AS-Fragment-cannot resolve method add();
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喵喵喵~fragmentTransaction调用add()；出现各种报错啦~~啊呜，怎么办，
一种是把MainActivity.java的
import android.app.Fragment;改成import android.support.v4.app.Fragment;但我的情况下还是不行哇呜~~~啊啊啊看了下add()里的参数类型，补成了add(0,R.id.myfragment,mf)，看到第二个参数不对，居然是int型，怎么回事，喵喵喵~跑到myfragment.java试了一下把里面的import android.support.v4.app.Fragment;，改成import android.app.Fragment;可以啦~~~万岁~~~~万岁~~~~
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