context).enqueue(workRequest);
        }
    }
}

3. 在组件中注册/注销Receiver #

因Android 8.0+禁止静态注册USER_PRESENT这类隐式广播，需在Activity或前台服务中动态注册，示例以主Activity为例：

public class MainActivity extends AppCompatActivity {
    private UnlockScreenReceiver unlockReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        // 初始化并注册Receiver
        unlockReceiver = new UnlockScreenReceiver();
        IntentFilter filter = new IntentFilter(Intent.ACTION_USER_PRESENT);
        registerReceiver(unlockReceiver, filter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 注销Receiver，避免内存泄漏
        unregisterReceiver(unlockReceiver);
    }
}

关键注意事项 #

• Android 8.0+仅支持动态注册USER_PRESENT广播，静态注册无效。
• 若需应用后台仍能监听解锁事件，需将Receiver注册在前台服务中，否则应用后台被系统回收后Receiver会失效。
• 使用OneTimeWorkRequest可确保任务在应用重启后未完成的情况下仍能可靠执行。

内容的提问来源于stack exchange，提问作者Stefan