艾特了系统推荐,打扰见谅。错误如下图:
报错信息: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lish.cloudcommunity.cloudcommunity/com.lish.cloudcommunity.cloudcommunity.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.GridView.setAdapter(android.widget.ListAdapter)' on a null object reference
报错信息: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lish.cloudcommunity.cloudcommunity/com.lish.cloudcommunity.cloudcommunity.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.GridView.setAdapter(android.widget.ListAdapter)' on a null object reference
你的 recyclerview 或者listview 没有 执行 findviewById。
或者 你可以先用 baseadapter 试试 ,