上班天天打酱油，哎无事就学习了下android Widgets 桌面小布件，先看下文档

Dev Guide -》App Widgets

本人英文不好直接上代码了

先写个类继承AppWidgetProvider

package com.test.App_widget;import java.util.Calendar;import android.app.PendingIntent;import android.appwidget.AppWidgetManager;import android.appwidget.AppWidgetProvider;import android.content.Context;import android.content.Intent;import android.util.Log;import android.widget.RemoteViews;public class MyApp_widget extends AppWidgetProvider {private Context context;@Overridepublic void onUpdate( Context context,  AppWidgetManager appWidgetManager,int[] appWidgetIds) {updateAppWidget(context, appWidgetManager, appWidgetIds);context.startService(new Intent(context,MyServices.class));} static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,            int [] appWidgetIds) { Log.e("updateAppWidget", "updateAppWidget---------------------onStart");  int N = appWidgetIds.length; for (int i = 0; i < N; i++) { int appWidgetId = appWidgetIds[i];// Create an Intent to launch ExampleActivity//Intent intent = new Intent(context, MainActivity.class);//PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,//intent, 0);// Get the layout for the App Widget and attach an on-click listener// to the buttonRemoteViews views = new RemoteViews(context.getPackageName(),R.layout.main); Calendar calendar=Calendar.getInstance(); int hour=calendar.get(Calendar.HOUR); int minute=calendar.get(Calendar.MINUTE); int second=calendar.get(Calendar.SECOND); if(minute<10){ views.setTextViewText(R.id.textView1, ""+hour+":0"+minute+":"+second); }else if(second<10){ views.setTextViewText(R.id.textView1, ""+hour+":"+minute+":0"+second); }else if(minute<10&&second<10){ views.setTextViewText(R.id.textView1, ""+hour+":0"+minute+":"+second); } else{ views.setTextViewText(R.id.textView1, ""+hour+":"+minute+":"+second); }// views.setOnClickPendingIntent(R.id.button, pendingIntent);// Tell the AppWidgetManager to perform an update on the current App// WidgetappWidgetManager.updateAppWidget(appWidgetId, views);}    }}

当你在添加小部件时，他会自己调用onUpdate方法

然后是配置

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

其实这个类也是这个广播接收器，重要的是

<meta-data android:name="android.appwidget.provider" android:resource="@xml/appwidget_info" />

我们来看下这个文件

<?xml version="1.0" encoding="utf-8"?><appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"    android:minWidth="294dp"    android:minHeight="72dp"    android:updatePeriodMillis="86400000"    android:initialLayout="@layout/main"     ></appwidget-provider>

这些属性大家也知道是什么意思，一定是指定这个小部件的大小样式等

下面看下怎么更新这个小部件的样式，比如是个时钟第一秒是不是要刷新一次界面，这里我们写个services

package com.test.App_widget;import android.app.Service;import android.appwidget.AppWidgetManager;import android.content.ComponentName;import android.content.Intent;import android.os.Handler;import android.os.IBinder;import android.util.Log;public class MyServices extends Service{@Overridepublic IBinder onBind(Intent arg0) {return null;}@Overridepublic void onStart(final Intent intent, final int startId) {Log.e("MyServices", "MyServices---------------------onStart");super.onStart(intent, startId);AppWidgetManager appWidgetManager=AppWidgetManager.getInstance(this);int []appWidgetIds =appWidgetManager.getAppWidgetIds(new ComponentName(this, MyApp_widget.class));MyApp_widget.updateAppWidget(this, appWidgetManager, appWidgetIds);new Handler().postDelayed(new Runnable() {@Overridepublic void run() {onStart(intent, startId);}}, 1000);}}

这样就可以

android Widgets

Dev Guide -》App Widgets

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