Android Fragment实现列表和内容联动

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);

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。

以上是 Android Fragment实现列表和内容联动 的全部内容, 来源链接: utcz.com/p/241524.html

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