App Widget

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="wandroide.blogspot.com"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <receiver android:name=".MyAppWidget" 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/myappwidget_provider" />
    </receiver>
    </application>
    <uses-sdk android:minSdkVersion="7" />
</manifest> 

main.xml

<?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/widget_textview"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
</LinearLayout>

strings.xml

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

myappwidget_provider.xml

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:minWidth="146dip"
  android:minHeight="72dip"
  android:updatePeriodMillis="10000"
  android:initialLayout="@layout/main">
</appwidget-provider>

MyAppWidget.java

package wandroide.blogspot.com;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Timer;
import java.util.TimerTask;
import android.content.ComponentName;
import android.content.Context;
import android.appwidget.AppWidgetProvider;
import android.appwidget.AppWidgetManager;
import android.widget.RemoteViews;

public class MyAppWidget extends AppWidgetProvider 
{
//====顯示widget 
 @Override
 public void onUpdate(Context context, AppWidgetManager appWidgetManager,
                       int[] appWidgetIds) 
 {
     Timer timer = new Timer();
     timer.scheduleAtFixedRate(new MyTime(context, appWidgetManager), 1, 1000);
 }
 
 private class MyTime extends TimerTask 
 {
     RemoteViews remoteViews;
     AppWidgetManager appWidgetManager;
     ComponentName thisWidget;
     DateFormat format = SimpleDateFormat.getTimeInstance(SimpleDateFormat.MEDIUM,
                            Locale.getDefault());
     public MyTime(Context context, AppWidgetManager appWidgetManager) 
      {
         this.appWidgetManager = appWidgetManager;
         remoteViews = new RemoteViews(context.getPackageName(), R.layout.main);
         thisWidget = new ComponentName(context, MyAppWidget.class);
      }
     
     @Override
     public void run() 
      {
         remoteViews.setTextViewText(R.id.widget_textview,
                       "Time = " + format.format(new Date()));
         appWidgetManager.updateAppWidget(thisWidget, remoteViews);
      }
 }
}