因此,我們已經找到了解決方案(當收到通知時,將應用程序置于前臺),即使已經有一段時間了,我仍在發布它：

> FCM通知(firebase云消息傳遞通知)只需在通知中發送“數據”.因此,通知的JSON結構中沒有Notification對象,只有數據.這樣,通知便由您應用的FirebaseMessagingService.java類處理.請詳細閱讀以下內容,以了解如何處理兩種FCM通知類型.

https://firebase.google.com/docs/cloud-messaging/android/receive

https://firebase.google.com/docs/cloud-messaging/concept-options#notifications_and_data_messages

>在FirebaseMessagingService.java類中,使用Intent啟動VideoCall活動.不要忘記將此服務添加到Manifest.xml中

Intent intent = new Intent(this, VideoCallActivity.class);

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

getApplicationContext().startActivity(intent);

>在VideoCall活動中,確保在onCreate()的開頭具有以下代碼：

// These flags ensure that the activity can be launched when the screen is locked.

Window window = getWindow();

window.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED

| WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON

| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

// to wake up screen

PowerManager pm = (PowerManager) getApplicationContext().getSystemService(Context.POWER_SERVICE);

PowerManager.WakeLock wakeLock = pm.newWakeLock((PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP), "TAG");

wakeLock.acquire();

// to release screen lock

KeyguardManager keyguardManager = (KeyguardManager) getApplicationContext().getSystemService(Context.KEYGUARD_SERVICE);

KeyguardManager.KeyguardLock keyguardLock = keyguardManager.newKeyguardLock("TAG");

keyguardLock.disableKeyguard();

>使用相應的intent-filter將VideoCallActivity添加到Manifest.xml中：

????android：name =“.ui.activities.video_call.VideoCallActivity”

????android：launchMode =“ singleTop”

????android：screenOrientation =“ portrait”

????android：theme =“ @ style / AppTheme.NoActionBar”>

????

????????

????????< action android：name =“ VIDEO_CALLING” />

????????< category android：name =“ android.intent.category.DEFAULT” />

????< / intent-filter>

< / activity>

可選的：

要使電話響起并振動：

// For Incoming Call

// 1. declare

private MediaPlayer incomingCallMediaPlayer;

// .2 in onCreate, if I'm the person that's calling, ring the phone

incomingCallMediaPlayer = MediaPlayer.create(this, R.raw.incoming);

incomingCallMediaPlayer.setLooping(true);

incomingCallMediaPlayer.start();

// 3. when I pick up, stop the player

incomingCallMediaPlayer.stop();

// I play R.raw.incoming if I'm being called.

// I play R.raw.outgoing when I'm calling.

// I understand if I'm the one calling from the number of participants in the "room" (this is a video call terminology) and by passing in a variable through the intent

// For Outgoing Call

// 1. declare

private MediaPlayer callingMediaPlayer;

// 2. in onCreate, if I'm being called, ring the phone

callingMediaPlayer = MediaPlayer.create(this, R.raw.outgoing);

callingMediaPlayer.setLooping(true);

callingMediaPlayer.start();

// 3. when another "participant" (this is a video call terminology) joins the "room" I stop playing the sound

callingMediaPlayer.stop();

// to Vibrate, add the code with the media players and stop vibrate with media players

//https://stackoverflow.com/questions/13950338/how-to-make-an-android-device-vibrate

總結

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