ym——Android从零开始(20)(TabHost+ExpandableListView)(新)

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TabHost

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1通过布局显示内容：

Xml：

<?xml version="1.0"encoding="utf-8"?><TabHostxmlns:android="http://schemas.android.com/apk/res/android"   android:id="@+id/tabHost"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   >   <LinearLayout       android:layout_width="fill_parent"       android:layout_height="fill_parent"       androidrientation="vertical">             <TabWidget           android:id="@android:id/tabs"  android提供的规范必须有，相当于标识位           android:layout_width="fill_parent"           android:layout_height="wrap_content"/>               <FrameLayout           android:id="@android:id/tabcontent"   android提供的规范           android:layout_width="fill_parent"           android:layout_height="fill_parent">                      <LinearLayout                android:id="@+id/line1"               android:layout_width="fill_parent"               android:layout_height="fill_parent">                               <TextView                   android:layout_width="fill_parent"                    android:layout_height="wrap_content"                    android:text="one"/>           </LinearLayout>           <LinearLayout               android:id="@+id/line2"               android:layout_width="fill_parent"               android:layout_height="fill_parent">                               <TextView                   android:layout_width="fill_parent"                   android:layout_height="wrap_content"                    android:text="two"/>           </LinearLayout>           <LinearLayout                android:id="@+id/line3"               android:layout_width="fill_parent"               android:layout_height="fill_parent">                               <TextView                   android:layout_width="fill_parent"                    android:layout_height="wrap_content"                    android:text="three"/>           </LinearLayout>                  </FrameLayout>   </LinearLayout></TabHost>

Acivity

public class MainActivity extends Activity{         private TabHost mTabHost;       /**Called when the activity is first created. */   @Override   public void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.main);             mTabHost = (TabHost) findViewById(R.id.tabHost);       //初始化信息       mTabHost.setup();             //创建选项卡       TabSpec tab1 = mTabHost.newTabSpec("tab1");       //头信息       tab1.setIndicator("首页", getResources().getDrawable(R.drawable.i1));       //内容       tab1.setContent(R.id.line1);       mTabHost.addTab(tab1);             //创建选项卡       TabSpec tab2 = mTabHost.newTabSpec("tab2");       //头信息       tab2.setIndicator("第二页", getResources().getDrawable(R.drawable.i2));       //内容       tab2.setContent(R.id.line2);       mTabHost.addTab(tab2);             //创建选项卡       TabSpec tab3 = mTabHost.newTabSpec("tab3");       //头信息       tab3.setIndicator("第三页", getResources().getDrawable(R.drawable.i3));       //内容       tab3.setContent(R.id.line3);       mTabHost.addTab(tab3);    }}

2 通过Acivity显示内容

这样便于维护，适于做逻辑复杂的处理。

Xml

<?xml version="1.0"encoding="utf-8"?><TabHostxmlns:android="http://schemas.android.com/apk/res/android"   android:id="@+id/tabHost"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   >   <LinearLayout       android:layout_width="fill_parent"       android:layout_height="fill_parent"       androidrientation="vertical">             <TabWidget           android:id="@android:id/tabs"           android:layout_width="fill_parent"           android:layout_height="wrap_content"/>             <FrameLayout           android:id="@android:id/tabcontent"           android:layout_width="fill_parent"           android:layout_height="fill_parent"/>   </LinearLayout></TabHost>

Acivity

//ActivityGroup 能过管理多个Activitypublic class MainActivity2 extends ActivityGroup {         private TabHost mTabHost;       /**Called when the activity is first created. */   @Override    public void onCreate(BundlesavedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.main2);             mTabHost = (TabHost) findViewById(R.id.tabHost);       //初始化信息       mTabHost.setup(getLocalActivityManager());             //创建选项卡       TabSpec tab1 = mTabHost.newTabSpec("tab1");       //头信息       tab1.setIndicator("首页", getResources().getDrawable(R.drawable.i1));       //内容       tab1.setContent(newIntent(this,Activity1.class));    要求参数：Intent       mTabHost.addTab(tab1);             //创建选项卡       TabSpec tab2 = mTabHost.newTabSpec("tab2");       //头信息       tab2.setIndicator("第二页", getResources().getDrawable(R.drawable.i2));       //内容       tab2.setContent(new Intent(this,Activity2.class));       mTabHost.addTab(tab2);             //创建选项卡       TabSpec tab3 = mTabHost.newTabSpec("tab3");       //头信息       tab3.setIndicator("第三页", getResources().getDrawable(R.drawable.i3));       //内容       tab3.setContent(new Intent(this,Activity3.class));       mTabHost.addTab(tab3);    }}

3 自定义头部信息

头部xml

<?xml version="1.0"encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="match_parent"   android:layout_height="match_parent"   androidrientation="vertical"   android:background="@drawable/bg">   <TextView       android:id="@+id/tv_info"       android:layout_width="fill_parent"       android:layout_height="fill_parent"       android:gravity="center"       android:textColor="@android:color/white"       android:textSize="22sp"/></LinearLayout>

颜色选择器xml

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_selected="true"android:drawable="@drawable/bg_selected"/>    <item android:drawable="@drawable/bg_normal"></item></selector>

Acivity

tab3.setIndicator(createView("第一页")); 要求参数：viewpublic View createView(Stringtext){        LayoutInflatermInflater = getLayoutInflater();        Viewview = mInflater.inflate(R.layout.header, null);    TextView tv_info = (TextView)view.findViewById(R.id.tv_info);        tv_info.setText(text);        return view;    }

4 不需要布局文件

public class MyTabHostActivity extends TabActivity {             @Override       protectedvoid onCreate(Bundle savedInstanceState) {              // TODO Auto-generated method stub              super.onCreate(savedInstanceState);              不需要布局文件 只可以管理acitity内容              TabHost tabHost = getTabHost();                       }}

ExpandableListView

Xml:

<?xml version="1.0"encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   androidrientation="vertical" >   <ExpandableListView       android:id="@+id/elv"       android:layout_width="fill_parent"       android:layout_height="wrap_content"        /></LinearLayout>

Activity

public class MainActivity extends Activity{   /** Called when the activity is first created. */   @Override   public void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.main);             ExpandableListView elv = (ExpandableListView) findViewById(R.id.elv);             File file = new File(getFilesDir(),"commonnum.db");       ///data/data/包名/files       if(!file.exists()){        try {                            //复制数据库                            InputStreamis = getResources().getAssets().open("commonnum.db");               得到数据用流写入///data/data/包名/files便于读取                            byte[] buffer = new byte[1024];                            int len = 0;                            OutputStream os = newFileOutputStream(file);                            while((len = is.read(buffer)) != -1){                                   os.write(buffer,0, len);                            }                            is.close();                            os.close();                     }catch (Exception e) {                            // TODO Auto-generated catch block                            e.printStackTrace();                     }       }            List<Map<String,Object>> groupData= DataService.getGroupData(file.getAbsolutePath());      finalList<List<Map<String,Object>>> childData =DataService.getChildData(file.getAbsolutePath());             SimpleExpandableListAdapter adapter = newSimpleExpandableListAdapter(                this, 上下文                groupData, 父级数据                android.R.layout.simple_expandable_list_item_1,父级布局                new String[]{"name"},  父级属性                newint[]{android.R.id.text1}, 父级控件                childData, 子级数据                android.R.layout.simple_expandable_list_item_2,子级布局                newString[]{"name","number"}, 子级属性                newint[]{android.R.id.text1,android.R.id.text2}); 父级控件                elv.setAdapter(adapter);                     elv.setOnChildClickListener(newExpandableListView.OnChildClickListener() {                                          @Override                     publicboolean onChildClick(ExpandableListView parent, View v,                                   intgroupPosition, int childPosition, long id) {                            // TODO Auto-generated method stub                                                       //拿到电话号码                            String number =(String)childData.get(groupPosition).get(childPosition).get("number");                                                       //复制号码到拨号盘                            Intent intent = new Intent();                            intent.setAction(Intent.ACTION_DIAL);                            intent.setData(Uri.parse("tel:"+number));                            startActivity(intent);                            return false;                     }              });    }}

DataService

public class DataService {       /**        * 得到组数据        * @return        */       publicstatic List<Map<String,Object>> getGroupData(String path){                            List<Map<String,Object>> list= new ArrayList<Map<String,Object>>();打开数据库              SQLiteDatabase db=SQLiteDatabase.openDatabase(path,null, SQLiteDatabase.OPEN_READONLY);              if(db.isOpen()){                     Cursorc = db.query("classlist",                                   newString[]{"idx","name"},                                   null,null, null, null, null);                     while(c.moveToNext()){                            Map<String,Object> map = newHashMap<String, Object>();                            map.put("idx",c.getString(c.getColumnIndex("idx")));                            map.put("name",c.getString(c.getColumnIndex("name")));                            list.add(map);                     }                     c.close();                     db.close();              }              return list;       }                   /**        *得到子数据        * @param path        * @return        */       publicstatic List<List<Map<String,Object>>> getChildData(Stringpath){                            List<List<Map<String,Object>>>childData = new ArrayList<List<Map<String,Object>>>();                            SQLiteDatabase db =SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READONLY);              if(db.isOpen()){                                          //父数据的大小 根据父数据查询子节点数据                     List<Map<String,Object>>groupData = getGroupData(path);                     intsize = groupData.size();                     for(inti = 0;i < size;i++){                            List<Map<String,Object>> list= new ArrayList<Map<String,Object>>();                            Cursor c =db.query("table"+groupData.get(i).get("idx"),                                          newString[]{"name","number"},                                          null,                                          null, null, null, null);                            while(c.moveToNext()){                                   Map<String,Object>map = new HashMap<String, Object>();                                   map.put("name",c.getString(c.getColumnIndex("name")));                                   map.put("number",c.getString(c.getColumnIndex("number")));                                   list.add(map);                            }                            c.close();                                                       childData.add(list);                     }                     db.close();              }                            return childData;       }}

课后问题

TabHost使用在什么情况？  

一个界面显示种不类型的内容时使用。

实现TabHost的两种方式?

一种是自己写布局，一种是直接继承TabAcitity。 得到 TabHost对象

ExpandabledListView?

树形菜单。