Question

android开发：这里为什么出错？ 点击按钮就出错了，

点击按钮就自动添加一个EditText的功能，但是为什么会出错？ 请高手看下，谢谢

public static class PlaceholderFragment extends Fragment {

private Button bt;
private LinearLayout li;
private int count=0;

public PlaceholderFragment() {

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);

bt=(Button) rootView.findViewById(R.id.bt);
li=(LinearLayout) rootView.findViewById(R.id.li);

bt.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
EditText editText=new EditText(getActivity());
editText.setHint("请输入第"+count+"个联系人信息！");
li.addView(editText);
getActivity().setContentView(li);

}
});

return rootView;
}

Answer 1

add可以，不要setContentView

Answer 2

getActivity().setContentView(li);这条语句去掉