Android 带有警报管理器和广播接收器的工作室通知未发布通知

Question

我想让我的应用程序定期发送通知（下面的代码设置为 30 秒进行测试，但我会在工作后将其更改为每月一次）。

我正在关注另一个 SO post.

的代码

代码运行没有错误，但没有发送通知。谁能指出我为什么这不起作用的方向。

这是我的 activity 代码（REQUEST_CODE 设置为 0）：

    private void handleNotification() {

        Log.d(TAG, "jjjj3: " + "one" );


        Intent intent = new Intent(HomePage.this, ClassReciever.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(HomePage.this, REQUEST_CODE, intent, 0);
        AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
        alarmManager.setRepeating(alarmManager.RTC_WAKEUP, System.currentTimeMillis(), 30 * 1000, pendingIntent);

        Log.d(TAG, "jjjj4: " + "two" );


    }

这是我的接收器class:

public class ClassReciever extends BroadcastReceiver {

    private static final String TAG = "Receiver";

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

    public void showNotification(Context context) {

        int reqCode = 0;

        Log.d(TAG, "jjjj5: " + "three" );

        Intent intent = new Intent(context, AddBudget.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, reqCode, intent, 0);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
                .setSmallIcon(R.drawable.icon2)
                .setContentTitle("Title")
                .setContentText("Some text");

        builder.setContentIntent(pendingIntent);
        builder.setDefaults(Notification.DEFAULT_SOUND);
        builder.setAutoCancel(true);
        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        assert notificationManager != null;
        notificationManager.notify(reqCode, builder.build());

        Log.d(TAG, "jjjj6: " + "four" );


    }



}

清单：


        <receiver android:name= ".ClassReciever" />

    </application>

Answer 1

你的代码没问题。没有什么问题。但是，如果您想要针对 Android 8.0 及以上 API 26+ 的设备，您必须在发送通知之前创建一个通知渠道

private fun createNotificationChannel() {
    // Create the NotificationChannel, but only on API 26+ because
    // the NotificationChannel class is new and not in the support library
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        val name = getString(R.string.channel_name) // this will be displayed in app settings name it wisely 
        val descriptionText = getString(R.string.channel_description) // this will be displayed in app settings name it wisely
        val importance = NotificationManager.IMPORTANCE_DEFAULT
        val channel = NotificationChannel(CHANNEL_ID, name, importance).apply {
            description = descriptionText
        }
        // Register the channel with the system
        val notificationManager: NotificationManager =
            getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        notificationManager.createNotificationChannel(channel)
    }
}

创建频道后，使用 CHANNEL_ID 发送通知，如下所示：

val builder = NotificationCompat.Builder(this, CHANNEL_ID)
        .setSmallIcon(R.drawable.notification_icon)
        .setContentTitle("My notification")
        .setContentText("Hello World!")
        .setPriority(NotificationCompat.PRIORITY_DEFAULT)
        // Set the intent that will fire when the user taps the notification
        .setContentIntent(pendingIntent)
        .setAutoCancel(true)

有关此代码或 java 代码的更多信息，您可以查看此 Create a Notification

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