Android桌面组件App Widget完整案例

<?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"> <TextView android:id="@+id/tv"  android:layout_width="fill_parent"  android:layout_height="wrap_content"   android:text="程序入口"   android:textSize="50dip"/></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android" android:minWidth="120dp"  android:minHeight="60dp" android:updatePeriodMillis="1000" android:initialLayout="@layout/main"></appwidget-provider>

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

package com.ljq.activity;public class UtilTool { public static boolean isChange=true;}

package com.ljq.activity;import android.app.PendingIntent;import android.appwidget.AppWidgetManager;import android.appwidget.AppWidgetProvider;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.widget.RemoteViews;public class TestActivity extends AppWidgetProvider { // 自定义一个Action名 private static final String ACTION_CLICK_NAME = "COM.LJQ.ACTION.WIDGET.CLICK"; private RemoteViews rv; @Override public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {  System.out.println("onUpdate");  //获取R.layout.main布局，通过类RemoteViews对布局R.layout.main里的控件进行操作  /*rv = new RemoteViews(context.getPackageName(), R.layout.main);  Intent intentClick = new Intent(ACTION_CLICK_NAME);  PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intentClick, 0);  rv.setOnClickPendingIntent(R.id.tv, pendingIntent);  ComponentName cmp = new ComponentName(context, TestActivity.class);  AppWidgetManager myAppWidgetManager = AppWidgetManager.getInstance(context);  myAppWidgetManager.updateAppWidget(cmp, rv);*/  final int N = appWidgetIds.length;  for (int i = 0; i < N; i++) {   int appWidgetId = appWidgetIds[i];   updateAppWidget(context, appWidgetManager, appWidgetId);  } } //AppWidget生命周期: 每接收一次，广播执行一次为一个生命周期结束。 //也就是说在重写AppWidgetProvider类里面声明全局变量做状态判断， //每次状态改变AppWidgetProvider再接收第二次广播时即为你重新初始化也就是说重新实例化了一次AppWidgetProvider。 //今天我因为在里面放了一个boolean值初始化为true，观察调试看到每次进入都为TRUE故你在设置桌面组件时， //全局变量把它声明在另外一个实体类用来判断是没问题的，切忌放在本类。 @Override public void onReceive(Context context, Intent intent) {  System.out.println("onReceive");  if (rv == null) {   rv = new RemoteViews(context.getPackageName(), R.layout.main);  }  if (intent.getAction().equals(ACTION_CLICK_NAME)) {   if (UtilTool.isChange) {    rv.setTextViewText(R.id.tv, "abc");   } else {    rv.setTextViewText(R.id.tv, "123");   }   UtilTool.isChange = !UtilTool.isChange;   AppWidgetManager appWidgetManger = AppWidgetManager.getInstance(context);   int[] appIds = appWidgetManger.getAppWidgetIds(new ComponentName(context, TestActivity.class));   appWidgetManger.updateAppWidget(appIds, rv);  }else{   super.onReceive(context, intent);  } } private void updateAppWidget(Context context,  AppWidgetManager appWidgeManger, int appWidgetId) {  rv = new RemoteViews(context.getPackageName(), R.layout.main);  Intent intentClick = new Intent();  intentClick.setAction(ACTION_CLICK_NAME);  PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intentClick, 0);  rv.setOnClickPendingIntent(R.id.tv, pendingIntent);  appWidgeManger.updateAppWidget(appWidgetId, rv); }}