appwidget实现textview显示时间

activity

package test.widget;

import android.app.Activity;
import android.os.Bundle;

public class Widget_demo_2Activity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.firstappwidget);
    }
}

fristappwidget.xml

<?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"
    android:orientation="vertical"
    >
   
    <TextView
        android:id="@+id/tv_msg"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:textSize="20sp"
        android:textColor="#ff0000"
        > 
         
 </TextView>
</LinearLayout>

Menifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="test.widget"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
 
        
        <receiver android:name=".MyAppWidgetProvider">
            <meta-data android:name="android.appwidget.provider"
              android:resource="@xml/appwidget_provider"/>
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
                </intent-filter>
                
        </receiver>
    </application>

</manifest>

manifest中定义的receiver:MyAppWidgetProvider.java

package test.widget;

import java.util.ArrayList;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.net.Uri;
import android.widget.RemoteViews;


public class MyAppWidgetProvider extends AppWidgetProvider{
 private static Timer mTimer;
 // mAppWidgetArray 保存窗口部件实例的数组
 private static ArrayList<int[]> mAppWidgetArray = new ArrayList<int[]>();
 
 private static RemoteViews mRemoteViews;
 
 
 // 当最后一个窗口部件实例被移除时调用
 public void onDisabled(Context context) {
  // TODO Auto-generated method stub
  super.onDisabled(context);

  stopTimerTask();
 }



 // 当第一个窗口部件实例被创建时调用
 public void onEnabled(Context context) {
  // TODO Auto-generated method stub
  super.onEnabled(context);

  startTimerTask(context);
 }


 
// @Override
// public void onUpdate(Context context, AppWidgetManager appWidgetManager,
//   int[] appWidgetIds) {
//  super.onUpdate(context, appWidgetManager, appWidgetIds);
//  int N = appWidgetIds.length;
//  System.out.println("MyAppWidgetProvider onUpdate : " + N);
//  for(int i = 0 ; i < N ; i++){
//   int appWidgetId = appWidgetIds[i];
//   System.out.println("appWidgetId : i = " + i + "appWidgetId = " + appWidgetId);
////   RemoteViews views = new RemoteViews(context.getPackageName(),R.layout.firstappwidget);
//   mRemoteViews = new RemoteViews(context.getPackageName(),R.layout.firstappwidget);
//   System.out.println("views : " + mRemoteViews);
//   java.text.DateFormat df = new java.text.SimpleDateFormat("hh:mm:ss");
//   String date = df.format(new Date());
//   System.out.println("date : " + date);
//   mRemoteViews.setTextViewText(R.id.tv_msg, "当前时间：" + date);
//   appWidgetManager.updateAppWidget(appWidgetId, mRemoteViews);
//   System.out.println("更新。。。");
//   updateAppWidget(context, appWidgetManager, appWidgetIds);
//   addInstance(appWidgetIds);
//  }
//  
// }
 
 // 窗口部件实例创建时调用
 public void onUpdate(Context context, AppWidgetManager appWidgetManager,
   int[] appWidgetIds) {
  // TODO Auto-generated method stub
  super.onUpdate(context, appWidgetManager, appWidgetIds);

  updateAppWidget(context, appWidgetManager, appWidgetIds);

  addInstance(appWidgetIds);
 }

 // 窗口部件实例删除时调用
 public void onDeleted(Context context, int[] appWidgetIds) {
  // TODO Auto-generated method stub
  super.onDeleted(context, appWidgetIds);

  removeInstance(appWidgetIds);
 }

 // 更新单个窗口部件实例
 public static void updateAppWidget(Context context,
   AppWidgetManager appWidgeManger, int []appWidgetIds) {

  mRemoteViews = new RemoteViews(context.getPackageName(), R.layout.firstappwidget);

  MyTimeAdapter timeAdapter = new MyTimeAdapter();
  String timeString = timeAdapter.formatTime();
//  String http = "http://192.168.170.34:7080/Analy/action/SynchroDataWeb!getLettersList.action?params={\"loginId\":\"test\"}";
//  mRemoteViews.setUri(R.id.webview, "getLettersList", Uri.parse(http));
  mRemoteViews.setTextViewText(R.id.tv_msg, timeString);
//  mRemoteViews.addView(viewId, nestedView)
//  mRemoteViews.setUri(viewId, methodName, value)

  appWidgeManger.updateAppWidget(appWidgetIds, mRemoteViews);

 }

 // 更新所有窗口部件实例
 public static void RefreshAllWidget(Context context){

  AppWidgetManager appWidgetManger = AppWidgetManager.getInstance(context);
  int instanceCount = mAppWidgetArray.size();

  for(int i = 0; i < instanceCount; i++){
   int[] appWidgetIds = mAppWidgetArray.get(i);
   updateAppWidget(context, appWidgetManger, appWidgetIds);
  }
 }

 // 增加窗口部件实例
 public static void addInstance(int[] appWidgetIds){
  if (mAppWidgetArray != null){
   mAppWidgetArray.add(appWidgetIds);
  }

 }

 // 删除窗口部件实例
 public static void removeInstance(int[] appWidgetIds){
  if (mAppWidgetArray != null){
   mAppWidgetArray.remove(appWidgetIds);
  }

 }

 // 开启刷新窗口部件的定时器
 public static void startTimerTask(final Context context){

  if (mTimer == null){
   mTimer = new Timer();

   TimerTask mTimerTask = new TimerTask() {

    @Override
    public void run() {
     // TODO Auto-generated method stub
     MyAppWidgetProvider.RefreshAllWidget(context);
    }
   };

   mTimer.schedule(mTimerTask, 0, 1000);
  }
 }

 // 关闭刷新窗口部件的定时器
 public static void stopTimerTask(){

  if (mTimer != null){
   mTimer.cancel();
   mTimer = null;
  }
 }

}

menifest中指定的resource:在res文件夹下新建xml文件夹，新建appwidget_provider.xml

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="200dp"
    android:minHeight="30dp"
    android:updatePeriodMillis="1000"
    android:initialLayout="@layout/firstappwidget"/>

说明：在如上xml中定义的android:updatePeriodMillis属性据说在android2.2以下版本才会生效，用来设置每隔多长时间刷新appwidget.
android2.2(包括)以上版本无效，所以在MyAppWidgetProvider中使用Timer、TimerTask来实现时间的刷新