各位大神，问一个安卓小白的问题

public class SecondActivity extends EuclidActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    ImageView back_button = (ImageView) findViewById(R.id.back_button);
    back_button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View source) {
            Intent intent = new Intent(SecondActivity.this, MainActivity.class);
            startActivity(intent);
        }
    });
}

public boolean onKeyDown(int keyCode, KeyEvent event) {
    if(keyCode== KeyEvent.KEYCODE_BACK){
        Intent intent = new Intent(SecondActivity.this, MainActivity.class);
        startActivity(intent);
    }
    return true;
}

@Override
protected BaseAdapter getAdapter() {
    Map<String, Object> profileMap;
    List<Map<String, Object>> profilesList = new ArrayList<>();

    int[] avatars = {
            R.drawable.hanfu_a,
            R.drawable.hanfu_b,
            R.drawable.hanfu_c,
            R.drawable.hanfu_d};
    String[] names = getResources().getStringArray(R.array.array_names);

    for (int i = 0; i < avatars.length; i++) {
        profileMap = new HashMap<>();
        profileMap.put(EuclidListAdapter.KEY_AVATAR, avatars[i]);
        profileMap.put(EuclidListAdapter.KEY_NAME, names[i]);
        profileMap.put(EuclidListAdapter.KEY_DESCRIPTION_SHORT, getString(R.string.lorem_ipsum_short));
        profileMap.put(EuclidListAdapter.KEY_DESCRIPTION_FULL, getString(R.string.lorem_ipsum_long));
        profilesList.add(profileMap);
    }

    return new EuclidListAdapter(this, R.layout.list_item, profilesList);
}

}
怎么把上面的代码写进public class StrangerFragment extends Fragment{

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_stranger, null);
    return view;
}

}里面

谢谢各位版主大神

布局写成一样，用 Button button=（Button）view.findViewById(R.id.back_button);获取控件
getActivity().onKeyDown()获取方法