RxJava 购物车

一，依赖 compile 'com.jakewharton:butterknife:8.4.0' compile 'io.reactivex.rxjava2:rxjava:2.0.1' compile 'io.reactivex.rxjava2:rxandroid:2.0.1' compile 'com.squareup.retrofit2:retrofit:2.3.0' compile 'com

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