android实现widget时钟示例分享

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.widget"
    android:versioncode="1"
    android:versionname="1.0" >
    <uses-sdk
        android:minsdkversion="8"
        android:targetsdkversion="17" />
    <application
        android:allowbackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/apptheme" >
        <receiver android:name=".timewidgetprovider" >
            <intent-filter>
                <action android:name="android.appwidget.action.appwidget_update" />
            </intent-filter>
            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/timewidget_info" />
        </receiver>
        <service android:name=".timerservice"></service>
    </application>
</manifest>

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:initiallayout="@layout/time_appwidget"
    android:minheight="40dp"
    android:minwidth="40dp"
    android:updateperiodmillis="0" />

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/rectangle"
    >
    <textview
         android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/textview"
        android:text="current time"
        />
</linearlayout>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <!-- 设置弧度 -->
    <corners android:radius="9dp" />

    <gradient
        android:angle="270"
        android:endcolor="#5eadf4"
        android:startcolor="#b3f0ff" />
    <padding
        android:bottom="5dp"
        android:left="5dp"
        android:right="5dp"
        android:top="5dp" />
    <stroke
        android:dashgap="1dp"
        android:dashwidth="10dp"
        android:width="6dp"
        android:color="#0000ff" />
</shape>

package com.example.widget;

import android.appwidget.appwidgetmanager;
import android.appwidget.appwidgetprovider;
import android.content.context;
import android.content.intent;

public class timewidgetprovider extends appwidgetprovider {
    @override
    public void onupdate(context context, appwidgetmanager appwidgetmanager,
            int[] appwidgetids) {
        super.onupdate(context, appwidgetmanager, appwidgetids);
    }
    //当一个widgets时会被调用
    public void ondeleted(context context, int[] appwidgetids) {
        // todo auto-generated method stub
        super.ondeleted(context, appwidgetids);
    }
    //第一次往桌面添加widgets时会被调用，之后添加同类型widgets不会被调用
    public void onenabled(context context) {
        context.startservice(new intent(context, timerservice.class));
    }
    //从桌面上删除最后一个widgets时会被调用
    public void ondisabled(context context) {
        context.stopservice(new intent(context, timerservice.class));
    }
}

package com.example.widget;

import java.text.simpledateformat;
import java.util.date;
import java.util.timer;
import java.util.timertask;

import android.annotation.suppresslint;
import android.app.service;
import android.appwidget.appwidgetmanager;
import android.content.componentname;
import android.content.intent;
import android.os.ibinder;
import android.widget.remoteviews;

public class timerservice extends service {
    private timer timer;

    @override
    public void oncreate() {   
        super.oncreate();
        timer = new timer();
        timer.schedule(new mytimertask(), 0, 1000);
    }
    private final class mytimertask extends timertask{
        @suppresslint("simpledateformat")
        @override
        public void run() {
            simpledateformat sdf= new simpledateformat("hh:mm:ss");
            string time = sdf.format(new date());
            //获取widgets管理器
              appwidgetmanager widgetmanager =appwidgetmanager.getinstance(getapplicationcontext());
            //widgetmanager所操作的widget对应的远程视图即当前widget的layout文件
              remoteviews remoteview = new remoteviews(getpackagename(), r.layout.time_appwidget);
            remoteview.settextviewtext(r.id.textview, time);
            //当点击widgets时触发的世界
            //remoteview.setonclickpendingintent(viewid, pendingintent)
            componentname componentname = new  componentname(getapplicationcontext(),timewidgetprovider.class);
            widgetmanager.updateappwidget(componentname, remoteview);
        }
    }
    @override
    public void ondestroy() {
        timer.cancel();
        timer=null;
        super.ondestroy();
    }
    @override
    public ibinder onbind(intent intent) {
        return null;
    }
}