从通知栏恢复我的 android 应用程序（应用程序图标仍显示在通知栏中）

Question

我想恢复我的应用程序，就在我离开栏中通知图标的位置。然后我使用了这段代码：

    Intent resultIntent = new Intent(this, MainActivity.class);

    resultIntent.setAction(Intent.ACTION_MAIN);
    resultIntent.addCategory(Intent.CATEGORY_LAUNCHER);
    resultIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    PendingIntent resultPendingIntent = PendingIntent.getActivity( this, 0, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT);

    NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
            .setSmallIcon(R.drawable.ic_speed)
            .setContentTitle(getString(R.string.app_name))
            .setContentText(getString(R.string.txt_welcome))
            .setAutoCancel(true).setDefaults(Notification.DEFAULT_LIGHTS).setWhen(System.currentTimeMillis())
            .setOngoing(true);
    builder.setContentIntent(resultPendingIntent);
    NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    mNotificationManager.notify(0, builder.build());

效果很好，问题是当我按下通知栏中的图标时，它消失了，我需要它留在那儿。

当然，如果我删除这三行：

resultIntent.setAction(Intent.ACTION_MAIN);
resultIntent.addCategory(Intent.CATEGORY_LAUNCHER);
resultIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

在manifest.xml

<activity android:name=".MainActivity"
          android:launchMode="singleInstance"
          android:screenOrientation="portrait"/>

点击后图标不会消失，但我总是重定向到 MainActivity，而不是我离开的地方（当应用程序进入暂停时）。

有什么想法吗？

Answer 1

通知应该持续

mBuilder.setOngoing(true); //this will make ongoing notification

Answer 2

请参考下面的示例，如果它不起作用请告诉我

 private static final int NOTIFICATION_ID = 1;
 private NotificationManager mNotificationManager = null;
 private NotificationCompat.Builder mNotificationBuilder;

 if (mNotificationManager == null) {
            mNotificationManager = (android.app.NotificationManager) getSystemService(NOTIFICATION_SERVICE);
 }
 if (mNotificationBuilder == null) {
            mNotificationBuilder = new NotificationCompat.Builder(getApplicationContext())
                    .setSmallIcon(R.drawable.app_icon_96x96)
                    .setContentText(getContentString(false, 0))
                    .setAutoCancel(false)
                    .setPriority(Notification.PRIORITY_MAX)
                    .setOngoing(true)
                    .setCategory(NOTIFICATION_SERVICE);
 }

Answer 3

尝试设置：

setAutoCancel(false)

参考：https://developer.android.com/reference/android/app/Notification.Builder.html#setAutoCancel(boolean)

希望对您有所帮助！

编辑：

根据讨论，需要在清单中设置：

android:launchMode="singleTop"

这将为 "onNewIntent" 函数提供新的意图，如果您的 activity 已经运行。

，该函数可用于执行进一步的操作

Answer 4

试试这个代码..！

void notifyme(String string){

String ns = Context.NOTIFICATION_SERVICE;
NotificationManager mNotificationManager = (NotificationManager)
                                            getSystemService(ns);

int icon = R.drawable.notification_icon;        // icon from resources
CharSequence tickerText = string + " Program Running...";     // ticker-text
long when = System.currentTimeMillis();         // notification time
Context context = getApplicationContext();      // application Context
CharSequence contentTitle = *********;  // expanded message title
CharSequence contentText = string + " Program Running...";//expanded msg text

Intent notificationIntent = new Intent(this, Main.class);
PendingIntent contentIntent = PendingIntent.getActivity(
                                            this, 0, notificationIntent, 0);

// the next two lines initialize the Notification, using the configurations
// above
Notification notification = new Notification(icon, tickerText, when);
notification.setLatestEventInfo(context, contentTitle, contentText,
                                                            contentIntent);
final int HELLO_ID = 1;
mNotificationManager.notify(HELLO_ID, notification);
}

添加后

final Intent notificationIntent = new Intent(context, YourActivity.class);
notificationIntent.setAction(Intent.ACTION_MAIN);
notificationIntent.addCategory(Intent.CATEGORY_LAUNCHER);
notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

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