android wedgit

这两天要求做一个桌面小控件(wedgit)，控件上的内容是可变的(根据业务加载不同的图片)，所以要求能及时更新，由于sdk1.5以后取消了
android:updatePeriodMillis="1000"的自动更新，所以我就用了service结合定时器来实现，但是service是一直运行在后台，所以比较消耗资源；如有朋友知道较好的解决方法，请不吝赐教！谢！

我的实现如下：
在res文件夹下新建xml文件夹，里面加入wedgit.xml：
<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:minWidth="180dp"
  android:minHeight="150dp"
  android:updatePeriodMillis="1000"
  android:initialLayout="@layout/widget_first">
</appwidget-provider>

widget_first.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:layout_gravity="center"
  android:background="@drawable/alert_line">
  <LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:orientation="vertical"
    android:background="@drawable/bg">
    <LinearLayout
     android:layout_width="fill_parent"
     android:layout_height="40dp"
     android:gravity="center"
     android:background="@drawable/im_tab_bg">
      <TextView
      android:id="@+id/tv_widget_title"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:singleLine="true">
      </TextView>
    </LinearLayout>
    <!-- <View
      android:layout_width="fill_parent"
      android:layout_height="1dp"
      android:background="#99CCFF">
    </View> -->
    <LinearLayout
      android:id="@+id/ll_widget_middle_login"
      android:layout_width="fill_parent"
      android:layout_height="60dp"
      android:gravity="center"
      android:background="@drawable/im_tab_bg">
      <Button
        android:id="@+id/bt_widget_login"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:focusable="true"
        android:background="@drawable/btn_poiitem_selector"
        android:text="登陆">
      </Button>
    </LinearLayout>
    <LinearLayout
      android:id="@+id/ll_widget_middle_person"
      android:layout_width="fill_parent"
      android:layout_height="60dp"
      android:orientation="horizontal"
      android:background="@drawable/im_tab_bg">
      <ImageView
        android:id="@+id/iv_widget_header"
        android:layout_marginTop="2dp"
        android:layout_marginLeft="10dp"
        android:layout_width="50dp"
        android:layout_height="50dp">
      </ImageView>
      <TextView
        android:id="@+id/tv_widget_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp">
      </TextView>
    </LinearLayout>
    <!-- <View
      android:layout_width="fill_parent"
      android:layout_height="1dp"
      android:background="#0099FF">
    </View> -->
    <LinearLayout
      android:id="@+id/ll_widget_weather"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:orientation="horizontal">
      <ImageView
        android:id="@+id/iv_widget_weather_icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:src="@drawable/logo">
      </ImageView>
      <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="80dp"
        android:orientation="vertical">
        <TextView
          android:id="@+id/tv_widget_temperature"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content">
        </TextView>
        <TextView
          android:id="@+id/tv_widget_weather_content"
          android:layout_width="fill_parent"
          android:layout_height="wrap_content">
        </TextView>
      </LinearLayout>
    </LinearLayout>
   </LinearLayout>
</LinearLayout>
配置文件：
<service android:name=".app.widget.PETWidget$WidgetService"/>
<receiver android:name=".app.widget.PETWidget">
   <intent-filter>
     <action android:name="com.terry.action.widget.click"/>
     <action android:name="com.terry.action.widget.setting"/>
     <action android:name="com.terry.action.widget.weather"/>
     <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
   </intent-filter>
   <meta-data android:name="android.appwidget.provider"
              android:resource="@xml/wedgit"/>
</receiver>
由于AppWidgetProvider是继承了广播接收器组件，所以要配成<receiver>

package com.lolaage.app.widget;

import java.util.Timer;
import java.util.TimerTask;

import com.lolaage.R;
import com.lolaage.app.activity.LoginActivity;
import com.lolaage.app.activity.SystemInitActivity;
import com.lolaage.app.activity.widget.WidgetFirstActivity;
import com.lolaage.app.activity.widget.WidgetSettingActivity;
import com.lolaage.deamon.HandlerManager;
import com.lolaage.deamon.Memory;
import com.lolaage.tool.Constant;
import com.lolaage.tool.PoiUtil;

import android.app.PendingIntent;
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.Handler;
import android.os.IBinder;
import android.os.Message;
import android.view.View;
import android.widget.RemoteViews;

public class PETWidget extends AppWidgetProvider {

//widget单击动作
private static final String ACTION_CLICK = "com.terry.action.widget.click";
private static final String ACTION_SETTING = "com.terry.action.widget.setting";
private static final String ACTION_WEATHER = "com.terry.action.widget.weather";

private static RemoteViews rv;
private static ComponentName com;
private static AppWidgetManager app;
@Override
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
// Log.v("=====PETWidget=====", "onReceive");
Intent i ;
if(intent.getAction().equals(ACTION_CLICK)){

i = new Intent(context,LoginActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
}else if(intent.getAction().equals(ACTION_SETTING)){

i = new Intent(context,WidgetSettingActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
}else if(intent.getAction().equals(ACTION_WEATHER)){

i = new Intent(context,SystemInitActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Message msg = new Message();
msg.obj = Constant.ACTIVITY_ID_WEATHER;
msg.what = Constant.ACTIVITY_ID_WEATHER;
Handler handler = HandlerManager.getHandler(SystemInitActivity.class.getName());
handler.sendMessage(msg);
context.startActivity(i);
}

}
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
super.onUpdate(context, appWidgetManager, appWidgetIds);
context.startService(new Intent(context,WidgetService.class));
}
public static class WidgetService extends Service{

private Timer timer = new Timer();
private Handler handler = new Handler(){
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
updateWidget();
break;

default:
break;
}
};
};
@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);

timer.scheduleAtFixedRate(new TimerTask() {

@Override
public void run() {
Message msg = new Message();
msg.what = 1;
handler.sendMessage(msg);
}
},0,1000);
}
/**
* 更新
*/
private void updateWidget(){
rv = new RemoteViews(getPackageName(), R.layout.widget_first);
Intent intent;
PendingIntent pending;
if(Memory.isLogin){
rv.setViewVisibility(R.id.ll_widget_middle_login, View.GONE);
rv.setViewVisibility(R.id.ll_widget_middle_person, View.VISIBLE);
//初始化头像
if(!"".equals(PoiUtil.HEADERPATH)){
rv.setImageViewBitmap(R.id.iv_widget_header, PoiUtil.imageChange(PoiUtil.HEADERPATH));
}else{

rv.setImageViewResource(R.id.iv_widget_header,R.drawable.no_header2);
}
rv.setTextViewText(R.id.tv_widget_name,"姓名：\n"+Memory.mSelf.getNickName());

intent = new Intent(ACTION_SETTING);
pending = PendingIntent.getBroadcast(this, 0, intent, 0);
rv.setOnClickPendingIntent(R.id.ll_widget_middle_person, pending);
}else{
rv.setViewVisibility(R.id.ll_widget_middle_person, View.GONE);
rv.setViewVisibility(R.id.ll_widget_middle_login, View.VISIBLE);

intent = new Intent(ACTION_CLICK);
pending = PendingIntent.getBroadcast(this, 0, intent, 0);
rv.setOnClickPendingIntent(R.id.bt_widget_login, pending);
}
Intent intentWeather = new Intent(ACTION_WEATHER);
PendingIntent pendingW = PendingIntent.getBroadcast(this, 0, intentWeather, 0);
rv.setOnClickPendingIntent(R.id.ll_widget_weather, pendingW);

rv.setTextViewText(R.id.tv_widget_title, PoiUtil.WIDGET);
//获取组件的完整名字
com = new ComponentName(this, PETWidget.class);
//执行内容更新
app = AppWidgetManager.getInstance(this);
app.updateAppWidget(com, rv);
}
@Override
public void onDestroy() {
if(timer != null){
timer.cancel();
}
super.onDestroy();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}}
}