新浪微博布局学习——妙用TabHost

原始地址 http://www.cnblogs.com/over140/archive/2011/03/02/1968042.html

demo源码下载可参照 http://blog.csdn.net/michael__li/article/details/6945016

以下是转载

前言

  为了更好的开发Android应用程序,除了熟练掌握基本的UI组件和API外,还需要掌握一些技巧,而这些技巧可以通过阅读一些代码来提高,本系列将与大家分享一些新浪微博布局方面的收获,欢迎交流!

 

声明

  欢迎转载,但请保留文章原始出处:) 

    博客园:http://www.cnblogs.com

    农民伯伯: http://www.cnblogs.com/over140

 

版本

  新浪微博 weibo_10235010.apk

 

正文

  一、效果图

    新浪微博布局学习——妙用TabHost_第1张图片

    红色部分是本文要实现的目标。

 

  二、实现

    maintabs.xml

<? xml version="1.0" encoding="UTF-8" ?>
< TabHost  android:id ="@android:id/tabhost"  android:layout_width ="fill_parent"  android:layout_height ="fill_parent"
  xmlns:android
="http://schemas.android.com/apk/res/android" >
    
< LinearLayout  android:orientation ="vertical"  android:layout_width ="fill_parent"  android:layout_height ="fill_parent" >
        
< FrameLayout  android:id ="@android:id/tabcontent"  android:layout_width ="fill_parent"  android:layout_height ="0.0dip"  android:layout_weight ="1.0"   />
        
< TabWidget  android:id ="@android:id/tabs"  android:visibility ="gone"  android:layout_width ="fill_parent"  android:layout_height ="wrap_content"  android:layout_weight ="0.0"   />
        
< RadioGroup  android:gravity ="center_vertical"  android:layout_gravity ="bottom"  android:orientation ="horizontal"  android:id ="@id/main_radio"  android:background ="@drawable/maintab_toolbar_bg"  android:layout_width ="fill_parent"  android:layout_height ="wrap_content" >
            
< RadioButton    android:text ="@string/main_home"  android:checked ="true"  android:id ="@+id/radio_button0"  android:layout_marginTop ="2.0dip"  android:drawableTop ="@drawable/icon_1_n"  style ="@style/main_tab_bottom"   />
            
< RadioButton  android:id ="@+id/radio_button1"  android:layout_marginTop ="2.0dip"  android:text ="@string/main_news"  android:drawableTop ="@drawable/icon_2_n"  style ="@style/main_tab_bottom"   />
            
< RadioButton  android:id ="@+id/radio_button2"  android:layout_marginTop ="2.0dip"  android:text ="@string/main_my_info"  android:drawableTop ="@drawable/icon_3_n"  style ="@style/main_tab_bottom"   />
            
< RadioButton  android:id ="@+id/radio_button3"  android:layout_marginTop ="2.0dip"  android:text ="@string/menu_search"  android:drawableTop ="@drawable/icon_4_n"  style ="@style/main_tab_bottom"   />
            
< RadioButton  android:id ="@+id/radio_button4"  android:layout_marginTop ="2.0dip"  android:text ="@string/more"  android:drawableTop ="@drawable/icon_5_n"  style ="@style/main_tab_bottom"   />
        
</ RadioGroup >
    
</ LinearLayout >
</ TabHost >
复制代码

    styles.xml

     < style  name ="main_tab_bottom" >
        
< item  name ="android:textSize" > @dimen/bottom_tab_font_size </ item >
        
< item  name ="android:textColor" > #ffffffff </ item >
        
< item  name ="android:ellipsize" > marquee </ item >
        
< item  name ="android:gravity" > center_horizontal </ item >
        
< item  name ="android:background" > @drawable/home_btn_bg </ item >
        
< item  name ="android:paddingTop" > @dimen/bottom_tab_padding_up </ item >
        
< item  name ="android:layout_width" > fill_parent </ item >
        
< item  name ="android:layout_height" > wrap_content </ item >
        
< item  name ="android:button" > @null </ item >
        
< item  name ="android:singleLine" > true </ item >
        
< item  name ="android:drawablePadding" > @dimen/bottom_tab_padding_drawable </ item >
        
< item  name ="android:layout_weight" > 1.0 </ item >
    
</ style >
复制代码

     home_btn_bg.xml

         < selector
          
xmlns:android ="http://schemas.android.com/apk/res/android" >
            
< item  android:state_focused ="true"  android:state_enabled ="true"  android:state_pressed ="false"  android:drawable ="@drawable/home_btn_bg_s"   />
            
< item  android:state_enabled ="true"  android:state_pressed ="true"  android:drawable ="@drawable/home_btn_bg_s"   />
            
< item  android:state_enabled ="true"  android:state_checked ="true"  android:drawable ="@drawable/home_btn_bg_d"   />
            
< item  android:drawable ="@drawable/transparent"   />
        
</ selector >
复制代码

    代码说明:

        1.  需要注意的是他这里把TabWidget的Visibility设置成了gone!也就是默认难看的风格不见了:,取而代之的是5个带风格的单选按钮.

        2.  注意为单选按钮设置的style,其中最重要的是为其background设置了home_btn_bg.xml,也就是自定义了选中效果。

    Java文件

public   class  MainTabActivity  extends  TabActivity  implements
        OnCheckedChangeListener {

    
private  TabHost mHost;
    
private  Intent mMBlogIntent;
    
private  Intent mMoreIntent;
    
private  Intent mInfoIntent;
    
private  Intent mSearchIntent;
    
private  Intent mUserInfoIntent;

    @Override
    
protected   void  onCreate(Bundle savedInstanceState) {
        
super .onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.maintabs);

        
//  ~~~~~~~~~~~~ 初始化
         this .mMBlogIntent  =   new  Intent( this , HomeListActivity. class );
        
this .mSearchIntent  =   new  Intent( this , SearchSquareActivity. class );
        
this .mInfoIntent  =   new  Intent( this , MessageGroup. class );
        
this .mUserInfoIntent  =   new  Intent( this , MyInfoActivity. class );
        
this .mMoreIntent  =   new  Intent( this , MoreItemsActivity. class );

        initRadios();
        
        setupIntent();
    }

    
/**
     * 初始化底部按钮
     
*/
    
private   void  initRadios() {
         ((RadioButton) findViewById(R.id.radio_button0)).setOnCheckedChangeListener(
this );
         ((RadioButton) findViewById(R.id.radio_button1)).setOnCheckedChangeListener(
this );
         ((RadioButton) findViewById(R.id.radio_button2)).setOnCheckedChangeListener(
this );
         ((RadioButton) findViewById(R.id.radio_button3)).setOnCheckedChangeListener(
this );
         ((RadioButton) findViewById(R.id.radio_button4)).setOnCheckedChangeListener(
this );
    }

    
/**
     * 切换模块
     
*/
    @Override
    
public   void  onCheckedChanged(CompoundButton buttonView,  boolean  isChecked) {
        
if  (isChecked) {
            
switch  (buttonView.getId()) {
            
case  R.id.radio_button0:
                
this .mHost.setCurrentTabByTag( " mblog_tab " );
                
break ;
            
case  R.id.radio_button1:
                
this .mHost.setCurrentTabByTag( " message_tab " );
                
break ;
            
case  R.id.radio_button2:
                
this .mHost.setCurrentTabByTag( " userinfo_tab " );
                
break ;
            
case  R.id.radio_button3:
                
this .mHost.setCurrentTabByTag( " search_tab " );
                
break ;
            
case  R.id.radio_button4:
                
this .mHost.setCurrentTabByTag( " more_tab " );
                
break ;
            }
        }
    }

    
private   void  setupIntent() {
        
this .mHost  =  getTabHost();
        TabHost localTabHost 
=   this .mHost;

        localTabHost.addTab(buildTabSpec(
" mblog_tab " , R.string.main_home,
                R.drawable.icon_1_n, 
this .mMBlogIntent));

        localTabHost.addTab(buildTabSpec(
" message_tab " , R.string.main_news,
                R.drawable.icon_2_n, 
this .mInfoIntent));

        localTabHost.addTab(buildTabSpec(
" userinfo_tab " , R.string.main_my_info,
                R.drawable.icon_3_n, 
this .mUserInfoIntent));

        localTabHost.addTab(buildTabSpec(
" search_tab " , R.string.menu_search,
                R.drawable.icon_4_n, 
this .mSearchIntent));

        localTabHost.addTab(buildTabSpec(
" more_tab " , R.string.more,
                R.drawable.icon_5_n, 
this .mMoreIntent));

    }

    
private  TabHost.TabSpec buildTabSpec(String tag,  int  resLabel,  int  resIcon,
            
final  Intent content) {
        
return   this .mHost
                .newTabSpec(tag)
                .setIndicator(getString(resLabel),
                        getResources().getDrawable(resIcon))
                .setContent(content);
    }
复制代码

    代码说明

      1.  由于TabWidget被隐藏,所以相关的事件也会无效,这里取巧用RadioGroup与RadioButton的特性来处理切换,然后监听事件调用setCurrentTabByTag来切换Activity。

      2.  注意即使TabWidget被隐藏,也要为其设置indicator,否则会保持。

 

  三、总结

    在这之前如果要做这种效果我恐怕第一时间就会想到用ActivityGroup来做,主要是因为TabHost的TabWidget非常难看,用起来也不方便。其实从源码可以看出,TabActivity也是继承自ActivityGroup,这里结合了单选按钮和TabHost,各取其长,有时间可以专门写一个这样的自定义控件:)

 

  四、相关文章

    [Android]使用ActivityGroup来切换Activity和Layout

 

结束

   本文中使用的资源均反编译自apk文件,这里主要是讲思路,欢迎大家交流。

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