android - RealmConfiguration中的android领域错误
问题描述
我是 Realm 数据库中的新手......这是在 Realm DB 中写入字符串并读取它的应用程序......
当我运行我的应用程序时,它显示它已停止
我在 RealmConfiguration 目录中的错误,如 logcat 中所示...
这是我的代码:
ObjectRealm 类
public class ObjectRealm extends RealmObject {
@PrimaryKey
private int id;
private String myTitle ;
public ObjectRealm() {
}
public ObjectRealm(int id, String myTitle) {
this.id = id;
this.myTitle = myTitle;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getMyTitle() {
return myTitle;
}
public void setMyTitle(String myTitle) {
this.myTitle = myTitle;
}
@Override
public String toString() {
return "ObjectRealm{" +
"id=" + id +
", myTitle='" + myTitle + '\'' +
'}';
}
}
BaseApplication 类
public class BaseApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
String rootPath = Environment.getExternalStorageDirectory().getAbsolutePath();
Realm.init(this);
RealmConfiguration config = new RealmConfiguration.Builder()
.name("myRealm")
.directory(new File(rootPath + "/in MyFile/"))
.build();
Realm realm = Realm.getInstance(config);
}
}
主要活动
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Realm realm = Realm.getDefaultInstance();
realm.beginTransaction();
for(int i =0 ;i<5;i++){
ObjectRealm person = new ObjectRealm(i+1 ,"Title number : " + i+1);
}
realm.commitTransaction();
showMe();
}
private void showMe() {
Realm realm = Realm.getDefaultInstance();
RealmQuery<ObjectRealm> query = realm.where(ObjectRealm.class);
RealmResults<ObjectRealm> result = query.findAll();
for (ObjectRealm e : result) {
Log.d("asd", "showMe: " + e.toString());
}
}
}
我的清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.lenovo.tryrealm">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<application
android:name=".BaseApplication"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
我添加了写入和读取外部存储的权限以及 BaseApplication 的名称
为什么它不工作?我的错误在哪里?
当我更改代码时
BaseApplication 类
像这样
public class BaseApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(this)
.build();
Realm.setDefaultConfiguration(realmConfiguration);
}
}
我遇到了这样的错误
error: Builder(Context) is not public in Builder; cannot be accessed from outside package
RealmConfiguration realmConfig = new RealmConfiguration.Builder(this).build();
解决方案
@Override
public void onCreate() {
super.onCreate();
RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(this)
.build();
Realm.setDefaultConfiguration(realmConfiguration);
}
应该
@Override
public void onCreate() {
super.onCreate();
Realm.init(this);
RealmConfiguration realmConfiguration = new RealmConfiguration.Builder()
.build();
Realm.setDefaultConfiguration(realmConfiguration);
}
自 Realm 2.0.0 及更新版本
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