Android Widget的写法

来源：互联网发布：手机拍视频软件编辑：程序博客网时间：2024/05/22 10:53

Xml example_appwidget_info.xml

<?xml version="1.0" encoding="utf-8"?><appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"    android:initialLayout="@layout/process_widget"    android:minHeight="72.0dip"    android:minWidth="294.0dip"    android:updatePeriodMillis="0" />

界面：process_widget.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:src="@drawable/widget_bg_portrait"    android:gravity="center_vertical" >    <LinearLayout        android:layout_width="0.0dip"        android:layout_height="fill_parent"        android:layout_marginLeft="5.0dip"        android:layout_weight="1.0"        android:background="@drawable/widget_bg_portrait_child"        android:gravity="center_vertical"        android:orientation="vertical"        android:paddingBottom="3.0dip"        android:paddingTop="3.0dip" >        <TextView            android:id="@+id/process_count"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginLeft="10.0dip"            />        <ImageView            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_marginBottom="1.0dip"            android:layout_marginTop="1.0dip"            android:background="@drawable/widget_bg_portrait_child_divider" />        <TextView            android:id="@+id/process_memory"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginLeft="10.0dip"          />    </LinearLayout>    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:gravity="center_horizontal"        android:orientation="vertical" >        <LinearLayout            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:gravity="center_vertical" >            <ImageView                android:layout_width="20.0dip"                android:layout_height="20.0dip"                android:background="@drawable/notification" />            <TextView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="@string/app_name"                />        </LinearLayout>        <Button            android:id="@+id/btn_clear"            android:layout_width="90.0dip"            android:layout_height="wrap_content"            android:layout_centerVertical="true"            android:layout_marginTop="5.0dip"            android:background="@drawable/button_background_selected"            android:text="一键清理"            />    </LinearLayout></LinearLayout>

Service 自己在清单文件中配置信息

package cn.itcast.mobilesafe.receiver.service;import java.util.Timer;import java.util.TimerTask;import android.app.PendingIntent;import android.app.Service;import android.appwidget.AppWidgetManager;import android.content.ComponentName;import android.content.Intent;import android.graphics.Color;import android.os.IBinder;import android.widget.RemoteViews;import cn.itcast.mobilesafe.R;import cn.itcast.mobilesafe.receiver.LockScreenReceiver;import cn.itcast.mobilesafe.util.TaskUtil;public class UpdateWidgetService extends Service {private Timer timer;private TimerTask task;private AppWidgetManager widgetmanager;@Overridepublic IBinder onBind(Intent arg0) {// TODO Auto-generated method stubreturn null;}@Overridepublic void onCreate() {timer = new Timer();widgetmanager = AppWidgetManager.getInstance(getApplicationContext());task = new TimerTask() {@Overridepublic void run() {//更新widget界面ComponentName componentname = new ComponentName("cn.itcast.mobilesafe","cn.itcast.mobilesafe.provider.ProcessWidget");RemoteViews views =  new RemoteViews("cn.itcast.mobilesafe",R.layout.process_widget);views.setTextViewText(R.id.process_count,"进程数目"+TaskUtil.getProcessCount(getApplicationContext()));views.setTextViewText(R.id.process_memory,"可用内存"+TaskUtil.getMemeorySize(getApplicationContext()));views.setTextColor(R.id.process_count,Color.RED);views.setTextColor(R.id.process_memory,Color.BLUE);Intent intent = new Intent(UpdateWidgetService.this,LockScreenReceiver.class);PendingIntent pendingintent = PendingIntent.getBroadcast(getApplicationContext(),0, intent,0);views.setOnClickPendingIntent(R.id.btn_clear, pendingintent);widgetmanager.updateAppWidget(componentname, views);}};//延迟1秒钟执行 每隔2000刷新一次timer.scheduleAtFixedRate(task, 1000,2000);super.onCreate();}@Overridepublic void onDestroy() {timer.cancel();timer = null;task = null;super.onDestroy();}}

provider ProcessWidget

package cn.itcast.mobilesafe.provider;import cn.itcast.mobilesafe.receiver.service.UpdateWidgetService;import android.appwidget.AppWidgetProvider;import android.content.Context;import android.content.Intent;public class ProcessWidget extends AppWidgetProvider{Intent intent;@Overridepublic void onDeleted(Context context, int[] appWidgetIds) {// TODO Auto-generated method stubsuper.onDeleted(context, appWidgetIds);context.stopService(intent);}@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubsuper.onReceive(context, intent);}@Overridepublic void onEnabled(Context context) {// TODO Auto-generated method stubsuper.onEnabled(context);intent = new Intent(context,UpdateWidgetService.class);context.startService(intent);//开启服务}}

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