dependencies {
classpath ‘com.android.tools.build:gradle:3.1.1’
classpath “io.objectbox:objectbox-gradle-plugin:$objectboxVersion”
}
}
然后，在 Module 级别的 build.gradle 文件里添加如下脚本：
dependencies {
// 这一句是添加 RxJava 扩展
compile ‘io.objectbox:objectbox-rxjava:0.9.8’
// 下面这两句是 ObjectBox 很骚气的一个功能——DataBrowser, 通过浏览器来调试和浏览数据库的数据
debugImplementation “io.objectbox:objectbox-android-objectbrowser:
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objectboxVersion" releaseImplementation "io.objectbox:objectbox-android:
objectboxVersion"releaseImplementation"io.objectbox:objectbox−android:objectboxVersion”
}
// ObjectBox browser dependencies must be set before applying the plugin so it does not add objectbox-android
// (would result in two conflicting versions, e.g. “Duplicate files copied in APK lib/armeabi-v7a/libobjectbox.so”).
apply plugin: ‘io.objectbox’
注意这里的 apply plugin: ‘io.objectbox’ 一定要添加到 dependencies 模块后面（已经踩过这个坑了，直接按照官网的 Get Started 的集成方式有点问题）。
ObjectBox 简单用法 在 Application 中初始化:
public static final String TAG = “ObjectBoxExample”;
public static final boolean EXTERNAL_DIR = false;
private BoxStore boxStore;
@Override
public void onCreate() {
super.onCreate();
boxStore = MyObjectBox.builder().androidContext(App.this).build();
if (BuildConfig.DEBUG) {
new AndroidObjectBrowser(boxStore).start(this);
}
Log.d(“App”, “Using ObjectBox " + BoxStore.getVersion() + " (” +
BoxStore.getVersionNative() + “)”);
}
public BoxStore getBoxStore() {
return boxStore;
}
实体类格式（最简单的只要加两个注解就够了，更详细的用法可以参考官方文档）：
package io.objectbox.example;
import java.util.Date;
import io.objectbox.annotation.Entity;
import io.objectbox.annotation.Generated;
import io.objectbox.annotation.Id;
import io.objectbox.annotation.apihint.Internal;
@Entity
public class Note {
// 注意这里的 @Id 注解是必须的，和 GreenDao 不同，GreenDao 可以省略，但是如果你的业务字段已经有了 一个名字为 id 的字段，可以取一个别的名字啊~
@Id
long boxId;
String text;
String comment;
Date date;
public Note(long id, String text, String comment, Date date) {
this.boxId = id;
this.text = text;
this.comment = comment;
this.date = date;
}
public Note() {
}
public long getId() {
return this.boxId;
}
public void setId(long id) {
this.boxId = id;
}
public String getText() {
return this.text;
}
public void setText(String text) {
this.text = text;
}
public String getComment() {
return this.comment;
}
public void setComment(String comment) {
this.comment = comment;
}
public Date getDate() {
return this.date;
}
public void setDate(Date date) {
this.date = date;
}
}
在 Activity 执行查询（多余的业务代码已经被我省略）：
public class NoteActivity extends Activity {
private Box notesBox;
private Query notesQuery;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
BoxStore boxStore = ((App) getApplication()).getBoxStore();
notesBox = boxStore.boxFor(Note.class);
// query all notes, sorted a-z by their text
(http://greenrobot.org/objectbox/documentation/queries/)
notesQuery = notesBox.query().order(Note_.text).build();
updateNotes();
}
private void updateNotes() {
List notes = notesQuery.find();
}
private void addNote() {
Note note = new Note();
note.setText(noteText);
note.setComment(comment);
note.setDate(new Date());
notesBox.put(note);
Log.d(App.TAG, "Inserted new note, ID: " + note.getId());
}
}
ObjectBox 的 Reactive 用法 同样在 Activity 中执行查询：
public class ReactiveNoteActivity extends Activity {
private Box notesBox;
private Query notesQuery;
private DataSubscriptionList subscriptions = new DataSubscriptionList();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
notesBox = ((App) getApplication()).getBoxStore().boxFor(Note.class);
// query all notes, sorted a-z by their text
// (http://greenrobot.org/objectbox/documentation/queries/)
notesBox = ((App) getApplication()).getBoxStore().boxFor(Note.class);
// query all notes, sorted a-z by their text
// (http://greenrobot.org/objectbox/documentation/queries/)
