每 5 分钟通知一次

Question

我想在使用以下

代码每 5 分钟向用户发出通知。它第一次向我显示通知，但下次不会给我。

public void startAlarm() {
    AlarmManager alarmManager = (AlarmManager) this.getSystemService(this.ALARM_SERVICE);
    long whenFirst = System.currentTimeMillis();         // notification time
    Intent intent = new Intent(this, NotifyUser.class);
    PendingIntent pendingIntent = PendingIntent.getService(this, 0, intent, 0);
    alarmManager.setRepeating(AlarmManager.RTC, whenFirst, 60*5000, pendingIntent);            
}
public class NotifyUser extends Service {   
    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }
    @Override
    public void onCreate() {
        super.onCreate();
        loadNotification(); 
    }
    private void loadNotification() {
        NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notify = new Notification(R.drawable.ic_launcher/*android.R.drawable.stat_notify_more*/, "Hanumanji waiting for you", System.currentTimeMillis());
        Context context = NotifyUser.this;
        CharSequence title = "Hanumanji is waiting for you";
        CharSequence details = "Do Hanuman Chalisa Parayan with ShlokApp.";
        Intent intent = new Intent(context, NotifyUser.class);
        PendingIntent pending = PendingIntent.getActivity(context, 0, intent, 0);
        notify.setLatestEventInfo(context, title, details, pending);
        notify.sound = Uri.parse("android.resource://pro.shlokapp.hanumanchalisa/"+ R.raw.game_sound_pause);
        nm.notify(0, notify);
    }
    public int onStartCommand(Intent intent, int flags, int startId) {
        return 1;
    }
    public void onStart(Intent intent, int startId) {
        // TO DO
    }
    public IBinder onUnBind(Intent arg0) {
        // TO DO Auto-generated method
        return null;
    }
    public void onStop() {}
    public void onPause() {}
    @Override
    public void onDestroy() {}
    @Override
    public void onLowMemory() {}
}

Answer 1

它第一次向我显示通知，但下次不会给我。 ：原因是您使用nm.notify(0, notify);不要使用 0，因为它将显示最新通知。

下面的代码就像一个魅力：

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    MyTimerTask myTask = new MyTimerTask();
    Timer myTimer = new Timer();
    myTimer.schedule(myTask, 5000, 1500);
}
class MyTimerTask extends TimerTask {
    public void run() {
        generateNotification(getApplicationContext(), "Hello");
    }
}
private void generateNotification(Context context, String message) {
    int icon = R.drawable.ic_launcher;
    long when = System.currentTimeMillis();
    String appname = context.getResources().getString(R.string.app_name);
    NotificationManager notificationManager = (NotificationManager) context
            .getSystemService(Context.NOTIFICATION_SERVICE);
    int currentapiVersion = android.os.Build.VERSION.SDK_INT;
    Notification notification;
    PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
            new Intent(context, MainActivity.class), 0);
    // To support 2.3 os, we use "Notification" class and 3.0+ os will use
    // "NotificationCompat.Builder" class.
    if (currentapiVersion < android.os.Build.VERSION_CODES.HONEYCOMB) {
        notification = new Notification(icon, message, 0);
        notification.setLatestEventInfo(context, appname, message,
                contentIntent);
        notification.flags = Notification.FLAG_AUTO_CANCEL;
        notificationManager.notify((int) when, notification);
    } else {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(
                context);
        notification = builder.setContentIntent(contentIntent)
                .setSmallIcon(icon).setTicker(appname).setWhen(0)
                .setAutoCancel(true).setContentTitle(appname)
                .setContentText(message).build();
        notificationManager.notify((int) when, notification);
    }
}

}

使用计时器类。 根据需要更改计时器间隔。希望这有帮助。

Answer 2

在这篇文章中，如何确切地使用Notification.Builder有一个例子。我用它来在我的应用程序中发出通知。它还使用支持库中的通知生成器。

我认为在上面的代码中，您只是在更新已经存在的通知。尝试通过显示一个数字来检查它，该数字在每次设置/更新新通知时都会增加 1。

希望这会对您有所帮助=(。

Answer 3

MainActivity.java//它包含在文本视图 tvTime

    public class MainActivity extends Activity {
    private SampleAlarmReceiver alarm;
    private ListView listView;
    private ArrayList<String> times;
    private ArrayAdapter mAdapter;
    private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            displayTime();
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.listView);
        alarm = new SampleAlarmReceiver();
        alarm.setAlarm(this);
        times = new ArrayList<>();
        Calendar c = Calendar.getInstance();
        String time = c.get(Calendar.HOUR) + ":" + c.get(Calendar.MINUTE) + ":" + c.get(Calendar.SECOND);
        times.add(time);
        mAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, times);
        listView.setAdapter(mAdapter);
    }
    @Override
    protected void onResume() {
        super.onResume();
        LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver,
                new IntentFilter("display_time"));
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            // When the user clicks START ALARM, set the alarm.
            case R.id.start_action:
                alarm.setAlarm(this);
                return true;
            // When the user clicks CANCEL ALARM, cancel the alarm. 
            case R.id.cancel_action:
                alarm.cancelAlarm(this);
                return true;
        }
        return false;
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
    }
    @SuppressLint("SetTextI18n")
    public void displayTime() {
        Calendar c = Calendar.getInstance();
        String time = c.get(Calendar.HOUR) + ":" + c.get(Calendar.MINUTE) + ":" + c.get(Calendar.SECOND);
        times.add(time);
        mAdapter.notifyDataSetChanged();
    }
}

样本报警接收器.java

public class SampleAlarmReceiver extends WakefulBroadcastReceiver {
    // The app's AlarmManager, which provides access to the system alarm services.
    private AlarmManager alarmMgr;
    // The pending intent that is triggered when the alarm fires.
    private PendingIntent alarmIntent;
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent intent1 = new Intent("display_time");
        // You can also include some extra data.
        LocalBroadcastManager.getInstance(context).sendBroadcast(intent1);
    }
    // BEGIN_INCLUDE(set_alarm)
    /**
     * Sets a repeating alarm that runs once a day at approximately 8:30 a.m. When the
     * alarm fires, the app broadcasts an Intent to this WakefulBroadcastReceiver.
     *
     * @param context given context
     */
    public void setAlarm(Context context) {
        alarmMgr = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(context, SampleAlarmReceiver.class);
        alarmIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
        alarmMgr.setInexactRepeating(AlarmManager.RTC_WAKEUP,
                5 * 60 * 1000,  // After five minute
                5 * 60 * 1000,  // Every five minute
                alarmIntent);
        // Enable {@code SampleBootReceiver} to automatically restart the alarm when the
        // device is rebooted.
        ComponentName receiver = new ComponentName(context, SampleBootReceiver.class);
        PackageManager pm = context.getPackageManager();
        pm.setComponentEnabledSetting(receiver,
                PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
                PackageManager.DONT_KILL_APP);
    }
    /**
     * Cancels the alarm.
     *
     * @param context given context
     */
    public void cancelAlarm(Context context) {
        // If the alarm has been set, cancel it.
        if (alarmMgr != null) {
            alarmMgr.cancel(alarmIntent);
        }
        // Disable {@code SampleBootReceiver} so that it doesn't automatically restart the 
        // alarm when the device is rebooted.
        ComponentName receiver = new ComponentName(context, SampleBootReceiver.class);
        PackageManager pm = context.getPackageManager();
        pm.setComponentEnabledSetting(receiver,
                PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
                PackageManager.DONT_KILL_APP);
    }
}

SampleBootReceiver.java

public class SampleBootReceiver extends BroadcastReceiver {
    SampleAlarmReceiver alarm;
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED"))
        {
            alarm  = new SampleAlarmReceiver();
            alarm.setAlarm(context);
        }
    }
}

main.xml//这是 MainActivity 中使用的菜单

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/start_action"
        android:title="Start Alarm"
        app:showAsAction="ifRoom|withText" />
    <item
        android:id="@+id/cancel_action"
        android:title="Stop Alarm"
        app:showAsAction="ifRoom|withText" />
</menu>

清单.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.alarmmanager">
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".SampleAlarmReceiver" />
        <receiver
            android:name=".SampleBootReceiver"
            android:enabled="false">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>
    </application>
</manifest>