Execution failed for task ':app:transformClassesWithInstantRunForDebug'.
Execution failed for task ':app:transformClassesWithInstantRunForDebug'.
> com.android.build.api.transform.TransformException: java.lang.RuntimeException: java.lang.RuntimeException: java.io.IOException: Failed to find byte code for com/lzy/okgo/callback/StringCallback
InstantRun出现问题；
解决方案：
File ->Setting->Build,Execution...->Instant Run->取消使用InstantRun的勾选