java - 单击通知启动 Activity 时控制后退堆栈

Question

用户在应用处于后台时点击通知，应用打开并跳转到 PickUpActivity

NotificationManager mNotifyMgr = (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
int notificationId = (int) System.currentTimeMillis();
Intent picukUpIntent = new Intent(context, PickUpActivity.class);
picukUpIntent.putExtra(MainScreenActivity.ORDER_ID, orderId);
picukUpIntent.putExtra(NOTI_TYPE, 3);
pendingIntent = PendingIntent.getActivity(
                   context,
                   notificationId,
                   picukUpIntent,
                   PendingIntent.FLAG_ONE_SHOT
                );

NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
                    .setSmallIcon(R.drawable.ic_mini_logo)
                    .setContentTitle("Title")
                    .setContentText(message)
                    .setVisibility(Notification.VISIBILITY_PUBLIC)
  .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
                    .setAutoCancel(true);
builder.setContentIntent(pendingIntent);
mNotifyMgr.notify(notificationId, builder.build());

当用户在应用程序处于后台时单击通知时，它会按照我的预期跳转到 PickUpActivity。问题是，当用户单击向上或后退按钮时，它会退出应用程序。我希望当用户单击后退或向上按钮时它跳转到 MainScreenActivity。当用户在应用程序位于前台时单击通知时，效果很好。所以我不想覆盖 PickUpActivity 中的后退和向上按钮行为。有没有办法将 PickUpActivity 的父级设置为 MainScreenActivity我确实在 list 中设置了父项，但它不起作用

<activity
    android:name=".screen.rating.PickUpActivity"
    android:parentActivityName=".screen.main.MainScreenActivity"
    android:screenOrientation="portrait">
    <meta-data
        android:name="android.support.PARENT_ACTIVITY"
        android:value=".screen.main.MainScreenActivity" />
</activity>

Answer 1

您需要在应用程序处于后台或前台时识别您的应用程序状态，因此使用以下方法您可以识别您的应用程序状态。

public static boolean isAppIsInBackground(Context context) {
        boolean isInBackground = true;
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT_WATCH) {
            List<ActivityManager.RunningAppProcessInfo> runningProcesses = am.getRunningAppProcesses();
            for (ActivityManager.RunningAppProcessInfo processInfo : runningProcesses) {
                if (processInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
                    for (String activeProcess : processInfo.pkgList) {
                        if (activeProcess.equals(context.getPackageName())) {
                            isInBackground = false;
                        }
                    }
                }
            }
        } else {
            List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);
            ComponentName componentInfo = taskInfo.get(0).topActivity;
            if (componentInfo.getPackageName().equals(context.getPackageName())) {
                isInBackground = false;
            }
        }
        return isInBackground;
    }

然后简单地将下面一行代码添加到您的后按事件中

 @Override
    public void onBackPressed() {
        super.onBackPressed();
        if(NotificationUtils.isAppIsInBackground(context)){
            //open your main screen activity MainScreenActivity.class
        }else{
            // what you want
        }
    }