Question1： 出现android.os.ParcelableException: java.io.IOException: Requested internal only, but not enough space
step:手机不够需要删除一些app.
Question2：installation failed with message null.
It is possible that this issue is resolved by uninstalling an existing version of the apk if it is present, and then re-installing.
WARNING: Uninstalling will remove the application data!
Do you want to uninstall the existing application?
step1:点击左上角File—>Settings—>Build,Execution,Deployment—>Instant Run
step2:不选中复选框Enable Instant Run to hot swap code/resource changes on deploy(default enabled) step3：依次点击OK。重新运行程序。