小编ili*_*ask的帖子

我正在尝试将新的Google Maps Android API v2合并到使用Android支持库的应用程序中.我已经经历了很多迭代,试图到某个地方工作,现在我已经放弃了,我想我应该在这里问.

我转到API控制台,创建了一个项目,为Android启用了Google Maps API v2,根据需要创建了一个调试KEY并将其粘贴到清单上.没有身份验证问题或类似的事情.很确定我做对了.

在我的项目libs文件夹中,我放置android-support-v4.jar(通过项目右键单击 - > Android->添加支持库...).在Eclipse中,我将File-> Import-> Android-> Existing Android Code To Intospace导入并导入最新的(rev 3)android-sdk/google/google_play_services/libproject/google-play-services_lib.然后我将它作为依赖库添加到我的项目中(项目右键单击 - >属性 - > Android->将其添加为底部的库依赖项.

在我的清单中我有:

<manifest xmlns:android="http://schemas.android.com/apk/res/android" ...>
    <permission
      android:name="myapp.permission.MAPS_RECEIVE"
      android:protectionLevel="signature"/>

    <All the uses-permission required like INTERNET, ACCESS_NETWORK_STATE, WRITE_EXTERNAL_STORAGE, FINE AND COARSE LOCATION, etc>
    <uses-permission android:name="myapp.permission.MAPS_RECEIVE"/>
    <uses-feature android:glEsVersion="0x00020000" android:required="true"/>
    <application ...>
        ...
        <uses-library android:name="com.google.android.maps" />
        <meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="AI..."/>
    </application>

在我的mainview.xml中,我有:

<fragment
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:id="@+id/map"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   class="com.google.android.gms.maps.SupportMapFragment" />

现在在MainView.java上我有:

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager; …

我有两个型号.

@Entity
public class Student
{
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    protected long id;

    @?
    protected Address homeAddress;

    @?
    protected Address schoolAddress;
}

@Entity
public class Address
{
   @Id
   @GeneratedValue(strategy=GenerationType.AUTO)
   protected long id;

   @?
   protected List<Student> students;
}

做什么JPA /休眠批注我需要把上面homeAddress,schoolAddress并且students使协会工作？

当然,我尝试了很多东西,没有任何效果.例如,设置

    @ManyToOne
    @JoinColumn (name="student_homeAddress_id", updatable = false, insertable = false)
    protected Address homeAddress;

    @ManyToOne
    @JoinColumn (name="student_schoolAddress_id", updatable = false, insertable = false)
    protected Address schoolAddress;

和

    @OneToMany(cascade={CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REFRESH}, fetch = FetchType.EAGER)
    @JoinColumns({
    @JoinColumn(name = "student_homeAddress_id", referencedColumnName …