Android Fragment實現(xiàn)列表和內(nèi)容聯(lián)動

更新時間：2019年01月05日 16:17:38 作者：Knick_Zhang

這篇文章主要為大家詳細介紹了Android Fragment實現(xiàn)列表和內(nèi)容聯(lián)動效果，具有一定的參考價值，感興趣的小伙伴們可以參考一下

在平板上經(jīng)常能看到這種的情況：左邊是一個列表，右邊是列表項對應的內(nèi)容，當點擊某一個列表時，右邊內(nèi)容區(qū)也會隨之改變。下面使用Fragment簡單的demo：

思路：在MainActivity定義一個回調(diào)接口，并在列表點擊回調(diào)該接口，然后在內(nèi)容區(qū)的Fragment設(shè)置回調(diào)，同時改變Fragment的顯示內(nèi)容。具體代碼如下：

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布局和內(nèi)容區(qū)Fragment的布局都比較簡單，分別是一個Textview和兩個Textview布局，這里不再貼出。

MainActivity類（內(nèi)容區(qū)的數(shù)據(jù)是寫死的，僅僅做演示作用，一般來說需要從網(wǎng)絡(luò)上獲取數(shù)據(jù)）：

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("瘋狂Java講義");
    book1.setDesc("一本全面的，深入的Java學習圖書，受到廣大讀者的熱烈喜愛，已經(jīng)被多家高校選為教材，成為國內(nèi)一線的Java學習素材");
    books.add(book1);

    Book book2 = new Book();
    book2.setId(2);
    book2.setName("瘋狂Android講義");
    book2.setDesc("Android學習者的首選教材，常年占據(jù)京東，當當，亞馬遜3大網(wǎng)店Android銷量排行榜首，是人人可必備的Android入門圖書");
    books.add(book2);

    Book book3 = new Book();
    book3.setId(3);
    book3.setName("Java EE企業(yè)應用實戰(zhàn)");
    book3.setDesc("全面介紹Java EE開發(fā)的Struts2 ， Spring 3 ， Hibernate 4 架構(gòu)，可以通過該書系統(tǒng)學習企業(yè)級開發(fā)，全面掌握Java學習");
    books.add(book3);

    Book book4 = new Book();
    book4.setId(4);
    book4.setName("HTML5開發(fā)");
    book4.setDesc("全面介紹HTML5，CSS ，JavaScript等知識點，通過該書可以系統(tǒng)的學習Web前端開發(fā)，通常Javascript腳本設(shè)置動態(tài)頁面");
    books.add(book4);
  }

  public void setOnChangeListener(OnChangeListener onChangeListener)
  {
    this.onchangedListener = onChangeListener;
  }

  interface OnChangeListener
  {
    void changeText(Book book);
  }
}

列表的Adapter類：

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;
  }
}

內(nèi)容區(qū)的Fragment類：

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);
    title = (TextView) view.findViewById(R.id.book_title);
    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實體類：

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：