Android studio btn（按钮）步骤显示错误和间隙Ad不工作

我已尝试添加btn（按钮）设置。但它给出了错误并破坏了我的应用程序。请帮忙

@凌驾 创建时受保护的void（Bundle savedInstanceState） { super.onCreate（savedInstanceState）； setContentView（R.layout.activity_main）

Logcat错误

2019-10-17 19:52:57.633 5045-5204/? E/IptablesRestoreController: [iptables debug]iptables-restore execute *filter
    -D fw_powersave -m owner --uid-owner 10161 -j RETURN
    COMMIT
2019-10-17 19:52:57.676 5045-5204/? E/IptablesRestoreController: [iptables debug]iptables-restore execute done *filter
    -D fw_powersave -m owner --uid-owner 10161 -j RETURN
    COMMIT
    , res : 0
2019-10-17 19:53:01.261 5045-5204/? E/IptablesRestoreController: [iptables debug]iptables-restore execute *filter
    -A fw_standby_uid -m owner --uid-owner 9510025 -j DROP
    COMMIT
2019-10-17 19:53:01.305 5045-5204/? E/IptablesRestoreController: [iptables debug]iptables-restore execute done *filter
    -A fw_standby_uid -m owner --uid-owner 9510025 -j DROP
    COMMIT
    , res : 0

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从Logcat发布stacktrace错误。现在请检查我已上传Logcat错误。

2019-10-17 19:52:57.633 5045-5204/? E/IptablesRestoreController: [iptables debug]iptables-restore execute *filter
    -D fw_powersave -m owner --uid-owner 10161 -j RETURN
    COMMIT
2019-10-17 19:52:57.676 5045-5204/? E/IptablesRestoreController: [iptables debug]iptables-restore execute done *filter
    -D fw_powersave -m owner --uid-owner 10161 -j RETURN
    COMMIT
    , res : 0
2019-10-17 19:53:01.261 5045-5204/? E/IptablesRestoreController: [iptables debug]iptables-restore execute *filter
    -A fw_standby_uid -m owner --uid-owner 9510025 -j DROP
    COMMIT
2019-10-17 19:53:01.305 5045-5204/? E/IptablesRestoreController: [iptables debug]iptables-restore execute done *filter
    -A fw_standby_uid -m owner --uid-owner 9510025 -j DROP
    COMMIT
    , res : 0