先简单介绍一下桌面插件的形成方式：

xml文件中各个属性网上有解释，可以查。

首先，在res文件中新建XML文件

<?xml version=
"1.0" encoding=
"utf-8"?>
<appwidget-provider
    xmlns:android=
"http://schemas.android.com/apk/res/android"    
    android:minWidth="100dp"
    android:minHeight="100dp"
    android:updatePeriodMillis = "10000"
    android:initialLayout = "@layout/appwidget"
        >
    
</appwidget-provider>
 

在原xml文件中布局

<?xml version=
"1.0" encoding=
"utf-8"?>
<LinearLayout
    xmlns:android=
"http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
        <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="第一个app_widget应用" android:textSize="30dp"></TextView>
</LinearLayout>
 

Androidmanifest.xml设置代码

<?xml version=
"1.0" encoding=
"utf-8"?>
<manifest xmlns:android=
"http://schemas.android.com/apk/res/android"
  package="com.AppWidgetDemo" android:versionCode="1"
  android:versionName="1.0">
  <uses-sdk android:minSdkVersion="7" />
  <application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".MainActivity" android:label="@string/app_name">
      <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
    </activity>
    <receiver android:name="AppWidgetDemo">
      <intent-filter>
        <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
      </intent-filter>
      <meta-data android:name="android.appwidget.provider"
        android:resource="@xml/app_widget" />
    </receiver>
  </application>
</manifest>
代码如下
package com.AppWidgetDemo;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
public
class AppWidgetDemo
extends AppWidgetProvider {
  @Override
  
public
void onDeleted(Context context,
int[] appWidgetIds) {
  System.out.println(
"onDeleted");
    
super.onDeleted(context, appWidgetIds);
    
  }
  @Override
  
public
void onDisabled(Context context) {
    System.out.println(
"onDisabled");
    
super.onDisabled(context);
  }
  @Override
  
public
void onEnabled(Context context) {
    System.out.println(
"onEnabled");
    
super.onEnabled(context);
  }
  @Override
  
public
void onReceive(Context context, Intent intent) {
    System.out.println(
"onReceive");
    
super.onReceive(context, intent);
  }
  @Override
  
public
void onUpdate(Context context, AppWidgetManager appWidgetManager,
      
int[] appWidgetIds) {
    System.out.println(
"onUpdate");
    
super.onUpdate(context, appWidgetManager, appWidgetIds);
    System.out.println(
"super下面的onUpdate");
  }
}
注意复写方法