android 如何在点击通知时打开最后 activity

Question

我已经观察到几个类似的问题，但它们无法帮助我。当用户点击通知时，我需要显示 last activity 。这是我的代码：

NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(YourService.this)
        .setContentTitle(getResources().getText(R.string.app_name))
        .setContentText(getServiceStateDescription(YourService.this))
        .setSmallIcon(iconId)
        .setWhen(System.currentTimeMillis());

Intent nIntent = getPreviousIntent();
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
// Adds the back stack
stackBuilder.addParentStack(MainActivity_.class);
stackBuilder.addNextIntent(nIntent);
PendingIntent pendingIntent =
        stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
notificationBuilder.setContentIntent(pendingIntent);

startForeground(ContextConstants.LAUNCHER_SERVICE_NOTE_ID, notificationBuilder.build());


private Intent getPreviousIntent() {
Intent newIntent = null;
final ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
    final List<ActivityManager.AppTask> recentTaskInfos = activityManager.getAppTasks();
    if (!recentTaskInfos.isEmpty()) {
        for (ActivityManager.AppTask appTaskTaskInfo: recentTaskInfos) {
            if (appTaskTaskInfo.getTaskInfo().baseIntent.getComponent().getPackageName().equals(ContextConstants.PACKAGE_NAME)) {
                newIntent = appTaskTaskInfo.getTaskInfo().baseIntent;
                newIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            }
        }
    }
} else {
    final List<ActivityManager.RecentTaskInfo> recentTaskInfos = activityManager.getRecentTasks(1024, 0);
    if (!recentTaskInfos.isEmpty()) {
        for (ActivityManager.RecentTaskInfo recentTaskInfo: recentTaskInfos) {
            if (recentTaskInfo.baseIntent.getComponent().getPackageName().equals(ContextConstants.PACKAGE_NAME)) {
                newIntent = recentTaskInfo.baseIntent;
                newIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            }
        }
    }
}
if (newIntent == null) newIntent = new Intent();
return newIntent;

}

第二点是，如果我使用已弃用的方法来构建通知，显示最后一个 activity 效果很好，因为我想要这里是代码：

Notification note = new Notification(iconId,
            getResources().getText(R.string.serviceStarted),
            System.currentTimeMillis());
    note.flags |= Notification.FLAG_ONGOING_EVENT;
    note.flags |= Notification.FLAG_NO_CLEAR;

    Intent nIntent = new Intent();
    nIntent = getPreviousIntent(nIntent);
    PendingIntent pi = PendingIntent.getActivity(this, 0, nIntent, 0);
    note.setLatestEventInfo(this,
            getResources().getText(R.string.app_name), getServiceStateDescription(YourService.this), pi);

    startForeground(ContextConstants.LAUNCHER_SERVICE_NOTE_ID, note);

But i don't want use deprecated metods anymore, that's why i'm here explaining. Thanks in advance!

我也看过 this 文档。

这是我的清单：

<?xml version="1.0" encoding="utf-8"?>

<permission android:name="com.my.package.permission.C2D_MESSAGE" android:protectionLevel="signature" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.VIBRATE"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.READ_CONTACTS"/>
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="com.my.package.permission.C2D_MESSAGE" />
<uses-permission android:name="android.permission.GET_TASKS"/>

<application
    android:name=".MyApplication"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/Theme.AppCompat.Light">
    <activity android:name=".activity.StartingActivity_"  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=".activity.MainActivity_"
        android:configChanges="orientation|screenSize">
    </activity>
    <activity
        android:name=".activity.ComposeEmailActivity_"
        android:configChanges="orientation|screenSize"
        android:parentActivityName=".activity.MainActivity_">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".activity.MainActivity_" />
    </activity>
    <activity
        android:name=".activity.EditAccountActivity_"
        android:configChanges="orientation|screenSize"
        android:parentActivityName=".activity.MainActivity_">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".activity.MainActivity_" />
    </activity>               

    <!--android:process=":remote" is for working in background-->
    <service android:enabled="true" android:name=".service.YourService"/>       

</application>

Answer 1

您的问题不在于您用来构建 Notification 的方法。您的问题是您对 TaskStackBuilder 的使用。使用这个 class 在幕后执行了很多隐藏的魔法，并且它对您希望应用程序的行为方式做出了很多假设。不幸的是，这些假设大多是错误的:-(

如果您只是想将您的应用程序以它进入后台时所处的任何状态带到前台，您不想使用 TaskStakBuilder 并且您也不必使用所有那些讨厌的 ActivityManager 方法。只需这样做：

NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(YourService.this)
    .setContentTitle(getResources().getText(R.string.app_name))
    .setContentText(getServiceStateDescription(YourService.this))
    .setSmallIcon(iconId)
    .setWhen(System.currentTimeMillis());

Intent nIntent = getPackageManager().
        getLaunchIntentForPackage(ContextConstants.PACKAGE_NAME);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, nIntent,
    PendingIntent.FLAG_UPDATE_CURRENT);
notificationBuilder.setContentIntent(pendingIntent);

startForeground(ContextConstants.LAUNCHER_SERVICE_NOTE_ID,
    notificationBuilder.build());

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