android实现widget时钟示例分享

一、在 AndroidManifest.xml文件中配置Widgets：

复制代码代码如下:

	
	<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>

二、在项目的res目录下建立xml目录，并且创建 timewidget_info.xml 文件，内容如下：

复制代码代码如下:

	
	<?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" />

三、在layout文件夹下建立文件time_appwidget.xml：

复制代码代码如下:

	
	<?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>

四、在drawable文件夹下建立rectangle.xml文件(这部可以省略，主要是为了美化TextView控件，渐变效果)：

复制代码代码如下:

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

<corners android:radius="9dp" />

五、后台代码实现：

复制代码代码如下:

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));
    }
}

复制代码代码如下:

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;
    }
}

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android实现widget时钟示例分享

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