===トラブル===
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====Googleサインインを利用したときに、PlatformException(sign_in_failed, com.google.android.gms.common.api.ApiException: 10: , null)エラー====
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*[https://developers.google.com/android/guides/client-auth フィンガープリントの作成]
*デフォルトパスワードは <code>android</code>
*keystore共有
**http://kyokushin.hatenablog.com/entry/2015/01/27/165529
====flutter doctor --android-licenses でエラー====
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<pre>
calcutta:tenarai_online hirotoyagi$ flutter doctor --android-licenses
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:73)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 5 more
</pre>