レルムデータベース/アプリケーションが起動時にクラッシュする/レルム設定を作成する前にrealm.init（コンテキスト）を呼び出す

Question

私はAndroidの初心者で、チュートリアルを見ながらレルムデータベースを作成しようとしています。しかし、私のアプリは起動しません、それはクラッシュします。私の主な考え方は、近くのお店、場所、お店の種類（レストラン、カフェなど）、お店が見つからない場合は店を追加するオプションマップにマーカーをピンで固定し、名前とタイプを選択します）。エラーで私を与えるcall realm.init(context) before creating a realm configuration誰でも私はそれを感謝するのを助けることができます。このアプリは私の卒業プロジェクトです。私はこれまでにこれまでに到達しました。 MainScreen.java

public class MainScreen extends AppCompatActivity { 
private ImageButton btn; 
Animation scale; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main_screen); 
    scale = AnimationUtils.loadAnimation(this, R.anim.gps_button_animation); 
    btn = (ImageButton) findViewById(R.id.ImageButton); 
    btn.startAnimation(scale); 

} 

public void InfoActivity(View view) { 
    Intent intent = new Intent(this, InfoActivity.class); 
    startActivity(intent); 
} 

public void MapsActivity (View view){ 
    Intent intent = new Intent(this, MapsActivity.class); 
    startActivity(intent); 
} 

public void Anazitisi (View view){ 
    Intent intent = new Intent(this, Anazitisi.class); 
    startActivity(intent); 
} 

public void AddShopActivity (View view){ 
    Intent intent = new Intent(this, AddShopActivity.class); 
    startActivity(intent); 
} 
} 

AddShopActivity.java

import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Spinner; 
import android.widget.TextView; 
import android.widget.Toast; 

import com.example.konarx.a11042016.ShopProperties.Shop; 

import io.realm.Realm; 
import io.realm.RealmResults; 

public class AddShopActivity extends MainScreen{ 

private EditText editText_name; 
private Spinner spinner; 
private ArrayAdapter<CharSequence> adapter; 
private Button button_save; 
private Realm realm; 
private TextView textView_log; 


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

    realm = Realm.getDefaultInstance(); 

    editText_name = (EditText) findViewById(R.id.editName); 
    button_save = (Button) findViewById(R.id.buttonSave); 
    textView_log = (TextView) findViewById(R.id.textView_Log); 
    spinner = (Spinner)findViewById(R.id.spinner); 
    adapter = ArrayAdapter.createFromResource(this,R.array.eidoskatastimatos, android.R.layout.simple_spinner_item); 
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
    spinner.setAdapter(adapter); 
    spinner.setOnItemSelectedListener(new android.widget.AdapterView.OnItemSelectedListener(){ 

     @Override 
     public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { 
      Toast.makeText(getBaseContext(), adapterView.getItemAtPosition(i)+" selected", Toast.LENGTH_LONG).show(); 
     } 

     @Override 
     public void onNothingSelected(AdapterView<?> adapterView) { 

     } 
    }); 

    button_save.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      save_into_database(editText_name.getText().toString().trim(), spinner.getAdapter().toString().trim()); 
      refresh_views(); 
     } 
    }); 




} 

private void refresh_views() { 
    RealmResults<Shop> shopRealmResults = realm.where(Shop.class).findAll(); 
    String output = ""; 
    for (Shop shop: shopRealmResults){ 
     output += shop.toString(); 
    } 
    textView_log.setText(output); 
} 

private void save_into_database(final String title, final String type) { 
    realm.executeTransactionAsync(new Realm.Transaction() { 
     @Override 
     public void execute(Realm bgRealm) { 
      Shop shop = bgRealm.createObject(Shop.class); 
      shop.setTitle(title); 
      shop.setType(type); 
     } 
    }, new Realm.Transaction.OnSuccess() { 
     @Override 
     public void onSuccess() { 
      Log.v("Database", "saved!"); 
     } 
    }, new Realm.Transaction.OnError() { 
     @Override 
     public void onError(Throwable error) { 
      Log.v("Database", error.getMessage()); 
     } 
    }); 
} 

@Override 
protected void onDestroy() { 
    super.onDestroy(); 
    realm.close(); 
} 
} 

Shop.java

package com.example.konarx.a11042016.ShopProperties; 


import io.realm.RealmObject; 
import io.realm.annotations.PrimaryKey; 

public class Shop extends RealmObject{ 

@PrimaryKey 
private int id; 

private String title; 

private String type; 

private String Latitude; 

private String Longitude; 

// Standard getters & setters 
public int getId() { 
    return id; 
} 

public void setId(int id) { 
    this.id = id; 
} 

public String getTitle() { 
    return title; 
} 

public void setTitle(String title) { 
    this.title = title; 
} 

public String getType() { 
    return type; 
} 

public void setType(String type) { 
    this.type = type; 
} 

public String getLatitude() { 
    return Latitude; 
} 

public void setLatitude(String latitude) { 
    Latitude = latitude; 
} 

public String getLongitude() { 
    return Longitude; 
} 

public void setLongitude(String longitude) { 
    Longitude = longitude; 
} 

@Override 
public String toString() { 
    return "Shop{" + 
      "id=" + id + 
      ", title='" + title + '\'' + 
      ", type='" + type + '\'' + 
      ", Latitude='" + Latitude + '\'' + 
      ", Longitude='" + Longitude + '\'' + 
      '}'; 
} 
} 

BaseApplication.java

import android.app.Application; 

import io.realm.Realm; 
import io.realm.RealmConfiguration; 

public class BaseApplication extends Application{ 
@Override 
public void onCreate() { 
    super.onCreate(); 

    RealmConfiguration config = new RealmConfiguration.Builder().build(); 
    Realm.setDefaultConfiguration(config); 
} 
} 

のAndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.example.konarx.a11042016"> 

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 
<uses-permission android:name="android.permission.INTERNET" /> 
<uses-feature android:name="android.hardware.location.gps" /> 

<application 
    android:allowBackup="true" 
    android:icon="@drawable/logo" 
    android:label="@string/app_name" 
    android:name=".BaseApplication" 
    android:supportsRtl="true" 
    android:theme="@style/AppTheme"> 
    <activity android:name=".MainScreen"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 

    <activity 
     android:name=".InfoActivity" 
     android:label="Πληροφορίες"></activity> 

    <meta-data 
     android:name="com.google.android.geo.API_KEY" 
     android:value="@string/google_maps_key" /> 

    <activity 
     android:name=".MapsActivity" 
     android:label="Χάρτης"></activity> 

    <activity 
     android:name=".Anazitisi" 
     android:label="Αναζήτηση"></activity> 

    <activity 
     android:name=".AddShopActivity" 
     android:label="Προσθήκη Καταστήματος"></activity> 

</application> 

</manifest> 

Answer 1

public class BaseApplication extends Application{ 
    @Override 
    public void onCreate() { 
     super.onCreate(); 
     Realm.init(this); // add this line 
     RealmConfiguration config = new RealmConfiguration.Builder().build(); 
     Realm.setDefaultConfiguration(config); 
    } 
    }