Android 在与PendingEvent相同的活动中选择通知，但查看页面不同

场景： 我的应用程序有一个活动，其中包含一个ViewPager，显示两个片段（称为a页和B页）

问题： 当后台事件触发页面a的通知，且用户在页面B上时，选择通知不起任何作用；i、 e.没有对onCreate（）、onResume（）、onNewIntent（）、onResumeFragments（）或onStart（）的回调，用户停留在页面B上

问题：

// Create a notification
    final Context ctx = this;
    Intent notificationIntent = new Intent(ctx, ActivityMain.class);
    notificationIntent.putExtra(INTENT_EXTRA_NOTIFICATION, true);

    NotificationManager notificationManager = (NotificationManager) ctx.getSystemService(Context.NOTIFICATION_SERVICE);
    Resources res = ctx.getResources();

    PendingIntent pendingIntent = PendingIntent.getActivity(ctx, REQUESTCODE_ACTIVITYMAIN_LISTFRAGMENT, notificationIntent, PendingIntent.FLAG_CANCEL_CURRENT);

    Notification.Builder builder = new Notification.Builder(ctx);
    builder.setContentIntent(pendingIntent)
                .setSmallIcon(R.drawable.ic_launcher)//required
                .setLargeIcon(BitmapFactory.decodeResource(res, R.drawable.ic_launcher))
                .setContentTitle(res.getString(R.string.notification_title))//required
                .setContentText(data.description)//required
                .setTicker(res.getString(R.string.notification_title))
                .setWhen(System.currentTimeMillis())
                .setDefaults(Notification.DEFAULT_SOUND | Notification.DEFAULT_LIGHTS)
                .setAutoCancel(true);

    Notification notification = builder.build();

    notificationManager.notify(mNotificationID, notification);

• 当用户使用ViewPager时，如何使ViewPager显示页面 是否已选择通知并在B页

或

• 是否可以在活动中检测用户何时 是否选择了指向同一活动的通知

通知代码：

// Create a notification
    final Context ctx = this;
    Intent notificationIntent = new Intent(ctx, ActivityMain.class);
    notificationIntent.putExtra(INTENT_EXTRA_NOTIFICATION, true);

    NotificationManager notificationManager = (NotificationManager) ctx.getSystemService(Context.NOTIFICATION_SERVICE);
    Resources res = ctx.getResources();

    PendingIntent pendingIntent = PendingIntent.getActivity(ctx, REQUESTCODE_ACTIVITYMAIN_LISTFRAGMENT, notificationIntent, PendingIntent.FLAG_CANCEL_CURRENT);

    Notification.Builder builder = new Notification.Builder(ctx);
    builder.setContentIntent(pendingIntent)
                .setSmallIcon(R.drawable.ic_launcher)//required
                .setLargeIcon(BitmapFactory.decodeResource(res, R.drawable.ic_launcher))
                .setContentTitle(res.getString(R.string.notification_title))//required
                .setContentText(data.description)//required
                .setTicker(res.getString(R.string.notification_title))
                .setWhen(System.currentTimeMillis())
                .setDefaults(Notification.DEFAULT_SOUND | Notification.DEFAULT_LIGHTS)
                .setAutoCancel(true);

    Notification notification = builder.build();

    notificationManager.notify(mNotificationID, notification);

---

可能有一个标志/配置可以添加到通知意图中，以强制活动识别所选的通知？

这需要一些努力，但以下是为已在前台运行的活动选择通知时切换ViewPager选项卡的解决方案：

1）使用标志

flag\u ACTIVITY\u NEW\u TASK

创建通知，并额外显示通知启动了此活动

// Create a notification
final Context ctx = this;
Intent notificationIntent = new Intent(ctx, ActivityMain.class);
notificationIntent.putExtra(INTENT_EXTRA_NOTIFICATION, true);
notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//see rest of code in my question to create the notification

<activity
    android:name="com.cool.app.ActivityMain"
    android:label="@string/app_name"
    android:launchMode="singleTop" >
</activity>

2）使用活动的

singleTop

更新清单

// Create a notification
final Context ctx = this;
Intent notificationIntent = new Intent(ctx, ActivityMain.class);
notificationIntent.putExtra(INTENT_EXTRA_NOTIFICATION, true);
notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//see rest of code in my question to create the notification

<activity
    android:name="com.cool.app.ActivityMain"
    android:label="@string/app_name"
    android:launchMode="singleTop" >
</activity>

4）在

ActivityMain

（或任何您的活动）中覆盖onResume（），并包含切换选项卡的逻辑

@Override
protected void onResume()
{
    super.onResume();

    // Test if a Notification caused this activity to launch - if so then select the first tab
    // NOTE: we get here from a notification by using Intent.FLAG_ACTIVITY_NEW_TASK
    Bundle extras = getIntent().getExtras();
    if (extras != null)
    {
        final boolean bIsLaunchedFromNotification = extras.getBoolean(INTENT_EXTRA_NOTIFICATION);
        if (bIsLaunchedFromNotification)
        {
            final ActionBar actionBar = getActionBar();
            actionBar.setSelectedNavigationItem(0);
        }
    }
}

5）对于良好形式-在ActivityMain（或应用程序）中，定义常数以传递额外值

final public static String INTENT_EXTRA_NOTIFICATION = "fromNotification";