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    ▪CheckedTextView 显示有关问题        CheckedTextView 显示问题 今天测试CheckedTextView竟然不显示  <CheckedTextView  android:id="@+id/ctv_checktext"  android:layout_width="fill_parent" android:paddingLeft="2px" android:paddingRight="2px" android:paddingTop="2px" andr.........

    ▪ TabActivity的应用        TabActivity的使用 TabActivity   首先Android里面有个名为TabActivity来给我们方便使用。其中有以下可以关注的函数：   public TabHost getTabHost ()  获得当前TabActivity的TabHost   public TabWidget getTabWidge.........

    ▪ AppWidgetProvider的承继       AppWidgetProvider的继承 public class WlanWidget extends AppWidgetProvider{ RemoteViews remoteViews; AppWidgetManager appWidgetManager; ComponentName thisWidget; WifiManager wifiManager; public void onUpdate(Context context, AppWidgetManage.........

  首先Android里面有个名为TabActivity来给我们方便使用。其中有以下可以关注的函数：

  public TabHost getTabHost ()  获得当前TabActivity的TabHost

  public TabWidget getTabWidget () 获得当前TabActivity 的TabWidget

 

  public void setDefaultTab (String tag) 这两个函数很易懂， 就是设置默认的Tab

  public void setDefaultTab (int index)  通过tab名——tag或者index(从0开始)

  

  protected void onRestoreInstanceState (Bundle state) 这 两个函数的介绍可以

  protected void onSaveInstanceState (Bundle outState) 参考 Activity的生命周期

 

TabHost

 

  从上面的函数可以知道如何添加tab了，要注意，这里的Tag(标签)，不是Tab按钮上的文字。

  而要设置tab的label和content，需要设置TabHost.TabSpec类。 引用SDK里面的话——“A tab has a tab indicator, content, and a tag that is used to keep track of it.”，TabHost.TabSpec就是管理这3个东西：

  public String getTag ()

  public TabHost.TabSpec setContent

  public TabHost.TabSpec setIndicator

 

  我理解这里的Indicator 就是Tab上的label，它可以

  设置label ： setIndicator (CharSequence label)

  或者同时设置label和icon ：setIndicator (CharSequence label, Drawable icon)

  或者直接指定某个view ： setIndicator (View view)

  

  对于Content ，就是Tab里面的内容，可以

  设置View的id ： setContent(int viewId)

  或者TabHost.TabContentFactory 的createTabContent(String tag)来处理：setContent(TabHost.TabContentFactory contentFactory)

  或者用new Intent 来引入其他Activity的内容：setContent(Intent intent)

主程序代码

package com.yang.tabletest;

import android.app.TabActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.widget.TabHost;

public class TableTestAcitivity extends TabActivity{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.main);
        
        //获得当前TabActivity的TabHost
       TabHost tabHost = getTabHost(); 
                 
               LayoutInflater.from(this).inflate(R.layout.tabs1, tabHost.getTabContentView(), true); 
        
               	tabHost.addTab(tabHost.newTabSpec("tab1") 
                         .setIndicator("主页")
                         .setContent(R.id.view1));
                         
               	
                 tabHost.addTab(tabHost.newTabSpec("tab2") 
                         .setIndicator("标题") 
                         .setContent(R.id.view2)); 
                 tabHost.addTab(tabHost.newTabSpec("tab3") 
                         .setIndicator("简介") 
                         .setContent(R.id.view3));
                 tabHost.addTab(tabHost.newTabSpec("tab4") 
                         .setIndicator("关于") 
                         .setContent(R.id.view4));
    }

	
}

 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent"> 
  
     <TextView android:id="@+id/view1" 
         android:background="@drawable/blue" 
         android:layout_width="fill_parent" 
         android:layout_height="fill_parent" 
         android:text="@string/tabs_1_tab_1"/> 
  
     <TextView android:id="@+id/view2" 
         android:background="@drawable/red" 
         android:layout_width="fill_parent" 
         android:layout_height="fill_parent" 
         android:text="@string/tabs_1_tab_2"/> 
  
     <TextView android:id="@+id/view3" 
         android:background="@drawable/green" 
         android:layout_width="fill_parent" 
         android:layout_height="fill_parent" 
         android:text="@string/tabs_1_tab_3"/> 
         
     <TextView android:id="@+id/view4" 
	      android:background="@drawable/green" 
	      android:layout_width="fill_parent" 
	      android:layout_height="fill_parent" 
	      android:text="@string/tabs_1_tab_4"/> 

 </FrameLayout> 

<?xml version="1.0" encoding="utf-8"?>
<resources>
	<string name="hello">Hello World, TableTestAcitivity!</string>
	<string name="app_name">阿福学习</string>
	<string name="tabs_1_tab_1">主页</string>
	<string name="tabs_1_tab_2">标题</string>
	<string name="tabs_1_tab_3">关于</string>
	<string name="tabs_1_tab_4">返回</string>
</resources>

 color.xml代码

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <drawable name="darkgray">#404040ff</drawable>
  
  <drawable name="red">#ff00ff</drawable>
  <drawable name="green">#0ff0ff</drawable>
  <drawable name="lightgray">#c0c0c0ff</drawable>
  
  <drawable name="yellow">#ffFF33ff</drawable>
  <drawable name="blue">#00ffff</drawable>
  <drawable name="gray">#808080ff</drawable>
  <drawable name="magenta">#ff6699ff</drawable>
  <drawable name="cyan">#66ffffff</drawable>
  <drawable name="black">#000000</drawable> 
  <drawable name="white">#FFFFFF</drawable> 
</resources>

  第二个例子的Activity代码

package com.yang.tabletest;

import android.app.TabActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TabHost;
import android.widget.TextView;

public class TableTestAcitivity extends TabActivity implements TabHost.TabContentFactory{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    	 super.onCreate(savedInstanceState); 
    	  
    	         final TabHost tabHost = getTabHost(); 
    	         tabHost.addTab(tabHost.newTabSpec("tab1") 
    	                 .setIndicator("主页", getResources().getDrawable(R.drawable.test)) 
    	                 .setContent(this)); 
    	         tabHost.addTab(tabHost.newTabSpec("tab2") 
    	                 .setIndicator("标题",getResources().getDrawable(R.drawable.test)) 
    	                 .setContent(this)); 
    	         tabHost.addTab(tabHost.newTabSpec("tab3") 
    	                 .setIndicator("关于",getResources().getDrawable(R.drawable.test)) 
    	                 .setContent(this)); 
         }

	@Override
	public View createTabContent(String arg0) {
		  final TextView tv = new TextView(this); 
		         tv.setText("Content for tab with tag " + arg0); 
		         
		         return tv;
	} 
    	  
    	  

	
}

 

public class WlanWidget extends AppWidgetProvider{ 
 
RemoteViews remoteViews; 
AppWidgetManager appWidgetManager; 
ComponentName thisWidget; 
WifiManager wifiManager; 
 
public void onUpdate(Context context, AppWidgetManager appWidgetManager, 
        int[] appWidgetIds) { 
        Timer timer = new Timer(); 
        timer.scheduleAtFixedRate(new WlanTimer(context, appWidgetManager), 1, 10000); 
 
} 
 
 
private class WlanTimer extends TimerTask{ 
 
        RemoteViews remoteViews; 
        AppWidgetManager appWidgetManager; 
        ComponentName thisWidget; 
 
 
public WlanTimer(Context context, AppWidgetManager appWidgetManager) { 
 
        this.appWidgetManager = appWidgetManager; 
        remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget); 
        thisWidget = new ComponentName(context, WlanWidget.class); 
        wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE); 
 
 
} 
 
@Override 
public void run() { 
 
        remoteViews.setTextViewText(R.id.widget_textview, 
        wifiManager.getConnectionInfo().getSSID()); 
        appWidgetManager.updateAppWidget(thisWidget, remoteViews); 
} 
 
}