android - 默认 FirebaseApp 未在进程中初始化（错误）

Question

我正在开发一个 firebase 应用程序，我只需将内容保存到 firebase 中的实时数据库即可。我在 logcat 中有一个错误说

“原因：java.lang.IllegalStateException：默认 FirebaseApp 未在此进程 com.example.myfirebase 中初始化。请务必先调用 FirebaseApp.initializeApp(Context)。 ”

即使在初始化 FirebaseApp 之后，我的应用程序也会崩溃。请帮帮我。

package com.example.myfirebase;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import com.google.firebase.FirebaseApp;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class MainActivity extends AppCompatActivity {

    private EditText name,email;
    private Button save;

    DatabaseReference databaseReference;

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

        name = (EditText) findViewById(R.id.editText3);
        email = (EditText) findViewById(R.id.editText4);
        save = (Button) findViewById(R.id.button);

        FirebaseApp.initializeApp(this);

        databaseReference = FirebaseDatabase.getInstance().getReference().child("Users");


        save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                AddData();
            }
        });
    }

    public void AddData(){
        String Name = name.getText().toString().trim();
        String Email = email.getText().toString().trim();

        SaveData saveData = new SaveData(Name,Email);

        databaseReference.setValue(saveData);
    }

}

我想将内容保存到数据库。

标签： androidfirebasefirebase-realtime-database

Answer 1

Please try:

Add FirebaseApp.initializeApp(this); in your application class not in Activity.

Create class extends Application

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

In Android Manifest:

<application
    android:name=".MyApplication">
</application>