我正在使用从 AlarmManager 接收广播的 BroadcastReceiver。在接收器中，我开始了两项 Activity 。一个 Activity 是从这样的 URI 开始的，并且是第三方应用程序:

// Open spotify
Intent spotify = new Intent(Intent.ACTION_VIEW, Uri.parse(song));
spotify.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

try {
    context.startActivity(spotify);
} catch (ActivityNotFoundException e) {
    status = Status.SPOTIFY_NOT_INSTALLED;
}

之后，我再次使用 AlarmManager 启动属于应用程序的另一个 Activity ，延迟 5 秒:

public static void setExact(
        Context context, PendingIntent pendingIntent, long time
) {

    AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
        am.setExact(AlarmManager.RTC_WAKEUP, time, pendingIntent);
    else
        am.set(AlarmManager.RTC_WAKEUP, time, pendingIntent);

}

public static void setExactDelay(
        Context context, PendingIntent pendingIntent, long delay
) {
    setExact(context, pendingIntent, System.currentTimeMillis() + delay);
}

    PendingIntent pendingIntent = AlarmPlayActivity.makePendingIntent(context, alarm, status, startTime);
    AlarmSet.setExactDelay(context, pendingIntent, 5000);

第二个 Activity 按预期在 5 秒后开始。但是，第一个 Activity 仅在设备解锁时开始。如果设备被锁定，它不会在 Android Nougat (7.0) 上启动。即使锁不受密码、图案等保护，情况也是如此。这曾经适用于早期的 Android 版本，即使使用安全锁也是如此。

有没有一种方法可以在不需要屏幕打开的情况下启动第一个 Activity ？

编辑:我尝试使用以下 IntentService。它在设备唤醒和解锁时有效，但在设备锁定时没有运气:

public class AlarmService extends IntentService {

    static final int NOTIFICATION_ID = 1;

    public AlarmService() {
        super("AlarmService");
    }

    public static Intent makeIntent(Context context, Alarm alarm, AlarmReceiver.Status status, long startTime) {

        Intent intent = IntentFactory.alarmPlayIntent(alarm, status, startTime);
        intent.setClass(context, AlarmService.class);

        return intent;

    }

    private static void sleep(long time) {
        try {
            Thread.sleep(time);
        } catch (InterruptedException e) {
            // Nothing
        }
    }

    @Override
    protected void onHandleIntent(Intent intent) {

        // Acquire Wakelock immediately

        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);

        PowerManager.WakeLock wakeLock = pm.newWakeLock(
                PowerManager.FULL_WAKE_LOCK |
                PowerManager.ACQUIRE_CAUSES_WAKEUP |
                PowerManager.ON_AFTER_RELEASE,
                "AlarmServiceWakeLock"
        );

        wakeLock.acquire();

        KeyguardManager.KeyguardLock lock = ((KeyguardManager) getSystemService(Activity.KEYGUARD_SERVICE)).newKeyguardLock(KEYGUARD_SERVICE);
        lock.disableKeyguard();

        // Get intent data

        final Alarm alarm = IntentFactory.getAlarm(intent);
        AlarmReceiver.Status status = IntentFactory.getStatus(intent);
        final long startTime = IntentFactory.getStartTime(intent, 0);

        // Get a random song for this alarm

        AlarmDatabase db = AlarmDatabase.getInstance(this);
        Song song = db.getRandomSong(alarm);

        String songName = song == null ? "backup sound" : song.getName();

        // Start a foreground notification

        Notification notification = new NotificationCompat.Builder(this)
                .setContentTitle(getText(R.string.alarm_starting_notification_title))
                .setContentText(getString(
                        R.string.alarm_starting_notification_message, alarm.getName(), songName
                ))
                .setSmallIcon(R.drawable.ic_launcher)
                .setPriority(NotificationCompat.PRIORITY_MAX)
                .build();

        startForeground(NOTIFICATION_ID, notification);

        // Potentially open Spotify if we can

        if (song != null) {

            // Open spotify

            Intent spotify = new Intent(Intent.ACTION_VIEW, Uri.parse(song.getUri()));
            spotify.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);

            try {
                startActivity(spotify);
            } catch (ActivityNotFoundException e) {
                status = AlarmReceiver.Status.SPOTIFY_NOT_INSTALLED;
            }

        } else
            status = AlarmReceiver.Status.NO_SONGS;

        // Start play activity in 10 seconds, giving Spotify some chance to load up.

        sleep(10);
        startActivity(AlarmPlayActivity.makeIntent(this, alarm, status, startTime));

        // Keep alive for 5 more seconds
        sleep(5);

        // Stop notification
        stopForeground(true);

        // Release wakelock
        wakeLock.release();


    }

}

最佳答案

我遇到了同样的问题，我认为出于安全原因，Intent.ACTION_VIEW 在您解锁屏幕之前不会工作。

讨论了相同的问题 here还。你也可以查看这个 link

关于android - Android Nougat 锁屏中 URI 的 startActivity，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41152725/