webview android怎样实现推送通知

在Android WebView中实现推送通知，需要结合使用WebView和Firebase Cloud Messaging (FCM) 服务。以下是实现步骤：

1. 设置Firebase项目：

   • 在Firebase控制台中创建一个新的项目。
   • 将Android应用添加到Firebase项目中，并下载google-services.json文件。
   • 将google-services.json文件复制到Android项目的app目录下。

2. 配置Android项目：

   • 在build.gradle（Module: app）文件中添加Firebase依赖：

     buildscript {
         dependencies {
             classpath 'com.google.gms:google-services:4.3.10'
         }
     }
     
     apply plugin: 'com.google.gms.google-services'
     
     dependencies {
         implementation 'com.google.firebase:firebase-messaging:23.0.0'
     }
     

   • 在AndroidManifest.xml文件中添加必要的权限和服务声明：

     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     
     <application
         ...
         <service
             android:name=".MyFirebaseMessagingService">
             <intent-filter>
                 <action android:name="com.google.firebase.MESSAGING_EVENT" />
             </intent-filter>
         </service>
         <receiver
             android:name=".MyFirebaseMessagingReceiver">
             <intent-filter>
                 <action android:name="com.google.firebase.MESSAGING_EVENT" />
             </intent-filter>
         </receiver>
     </application>
     

3. 实现FCM服务：

   • 创建MyFirebaseMessagingService类来处理消息接收：

     public class MyFirebaseMessagingService extends FirebaseMessagingService {
         @Override
         public void onMessageReceived(RemoteMessage remoteMessage) {
             // 处理接收到的消息
             if (remoteMessage.getNotification() != null) {
                 // 显示通知
                 NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "default")
                         .setSmallIcon(R.drawable.ic_notification)
                         .setContentTitle("FCM Message")
                         .setContentText(remoteMessage.getNotification().getBody())
                         .setAutoCancel(true);
                 NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
                 notificationManager.notify(0, builder.build());
             }
         }
     }
     

   • 创建MyFirebaseMessagingReceiver类来处理错误消息：

     public class MyFirebaseMessagingReceiver extends FirebaseMessagingReceiver {
         @Override
         public void onMessageReceived(RemoteMessage remoteMessage) {
             // 处理错误消息
         }
     }
     

4. 在WebView中显示通知：

   • 在WebView加载页面时，检查是否有新的消息，并显示通知：

     public class MainActivity extends AppCompatActivity {
         private WebView webView;
     
         @Override
         protected void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
             setContentView(R.layout.activity_main);
     
             webView = findViewById(R.id.webview);
             WebSettings webSettings = webView.getSettings();
             webSettings.setJavaScriptEnabled(true);
             webView.loadUrl("https://your-webview-url.com");
     
             FirebaseMessaging.getInstance().subscribeToTopic("your-topic")
                     .addOnCompleteListener(task -> {
                         if (!task.isSuccessful()) {
                             // 处理订阅失败
                         }
                     });
         }
     
         @Override
         protected void onMessageReceived(RemoteMessage remoteMessage) {
             super.onMessageReceived(remoteMessage);
             if (remoteMessage.getNotification() != null) {
                 // 显示通知
                 NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "default")
                         .setSmallIcon(R.drawable.ic_notification)
                         .setContentTitle("FCM Message")
                         .setContentText(remoteMessage.getNotification().getBody())
                         .setAutoCancel(true);
                 NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
                 notificationManager.notify(0, builder.build());
             }
         }
     }
     

通过以上步骤，你可以在Android WebView中实现推送通知功能。当有新消息时，WebView会自动显示通知。