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Android高手進(jìn)階教程(八)之 ----Android Widget開(kāi)發(fā)案例
今天我們要寫一下Android Widget的開(kāi)發(fā),由于快點(diǎn)凌晨,我就不說(shuō)的太具體了,同志們就模仿吧!首先看一下效果圖:

  下面是Demo的詳細(xì)步驟:

  一、新建一個(gè)Android工程命名為:WidgetDemo.

  二、準(zhǔn)備素材,一個(gè)是Widget的圖標(biāo),一個(gè)是Widget的背景。存放目錄如下圖:

  三、修改string.xml文件如下:

<?xml version="1.0" encoding="utf-8"?>     
<resources>     
    <string name="hello">Hello World, WidetDemo!</string>     
    <string name="app_name">DaysToWorldCup</string>     
</resources>    
<?xml version="1.0" encoding="utf-8"?> 
<resources> 
    <string name="hello">Hello World, WidetDemo!</string> 
    <string name="app_name">DaysToWorldCup</string> 
</resources> 

  四、建立Widget內(nèi)容提供者文件,我們?cè)趓es下建立xml文件夾,并且新建一個(gè)widget_provider.xml代碼入下:

<?xml version="1.0" encoding="utf-8"?>     
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"    
    android:minWidth="50dip"    
    android:minHeight="50dip"    
    android:updatePeriodMillis="10000"    
    android:initialLayout="@layout/main"    
/>     
<?xml version="1.0" encoding="utf-8"?> 
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android" 
 android:minWidth="50dip" 
 android:minHeight="50dip" 
 android:updatePeriodMillis="10000" 
 android:initialLayout="@layout/main" 
/>    
五、修改main.xml布局,代碼如下:
<?xml version="1.0" encoding="utf-8"?>     
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    
    android:orientation="vertical"    
    android:layout_width="fill_parent"    
    android:layout_height="fill_parent"    
    android:background="@drawable/wordcup"    
    >     
<TextView       
    android:id="@+id/wordcup"    
    android:layout_width="fill_parent"      
    android:layout_height="wrap_content"      
    android:text="@string/hello"    
    android:textSize="12px"    
    android:textColor="#ff0000"    
    />     
</LinearLayout>    
<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="@drawable/wordcup" 
    >  
<TextView    
 android:id="@+id/wordcup" 
    android:layout_width="fill_parent"   
    android:layout_height="wrap_content"   
    android:text="@string/hello" 
  android:textSize="12px" 
    android:textColor="#ff0000" 
    />  
</LinearLayout> 
六、修改WidgetDemo.java代碼如下:  
package com.android.tutor;     
import java.util.Calendar;     
import java.util.Date;     
import java.util.GregorianCalendar;     
import java.util.Timer;     
import java.util.TimerTask;     
import android.appwidget.AppWidgetManager;     
import android.appwidget.AppWidgetProvider;     
import android.content.ComponentName;     
import android.content.Context;     
import android.widget.RemoteViews;     
public class WidetDemo extends AppWidgetProvider {     
    /** Called when the activity is first created. */    
       
    @Override    
    public void onUpdate(Context context, AppWidgetManager appWidgetManager,     
            int[] appWidgetIds) {     
             
        Timer timer = new Timer();     
        timer.scheduleAtFixedRate(new MyTime(context,appWidgetManager), 1, 60000);     
        super.onUpdate(context, appWidgetManager, appWidgetIds);     
    }     
         
         
    private class MyTime extends TimerTask{     
        RemoteViews remoteViews;     
        AppWidgetManager appWidgetManager;     
        ComponentName thisWidget;     
             
        public MyTime(Context context,AppWidgetManager appWidgetManager){     
            this.appWidgetManager = appWidgetManager;     
            remoteViews = new RemoteViews(context.getPackageName(),R.layout.main);     
                 
            thisWidget = new ComponentName(context,WidetDemo.class);     
        }     
        public void run() {     
                 
            Date date = new Date();     
            Calendar calendar = new GregorianCalendar(2010,06,11);     
            long days = (((calendar.getTimeInMillis()-date.getTime())/1000))/86400;     
            remoteViews.setTextViewText(R.id.wordcup, "距離南非世界杯還有" + days+"天");     
            appWidgetManager.updateAppWidget(thisWidget, remoteViews);     
                 
        }     
             
    }     
       
}    
package com.android.tutor;  
import java.util.Calendar;  
import java.util.Date;  
import java.util.GregorianCalendar;  
import java.util.Timer;  
import java.util.TimerTask;  
import android.appwidget.AppWidgetManager;  
import android.appwidget.AppWidgetProvider;  
import android.content.ComponentName;  
import android.content.Context;  
import android.widget.RemoteViews;  
public class WidetDemo extends AppWidgetProvider {  
    /** Called when the activity is first created. */ 
    
 @Override 
 public void onUpdate(Context context, AppWidgetManager appWidgetManager,  
   int[] appWidgetIds) {  
    
  Timer timer = new Timer();  
  timer.scheduleAtFixedRate(new MyTime(context,appWidgetManager), 1, 60000);  
  super.onUpdate(context, appWidgetManager, appWidgetIds);  
 }  
   
   
 private class MyTime extends TimerTask{  
  RemoteViews remoteViews;  
  AppWidgetManager appWidgetManager;  
  ComponentName thisWidget;  
    
  public MyTime(Context context,AppWidgetManager appWidgetManager){  
   this.appWidgetManager = appWidgetManager;  
   remoteViews = new RemoteViews(context.getPackageName(),R.layout.main);  
     
   thisWidget = new ComponentName(context,WidetDemo.class);  
  }  
  public void run() {  
     
   Date date = new Date();  
   Calendar calendar = new GregorianCalendar(2010,06,11);  
   long days = (((calendar.getTimeInMillis()-date.getTime())/1000))/86400;  
   remoteViews.setTextViewText(R.id.wordcup, "距離南非世界杯還有" + days+"天");  
   appWidgetManager.updateAppWidget(thisWidget, remoteViews);  
     
  }  
    
 }  
    
} 
 
七、修改配置文件AndroidManifest.xml,代碼如下:

<?xml version="1.0" encoding="utf-8"?>     
<manifest xmlns:android="http://schemas.android.com/apk/res/android"    
      package="com.android.tutor"    
      android:versionCode="1"    
      android:versionName="1.0">     
    <application android:icon="@drawable/icon" android:label="@string/app_name">     
        <receiver android:name=".WidetDemo"    
                  android:label="@string/app_name">     
            <intent-filter>     
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />     
            </intent-filter>     
            <meta-data android:name="android.appwidget.provider"    
                       android:resource="@xml/widget_provider"    
            />     
        </receiver>     
    </application>     
    <uses-sdk android:minSdkVersion="7" />     
</manifest>     
<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
      package="com.android.tutor" 
      android:versionCode="1" 
      android:versionName="1.0"> 
    <application android:icon="@drawable/icon" android:label="@string/app_name"> 
        <receiver android:name=".WidetDemo" 
                  android:label="@string/app_name"> 
            <intent-filter> 
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" /> 
            </intent-filter> 
            <meta-data android:name="android.appwidget.provider" 
                 android:resource="@xml/widget_provider" 
            /> 
        </receiver> 
    </application> 
    <uses-sdk android:minSdkVersion="7" /> 
</manifest>    

 

  八、點(diǎn)擊運(yùn)行(Ctrl+F11),之,運(yùn)行成功后,我們長(zhǎng)時(shí)間點(diǎn)擊桌面,會(huì)出現(xiàn)如下倆個(gè),依次點(diǎn)擊,就可以看到最上面的效果圖:

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