Question

这是我第一次尝试制作一个在启动时启动并在后台运行的应用程序，并且我发现所有可能的方法都有点令人困惑。我需要应用程序每隔半小时快速检查几件事情，并在两者之间睡觉，所以我决定使用AlarmManager和setRepeating。

在此测试中，我已将其设置为启动接收器设置警报，该警报应每60秒运行一次服务（实际应用程序在运行此服务之间将超过30分钟）。该服务会触发通知，但是当我重新启动手机时，通知只会显示一次。我清除了它，再也没有看到它。

我将在下面发布相关代码。谁能告诉我哪里出错？谢谢！

AlarmStarter.java

 public class AlarmStarter extends BroadcastReceiver {

    private static final int PERIOD = 60000;

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

        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
            scheduleAlarms(context);
        }
    }

    static void scheduleAlarms(Context ctxt) {

        AlarmManager mgr = (AlarmManager) ctxt.getSystemService(Context.ALARM_SERVICE);

        Intent i = new Intent(ctxt, BackService.class);

        PendingIntent pi = PendingIntent.getService(ctxt, 0, i, 0);

        mgr.setRepeating(AlarmManager.ELAPSED_REALTIME,

        SystemClock.elapsedRealtime() + PERIOD, PERIOD, pi);
    }

BackService.java

public class BackService extends Service {

    public BackService() {

        //showNotification("ticker test", "title test", "content test", "http://google.com");
        Log.d("CF", "Starting BackService");
        showNotification("ticker test", "title test", "content test", "http://google.com");
    }

    @Override
    public IBinder onBind(Intent intent) {

        // TODO: Return the communication channel to the service.

        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override

    public void onCreate() {
        // Code to execute when the service is first created
    }

    public void showNotification(String ticker, String title, String content, String url) {
        Intent notificationIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));

        PendingIntent pi = PendingIntent.getActivity(this, 0, notificationIntent, 0);

        Notification notification = new NotificationCompat.Builder(this).setTicker(ticker)

            .setSmallIcon(android.R.drawable.ic_menu_report_image)
            .setContentTitle(title)
            .setContentText(content)
            .setContentIntent(pi)
            .setAutoCancel(true)
            .build();

        NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

        notificationManager.notify(0, notification);
    }
}

的AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.testapp.test" >
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <application

    android:allowBackup="true"

    android:icon="@mipmap/ic_launcher"

    android:label="@string/app_name"

    android:theme="@style/AppTheme" >
        <receiver

    android:name=".AlarmStarter"

    android:enabled="true" >
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>
        <activity

    android:name=".MainActivity"

    android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service

    android:name=".BackService"

    android:enabled="true"

    android:exported="true" ></service>
    </application>
</manifest>

Answer 1

我遇到的问题是我试图通过警报触发的BackService类是从Service类扩展的。它应该从BroadcastReceiver类扩展，因为只有BroadcastReceivers可以由外部发送的警报触发。

AlarmManager，setRepeat但仅显示一次

1 个答案: