Play Services GCM's technical principles in the Java library
Play Services GCM's technical principles in the Java library interpretation
Play Services GCM (Google Cloud Messaging) is a reliable and efficient message transmission service for sending push notifications between Android devices.When using the Play Services GCM Java class library, it is crucial to follow the following technical principles.This article will interpret these principles and provide the necessary Java code examples.
1. Import Play Services GCM Library
Before using Play Services GCM in the Java library, it is necessary to add it to the dependence of the project.For this reason, add the following dependencies to the project's Build. Gradle file:
dependencies {
implementation 'com.google.android.gms:play-services-gcm:17.4.0'
}
2. Get GCM registration token
By registering an application instance and obtaining GCM registered token, you can receive push notifications on Android devices.The following is a sample code for obtaining GCM registration token:
FirebaseInstanceId.getInstance().getInstanceId()
.addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
@Override
public void onComplete(@NonNull Task<InstanceIdResult> task) {
if (!task.isSuccessful()) {
Log.w(TAG, "getInstanceId failed", task.getException());
return;
}
// Get GCM registration token
String token = task.getResult().getToken();
Log.d(TAG, "GCM Token: " + token);
}
});
3. Send a push notice to the designated device
Using Play Services GCM, you can send a push notification to a specific device or equipment group.Here are examples of sending push notifications to a single device:
String token = "<gcm register token>" "";
RemoteMessage message = new RemoteMessage.Builder("<SENDER_ID>@gcm.googleapis.com")
.addData("message", "Hello from Play Services GCM")
.build();
FirebaseMessaging.getInstance().send(message);
4. Process the receiving push notification
When the Android device receives the Play Services GCM push notification, you can use the following example code to process them:
public class MyGcmReceiver extends GcmReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Bundle bundle = intent.getExtras();
String message = bundle.getString("message");
// Process the receiving push notification
Log.d(TAG, "Received message: " + message);
}
}
5. Customized push notification
You can use custom style and layout to create personalized push notifications.The following is an example code that uses a custom layout:
private void showNotification(String message) {
// Custom notification layout
RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.custom_notification_layout);
remoteViews.setTextViewText(R.id.notification_message, message);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID)
.setSmallIcon(R.drawable.ic_notification)
.setCustomContentView(remoteViews)
.setAutoCancel(true);
NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
notificationManager.notify(notificationId, builder.build());
}
By following the above technical principles, you can get the best push notification experience when using the Java library of Play Services GCM.I hope this article can help you!
