在导航抽屉中管理片段 [英] Managing Fragments in a navigation drawer

问题描述

我从以下位置复制了一个导航抽屉 http://javatechig.com/android/navigation-drawer-android-example 但是我在管理片段或屏幕上的主要内容时遇到了麻烦.

I copied a navigation drawer from http://javatechig.com/android/navigation-drawer-android-example But I'm having trouble managing the fragments, or rather the main content on the screen.

@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mTitle = "Formulas";
    getActionBar().setTitle(mTitle);

    // Getting reference to the DrawerLayout
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

    mDrawerList = (ListView) findViewById(R.id.drawer_list);

    // Getting reference to the ActionBarDrawerToggle
    mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
            R.drawable.ic_drawer, R.string.drawer_open,
            R.string.drawer_close) {

        /** Called when drawer is closed */
        public void onDrawerClosed(View view) {
            getActionBar().setTitle(mTitle);
            invalidateOptionsMenu();

        }

        /** Called when a drawer is opened */
        public void onDrawerOpened(View drawerView) {
            getActionBar().setTitle("Formulas");
            invalidateOptionsMenu();
        }

    };

    // Setting DrawerToggle on DrawerLayout
    mDrawerLayout.setDrawerListener(mDrawerToggle);

    // Creating an ArrayAdapter to add items to the listview mDrawerList
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(getBaseContext(), 
            R.layout.drawer_list_item, getResources().getStringArray(R.array.menus));

    // Setting the adapter on mDrawerList
    mDrawerList.setAdapter(adapter);

    // Enabling Home button
    getActionBar().setHomeButtonEnabled(true);

    // Enabling Up navigation
    getActionBar().setDisplayHomeAsUpEnabled(true);

    // Setting item click listener for the listview mDrawerList
    mDrawerList.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

            // Getting an array of rivers
            String[] menuItems = getResources().getStringArray(R.array.menus);

            // Currently selected river
            mTitle = menuItems[position];

            // Creating a fragment object
            WebViewFragment rFragment = new WebViewFragment();

            // Passing selected item information to fragment
            Bundle data = new Bundle();
            data.putInt("position", position);
            data.putString("url", getUrl(position));
            rFragment.setArguments(data);



            // Getting reference to the FragmentManager
            FragmentManager fragmentManager = getFragmentManager();

            // Creating a fragment transaction
            FragmentTransaction ft = fragmentManager.beginTransaction();

            // Adding a fragment to the fragment transaction
            ft.replace(R.id.content_frame, rFragment);

            // Committing the transaction
            ft.commit();

            // Closing the drawer
            mDrawerLayout.closeDrawer(mDrawerList);

        }
    });
}




protected String getUrl(int position) {
    switch (position) {
    case 0:
        return "http://javatechig.com";
    case 1:
        return "http://javatechig.com/category/android/";
    case 2:
        return "http://javatechig.com/category/blackberry/";
    case 3:
        return "http://javatechig.com/category/j2me/";
    case 4:
        return "http://javatechig.com/category/sencha-touch/";
    case 5:
        return "http://javatechig.com/category/phonegap/";
    case 6:
        return "http://javatechig.com/category/java/";
    default:
        return "http://javatechig.com";
    }
}

如何管理片段，以便我可以: -在项目中输入基本的xml/java(这样我就不必打捆了) 或者 -替换当前片段，以便我可以自己创建并自定义所有内容

How do I manage the fragment so that I can: - Input either basic xml/java (so I don't have to bother about bundles) in the project or - replace the current fragment so that I can create my own and customize everything myself

推荐答案

我假设这是SDK附带的Android项目中的示例代码. 您的样本实际上包含交换活动"内容窗格中的片段所需的代码.

I assume this is the example code from the Android Project shipped with the SDK. Your sample actually contains the code needed for swapping the fragments in the content pane of the Activity.

    // Getting reference to the FragmentManager
    FragmentManager fragmentManager = getFragmentManager();

    // Creating a fragment transaction
    FragmentTransaction ft = fragmentManager.beginTransaction();

    // Adding a fragment to the fragment transaction
    ft.replace(R.id.content_frame, rFragment);

    // Committing the transaction
    ft.commit();

您的rFragment是将要加载的片段.您可以将整个部分放在一个方法中，并将片段作为该方法的参数传递，例如

Your rFragment is the fragment that is going to be loaded. You can put this whole section in a method and pass your fragment to be loaded as an argument of that method, e.g.

private void replaceFragment(Fragment newFragment) {
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction ft = fragmentManager.beginTransaction();
    ft.replace(R.id.content_frame, newFragment);
    ft.commit();
}

如果要加载的片段需要将数据传递给它，则可以使用捆绑包.您的片段可能会使用不同类型的数据，但是上面的代码仍然适用.在Fragment对象上调用setArguments()之后，调用它.

If your Fragment to be loaded needs data to be passed to it, you can use the Bundle. Your fragments might take different types of data, but the code above still applies. Call it after you have called setArguments() on your Fragment object.

这篇关于在导航抽屉中管理片段的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！