Question

我想在重新启动设备后启动Service，我写下面的代码，但重启设备无法启动Service。
的清单：

<activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".alarm1.alarm1"></activity>

        <receiver android:name=".alarm1.AlarmReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
            </intent-filter>
        </receiver>

        <!-- Will not be called unless the application explicitly enables it -->
        <receiver android:name=".alarm1.DeviceBootReceiver"
            android:enabled="false">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
            </intent-filter>
        </receiver>

活动代码：

public class alarm1 extends AppCompatActivity {

    private PendingIntent pendingIntent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_alarm1);

            /* Retrieve a PendingIntent that will perform a broadcast */
        Intent alarmIntent = new Intent(getApplicationContext(), AlarmReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, alarmIntent, 0);

        findViewById(R.id.startAlarm).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                start();
            }
        });

        findViewById(R.id.stopAlarm).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                cancel();
            }
        });

        findViewById(R.id.stopAlarmAt10).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startAt10();
            }
        });
    }

    public void start() {
        AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        int interval = 8000;

        manager.setInexactRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), interval, pendingIntent);
        Toast.makeText(this, "Alarm Set", Toast.LENGTH_SHORT).show();
    }

    public void cancel() {
        AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        manager.cancel(pendingIntent);
        Toast.makeText(this, "Alarm Canceled", Toast.LENGTH_SHORT).show();
    }

    public void startAt10() {
        AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        int interval = 1000 * 60 * 20;

        /* Set the alarm to start at 10:30 AM */
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.set(Calendar.HOUR_OF_DAY, 17);
        calendar.set(Calendar.MINUTE, 15);

        Toast.makeText(alarm1.this, "Start at 17:11", Toast.LENGTH_SHORT).show();

        /* Repeating on every 20 minutes interval */
        manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                1000 * 60 * 3, pendingIntent);
    }
}

AlarmReceiver代码：

public class AlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        // For our recurring task, we'll just display a message
        Toast.makeText(context, "I'm running", Toast.LENGTH_SHORT).show();
    }
}

DeviceBootReceiver代码：

public class DeviceBootReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
            /* Setting the alarm here */
            Intent alarmIntent = new Intent(context, AlarmReceiver.class);
            PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, alarmIntent, 0);

            AlarmManager manager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
            int interval = 8000;
            manager.setInexactRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), interval, pendingIntent);

            Toast.makeText(context, "Alarm Set", Toast.LENGTH_SHORT).show();
        }
    }
}

如何解决此问题以及何时重启设备启动Service？

Answer 1

在Manifest中添加权限。

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

在Manifest中添加接收者条目。

 <receiver android:enabled="true" android:name=".alarm1.DeviceBootReceiver"
        android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </receiver>

Answer 2

你只需要

申请许可

和

明确启用接收器。

权限包含在清单文件中：

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

然后当用户设置闹钟（例如你的start方法）时，启用启动接收器：

ComponentName receiver = new ComponentName(context, DeviceBootReceiver.class);
getPackageManager().setComponentEnabledSetting(receiver,
    PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
    PackageManager.DONT_KILL_APP);

当用户取消所有警报时，您应该使用类似的代码禁用启动接收器。

如何在Android中重启设备后启动服务

2 个答案: