Android 桌面部件

桌面部件是一种利用AppWidget框架将应用程序的某个部件放在桌面。

?res/layout/digitalclock.xml

<?xml version="1.0" encoding="utf-8"?><TextView xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/time"    android:textSize="45px"    android:textStyle="bold"    android:textColor="#FFFFFFFF"    android:background="@drawable/bg"    android:layout_width="wrap_content"    android:layout_height="wrap_content" />

?res/xml/est_appwidget.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="1000"    android:initialLayout="@layout/digitalclock" />

?AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.studio.android.chp10.ex4"      android:versionCode="1"      android:versionName="1.0">    <application android:icon="@drawable/icon"                  android:label="@string/app_name">        <receiver android:name="ESTTime"                   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/est_appwidget" />        </receiver>        <service android:name=".ESTTime$UpdateService" />    </application>    <uses-sdk android:minSdkVersion="3" /></manifest> 

?

import android.app.Service;import android.appwidget.AppWidgetManager;import android.appwidget.AppWidgetProvider;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.os.IBinder;import android.text.format.Time;import android.widget.RemoteViews;public class ESTTime extends AppWidgetProvider {    @Override    public void onUpdate(Context context,             AppWidgetManager appWidgetManager,int[] appWidgetIds) {        context.startService(new Intent(context,UpdateService.class));    }    public static class UpdateService extends Service {        @Override        public void onStart(Intent intent, int startId) {            Time estTime = new Time("EST");            estTime.setToNow();            //传入所在包包名和布局文件            RemoteViews updateViews = new RemoteViews(getPackageName(),R.layout.digitalclock);            updateViews.setTextViewText(R.id.time,                    estTime.format("%H:%M"));                        ComponentName thisWidget =                 new ComponentName(this, ESTTime.class);            AppWidgetManager manager =                 AppWidgetManager.getInstance(this);            manager.updateAppWidget(thisWidget, updateViews);        }        @Override        public IBinder onBind(Intent intent) {            return null;        }    }}

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