如何使用 Android 导航抽屉更改片段 [英] How to change fragments using Android navigation drawer

问题描述

我知道这些类型的问题已经出现了，但我仍然没有找到这个问题的答案:

I know these types of question have already been here but still I have not found my answer for this question:

• 我创建了一个应用程序并使用了由应用程序 (AndroidStudio) 自动创建的导航抽屉

这是我所拥有的:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mNavigationDrawerFragment = (NavigationDrawerFragment)
            getFragmentManager().findFragmentById(R.id.navigation_drawer);
    mTitle = getTitle();

    // Set up the drawer.
    mNavigationDrawerFragment.setUp(
            R.id.navigation_drawer,
            (DrawerLayout) findViewById(R.id.drawer_layout));
}

@Override
public void onNavigationDrawerItemSelected(int position) {
    // update the main content by replacing fragments
    FragmentManager fragmentManager = getFragmentManager();
    fragmentManager.beginTransaction()
            .replace(R.id.container, PlaceholderFragment.newInstance(position + 1))
            .commit();
}

public void onSectionAttached(int number) {
    switch (number) {
        case 1:

            break;
        case 2:

            break;
        case 3:

            break;
    }
}

这里还有一些:

    public static PlaceholderFragment newInstance(int sectionNumber) {
        PlaceholderFragment fragment = new PlaceholderFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_SECTION_NUMBER, sectionNumber);
        fragment.setArguments(args);
        return fragment;
    }

    public PlaceholderFragment() {
    }

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

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        ((MainActivity) activity).onSectionAttached(
                getArguments().getInt(ARG_SECTION_NUMBER));
    }
}

我想使用导航抽屉中的按钮显示另一个片段.我想使用此代码，因此请不要向我发送任何制作自己的抽屉的指南或教程..

I want to display another fragment using the button in navigation drawer. I want to use this code so please do not send me any guides or tutorials making their own drawers..

问题是，我在case 1: case 2: 和 case 3: 中放什么，以防我想打开另一个分段?谢谢.

The question is, what do I put in case 1: case 2: and case 3: in case I want to open another fragment? Thanks.

还有一个问题:

• 如何添加更多片段和交易?这不起作用-

• How do I add more fragments and transactions? This doesn't work-

Fragment fragment = new MyFragment1();
Fragment frag = new MyFragment2();
FragmentManager fragmentManager = getFragmentManager();
switch(position) {
    case 0:
        fragment = new MyFragment1();
        break;
    case 1:
        frag = new MyFragment2();

        break;
}
fragmentManager.beginTransaction()
        .replace(R.id.container, fragment).commit();

推荐答案

你应该在 onNavigationDrawerItemSelected 方法中加入一个 switch 语句.

You should just put a switch statement into the onNavigationDrawerItemSelected method.

这样的事情应该可以工作:

Something like this should work:

public void onNavigationDrawerItemSelected(int position) {
    // update the main content by replacing fragments
    Fragment fragment;
    FragmentManager fragmentManager = getFragmentManager(); // For AppCompat use getSupportFragmentManager
    switch(position) {
        default:
        case 0:
            fragment = new MyFragment1();
            break;
        case 1:
            fragment = new MyFragment2();
            break;
    }
    fragmentManager.beginTransaction()
        .replace(R.id.container, fragment)
        .commit();
}

这只是很快完成，但我认为它应该起作用

This is just done quickly but I think it should work

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