編寫:fastcome1985 - 原文:http://developer.android.com/training/notify-user/navigation.html
部分設計一個notification的目的是為了保持用戶的導航體驗。為了詳細討論這個課題,請看 Notifications API引導,分為下列兩種主要情況:
* 常規的activity
你啟動的是你application工作流中的一部分[Activity](developer.android.com/reference/android/app/Activity.html)。
* 特定的activity
用戶只能從notification中啟動,才能看到這個[Activity](http://developer.android.com/intl/zh-cn/reference/android/app/Activity.html),在某種意義上,這個[Activity](http://developer.android.com/intl/zh-cn/reference/android/app/Activity.html)是notification的擴展,額外展示了一些notification本身難以展示的信息。
設置一個直接啟動的入口Activity的PendingIntent,遵循以下步驟:
1 在manifest中定義你application的Activity層次,最終的manifest文件應該像這個:
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".ResultActivity"
android:parentActivityName=".MainActivity">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".MainActivity"/>
</activity>
2 在基於啟動Activity的Intent中創建一個返回棧,比如:
int id = 1;
...
Intent resultIntent = new Intent(this, ResultActivity.class);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
// Adds the back stack
stackBuilder.addParentStack(ResultActivity.class);
// Adds the Intent to the top of the stack
stackBuilder.addNextIntent(resultIntent);
// Gets a PendingIntent containing the entire back stack
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
...
NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
builder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(id, builder.build());
一個特定的Activity不需要一個返回棧,所以你不需要在manifest中定義Activity的層次,以及你不需要調用 addParentStack()方法去構建一個返回棧。作為代替,你需要用manifest設置Activity任務選項,以及調用 getActivity()創建PendingIntent
manifest中,在Activity的
建立以及發佈notification: a.創建一個啟動Activity的Intent. b.通過調用setFlags()方法並設置標識FLAG_ACTIVITY_NEW_TASK 與 FLAG_ACTIVITY_CLEAR_TASK,來設置Activity在一個新的,空的任務中啟動。 c.在Intent中設置其他你需要的選項。 d.通過調用 getActivity()方法從Intent中創建一個 PendingIntent,你可以把這個PendingIntent 當做 setContentIntent()的參數來使用。 下面的代碼片段演示了這個過程:
// Instantiate a Builder object.
NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
// Creates an Intent for the Activity
Intent notifyIntent =
new Intent(new ComponentName(this, ResultActivity.class));
// Sets the Activity to start in a new, empty task
notifyIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
Intent.FLAG_ACTIVITY_CLEAR_TASK);
// Creates the PendingIntent
PendingIntent notifyIntent =
PendingIntent.getActivity(
this,
0,
notifyIntent,
PendingIntent.FLAG_UPDATE_CURRENT
);
// Puts the PendingIntent into the notification builder
builder.setContentIntent(notifyIntent);
// Notifications are issued by sending them to the
// NotificationManager system service.
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// Builds an anonymous Notification object from the builder, and
// passes it to the NotificationManager
mNotificationManager.notify(id, builder.build());