在使用 firebase UI 时，我无法找到明确的 Activity 类 com.firebase.ui.auth.KickoffActivity

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    FirebaseApp.initializeApp(this);
    setContentView(R.layout.activity_main);
    FirebaseApp.initializeApp(this);
    mAuth=FirebaseAuth.getInstance();
    mAuthListner=new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            FirebaseUser user=firebaseAuth.getCurrentUser();
            if(user!=null){
                Toast.makeText(getApplicationContext(),"Sign in success",Toast.LENGTH_SHORT).show();

            }
            else {
                startActivityForResult(AuthUI.getInstance()
                        .createSignInIntentBuilder()
                        .setIsSmartLockEnabled(false)
                        .setProviders(AuthUI.EMAIL_PROVIDER,AuthUI.GOOGLE_PROVIDER).build(),
                        RC_SIGN_IN);
            }
        }
    };
}

完整的错误信息

android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.flamanco.trackme/com.firebase.ui.auth.KickoffActivity}; have you declared this activity in your AndroidManifest.xml? at android.app.Instrumentation.checkStartActivityResult

添加了对 app/.gradle 文件的依赖

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:24.2.1'
    compile 'com.google.firebase:firebase-core:10.0.1'
    compile 'com.google.firebase:firebase-auth:10.0.1'
    compile 'com.firebaseui:firebase-ui-auth:1.1.1'
}

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

还在构建gradle中添加了插件

classpath 'com.google.gms:google-services:3.0.0'

最后，我确实在我的 firebase 控制台项目中添加了 SHA1 指纹。

我是否需要在 list 文件中添加 auth.kickOff Activity

最佳答案

android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.flamanco.trackme/com.firebase.ui.auth.KickoffActivity}; have you declared this activity in your AndroidManifest.xml? at android.app.Instrumentation.checkStartActivityResult

您需要在 AndroidManifest.xml

打开 list 文件并添加 KicoffActivity。

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:installLocation="auto">
<activity
            android:name="KickoffActivity"/>
</manifest>

另外，我不确定你在这里有两次初始 FirebaseApp ..

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    FirebaseApp.initializeApp(this);
    setContentView(R.layout.activity_main);
    FirebaseApp.initializeApp(this);
}

通常在应用类中应该只初始化一次， 在 onCreate() 方法中。

创建一个新的应用程序类..

public class YourApplicationClass extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        FirebaseApp.initializeApp(this);
    }
}

并在 list 中添加相同的内容，

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:installLocation="auto">
<application
        android:name="YourApplicationClass"
        android:allowBackup="false"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:largeHeap="true"
        android:supportsRtl="true"
        android:theme="@style/MyMaterialTheme.Base">
       <activity
        android:name="KickoffActivity"/>
</application>
</manifest>

关于android - 如何解决 Unable to find explicit activity in firebase AuthUi？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45476866/