Question

我是Android的新手，我试图通过观看教程来创建Realm数据库。但我的应用程序没有启动，它崩溃了。我的主要想法是用户找到附近的商店，根据他的位置，如果他想要选择商店类型（餐馆，咖啡等），如果他找不到他想要的商店，该应用程序让他可以添加一个购物（通过图钉在地图中标记，选择名称和类型）。在错误中给了我call realm.init(context) before creating a realm configuration无论谁能帮助我都会感激它。这个应用程序是我的毕业设计。我已达到目前为止; 的 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);
}
}

的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);
     }
  }

在创建领域配置之前，领域数据库/应用程序在启动/调用realm.init（上下文）时崩溃

1 个答案: