开始第二个活动，但不能回到第一个活动

Question

假设我完全了解我的应用程序。（不再有活动堆栈）

然而，当点击时，通知到达，用户将导航到第二个活动

问题是如何使第二个活动返回到第一个活动（lancher），然后退出

而不是直接退出，如果按下后退按钮（因为它没有任何堆栈）！？

导航到第二幕的通知

 NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.ic_stat_social_person)
                        .setContentTitle("AIR° TRACKING MODE!")
                        .setStyle(new NotificationCompat.BigTextStyle()
                                .bigText(msg))
                        .setContentText(msg)
                        .setLights(Color.BLUE, 500, 500)
                        .setDefaults(Notification.DEFAULT_ALL)
                        .setOngoing(true);
        PendingIntent contentIntent = PendingIntent.getActivity(
                this,
                0,
                new Intent(this, Activity_Second.class).addFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT),
                PendingIntent.FLAG_UPDATE_CURRENT);
        mBuilder.setContentIntent(contentIntent);
        mNotificationManager.notify(GM.NOTIFICATION_TRACKING_MODE, mBuilder.build());
    }

Answer 1

TaskStackBuilder是最好的选择，我认为是的…

    TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
    // Adds the back stack for the Intent (but not the Intent itself)
    stackBuilder.addParentStack(Activity_One.class);
    stackBuilder.addNextIntent(resultIntent);

并且在清单中：

为API工作<16

 <activity android:name=".Activity_Second">
    <meta-data
        android:name="android.support.PARENT_ACTIVITY"
        android:value=".Activity_One" />
    </activity>

API>16

 <activity android:name=".Activity_Second"
        android:parentActivityName=".Activity_One" />

对不起。使用TaskStackBuilder时，请记住编辑PendingIntent，如下所示：

     PendingIntent contentIntent =
        stackBuilder.getPendingIntent(
            0,
            PendingIntent.FLAG_UPDATE_CURRENT
        );

Answer 2

试试这个。。

您可以在onBackPressed() Override方法中将其从Activity_Second.class添加到Activity_First.class

@Override
public void onBackPressed() {
    Intent ide = new Intent(this, Activity_First.class);
    ide.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    startActivity(ide);
    finish();
}

Answer 3

使用TaskStackBuilder：

阅读本文档。

Answer 4

TaskStackBuilder最适合复杂活动易于管理。。。如果你知道怎么做！

从通知中导航代码&添加适当的后堆栈

    NotificationCompat.Builder mBuilder =
            new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.ic_stat_social_person)
                    .setContentTitle("AIR° TRACKING MODE!")
                    .setStyle(new NotificationCompat.BigTextStyle()
                            .bigText(msg))
                    .setContentText(msg)
                    .setLights(Color.BLUE, 500, 500)
                    .setDefaults(Notification.DEFAULT_ALL)
                    .setOngoing(true);
    PendingIntent contentIntent = TaskStackBuilder.create(this)
            //addParentStack is destination class not its parent class
            //it will refer parent class from what you define in XML
            .addParentStack(Activity_TrackingMode.class)
            //and provide intent for destination class
            .addNextIntent(new Intent(this, Activity_TrackingMode.class))
            .getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
    mBuilder.setContentIntent(contentIntent);
    mNotificationManager.notify(GM.NOTIFICATION_TRACKING_MODE, mBuilder.build());

AndroidManifest中的XML示例

    <activity android:name=".Activity_TrackingMode"
              android:label="@string/app_name"
              android:screenOrientation="portrait"
              android:parentActivityName=".Activity_Screen1">
        <!-- Parent activity meta-data to support 4.0 and lower -->
        <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".Activity_Screen1" />
        <intent-filter>
            <category android:name="android.intent.category.DEFAULT"/>
        </intent-filter>
    </activity>

PS>import android.support.v4.app.TaskStackBuilder;//支持低于16 的API

Answer 5

Hariharan的答案是正确的，除了flag。请使用以下代码：

@Override
public void onBackPressed() {
    Intent ide = new Intent(this, Activity_First.class);
    ide.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
    startActivity(ide);
    finish();
}