Android 应用程序在通知点击时启动缓慢答案

【问题标题】：Android app launches slow on notification tapAndroid 应用程序在通知点击时启动缓慢
【发布时间】：2018-12-20 12:11:04
【问题描述】：

我正在使用 FCM 向我的应用发送推送通知；用户点击通知时的预期行为是正常启动应用程序，例如点击启动器应用程序图标。

目前，当用户点击通知时，会在应用打开前等待超过 30 秒。通知消失了，但应用程序没有打开......甚至没有白屏，什么都没有。

当onMessageReceived被触发时，displayNotification方法被调用。

private void displayNotification(String title, String body) {

    createNotificationChannel();
    PendingIntent contentIntent = generateNotificationContentIntent();

    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, CONTENTS_CHANNEL_ID)
            .setSmallIcon(R.drawable.logo_no_bg_white)
            .setContentTitle(title)
            .setContentText(body)
            .setContentIntent(contentIntent)
            .setAutoCancel(true);

    NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
    notificationManager.notify(new Random().nextInt(), notificationBuilder.build());
}

private PendingIntent generateNotificationContentIntent(){
    Intent intent = new Intent(this, MainActivity.class);
    TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
    stackBuilder.addNextIntentWithParentStack(intent);
    return stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
}

private void createNotificationChannel() {

    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O){
        return;
    }

    NotificationChannel notificationChannel = new NotificationChannel(CONTENTS_CHANNEL_ID, CONTENTS_CHANNEL_ID, NotificationManager.IMPORTANCE_DEFAULT);
    notificationChannel.setDescription(CONTENTS_CHANNEL_ID);

    NotificationManager notificationManager = getSystemService(NotificationManager.class);
    notificationManager.createNotificationChannel(notificationChannel);

}

我的 onCreate MainActivity 方法只是检查用户是否已登录，如果是，则启动 HomeActivity：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    PACKAGE_NAME = getApplicationContext().getPackageName();

    //Read shared preferences.
    sharedPref = getSharedPreferences(PACKAGE_NAME, Context.MODE_PRIVATE);

    if(sharedPref.contains("token") || sharedPref.getBoolean("isGuest", false)){
        //Redirect to home
        Intent homeIntent = new Intent(getApplicationContext(), HomeActivity.class );
        homeIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
        startActivity(homeIntent);
        finish();
    }

    loadTowns(this);

}

我做错了什么？

更新：清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="my.awesome.package">

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />

<application
    android:allowBackup="false"
    android:icon="@mipmap/icon"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/icon"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    tools:ignore="GoogleAppIndexingWarning">
    <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="${applicationId}.com.vansuita.pickimage.provider"
        android:exported="false"
        android:grantUriPermissions="true"
        tools:replace="android:authorities">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/picker_provider_paths" />
    </provider>

    <meta-data
        android:name="com.google.firebase.messaging.default_notification_icon"
        android:resource="@drawable/logo_no_bg_white" />
    <meta-data
        android:name="com.google.firebase.messaging.default_notification_color"
        android:resource="@android:color/holo_orange_dark" />

    <activity
        android:name=".MainActivity"
        android:screenOrientation="portrait"
        android:theme="@style/NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".LoginActivity"
        android:screenOrientation="portrait"
        android:theme="@style/NoActionBar" />
    <activity
        android:name=".HomeActivity"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme" />
    <activity
        android:name=".ChannelProfileActivity"
        android:label="@string/channel"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme" />
    <activity
        android:name=".TownProfileActivity"
        android:label="@string/town"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme" />
    <activity
        android:name=".ContentActivity"
        android:label="@string/content"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".HomeActivity" />
    </activity>
    <activity
        android:name=".ContentsListActivity"
        android:label="@string/contents"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".HomeActivity" />
    </activity>
    <activity
        android:name=".QuestionResultsActivity"
        android:label="@string/question"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".HomeActivity" />
    </activity>
    <activity
        android:name=".ForgetPasswordActivity"
        android:label="@string/DidYouForgetPassword"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme" />
    <activity
        android:name=".ValidationProcesActivity"
        android:label="@string/verify_user"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".HomeActivity" />
    </activity>
    <activity
        android:name=".QuestionVoteActivity"
        android:label="@string/question"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".HomeActivity" />
    </activity>
    <activity
        android:name=".NewUserActivity"
        android:label="@string/new_user"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme" />
    <activity
        android:name=".NewUserSuccessActivity"
        android:label="@string/new_user"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme" />

    <service android:name=".firebase.MyFirebaseMessagingService">
        <intent-filter>
            <action android:name="com.google.firebase.MESSAGING_EVENT" />
        </intent-filter>
    </service>
    <service android:name=".firebase.MyFirebaseInstanceIdService">
        <intent-filter>
            <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
        </intent-filter>
    </service>

    <activity
        android:name=".NotificationsActivity"
        android:label="@string/notifications"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme" />
    <activity
        android:name=".ViewNotificationActivity"
        android:label="@string/notifications"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme" />
    <activity
        android:name=".NewFriendshipRequestActivity"
        android:label="@string/notifications"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme" />

    <activity
        android:name=".TypeUserSelectionActivity"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme" />
    <activity
        android:name=".SelectTownActivity"
        android:screenOrientation="portrait"
        android:theme="@style/WhiteActionBarTheme" />
</application>

【问题讨论】：

你能显示清单文件吗？
当然@Nakul，我发布了，谢谢:)
loadTowns() 是否进行任何与网络相关的活动？
嗨@greeble31，是的，是的！但它是一个非阻塞 API 调用；事实上，该应用程序可以在没有互联网的情况下启动。而且，即使应用程序会在启动 Activity 之前进行 API 调用，获得响应的时间也不到第二次。谢谢你的评论！ ??????
嗯，这就是我的目标；可能是您的主线程由于某种原因被阻塞。如果您可以在附加调试器的情况下重现此问题，我建议您在 30 秒内进入调试器，并检查线程“main”的状态。

标签： android android-intent firebase-cloud-messaging android-notifications android-pendingintent

【解决方案1】：

将 PendingIntent.FLAG_ONE_SHOT 添加到您的待处理意图。

stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT|PendingIntent.FLAG_ONE_SHOT);

还将 android:exported="true" 添加到清单中的活动标记

【讨论】：

首先，感谢您的回答。你能解释一下这将如何解决这个问题吗？我阅读了有关FLAG_ONE_SHOT 的文档：指示此PendingIntent 只能使用一次的标志；关于exported：其他应用程序的组件是否可以调用该服务或与之交互。听起来与我的主题无关；不过，我会试试你的解决方案。

【解决方案2】：

试试这个，它对我有用。

Intent notificationIntent = new Intent(this, MainActivity.class);
        /*flags for resume activity*/
        notificationIntent.setFlags( Intent.FLAG_ACTIVITY_SINGLE_TOP
                |Intent.FLAG_ACTIVITY_CLEAR_TASK
                |Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent,
                PendingIntent.FLAG_UPDATE_CURRENT);
        builder.setContentIntent(contentIntent);
        /*for clear notification on click*/
        builder.setAutoCancel(true);

【讨论】：