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情况一：
转载：Google Login null Exception in Android Studio
点击Android Studio右上角登录按钮，出现错误提示：
NullPointerException：NullPointerException
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错误详情：
nulljava.lang.NullPointerException at java.util.prefs.AbstractPreferences.put(AbstractPreferences.java:241) at com.google.gct.login.GoogleLoginPrefs.saveActiveUser(GoogleLoginPrefs.java:172) at com.google.gct.login.CredentialedUserRoster.setActiveUser(CredentialedUserRoster.java:90) at com.google.gct.login.CredentialedUserRoster.addUser(CredentialedUserRoster.java:139) at com.google.gct.login.GoogleLogin$1.notifyOnComplete(GoogleLogin.java:367) at com.google.gct.login.GoogleLogin$1.onSuccess(GoogleLogin.java:351) at com.intellij.openapi.progress.impl.CoreProgressManager.runProcessWithProgressSynchronously(CoreProgressManager.java:371) at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcessWithProgressSynchronously(ProgressManagerImpl.java:76) at com.intellij.openapi.progress.impl.CoreProgressManager.run(CoreProgressManager.java:293) at com.intellij.openapi.progress.Task.queue(Task.java:74) at com.google.gct.login.GoogleLogin.logIn(GoogleLogin.java:322) at com.google.gct.idea.elysium.ProjectSelector$PopupPanel.doLogin(ProjectSelector.java:473) at com.google.gct.login.ui.GoogleLoginEmptyPanel$1.actionPerformed(GoogleLoginEmptyPanel.java:44) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6525) at javax.swing.JComponent.processMouseEvent(JComponent.java:3324) at java.awt.Component.processEvent(Component.java:6290) at java.awt.Container.processEvent(Container.java:2234) at java.awt.Component.dispatchEventImpl(Component.java:4881) at java.awt.Container.dispatchEventImpl(Container.java:2292) at java.awt.Component.dispatchEvent(Component.java:4703) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462) at java.awt.Container.dispatchEventImpl(Container.java:2278) at java.awt.Window.dispatchEventImpl(Window.java:2750) at java.awt.Component.dispatchEvent(Component.java:4703) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86) at java.awt.EventQueue$4.run(EventQueue.java:731) at java.awt.EventQueue$4.run(EventQueue.java:729) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:734) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:565) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:382) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:109) at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:184) at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:229) at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:227) at java.security.AccessController.doPrivileged(Native Method) at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:227) at java.awt.Dialog.show(Dialog.java:1084) at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl$MyDialog.show(DialogWrapperPeerImpl.java:778) at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl.show(DialogWrapperPeerImpl.java:465) at com.intellij.openapi.ui.DialogWrapper.invokeShow(DialogWrapper.java:1614) at com.intellij.openapi.ui.DialogWrapper.show(DialogWrapper.java:1571) at git4idea.DialogManager.showDialog(DialogManager.java:37) at git4idea.DialogManager.show(DialogManager.java:22) at com.google.gct.idea.git.UploadSourceAction.uploadProjectToGoogleCloud(UploadSourceAction.java:133) at com.google.gct.idea.git.UploadSourceAction.actionPerformed(UploadSourceAction.java:109) at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:182) at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter$1.run(ActionMenuItem.java:312) at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:958) at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:124) at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:282) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:109) at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:512) at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:44) at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:532) at java.awt.Component.processMouseEvent(Component.java:6525) at javax.swing.JComponent.processMouseEvent(JComponent.java:3324) at java.awt.Component.processEvent(Component.java:6290) at java.awt.Container.processEvent(Container.java:2234) at java.awt.Component.dispatchEventImpl(Component.java:4881) at java.awt.Container.dispatchEventImpl(Container.java:2292) at java.awt.Component.dispatchEvent(Component.java:4703) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462) at java.awt.Container.dispatchEventImpl(Container.java:2278) at java.awt.Window.dispatchEventImpl(Window.java:2750) at java.awt.Component.dispatchEvent(Component.java:4703) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86) at java.awt.EventQueue$4.run(EventQueue.java:731) at java.awt.EventQueue$4.run(EventQueue.java:729) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:734) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:565) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:382) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
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解决方法：
Actually found how to solve it. in regedit, delete the following path:
HKEY_CURRENT_USER\SOFTWARE\JavaSoft\Prefs\com\google
情况二
错误提示：
Access is allowed from event dispatch thread only.: Access is allowed from event dispatch thread only.
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错误的提示是，事件分发只允许在一个线程里。因为我是使用xx-net翻墙去登录的，所以我分析原因可能是Android Studio触发的登录线程和Google网页返回线程不是同一个线程。是因为Android Studio里的网络访问配置问题
解决方法：
将Android Studio的HTTP proxy设置为翻墙所使用的监听代理127.0.0.1:8087
疑问：为什么使用全局PAC自动代理就不行，知道原因的朋友指点我一下
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