ym——Android从零开始(20)(TabHost+ExpandableListView)(新)
转载请注明本文出自Cym的博客（http://blog.csdn.net/cym492224103），谢谢支持！
TabHost
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Activity
public 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：view
public 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。