我无法连接到Firebase。这可能是导致此错误的原因。 我使用的是Android的最新版本。请参阅idea.log中捕获的以下错误
2017-06-13 13:04:39,507 [21393897] INFO - s.RepoProgressIndicatorAdapter - Downloading https://dl.google.com/android/repository/addons_list-3.xml
2017-06-13 13:04:59,317 [21413707] INFO - er.configure.SourcesTableModel - IOException: https://dl.google.com/android/repository/addons_list-3.xml
2017-06-13 13:04:59,318 [21413708] INFO - er.configure.SourcesTableModel - java.io.IOException: Cannot download 'https://dl.google.com/android/repository/addons_list-3.xml': connect timed out
2017-06-13 13:04:59,321 [21413711] INFO - er.configure.SourcesTableModel - Downloading https://dl.google.com/android/repository/addons_list-2.xml
2017-06-13 13:04:59,526 [21413916] INFO - s.RepoProgressIndicatorAdapter - IOException: https://dl.google.com/android/repository/addons_list-3.xml
2017-06-13 13:04:59,527 [21413917] INFO - s.RepoProgressIndicatorAdapter - java.io.IOException: Cannot download 'https://dl.google.com/android/repository/addons_list-3.xml': connect timed out
2017-06-13 13:04:59,535 [21413925] INFO - s.RepoProgressIndicatorAdapter - Downloading https://dl.google.com/android/repository/addons_list-2.xml
2017-06-13 13:05:19,328 [21433718] INFO - er.configure.SourcesTableModel - IOException: https://dl.google.com/android/repository/addons_list-2.xml
2017-06-13 13:05:19,328 [21433718] INFO - er.configure.SourcesTableModel - java.io.IOException: Cannot download 'https://dl.google.com/android/repository/addons_list-2.xml': connect timed out
2017-06-13 13:05:19,329 [21433719] INFO - er.configure.SourcesTableModel - Downloading https://dl.google.com/android/repository/addons_list-1.xml
2017-06-13 13:05:19,543 [21433933] INFO - s.RepoProgressIndicatorAdapter - IOException: https://dl.google.com/android/repository/addons_list-2.xml
2017-06-13 13:05:19,543 [21433933] INFO - s.RepoProgressIndicatorAdapter - java.io.IOException: Cannot download 'https://dl.google.com/android/repository/addons_list-2.xml': connect timed out
2017-06-13 13:05:19,545 [21433935] INFO - s.RepoProgressIndicatorAdapter - Downloading https://dl.google.com/android/repository/addons_list-1.xml
2017-06-13 13:05:39,332 [21453722] INFO - er.configure.SourcesTableModel - IOException: https://dl.google.com/android/repository/addons_list-1.xml
2017-06-13 13:05:39,332 [21453722] INFO - er.configure.SourcesTableModel - java.io.IOException: Cannot download 'https://dl.google.com/android/repository/addons_list-1.xml': connect timed out
2017-06-13 13:05:39,332 [21453722] WARN - er.configure.SourcesTableModel - Failed to download any source lists!
2017-06-13 13:05:39,551 [21453941] INFO - s.RepoProgressIndicatorAdapter - IOException: https://dl.google.com/android/repository/addons_list-1.xml
2017-06-13 13:05:39,551 [21453941] INFO - s.RepoProgressIndicatorAdapter - java.io.IOException: Cannot download 'https://dl.google.com/android/repository/addons_list-1.xml': connect timed out
2017-06-13 13:05:39,551 [21453941] WARN - s.RepoProgressIndicatorAdapter - Failed to download any source lists!
2017-06-13 13:05:39,553 [21453943] INFO - s.RepoProgressIndicatorAdapter - Downloading https://dl.google.com/android/repository/repository2-1.xml
2017-06-13 13:05:59,612 [21474002] WARN - s.RepoProgressIndicatorAdapter - java.io.IOException: Cannot download 'https://dl.google.com/android/repository/repository2-1.xml': connect timed out
2017-06-13 13:05:59,615 [21474005] INFO - s.RepoProgressIndicatorAdapter - Downloading file:/C:/Program%20Files/Android/Android%20Studio/plugins/sdk-updates/offline-repo/offline-repo.xml