Type mismatch: cannot convert from MainFragment to Fragment 報錯

源碼：

1         FragmentTransaction mFragmentTranscation = getSupportFragmentManager().beginTransaction();
2         Fragment mMainFragment = new MainFragment();//此行提示出錯
3         mFragmentTranscation.replace(R.id.container, mMainFragment);
4         mFragmentTranscation.commit();

 

錯誤提示：無法將MainFragment (Fragment的子類)強制轉換成Fragment

解決方法：

在原來的MainFragment中把

import android.app.Fragment;

更改爲:

import android.support.v4.app.Fragment;