我已经安装了Android Studio最新版本1.5。但我从来没有建立过hello world项目，因为为项目建设的gradle正在永远运行。
这些是AS日志：
2016-03-08 15:14:24,355 [ 0] INFO - #com.intellij.idea.Main - ------------------------------------------------------ IDE STARTED ------------------------------------------------------
2016-03-08 15:14:24,867 [ 512] INFO - #com.intellij.idea.Main - IDE: Android Studio (build #AI-141.2178183, 19 Aug 2015 00:00)
2016-03-08 15:14:24,867 [ 512] INFO - #com.intellij.idea.Main - OS: Windows 7 (6.1, x86)
2016-03-08 15:14:24,867 [ 512] INFO - #com.intellij.idea.Main - JRE: 1.8.0_73-b02 (Oracle Corporation)
2016-03-08 15:14:24,867 [ 512] INFO - #com.intellij.idea.Main - JVM: 25.73-b02 (Java HotSpot(TM) Server VM)
2016-03-08 15:14:24,908 [ 553] INFO - #com.intellij.idea.Main - JVM Args: -Xms256m -Xmx750m -XX:MaxPermSize=350m -XX:ReservedCodeCacheSize=150m -XX:+UseConcMarkSweepGC -XX:SoftRefLRUPolicyMSPerMB=50 -ea -Djna.nosys=true -Djna.boot.library.path= -Djna.debug_load=true -Djna.debug_load.jna=true -Dsun.io.useCanonCaches=false -Djava.net.preferIPv4Stack=true -Didea.paths.selector=AndroidStudio1.3 -Didea.platform.prefix=AndroidStudio -Djb.vmOptions=C:\Program Files\Android\Android Studio\bin\studio.exe.vmoptions -Xbootclasspath/a:C:\Program Files\Android\Android Studio\lib\boot.jar -Didea.jre.check=false
2016-03-08 15:14:25,511 [ 1156] INFO - #com.intellij.idea.Main - JNA library loaded (32-bit) in 603 ms
2016-03-08 15:14:25,546 [ 1191] INFO - penapi.util.io.win32.IdeaWin32 - Native filesystem for Windows is operational
2016-03-08 15:14:25,574 [ 1219] INFO - #com.intellij.idea.Main - Using "FocusKiller" library to prevent focus stealing.
2016-03-08 15:14:33,199 [ 8844] INFO - llij.ide.plugins.PluginManager - 28 plugins initialized in 1591 ms
2016-03-08 15:14:33,203 [ 8848] INFO - llij.ide.plugins.PluginManager - Loaded bundled plugins: Android NDK Support (1.0), Android Support (10.1.3.2), CVS Integration (11), Copyright (8.1), Coverage, EditorConfig (1.0), Git Integration (8.1), GitHub, Google Cloud Testing (1.0), Google Cloud Tools For Android Studio (0.2.8), Google Login (1.0), Google Services (0.1), Gradle, Groovy (9.0), I18n for Java, IDEA CORE, IntelliLang (8.0), JUnit (1.0), Java Bytecode Decompiler (0.1), JavaFX (1.0), Maven Integration, Properties Support, SDK Updater (1.0), Subversion Integration (1.1), Task Management (1.0), Terminal (0.1), TestNG-J (8.0), hg4idea (10.0)
2016-03-08 15:14:38,075 [ 13720] INFO - ellij.concurrency.JobScheduler - 50 ms execution limit failed for: com.intellij.openapi.progress.impl.CoreProgressManager$1@6d52b; elapsed time was 55ms
2016-03-08 15:14:38,150 [ 13795] INFO - ellij.util.io.PagedFileStorage - lower=100; upper=200; buffer=10; max=739246080
2016-03-08 15:14:38,412 [ 14057] INFO - api.vfs.impl.local.FileWatcher - Starting file watcher: C:\Program Files\Android\Android Studio\bin\fsnotifier.exe
2016-03-08 15:14:38,490 [ 14135] INFO - api.vfs.impl.local.FileWatcher - Native file watcher is operational.
2016-03-08 15:14:41,844 [ 17489] INFO - lij.diagnostic.DebugLogManager - Set DEBUG for the following categories: []
2016-03-08 15:14:44,532 [ 20177] INFO - rains.ide.BuiltInServerManager - built-in server started, port 63343
2016-03-08 15:14:51,798 [ 27443] INFO - TestNG Runner - Create TestNG Template Configuration
2016-03-08 15:14:52,545 [ 28190] INFO - ellij.project.impl.ProjectImpl - 21 project components initialized in 4439 ms
2016-03-08 15:14:52,545 [ 28190] INFO - le.impl.ModuleManagerComponent - 0 module(s) loaded in 0 ms
2016-03-08 15:15:03,549 [ 39194] INFO - pl.stores.ApplicationStoreImpl - 88 application components initialized in 30087 ms
2016-03-08 15:15:04,818 [ 40463] INFO - .intellij.idea.IdeaApplication - App initialization took 44843 ms
2016-03-08 15:15:15,861 [ 51506] INFO - TestNG Runner - Create TestNG Template Configuration
2016-03-08 15:15:18,193 [ 53838] INFO - ellij.project.impl.ProjectImpl - 142 project components initialized in 6884 ms
2016-03-08 15:15:19,046 [ 54691] INFO - le.impl.ModuleManagerComponent - 2 module(s) loaded in 853 ms
2016-03-08 15:15:30,622 [ 66267] INFO - indexing.UnindexedFilesUpdater - Indexable files iterated in 8454 ms
2016-03-08 15:15:31,511 [ 67156] INFO - #com.jetbrains.cidr.lang - Clearing symbols finished in 0 s.
2016-03-08 15:15:31,613 [ 67258] INFO - #com.jetbrains.cidr.lang - Loading symbols finished in 0 s.
2016-03-08 15:15:31,721 [ 67366] INFO - #com.jetbrains.cidr.lang - Building symbols finished in 0 s.
2016-03-08 15:15:31,806 [ 67451] INFO - #com.jetbrains.cidr.lang - Saving symbols finished in 0 s.
2016-03-08 15:15:38,983 [ 74628] INFO - ls.idea.gradle.GradleSyncState - Started sync with Gradle for project 'Hello'.
2016-03-08 15:15:42,082 [ 77727] INFO - s.plugins.gradle.GradleManager - Instructing gradle to use java from C:/Program Files/Java/jdk1.8.0_40
2016-03-08 15:15:42,170 [ 77815] INFO - s.plugins.gradle.GradleManager - Instructing gradle to use java from C:/Program Files/Java/jdk1.8.0_40
2016-03-08 15:15:42,798 [ 78443] INFO - util.EmbeddedDistributionPaths - Looking for embedded Maven repo at 'C:\Program Files\Android\Android Studio\gradle\m2repository'
2016-03-08 15:15:44,554 [ 80199] INFO - .project.GradleExecutionHelper - Passing command-line args to Gradle Tooling API: [-Pandroid.injected.build.model.only=true, -Pandroid.injected.build.model.only.advanced=true, -Pandroid.injected.invoked.from.ide=true, --init-script, C:\Users\Administrator\AppData\Local\Temp\asLocalRepo53.gradle, --init-script, C:\Users\Administrator\AppData\Local\Temp\ijinit31.gradle]
2016-03-08 15:16:03,871 [ 99516] INFO - tartup.impl.StartupManagerImpl - D:\Project\Hello\.idea\misc.xml case-sensitivity: false
2016-03-08 15:16:09,525 [ 105170] INFO - lij.tasks.impl.TaskManagerImpl - Updating issues cache (every 20 min)
2016-03-08 15:16:10,723 [ 106368] INFO - CompilerWorkspaceConfiguration - Available processors: 4
2016-03-08 15:16:11,201 [ 106846] INFO - attrs.AttributeDefinitionsImpl - Found tag with unknown parent: AndroidManifest.AndroidManifestCompatibleScreens
2016-03-08 15:16:11,201 [ 106846] INFO - attrs.AttributeDefinitionsImpl - Found tag with unknown parent: AndroidManifest.AndroidManifestSupportsInput
2016-03-08 15:16:17,403 [ 113048] INFO - tor.impl.FileEditorManagerImpl - Project opening took 66279 ms
2016-03-08 15:16:19,021 [ 114666] INFO - nject.config.XPathSupportProxy - XPath Support is not available
2016-03-08 15:19:48,535 [ 324180] INFO - on.console.RunIdeConsoleAction - Loading javax.script.* engines...
2016-03-08 15:19:49,052 [ 324697] INFO - on.console.RunIdeConsoleAction - org.codehaus.groovy.jsr223.GroovyScriptEngineFactory: *.groovy: Groovy/2.3.9 (Groovy Scripting Engine/2.0)
2016-03-08 15:20:29,379 [ 365024] WARN - options.ex.ConfigurableWrapper - XML does not provide id for class com.android.tools.idea.run.CloudTestingConfigurable
2016-03-08 15:20:30,007 [ 365652] WARN - ConfigurableExtensionPointUtil - Can't find parent for project.propCompiler (Compiler)
2016-03-08 15:25:18,774 [ 654419] WARN - options.ex.ConfigurableWrapper - XML does not provide id for class com.android.tools.idea.run.CloudTestingConfigurable
2016-03-08 15:25:18,782 [ 654427] WARN - ConfigurableExtensionPointUtil - Can't find parent for project.propCompiler (Compiler)
2016-03-08 15:28:49,224 [ 864869] INFO - tools.idea.ddms.adb.AdbService - Initializing adb using: C:\Users\Administrator\AppData\Local\Android\sdk\platform-tools\adb.exe, client support = true
2016-03-08 15:28:54,211 [ 869856] INFO - tools.idea.ddms.adb.AdbService - Successfully connected to adb
2016-03-08 15:28:54,213 [ 869858] INFO - nitor.AndroidToolWindowFactory - Successfully obtained debug bridge
2016-03-08 15:29:04,093 [ 879738] INFO - android.run.AndroidDebugRunner - device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
Try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.
com.android.ddmlib.AdbCommandRejectedException: device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
Try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.
at com.android.ddmlib.AdbHelper.setDevice(AdbHelper.java:855)
at com.android.ddmlib.AdbHelper.executeRemoteCommand(AdbHelper.java:458)
at com.android.ddmlib.AdbHelper.executeRemoteCommand(AdbHelper.java:388)
at com.android.ddmlib.AdbHelper.executeRemoteCommand(AdbHelper.java:357)
at com.android.ddmlib.Device.executeShellCommand(Device.java:568)
at org.jetbrains.android.util.AndroidUtils.executeCommandOnDevice(AndroidUtils.java:396)
at org.jetbrains.android.logcat.AndroidLogcatUtil.startLogging(AndroidLogcatUtil.java:67)
at org.jetbrains.android.logcat.AndroidLogcatUtil.access$100(AndroidLogcatUtil.java:46)
at org.jetbrains.android.logcat.AndroidLogcatUtil$4.run(AndroidLogcatUtil.java:132)
at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:400)
at java.util.concurrent.Executors$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)
at org.jetbrains.ide.PooledThreadExecutor$1$1.run(PooledThreadExecutor.java:56)
2016-03-08 15:29:58,949 [ 934594] INFO - openapi.editor.impl.EditorImpl - Cache hits:4096, total requests:4317,null