在 Android Studio 中找不到 BaseGameUtilities 的来源

Question

我已经尝试安装Google Play Services 好几个小时了，但是在尝试到处搜索之后，我似乎无法找到解决问题的方法。我想我已经导入了BaseGameUtils 和PlayGamesServices，Android Studio 现在会在我的应用程序中自动识别它们，这对我来说似乎已经实现了。

但是当我尝试添加登录按钮时

<com.google.android.gms.common.SignInButton
    android:id="@+id/bHighScore"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBaseline="@+id/button1"
    android:layout_alignBottom="@+id/button1"
    android:layout_marginLeft="98dp"
    android:layout_toRightOf="@+id/button1"
    android:text="Highscore"
    />

上面写着

The following classes could not be instantiated:
- com.google.android.gms.common.SignInButton (Open Class, Show Exception)
java.lang.VerifyError: Expecting a stackmap frame at branch target 13

异常详情： 地点： com/google/android/gms/common/SignInButton.setStyle(II)V @1: iflt 原因： 此位置的预期堆栈图帧。

字节码：

0000000: 1b9b 000c 1b06 a200 0704 a700 0403 1206
0000010: 04bd 0014 5903 1bb8 002c 53b8 0028 1c9b
0000020: 000c 1c05 a200 0704 a700 0403 1207 04bd
0000030: 0014 5903 1cb8 002c 53b8 0028 2a1b b500
0000040: 182a 1cb5 0015 2a2a b600 23b7 0027 b1  

at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2658)
at java.lang.Class.getConstructor0(Class.java:2964)
at java.lang.Class.getConstructor(Class.java:1812)
at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:310)
at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:100)
at com.android.tools.idea.rendering.LayoutlibCallback.loadView(LayoutlibCallback.java:172)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:207)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:132)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:802)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:778)
at android.view.LayoutInflater.inflate(LayoutInflater.java:500)
at android.view.LayoutInflater.inflate(LayoutInflater.java:381)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:400)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:329)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:332)
at com.android.tools.idea.rendering.RenderService$3.compute(RenderService.java:575)
at com.android.tools.idea.rendering.RenderService$3.compute(RenderService.java:564)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:932)
at com.android.tools.idea.rendering.RenderService.createRenderSession(RenderService.java:564)
at com.android.tools.idea.rendering.RenderService.render(RenderService.java:691)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.doRender(AndroidLayoutPreviewToolWindowManager.java:586)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.access$1900(AndroidLayoutPreviewToolWindowManager.java:80)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$6$1.run(AndroidLayoutPreviewToolWindowManager.java:528)
at com.intellij.openapi.progress.impl.ProgressManagerImpl$2.run(ProgressManagerImpl.java:178)
at com.intellij.openapi.progress.ProgressManager.executeProcessUnderProgress(ProgressManager.java:209)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:212)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:171)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$6.run(AndroidLayoutPreviewToolWindowManager.java:523)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)
at com.intellij.util.ui.update.MergingUpdateQueue$2.run(MergingUpdateQueue.java:254)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)
at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)
at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
at com.intellij.util.Alarm$Request$1.run(Alarm.java:327)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

当我打开课程时，它说找不到源，我不知道在附加的源中放什么。

任何帮助将不胜感激。

Answer 1

I had this same issue，还有一个编译问题。

如果您尝试编译为 java 8 jdk 字节码，那么问题实际上出在 android 本身——Android 仅支持 here 讨论的 java 7 jdk。但是，如那篇文章中所述，您可以尝试使用retro-lambda，它通过我不明白的巫术将 java 8 字节码转换回 java 7。

这并不意味着你不能使用 jdk 1.8，你只需要编译成 java 7 字节码，因此原生不能使用 java 8 语法糖。

在你的移动 build.gradle 中解决这个问题（这是我的）

apply plugin: 'com.android.application'

android {
    compileSdkVersion 'android-L'
    buildToolsVersion '20.0.0'

    defaultConfig {
        applicationId "com.example"
        minSdkVersion 17
        targetSdkVersion 'L'
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    apply plugin: 'findbugs'
    compile fileTree(dir: 'libs', include: ['*.jar'])
    wearApp project(':wear')
    compile 'com.google.android.gms:play-services:5.0.89'
}

将编译选项更改为：

compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
}