에러에 대한 질문입니다..

Question

07-05 07:18:33.219 15800-15800/com.xx.xx/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.test.test, PID: 15800
    java.lang.NoSuchMethodError: No virtual method zzbqo()Z in class Lcom/google/firebase/FirebaseApp; or its super classes (declaration of 'com.google.firebase.FirebaseApp' appears in /data/app/com.test.test-wJTBlSb_TVd0SlsiJs5b7A==/base.apk)
        at com.google.firebase.database.FirebaseDatabase.getInstance(Unknown Source:129)
        at com.google.firebase.database.FirebaseDatabase.getInstance(Unknown Source:22)
        at com.test.test.MainActivity.<init>(MainActivity.java:28)
        at java.lang.Class.newInstance(Native Method)
        at android.app.Instrumentation.newActivity(Instrumentation.java:1174)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2669)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6494)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

다음과 같이 에러가 출력되었는데요

에러 해석좀 해주세요

at com.test.test.MainActivity.<init>(MainActivity.java:28)여기서 문제인거 같은데

package com.xx.xx;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class MainActivity extends AppCompatActivity {

    private String CHAT_NAME;
    private String USER_NAME;

    private ListView chat_view;
    private EditText chat_edit;
    private Button chat_send;

    private FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();
    private DatabaseReference databaseReference = firebaseDatabase.getReference();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dto);

        // 위젯 ID 참조
        chat_view = (ListView) findViewById(R.id.chat_view);
        chat_edit = (EditText) findViewById(R.id.chat_edit);
        chat_send = (Button) findViewById(R.id.chat_sent);

        // 로그인 화면에서 받아온 채팅방 이름, 유저 이름 저장
        Intent intent = getIntent();
        CHAT_NAME = intent.getStringExtra("chatName");
        USER_NAME = intent.getStringExtra("userName");

        // 채팅 방 입장
        openChat(CHAT_NAME);

        // 메시지 전송 버튼에 대한 클릭 리스너 지정
        chat_send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (chat_edit.getText().toString().equals(""))
                    return;

                DTO chat = new DTO(USER_NAME, chat_edit.getText().toString()); //ChatDTO를 이용하여 데이터를 묶는다.
                databaseReference.child("chat").child(CHAT_NAME).push().setValue(chat); // 데이터 푸쉬
                chat_edit.setText(""); //입력창 초기화

            }
        });
    }

    private void addMessage(DataSnapshot dataSnapshot, ArrayAdapter<String> adapter) {
        DTO chatDTO = dataSnapshot.getValue(DTO.class);
        adapter.add(chatDTO.getUserName() + " : " + chatDTO.getMessage());
    }

    private void removeMessage(DataSnapshot dataSnapshot, ArrayAdapter<String> adapter) {
        DTO DTO = dataSnapshot.getValue(DTO.class);
        adapter.remove(DTO.getUserName() + " : " + DTO.getMessage());
    }

    private void openChat(String chatName) {
        // 리스트 어댑터 생성 및 세팅
        final ArrayAdapter<String> adapter

                = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1);
        chat_view.setAdapter(adapter);

        // 데이터 받아오기 및 어댑터 데이터 추가 및 삭제 등..리스너 관리
        databaseReference.child("chat").child(chatName).addChildEventListener(new ChildEventListener() {
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                addMessage(dataSnapshot, adapter);
                Log.e("LOG", "s:"+s);
            }

            @Override
            public void onChildChanged(DataSnapshot dataSnapshot, String s) {

            }

            @Override
            public void onChildRemoved(DataSnapshot dataSnapshot) {
                removeMessage(dataSnapshot, adapter);
            }

            @Override
            public void onChildMoved(DataSnapshot dataSnapshot, String s) {

            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });
    }
}

 

 

Answer 1

databaseReference 선언해놓고.. 인스턴스화는 진행하였나요?

 안보이는데요. 바로 child를 호출하는 것 같은데..

Comments

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