修改Build.Gradle内容,把

classpath 'com.android.tools.build:gradle:2.0.0-alpha1'

改为

classpath 'com.android.tools.build:gradle:2.0.+'

App build.gradle:

compile 'com.android.support:recyclerview-v7:21.0.0'
compile 'com.android.support:cardview-v7:21.0.0'

改为

compile 'com.android.support:recyclerview-v7:22.0.0' // latest 23.1.1
compile 'com.android.support:cardview-v7:22.0.0' // latest 23.1.1

重新clean然后build即可。

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