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由于谷歌已宣布chromebook也支持"Android应用程序",所以我也想在chromebook上支持我的应用程序,虽然它运行良好,但我需要修复一些例外.

我想以这样的方式编写代码,即只对chromebook执行,并且不会为Android手机和平板电脑执行代码.

我在Android开发者网站上查看了Chromebook文档,我没有得到任何这样的API,告诉你的应用程序在chrome book环境中运行.

ARC Beta文档中的建议不起作用:

如果您需要检查您的应用是否在Chrome操作系统上运行,请查找铬作为android.os.Build.BRAND和android.os.Build.MANUFACTURER.

两者都在华硕Chromebook上返回谷歌.

在BSOD(蓝屏死机)之后,我有下一个gradle构建错误:FAILURE:构建失败并出现异常.

• 出了什么问题:java.lang.NullPointerException(没有错误消息)

• 尝试:使用--info或--debug选项运行以获取更多日志输出.

• 例外情况是:

java.lang.NullPointerException 
at  org.gradle.api.internal.changedetection.state.TreeSnapshotRepository.removeTreeSnapshotUsage(TreeSnapshotRepository.java:85) 
at  org.gradle.api.internal.changedetection.state.CacheBackedFileSnapshotRepository.remove(CacheBackedFileSnapshotRepository.java:47)                   
at  org.gradle.api.internal.changedetection.state.CacheBackedTaskHistoryRepository$1$1.run(CacheBackedTaskHistoryRepository.java:81)
at  org.gradle.internal.Factories$1.create(Factories.java:22)               
at  org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:192)
at  org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:175)
at  org.gradle.cache.internal.DefaultPersistentDirectoryStore.useCache(DefaultPersistentDirectoryStore.java:106)
at  org.gradle.cache.internal.DefaultCacheFactory$ReferenceTrackingCache.useCache(DefaultCacheFactory.java:187)
at  org.gradle.api.internal.changedetection.state.DefaultTaskArtifactStateCacheAccess.useCache(DefaultTaskArtifactStateCacheAccess.java:60)
at  org.gradle.api.internal.changedetection.state.CacheBackedTaskHistoryRepository$1.update(CacheBackedTaskHistoryRepository.java:66)
at  org.gradle.api.internal.changedetection.changes.DefaultTaskArtifactStateRepository$TaskArtifactStateImpl.afterTask(DefaultTaskArtifactStateRepository.java:135)
at  org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:68)
at  org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
at  org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:52)
at  org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
at  org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
at  org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
at  org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:203)
at  org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:185)
at  org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:66)
at  org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:50)
at  org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:25)
at  org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:110)
at  org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37)
at  org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)
at  org.gradle.execution.DefaultBuildExecuter.access$000(DefaultBuildExecuter.java:23)
at  org.gradle.execution.DefaultBuildExecuter$1.proceed(DefaultBuildExecuter.java:43)
at  org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
at  org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)
at  org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30)
at  org.gradle.initialization.DefaultGradleLauncher$4.run(DefaultGradleLauncher.java:153)
at  org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
at  org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:53)
at  org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:150)
at  org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:32)
at  org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:98)
at  org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:92)
at …

当我的Android应用程序代码从云消息传递平台接收数据并尝试将该数据放在地图上时,我收到上述错误 -

    java.lang.IllegalStateException: Not on the main thread
    at maps.w.c.a(Unknown Source)
    at maps.y.F.a(Unknown Source)
    at maps.ad.u.b(Unknown Source)
    at vo.onTransact(:com.google.android.gms.DynamiteModulesB:92)
    at android.os.Binder.transact(Binder.java:380)
    at com.google.android.gms.maps.internal.IGoogleMapDelegate$zza$zza.animateCamera(Unknown Source)
    at com.google.android.gms.maps.GoogleMap.animateCamera(Unknown Source)
    at com.pabba.mtracker.tracking.view.TrackingActivity.onLocationReceived(TrackingActivity.java:54)

以下是我的演示者(我在我的Android应用程序中使用MVP模式)从云消息传递服务接收位置消息时调用的代码.

@Override
public void onLocationReceived(LatLng latLng) {
    Log.i(TAG, latLng.toString());
    mGoogleMap.addPolyline(new PolylineOptions().add(latLng));
    mGoogleMap.animateCamera(CameraUpdateFactory.newCameraPosition(new CameraPosition.Builder().target(latLng)
            .zoom(13).build()));
}

并且addPolyLine函数调用中发生错误.请告诉我如何解决它.