一个简单的login案例，提交数据到服务器模拟登录，以前用的AS2.2，现在升级到3.2.1就不行了。之前一直用的是API19，没什么问题，现在API28一堆
could not find class 'android.support.v4.....'的错误，没有抛异常，
查了一下说要把AVD的API升级到28，结果还是不行，变成了这样
2019-03-04 15:44:50.346 1958-1970/system_process E/memtrack: Couldn't load memtrack module
2019-03-04 15:44:52.836 1958-1979/system_process E/memtrack: Couldn't load memtrack module
2019-03-04 15:44:53.258 1707-2033/? E/installd: Failed to delete /data/app/vmdl152882847.tmp: No such file or directory
2019-03-04 15:44:54.883 1702-2407/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
2019-03-04 15:44:55.107 1702-2407/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
2019-03-04 15:44:56.920 1958-2127/system_process E/TaskPersister: File error accessing recents directory (directory doesn't exist?).
2019-03-04 15:45:13.157 1958-1979/system_process E/memtrack: Couldn't load memtrack module
并没有抛异常，点击按钮提交数据毫无反应，代码和之前一毛一样，网上也没有找到什么靠谱的方法，但jsp正常，控制台能打印服务器接收到的数据，请问各位大神是什么原因？
