Question

下面的代码应该显示抬头通知，但它没有出现。但是，MessageActivity在没有显示通知的情况下启动。该活动应该在点击通知时开始。

API 23（M）中不会发生此问题。它仅发生在API 16（JELLY_BEAN）中。为什么抬头通知出现在Android M中并且没有出现在android JellyBean上？

提前谢谢。

public class RunAlarm extends BroadcastReceiver{

    public static final String ACTION = "br.com.irms.randomalarm.RUN_ALARM_ACTION";
    private static final int ID_NOTIFICATION = 1;

    @Override
    public void onReceive(Context context, Intent intent) {
        String source = intent.getStringExtra("source");

        if(source.equals("scheduled_alarm")) {
            Intent showNotificationIntent = new Intent(context, MessageActivity.class);
            String contentTitle = context.getString(R.string.alarm);
            String contentText = intent.getStringExtra("hour");
            createHeadsUpNotificationWithAction(context, showNotificationIntent, contentTitle, contentText, ID_NOTIFICATION);
        } else if(source.equals("dismiss_alarm")) {
            Toast.makeText(context,"Alarm dismiss",Toast.LENGTH_SHORT).show();
            NotificationManagerCompat nm = NotificationManagerCompat.from(context);
            nm.cancel(ID_NOTIFICATION);
        } else if(source.equals("snooze_alarm")) {
            Toast.makeText(context,"Alarm snooze",Toast.LENGTH_SHORT).show();
            NotificationManagerCompat nm = NotificationManagerCompat.from(context);
            nm.cancel(ID_NOTIFICATION);
        }
    }

    public void createHeadsUpNotificationWithAction((Context context, Intent intent, String contentTitle, String contentText, int id) {
        PendingIntent p = getPendingIntent(context, intent, id);

        NotificationCompat.Builder b = new NotificationCompat.Builder(context);
        b.setDefaults(NotificationCompat.DEFAULT_ALL);
        b.setSmallIcon(R.drawable.ic_alarm_black_24dp);
        b.setContentTitle(contentTitle);
        b.setContentText(contentText);
        b.setContentIntent(p);
        b.setAutoCancel(true);
        b.setPriority(Notification.PRIORITY_MAX);
        b.setFullScreenIntent(p,false);

        try {
            Intent dismissAlarmIntent = new Intent();
            dismissAlarmIntent.setAction(ACTION);
            dismissAlarmIntent.putExtra("source","dismiss_alarm");
            PendingIntent actionDismissAlarmIntent = null;
            actionDismissAlarmIntent = PendingIntent.getBroadcast(
                    context, IdService.getUniqueId(context), dismissAlarmIntent, 0);

            Intent snoozeAlarmIntent = new Intent();
            snoozeAlarmIntent.setAction(ACTION);
            snoozeAlarmIntent.putExtra("source","snooze_alarm");
            PendingIntent actionSnoozeAlarmIntent = null;
            actionSnoozeAlarmIntent = PendingIntent.getBroadcast(
                    context, IdService.getUniqueId(context), snoozeAlarmIntent, 0);

            b.addAction(R.drawable.ic_delete_black_24dp, "Pause", actionDismissAlarmIntent);
            b.addAction(R.drawable.ic_calendar_black_24dp, "Play", actionSnoozeAlarmIntent);
        } catch (IOException e) {
            e.printStackTrace();
        }

        NotificationManagerCompat nm = NotificationManagerCompat.from(context);
        nm.notify(id, b.build());

    }

    private static PendingIntent getPendingIntent(Context context, Intent intent, int id) {
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
        stackBuilder.addParentStack(intent.getComponent());
        stackBuilder.addNextIntent(intent);
        PendingIntent p = stackBuilder.getPendingIntent(id, PendingIntent.FLAG_UPDATE_CURRENT);
        return p;
    }
}

这是我的androidManifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="br.com.irms.layouttab">
    <uses-permission android:name="android.permission.VIBRATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name="br.com.irms.randomalarm.MainActivity"
            android:launchMode="singleTop"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver android:name="br.com.irms.randomalarm.RunAlarm">
            <intent-filter>
                <action android:name="br.com.irms.randomalarm.RUN_ALARM_ACTION" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </receiver>

        <activity
            android:name="br.com.irms.randomalarm.MessageActivity"
            android:label="@string/title_activity_message"
            android:parentActivityName="br.com.irms.randomalarm.MainActivity">
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="br.com.irms.randomalarm.MainActivity" />
        </activity>
    </application>

</manifest>

Answer 1

经过一段时间寻找答案后，我在下面的问题上找到了答案

HeadsUp Notification not displayed on KitKat

简而言之，抬头通知仅在android 5.0中添加。所以，它只是出现在状态栏中，我没有意识到这一点。

Answer 2

您可以像这样管理通知例如： - if（currentapiVersion＆lt; android.os.Build.VERSION_CODES.HONEYCOMB）{

        notification = new Notification(icon, text, time);
        notification.setLatestEventInfo(this, title, text, contentIntent); // This method is removed from the Android 6.0
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        mNM.notify(NOTIFICATION, notification);
    } else {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(
                this);
        notification = builder.setContentIntent(contentIntent)
                .setSmallIcon(icon).setTicker(text).setWhen(time)
                .setAutoCancel(true).setContentTitle(title)
                .setContentText(text).build();

        mNM.notify(NOTIFICATION, notification);
    }

通知不会出现

2 个答案: