我正在尝试使用Realm作为我的应用程序中的高分数据库。但是，当调用这行代码时：
realmConfig = new RealmConfiguration.Builder(getActivity().getApplicationContext()).build();
在Fragment中我试图保存用户的分数，我明白了：
FATAL EXCEPTION: main
Process: com.tommy.mastersproject, PID: 21387
Theme: themes:{com.android.settings=overlay:com.cyngn.hexo, default=overlay:system, iconPack:system, fontPkg:system, com.android.systemui=overlay:system, com.android.systemui.navbar=overlay:system}
java.lang.NoClassDefFoundError: Failed resolution of: Lio/realm/RealmConfiguration$Builder;
at com.tommy.mastersproject.fragments.MemoryRecallFragment.onCreate(MemoryRecallFragment.java:144)
at android.support.v4.app.Fragment.performCreate(Fragment.java:1951)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1029)
at android.support.v4.app.BackStackRecord.setLastIn(BackStackRecord.java:779)
at android.support.v4.app.BackStackRecord.calculateFragments(BackStackRecord.java:802)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:660)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617)
at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:339)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:601)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1238)
at android.app.Activity.performStart(Activity.java:6268)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2413)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2510)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.ClassNotFoundException: Didn't find class "io.realm.RealmConfiguration$Builder" on path: DexPathList[[dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-support-annotations-23.4.0_d80f4a0fc2ae8e1f7cf76e4c536a48795da28487-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-slice_9-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-slice_8-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-slice_7-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-slice_6-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-slice_5-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-slice_4-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-slice_3-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-slice_2-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-slice_1-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-slice_0-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-library-2.4.0_e0d22a6e7ea9a4d2326a0c8c16bbc09d4d04442c-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-internal_impl-23.4.0_bd67bdb6ef0c094e8f4157e2567e8b30b9d0dd7f-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-com.jakewharton-butterknife-8.0.1_9246a0d023a2de89ba20a84f0fb1ecc6b733b004-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-com.code-troopers.betterpickers-library-3.0.0_f98f8b23c6650d93d8479a647f8f2162db8834e8-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-com.astuetz-pagerslidingtabstrip-1.0.1_474986b4f5d06e547dc72e3bf0988a95fa9d3973-classes.dex", dex file "/data/data/com.tommy.mastersproject/files/instant-run/dex/slice-com.android.support-support-vector-dr
我也尝试过使用
realm = Realm.getDefaultInstance();
但没有任何运气。
从谷歌的快速搜索中，也出现了类似的抱怨，这是因为Realm与Android多指标的兼容性差，而且与Gradle不是最新的，但我目前正在运行Gradle 2.1.2。
答案 0 :(得分：4)
我也在使用Gradle 2.1.2并且Realm工作得非常好，问题可能出现在Instant Run中，您是否尝试在没有Instant Run的情况下加载项目？如果没有禁用它（在Android工作室 - ＆gt;偏好设置 - ＆gt;构建，执行，部署 - ＆gt;即时运行），请清理项目并再次运行。
如果它不起作用，请分享您创建RealmConfiguration和使用Realm的实际代码。