“FCM”应用程序在此行崩溃getToken（）“java.lang.IllegalStateException：默认FirebaseApp未在此过程中初始化”[重复]

Question

FCM（Firebase 云消息传递）初始化问题

我开始研究 FCM 模块，我按照 Firebase 指南进行了休闲。我遇到了两个异常，例如 RuntimeException 和 IllegalStateException。 Firebase 初始化默认值，但 FCM 中出现问题的原因和原因。

1。从 Android Studio 工具 -> Firebase -> 云消息传递。

2。我闲暇了设置 Firebase 云消息传递。

我在下面链接：

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

应用程序：Build.gradle

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    //noinspection GradleCompatible
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.google.firebase:firebase-messaging:17.4.0'
    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'
}

apply plugin: 'com.google.gms.google-services'

项目：Build.gradle

buildscript {
    repositories {
        google()
        jcenter()
        
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.3.2'
        classpath 'com.google.gms:google-services:4.1.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

在 MainActivity.class 中，我试图获取令牌但应用程序崩溃。

 public class MainActivity extends AppCompatActivity {

    public static final String TAG = MainActivity.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        String tokenId = FirebaseInstanceId.getInstance().getToken(); //Crashes in this line 
        Log.d("SH", tokenId);
    }
}

在 logcat 中我有两个异常

 E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.package PID: 29368
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.package.testfcm/com.package.MainActivity}: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.package. Make sure to call FirebaseApp.initializeApp(Context) first.
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2861)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2943)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1630)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6626)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811)
     Caused by: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.package. Make sure to call FirebaseApp.initializeApp(Context) first.
        at com.google.firebase.FirebaseApp.getInstance(com.google.firebase:firebase-common@@16.0.2:240)
        at com.google.firebase.iid.FirebaseInstanceId.getInstance(Unknown Source:1)
        at com.package.MainActivity.onCreate(MainActivity.java:20)
        at android.app.Activity.performCreate(Activity.java:7032)
        at android.app.Activity.performCreate(Activity.java:7023)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1236)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2814)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2943) 
        at android.app.ActivityThread.-wrap11(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1630) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:6626) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811) 

终于找到了解决办法，现在我可以拿到FCM Token了。

在项目 build.gradle 文件中你需要添加单行代码代码，即 mavenLocal()。

按照以下解决方案交叉检查项目：build.gradle 文件和应用程序：build.gradle 文件。

项目：build.gradle

buildscript {
    repositories {
        mavenLocal()  //This is the line you need to add 
        google()
        jcenter()

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.3.2'
        classpath 'com.google.gms:google-services:4.2.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        mavenLocal() //This is the line you need to add 
        google()
        jcenter()

    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

应用程序：build.gradle

apply plugin: 'com.android.application'


android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.testfcm"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    //noinspection GradleCompatible
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'


    implementation 'com.google.firebase:firebase-core:16.0.8'
    implementation 'com.google.firebase:firebase-iid:17.1.1'
    implementation 'com.google.firebase:firebase-messaging:17.5.0'

    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'
}
apply plugin: 'com.google.gms.google-services'

Answer 1

试试这个方法。


在 Android Studio 中转到工具菜单。
然后选择 Firebase 选项。
提供您启用了 Firebase 的 google 帐户 id-password。
从右侧选项卡中选择云消息传递。
然后点击 setup firebase messages 。
按照那边的mension步骤。

Answer 2

我可以从您的代码中看到，您在必须初始化 Firebase 实例之前就获得了它。您必须先初始化它，然后使用getInstance() 获取令牌。

FirebaseApp.initializeApp(this);

或者尝试谷歌文档显示获取令牌的方式

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 new Instance ID token
                String token = task.getResult().getToken();


                Toast.makeText(MainActivity.this, token, Toast.LENGTH_SHORT).show();
            }
        });