Android Widget 开发步骤 <1>-优快云博客

可以参考下面的demo:按照上面的步骤:

main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/wordcup"
        android:textSize="28px"
        android:textColor="#ff0000"
        android:text="@string/hello_world" />

</RelativeLayout>

在res下新建xml文件夹,然后仙剑widget文件:

注意下面android:initialLayout=""添加布局文件

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android" 
    android:minWidth="50dip"
    android:minHeight="50dip"
    android:updatePeriodMillis="1000"
    android:initialLayout="@layout/main">
    

</appwidget-provider>

然后实现继承AppWidgetProvider的类:

package wid;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Timer;
import java.util.TimerTask;

import com.example.androidwidgetdemos1.R;

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 widget extends AppWidgetProvider {

    @Override
    public void onDeleted(Context context, int[] appWidgetIds) {
        // TODO Auto-generated method stub
        super.onDeleted(context, appWidgetIds);
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        super.onReceive(context, intent);
    }

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager,
            int[] appWidgetIds) {
        // TODO Auto-generated method stub
        
        Timer timer=new Timer();
        timer.scheduleAtFixedRate(new MyTime(context,appWidgetManager), 1,60000);    
        
        super.onUpdate(context, appWidgetManager, appWidgetIds);
    }

    private class MyTime extends TimerTask{
        RemoteViews remoteViews;
        AppWidgetManager appWidgetManager;
        ComponentName thisWidget;
        
        public MyTime(Context context,AppWidgetManager appWidgetManager){
            
            this.appWidgetManager=appWidgetManager;
            remoteViews=new RemoteViews(context.getPackageName(),R.layout.main);
            thisWidget=new ComponentName(context,widget.class);
            
        }

        @Override
        public void run() {
            // TODO Auto-generated method stub
            
            Date date=new Date();
            Calendar calendar=new GregorianCalendar(2015,06,11);
            long days=(((calendar.getTimeInMillis()-date.getTime())/1000))/86400;
            
            remoteViews.setTextViewText(R.id.wordcup,"world cup space "+days+" day !");
            appWidgetManager.updateAppWidget(thisWidget, remoteViews);
            
        }
    }
    
    
}

AndroidManifest.xml

<receiver android:name="wid.widget"    
                  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/app_widget"    
            />     
        </receiver>