android创建一个时间widget

来源：互联网发布：u盘安装ubuntu工具包编辑：程序博客网时间：2024/06/05 22:44

1.AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.Demo2"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="21" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >               <receiver android:name="com.example.widgets.TimeWidgetProvider">           <intent-filter>               <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>           </intent-filter>           <meta-data android:name="android.appwidget.provider"               android:resource="@xml/appwidget_info"/>       </receiver>              <service android:name="com.example.widgets.TimeService"></service>    </application><uses-permission android:name="android.permission.CALL_PHONE"/></manifest>

2.在清单文件中声明了一个广播，现在建一个xml文件夹，创建appwidget_info.xml

</pre></p><p><pre name="code" class="java"><?xml version="1.0" encoding="utf-8"?><appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"   android:minWidth="294dp"   android:minHeight="72dp"   android:initialLayout="@layout/time_appwidget"   />

3.在appwidget_info.xml中初始化一个布局文件time_appwidget.xml

<?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="match_parent"        android:text="widget"        android:id="@+id/textView"        /></LinearLayout>

4.书写广播提供者TimeWidgetProvider.java

package com.example.widgets;import android.appwidget.AppWidgetManager;import android.appwidget.AppWidgetProvider;import android.content.Context;import android.content.Intent;public class TimeWidgetProvider extends AppWidgetProvider {@Overridepublic void onUpdate(Context context, AppWidgetManager appWidgetManager,int[] appWidgetIds) {}@Overridepublic void onDeleted(Context context, int[] appWidgetIds) {//当删除一个widget时，执行该方法}@Overridepublic void onEnabled(Context context) {context.startService(new Intent(context,TimeService.class));}@Overridepublic void onDisabled(Context context) {//当同类型的widget都删除后，执行该方法context.stopService(new Intent(context,TimeService.class));}}

5.书写广播服务可以动态改变时间TimeService.java

package com.example.widgets;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Timer;import java.util.TimerTask;import com.example.Demo2.R;import android.app.PendingIntent;import android.app.Service;import android.appwidget.AppWidgetManager;import android.content.ComponentName;import android.content.Intent;import android.net.Uri;import android.os.IBinder;import android.text.format.Time;import android.widget.RemoteViews;public class TimeService extends Service{private Timer timer;@Overridepublic void onCreate() {super.onCreate();timer = new Timer();timer.schedule(new TimeUpdateMask(), 0, 1000);}final class TimeUpdateMask extends TimerTask{@Overridepublic void run() {SimpleDateFormat sdf = new SimpleDateFormat("yy-MM-dd HH:mm:ss");String time = sdf.format(new Date());RemoteViews remoteView = new RemoteViews(getPackageName(), R.layout.time_appwidget);remoteView.setTextViewText(R.id.textView, time);PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 100, new Intent(Intent.ACTION_CALL,Uri.parse("tel:111111111")), 0);//为remoteview绑定服务remoteView.setOnClickPendingIntent(R.id.textView, pendingIntent );AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(getApplicationContext());appWidgetManager.updateAppWidget(new ComponentName(getApplicationContext(), TimeWidgetProvider.class), remoteView);}}@Overridepublic void onDestroy() {timer.cancel();timer = null;}@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn null;}}

0 0