IllegalArgumentException:找不到片段的id 0x7f07003c的视图

Question

我是Fragments的新手.我试过简单的片段示例.但它会引发错误.我不知道出了什么问题.

public class NewActivity extends Activity {
    int mStackLevel = 1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (savedInstanceState == null) {
            Fragment newFragment = NewFragment
                    .newInstance(mStackLevel);
            FragmentTransaction ft = getFragmentManager().beginTransaction();
            ft.add(R.id.simple_fragment, newFragment).commit();
        } else {
            mStackLevel = savedInstanceState.getInt("level");
        }
    }
    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("level", mStackLevel);
    }
    public static class NewFragment extends Fragment {
        int mNum;
        Context context;

        static NewFragment newInstance(int num) {
            NewFragment f = new NewFragment();

            // Supply num input as an argument.
            Bundle args = new Bundle();
            args.putInt("num", num);
            f.setArguments(args);

            return f;
        }

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            mNum = getArguments() != null ? getArguments().getInt("num") : 1;
            context = getActivity();
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View v = inflater.inflate(R.layout.example_fragment, container,
                    false);         
            return v;
        }
    }

}

我的logcat显示:

public class NewActivity extends Activity {
    int mStackLevel = 1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (savedInstanceState == null) {
            Fragment newFragment = NewFragment
                    .newInstance(mStackLevel);
            FragmentTransaction ft = getFragmentManager().beginTransaction();
            ft.add(R.id.simple_fragment, newFragment).commit();
        } else {
            mStackLevel = savedInstanceState.getInt("level");
        }
    }
    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("level", mStackLevel);
    }
    public static class NewFragment extends Fragment {
        int mNum;
        Context context;

        static NewFragment newInstance(int num) {
            NewFragment f = new NewFragment();

            // Supply num input as an argument.
            Bundle args = new Bundle();
            args.putInt("num", num);
            f.setArguments(args);

            return f;
        }

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            mNum = getArguments() != null ? getArguments().getInt("num") : 1;
            context = getActivity();
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View v = inflater.inflate(R.layout.example_fragment, container,
                    false);         
            return v;
        }
    }

}

任何帮助将受到高度赞赏.

谢谢.

Answer 1

ft.add(R.id.simple_fragment, newFragment).commit();

你错过setContentView了你的活动.如果没有View层次结构,则无法添加片段.

注意:您的片段由活动托管.因此,您需要先将内容设置为活动.