在平板上經(jīng)常能看到這種的情況:左邊是一個(gè)列表,右邊是列表項(xiàng)對(duì)應(yīng)的內(nèi)容,當(dāng)點(diǎn)擊某一個(gè)列表時(shí),右邊內(nèi)容區(qū)也會(huì)隨之改變。下面使用Fragment簡(jiǎn)單的demo:
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思路:在MainActivity定義一個(gè)回調(diào)接口,并在列表點(diǎn)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(shí)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(jiǎn)單,分別是一個(gè)Textview和兩個(gè)Textview布局,這里不再貼出。
MainActivity類(內(nèi)容區(qū)的數(shù)據(jù)是寫(xiě)死的,僅僅做演示作用,一般來(lái)說(shuō)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(xué)習(xí)圖書(shū),受到廣大讀者的熱烈喜愛(ài),已經(jīng)被多家高校選為教材,成為國(guó)內(nèi)一線的Java學(xué)習(xí)素材"); books.add(book1); Book book2 = new Book(); book2.setId(2); book2.setName("瘋狂Android講義"); book2.setDesc("Android學(xué)習(xí)者的首選教材,常年占據(jù)京東,當(dāng)當(dāng),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(shū)"); books.add(book2); Book book3 = new Book(); book3.setId(3); book3.setName("Java EE企業(yè)應(yīng)用實(shí)戰(zhàn)"); book3.setDesc("全面介紹Java EE開(kāi)發(fā)的Struts2 , Spring 3 , Hibernate 4 架構(gòu),可以通過(guò)該書(shū)系統(tǒng)學(xué)習(xí)企業(yè)級(jí)開(kāi)發(fā),全面掌握J(rèn)ava學(xué)習(xí)"); books.add(book3); Book book4 = new Book(); book4.setId(4); book4.setName("HTML5開(kāi)發(fā)"); book4.setDesc("全面介紹HTML5,CSS ,JavaScript等知識(shí)點(diǎn),通過(guò)該書(shū)可以系統(tǒng)的學(xué)習(xí)Web前端開(kāi)發(fā),通常Javascript腳本設(shè)置動(dòng)態(tài)頁(yè)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(shí)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:
以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持創(chuàng)新互聯(lián)。
名稱欄目:AndroidFragment實(shí)現(xiàn)列表和內(nèi)容聯(lián)動(dòng)
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