Failed to resolve: com.android.support:appcompat-v7:23.4.0 问题解决办法: 1.在Android SDK Manager中找到对应的SDK版本,并且选中Extras中的Android Support Repository和Google Repository安装包. 2.选择 Sync Project with Gradle Files,重新编译,然后启动即可解决. adb not responding if youd like to re…