如何在片段類中顯示listView？

Question

我是android編程的新手。 我想嘗試使用fragment制作簡單的選項卡布局應用程序，如何在片段中顯示 listView？ ，我用谷歌搜索並找到了一個解決方案，但它沒有使用片段類。 我可以顯示 webview 但如何顯示 listVIew

我的tab1類：

       public class Tab1 extends Fragment {
WebView webView;
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        // get the url to open
        // set up the WebView
        webView = (WebView) getView().findViewById(R.id.webView);
        webView.setWebViewClient(new MyBrowser());
        webView.getSettings().setLoadsImagesAutomatically(true);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
        webView.loadUrl("http://www.google.com");
    }
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v =inflater.inflate(R.layout.tab_1,container,false);
        return v;
    }
    private class MyBrowser extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }
    }
}

我的 tab2 類（我想在這里顯示 listView）：

    public class Tab2 extends Fragment {
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

The// ListView activity needs to extend activity class, it doesn't work in a fragment, how to display in a fragment?
    }
    
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.tab_2, container, false);
        return v;
    }

}

片段適配器：

公共類 ViewPagerAdapter 擴展 FragmentStatePagerAdapter {

 CharSequence Titles[]; // This will Store the Titles of the Tabs which are Going to be passed when ViewPagerAdapter is created int NumbOfTabs; // Store the number of tabs, this will also be passed when the ViewPagerAdapter is created // Build a Constructor and assign the passed Values to appropriate values in the class public ViewPagerAdapter(FragmentManager fm,CharSequence mTitles[], int mNumbOfTabsumb) { super(fm); this.Titles = mTitles; this.NumbOfTabs = mNumbOfTabsumb; } //This method return the fragment for the every position in the View Pager @Override public Fragment getItem(int position) { if(position == 0) // if the position is 0 we are returning the First tab { Tab1 tab1 = new Tab1(); return tab1; } else //if (position == 1) // As we are having 2 tabs if the position is now 0 it must be 1 so we are returning second tab { Tab2 tab2 = new Tab2(); return tab2; } // else // { // NewKasus newKasus = new NewKasus(); // return newKasus; // } } // This method return the titles for the Tabs in the Tab Strip @Override public CharSequence getPageTitle(int position) { return Titles[position]; } // This method return the Number of tabs for the tabs Strip @Override public int getCount() { return NumbOfTabs; } }

我的主要活動：

public class MainActivity extends ActionBarActivity {
//


    // Declaring Your View and Variables

    Toolbar toolbar;
    ViewPager pager;
    ViewPagerAdapter adapter;
    SlidingTabLayout tabs;
    CharSequence Titles[]={"Berita","Kasus","Add Kasus"};
    int Numboftabs =3;


    //
   // bawaaan materal tab
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        // Creating The Toolbar and setting it as the Toolbar for the activity

        toolbar = (Toolbar) findViewById(R.id.tool_bar);
        setSupportActionBar(toolbar);


        // Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs.
        adapter =  new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs);

        // Assigning ViewPager View and setting the adapter
        pager = (ViewPager) findViewById(R.id.pager);
        pager.setAdapter(adapter);

        // Assiging the Sliding Tab Layout View
        tabs = (SlidingTabLayout) findViewById(R.id.tabs);
        tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width

        // Setting Custom Color for the Scroll bar indicator of the Tab View
        tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
            @Override
            public int getIndicatorColor(int position) {
                return getResources().getColor(R.color.tabsScrollColor);
            }
        });

        // Setting the ViewPager For the SlidingTabsLayout
        tabs.setViewPager(pager);



    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Answer 1

在這里，我為您提供了在 Fragment 中顯示列表的簡單示例。

你的片段先...

public class Tab1 extends ListFragment { 
String[] list_items;    

Tab1(){
}

@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View rootView =inflater.inflate(R.layout.tab_1,container,false);
    list_items= getResources().getStringArray(R.array.list);
    setListAdapter(new ArrayAdapter(getActivity(),android.R.layout.simple_list_item_1,list_items);

 return rootView;
}
}

在你的 strings.xml 中

 <string-array name="list">
         <item>item1</item>
         <item>item1</item>
         <item>item1</item>
         <item>item1</item>
         <item>item1</item>
  </string-array>

你的 tab_1 布局必須有..listView。 id android:list僅當您使用ListFragment類擴展片段時才需要。 如果您只是使用Fragment進行擴展，則無需添加此特定 id android:list 。

對於這個例子，我給你在你的布局中需要遵循......

<ListView android:id="@id/android:list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#00FF00"
    android:layout_weight="1"
    />

這就是在片段中創建 listView 所需的全部內容。

在您的情況下，您獲取數組中的數據，然后將其傳遞到 listView。 在示例中，我在本地使用。 希望能幫助到你！

Answer 2

你的數據來源是什么？ 如果您使用的是普通字符串，則可以在onCreateView方法中執行此操作，就像在 Activity 中執行此操作的方式相同。

如果您從數據庫或網絡獲取數據，最好在 AsyncTask 的onPostExecute方法中進行