Android Fragment的使用 八 ListFragment

ListFragment是封装了Fragment和ListView，方便Fragment快速形成ListView，和之前的DialogFragment一样，使得ListView变成Fragment有着自己生命周期，能在更多的情况下使用ListView，也使得Fragment能够做出列表这样常见的样式。
使用方法很简单，和ListView一样，上代码：

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }}activity_main<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal" >    <fragment        android:name="android.com.listfragment.ListFragmentImpl"        android:id="@+id/fragment1"        android:layout_weight="1"        android:layout_width="match_parent"        android:layout_height="match_parent" />    <fragment        android:name="android.com.listfragment.ListFragmentSelf"        android:id="@+id/fragment2"        android:layout_weight="1"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>public class ListFragmentImpl extends ListFragment{    private static final String TAG = "ListFragmentImpl";    private ListView selfList;    String[] cities = {            "Shenzhen",            "Beijing",            "Shanghai",            "Guangzhou",            "Wuhan",            "Tianjing",            "Changsha",            "Xi'an",            "Chongqing",            "Guilin",    };    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        Log.d(TAG, "onCreateView");        return inflater.inflate(R.layout.list_fragment_impl, container, false);    }    @Override    public void onCreate(Bundle savedInstanceState) {        Log.d(TAG, "onCreate");        super.onCreate(savedInstanceState);        // 设置ListFragment默认的ListView，即@id/android:list        this.setListAdapter(new ArrayAdapter<String>(getActivity(),                android.R.layout.simple_list_item_1, cities));    }    public void onListItemClick(ListView parent, View v,                                int position, long id) {        Log.d(TAG, "onListItemClick");        Toast.makeText(getActivity(),                "You have selected " + cities[position],                Toast.LENGTH_SHORT).show();    }}list_fragment_impl<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <!-- ListFragment对应的android:id值固定为"@id/android:list" -->    <ListView        android:id="@id/android:list"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:drawSelectorOnTop="false"        /></LinearLayout>public class ListFragmentSelf extends ListFragment{    private static final String TAG = "ListFragmentImpl";    private ListView selfList;    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        Log.d(TAG, "onCreateView");        return inflater.inflate(R.layout.list_fragment_self, container, false);    }    @Override    public void onCreate(Bundle savedInstanceState) {        final String[] from = new String[] {"title", "info"};        final int[] to = new int[] {R.id.text1, R.id.text2};        Log.d(TAG, "onCreate");        super.onCreate(savedInstanceState);        // 建立SimpleAdapter，将from和to对应起来        SimpleAdapter adapter = new SimpleAdapter(                this.getActivity(), getSimpleData(),                R.layout.two_textview, from, to);        this.setListAdapter(adapter);    }    public void onListItemClick(ListView parent, View v,                                int position, long id) {        Log.d(TAG, "onListItemClick");        Toast.makeText(getActivity(),                "You have selected " + position,                Toast.LENGTH_SHORT).show();    }    private List<Map<String, Object>> getSimpleData() {        List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();        Map<String, Object> map = new HashMap<String, Object>();        map.put("title", "Ferris wheel");        map.put("info", "Suzhou Ferris wheel");        list.add(map);        map = new HashMap<String, Object>();        map.put("title", "Flower");        map.put("info", "Roser");        list.add(map);        map = new HashMap<String, Object>();        map.put("title", "Disk");        map.put("info", "Song Disk");        list.add(map);        return list;    }}list_fragment_self<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <!-- ListFragment对应的android:id值固定为"@id/android:list" -->    <ListView        android:id="@id/android:list"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:drawSelectorOnTop="false"        /></LinearLayout>two_textview<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView android:id="@+id/text1"        android:textSize="12sp"        android:textStyle="bold"        android:layout_width="match_parent"        android:layout_height="wrap_content"/>    <TextView android:id="@+id/text2"        android:textSize="24sp"        android:layout_width="match_parent"        android:layout_height="wrap_content"/></LinearLayout>

下一次是一个综合的例子，说的是Fragment之间的数据传输。
再见