ClassCastException异常：不能转换为android.app.Activity [英] ClassCastException: cannot be cast to android.app.Activity

问题描述

我有一个片段的名单，我想一个新的活动启动时，我美元的列表P $ PSS的东西。我只试着用我的第一选择，但是当我尝试它，我得到的错误：

I have a list in a fragment and I want a new activity to start when I press something in that list. I have only tried with my first option but when I try it I get the error:

03-20 15:16:13.017: E/AndroidRuntime(941): Caused by: java.lang.ClassCastException: com.test.test.Algebra cannot be cast to android.app.Activity

下面是我的片段类：

public class FragmentTest extends SherlockListFragment {

String formler[]= {
        "Algebra",
        "Aritmetik",
        "Differential- och integralkalkyl",
        "Funktioner",
        "Geometri",
        "Komplexa tal",
        "Statistik och sannolikhet",
        "Trigonometri"
};

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    setListAdapter(new ArrayAdapter<String>(getActivity().getBaseContext(), android.R.layout.simple_list_item_1, formler));

    return super.onCreateView(inflater, container, savedInstanceState);
}

@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    // TODO Auto-generated method stub
    super.onListItemClick(l, v, position, id);
    String choice = formler[position];
    try{
        @SuppressWarnings("rawtypes")
        Class choiceClass = Class.forName("com.test.test." + choice);
        Intent startIntent = new Intent(getActivity().getBaseContext(), choiceClass);
        startActivity(startIntent);
    }catch(ClassNotFoundException e){
        e.printStackTrace();
    }
}

}

我在做什么错了？

推荐答案

确保代数是扩展的活动，你也可以简单的发起这样的新意图（currectActivity.this，代数的活动。类）;

Make sure that Algebra is extending an activity and also you can simple initiate an activity like this new Intent(currectActivity.this, Algebra.class);

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