Firebase 实例 ID 令牌不会显示

Question

我正在开发一个Android应用程序，我已经创建了令牌来发送推送通知，但令牌没有显示。

同时也没有任何错误。

我正在使用firebase云消息服务来生成令牌。

这是我的应用程序等级文件

apply plugin: 'com.android.application'
android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.example.visvasrithilakshan.myapplication"
        minSdkVersion 24
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.google.firebase:firebase-messaging:11.8.0'
    // implementation 'com.google.firebase:firebase-messaging:17.3.4'
    //implementation 'com.google.firebase:firebase-auth:11.6.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.squareup.retrofit2:retrofit:2.3.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
    implementation 'com.android.support:cardview-v7:26.1.0'
}
apply plugin: 'com.google.gms.google-services'

这是我的构建等级文件

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.4'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
       // classpath 'com.google.gms:google-services:3.1.1'
        classpath 'com.google.gms:google-services:4.0.2'
    }
}
allprojects {
    repositories {
        google()
        jcenter()
    }
}
task clean(type: Delete) {
    delete rootProject.buildDir
}

这是我的MyFirebaseInstanceIdService.java

import android.util.Log;
import com.google.firebase.iid.FirebaseInstanceId;
import com.google.firebase.iid.FirebaseInstanceIdService;
public class MyFirebaseInstanceIdService extends FirebaseInstanceIdService {
    @Override
    public void onTokenRefresh() {
        // Get updated InstanceID token.
        String refreshedToken = FirebaseInstanceId.getInstance().getToken();
        Log.d("myfirebaseid", "Refreshed token: " + refreshedToken);
        // If you want to send messages to this application instance or
        // manage this apps subscriptions on the server side, send the
        // Instance ID token to your app server.
        //sendRegistrationToServer(refreshedToken);
    }
}

Answer 1

逐步：

1( 转到根级别的build.gradle文件，在依赖项下添加此行classpath 'com.google.gms:google-services:4.2.0'或更低版本的

2( 转到你的应用程序构建渐变文件，并在底部添加此行：apply plugin: 'com.google.gms.google-services'

3( 前往Firebase控制台下载google-services.json文件并将其放在app文件夹下

4( 实施您的服务：

public class MyFirebaseInstanceIdService extends FirebaseInstanceIdService {
    private static String TAG = "FirebaseInstance";
    @Override
    public void onTokenRefresh() {
        // Get updated InstanceID token.
        String refreshedToken = FirebaseInstanceId.getInstance().getToken();       
        Log.e(TAG, "Refreshed token: " + refreshedToken);        
    }
}

5( 将已实现的服务添加到您的清单：

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

6( 实现您的FirebaseMessagingService并将其添加到清单：

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

仅此而已。

附言：我把它从我自己的项目和所有作品中拿走了。

Answer 2

 FirebaseMessaging.getInstance().getToken().addOnCompleteListener(new OnCompleteListener<String>() {
            @Override
            public void onComplete(@NonNull Task<String> task) {
                if (task.isComplete()) {
                    token[0] = task.getResult();
                    Log.e("AppConstants", "onComplete: new Token got: " + token[0]);
                    Log.d("tokeb", "checking token");
                    Log.d("token", token[0]+ "V");
                    UpdateToken(token[0]); // to Server 
                }
            }
    });

Answer 3

在活动的oncreate 中运行此代码

FirebaseInstanceId.getInstance().getInstanceId().addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
            @Override
            public void onComplete(@NonNull Task<InstanceIdResult> task) {
                String token = task.getResult().getToken();
                Log.i("Token", token);
            }
        });