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我正在尝试设置Firebase通知.我在应用级别和根级别build.gradle中进行了更改.但是,它仍然在MyFirebaseMessagingService的Manifest中给出了错误.错误是未解决的类.

<?xml version="1.0" encoding="utf-8"?>

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">


        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <action android:name="com.google.firebase.MESSAGING_EVENT"/>
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".s" />
    <activity android:name=".im" />
    <activity android:name=".Main2Activity" />
    <activity android:name=".sactivity" />
    <service
        android:name=".MyFirebaseMessagingService">
        <intent-filter>
            <action android:name="com.google.firebase.MESSAGING_EVENT"/>
        </intent-filter>
    </service>
    <activity
        android:name=".ScrollingActivity"
        android:label="@string/title_activity_scrolling"
        android:theme="@style/AppTheme.NoActionBar"></activity>
</application>

我正在使用Firebase Google登录。它可以通过USB调试完美运行。但是，当我生成签名的APK时，它将停止工作。它无法登录。在Android 5.1和Android 6.0.1上使用它。另外，如果Google Play服务未更新，则会提示用户更新该服务，因为该用户可能会退出该应用。如何关闭提示并解决错误？

public class MainActivity extends AppCompatActivity implements  GoogleApiClient.OnConnectionFailedListener,
        View.OnClickListener {
private Button skip;
    private static final String TAG = "GoogleActivity";
    private static final int RC_SIGN_IN = 9001;
    private ProgressBar pb;
    // [START declare_auth]
    private FirebaseAuth mAuth;
    // [END declare_auth]

    // [START declare_auth_listener]
    private FirebaseAuth.AuthStateListener mAuthListener;
    // [END declare_auth_listener]

    private GoogleApiClient mGoogleApiClient;
    private TextView mStatusTextView;
    private TextView mDetailTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        pb=(ProgressBar)findViewById(R.id.signpro);
        pb.setVisibility(View.GONE);
        skip=(Button)findViewById(R.id.btnskip);
        skip.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) …