<p>在使用Android Studio 使用默认创建Fragment时，在Activity中 must implement OnFragmentInteractionListener 错误如下：</p><p>Caused by: java.lang.ClassCastException: com.example.fengge.myapplication.MainActivity@534dfca8 must implement OnFragmentInteractionListener</p><p>此时Activity类如下：</p><pre class="brush:html;toolbar:false">publicclassMainActivityextendsFragmentActivity{
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}</pre><p>想要修改错误，只要Activity中实现定义的fragment的OnFragmentInteractionListener</p><p>修改后代码如下：</p><pre class="brush:java;toolbar:false">
publicclassMainActivityextendsFragmentActivityimplementsMyFragment.OnFragmentInteractionListener{
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
publicvoidonFragmentInteraction(Uriuri){
}
}</pre><p>其中 MyFragment是我自己定义的fragment，只要改成自己创建fragment类名即可。</p>