Question

java.lang.NoSuchMethodError：类中没有虚方法zzbqo（）Z. LCOM /谷歌/火力/ FirebaseApp;或其超级类（声明＆＃39; com.google.firebase.FirebaseApp＆＃39;出现在 /data/app/woolamania.in.woolamania-2/base.apk）在com.google.firebase.database.FirebaseDatabase.getInstance（未知资源）在com.google.firebase.database.FirebaseDatabase.getInstance（未知资源） at woolamania.in.woolamania.Home.onCreate（Home.java:32）在android.app.Activity.performCreate（Activity.java:6093）

Home.java类的代码是 -

public class Home extends AppCompatActivity实现了View.OnClickListener {

TextView points;
Button freeRoll,lottery;
DatabaseReference mdatabase;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home);
    Firebase.setAndroidContext(this);
    mdatabase= FirebaseDatabase.getInstance().getReference("User");
    Query query= mdatabase
            .orderByChild("email")
            .equalTo("aroravishal8991@gmail.com");

    query.addListenerForSingleValueEvent(new ValueEventListener() {

        @Override


        public void onDataChange(DataSnapshot dataSnapshot) {

            if(!dataSnapshot.exists()){
                Toast.makeText(getApplicationContext(),"in first if and dsnap dont exist",Toast.LENGTH_SHORT).show();
            }


             for(DataSnapshot singleSnapshot: dataSnapshot.getChildren()){

                if(singleSnapshot.exists()){
                    Toast.makeText(getApplicationContext(),"already exists",Toast.LENGTH_SHORT).show();
                }

             }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

Answer 1

请确保您已将此代码写成依赖项：

dependencies {
  // ...
  implementation 'com.google.firebase:firebase-core:16.0.4'
  // for real-time database
  implementation com.google.firebase:firebase-database:16.0.3
}

java.lang.NoSuchMethodError：类Lcom / google / firebase / FirebaseApp中没有虚方法zzbqo（）Z;或者它的超级课程

1 个答案: