在平板上经常能看到这种的情况：左边是一个列表，右边是列表项对应的内容，当点击某一个列表时，右边内容区也会随之改变。下面使用Fragment简单的demo：
思路：在MainActivity定义一个回调接口，并在列表点击回调该接口，然后在内容区的Fragment设置回调，同时改变Fragment的显示内容。具体代码如下：
主布局：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginLeft="16dp" android:layout_marginRight="16dp" android:divider="?android:attr/dividerVertical" android:showDividers="middle"> <ListView android:id="@+id/book_list" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1"/> <FrameLayout android:id="@+id/book_detail_container" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="3"/></LinearLayout>
ListView的item布局和内容区Fragment的布局都比较简单，分别是一个Textview和两个Textview布局，这里不再贴出。
MainActivity类（内容区的数据是写死的，仅仅做演示作用，一般来说需要从网络上获取数据）：
public class MainActivity extends Activity{ private OnChangeListener onchangedListener; List<Book> books; List<String> book_name = new ArrayList<>(); ListView listView; Adapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); books = new ArrayList<>(); initData(); for (int i = 0 ; i < books.size() ; i++) { book_name.add(books.get(i).getName()); } listView = (ListView) findViewById(R.id.book_list); adapter = new Adapter(book_name , this); listView.setAdapter(adapter); MyFragment fragment = new MyFragment(); FragmentManager fragmentManager = getFragmentManager(); FragmentTransaction transaction = fragmentManager.beginTransaction(); transaction.replace(R.id.book_detail_container , fragment); transaction.commit(); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { adapter.setSelectedPosition(position); adapter.notifyDataSetInvalidated(); if (onchangedListener != null) { onchangedListener.changeText(books.get(position)); } } }); } private void initData() { Book book1 = new Book(); book1.setId(1); book1.setName("疯狂Java讲义"); book1.setDesc("一本全面的，深入的Java学习图书，受到广大读者的热烈喜爱，已经被多家高校选为教材，成为国内一线的Java学习素材"); books.add(book1); Book book2 = new Book(); book2.setId(2); book2.setName("疯狂Android讲义"); book2.setDesc("Android学习者的首选教材，常年占据京东，当当，亚马逊3大网店Android销量排行榜首，是人人可必备的Android入门图书"); books.add(book2); Book book3 = new Book(); book3.setId(3); book3.setName("Java EE企业应用实战"); book3.setDesc("全面介绍Java EE开发的Struts2 ， Spring 3 ， Hibernate 4 架构，可以通过该书系统学习企业级开发，全面掌握Java学习"); books.add(book3); Book book4 = new Book(); book4.setId(4); book4.setName("HTML5开发"); book4.setDesc("全面介绍HTML5，CSS ，JavaScript等知识点，通过该书可以系统的学习Web前端开发，通常Javascript脚本设置动态页面"); books.add(book4); } public void setOnChangeListener(OnChangeListener onChangeListener) { this.onchangedListener = onChangeListener; } interface OnChangeListener { void changeText(Book book); }} 列表的Adapter类：
public class Adapter extends BaseAdapter{ private List<String> mData; private LayoutInflater layoutInflater; private int selectionPosition = -1; public Adapter(List<String> data , Context context) { this.mData = data; this.layoutInflater = LayoutInflater.from(context); } @Override public int getCount() { return mData.size(); } @Override public Object getItem(int position) { return mData.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup viewGroup) { ViewHolder viewHolder = null; if (convertView == null) { viewHolder = new ViewHolder(); convertView = layoutInflater.inflate(R.layout.item_layout , null); viewHolder.tv = (TextView) convertView.findViewById(R.id.item_text); convertView.setTag(viewHolder); } else { viewHolder = (ViewHolder) convertView.getTag(); } viewHolder.tv.setText(mData.get(position)); if (selectionPosition == position) { viewHolder.tv.setBackgroundColor(Color.YELLOW); } else { viewHolder.tv.setBackgroundColor(Color.WHITE); } return convertView; } public void setSelectedPosition(int position) { this.selectionPosition = position; } class ViewHolder { TextView tv; }} 内容区的Fragment类：
public class MyFragment extends Fragment{ MainActivity activity; private TextView title; private TextView desc; @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_book_detail , null); desc = (TextView) view.findViewById(R.id.book_desc); Log.d("fragment" , "Created"); activity = (MainActivity) getActivity(); activity.setOnChangeListener(new MainActivity.OnChangeListener() { @Override public void changeText(Book book) { title.setText(book.getName()); desc.setText(book.getDesc()); } }); return view; }} Book实体类：
public class Book{ private int id; private String name; private String desc; public Book() { } public Book(int id , String name , String desc) { this.id = id; this.name = name; this.desc = desc; } public void setName(String name) { this.name = name; } public void setId(int id) { this.id = id; } public void setDesc(String desc) { this.desc = desc; } public int getId() { return id; } public String getName() { return name; } public String getDesc() { return desc; }} 效果：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持VEVB武林网。
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