android AppWidgetProvider 定时刷新问题

原文地址:: http://blog.csdn.net/maydie1989/article/details/6460163

相关网帖

1.AppWidgetProvider使用问题----http://www.eoeandroid.com/thread-50955-1-1.html

2.关于 Android widget 配置文件里updatePeriodMillis的问题----http://blog.sina.com.cn/s/blog_7db89cd50100qu3m.html





AppWidgetProvider是专门用来***android桌面组件的东东

本来想做一个小时钟

但是在定时刷新的时候遇到了问题

很多资料和书上的方法是

在onUpdate()方法中

用Intent请求Service

Intent intent = new Intent(context, UpdateService.class);

context.startService(intent);

在service中的onStart()或者onReceive()方法中来实现更新界面

而在AndroidManifest.xml中定义一个receiver

<receiver

android:label="@string/app_name"

android:name=".DeskMain">

<intent-filter>

<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />

</intent-filter>

<meta-data android:name="android.appwidget.provider"

android:resource="@xml/my_widget_provider" >

</meta-data>

</receiver>

DeskMain是你的AppWidgetProvider类 @xml/my_widget_provider是提供UI信息的配置文件 比如宽高

android.appwidget.action.APPWIDGET_UPDATE 书上的解释是 当AppWidget更新时会收到的系统广播信息

但是用eclipse填写xml的时候这个选项已经没有了 于是上网查了一下

在 appwidget-provider 用 android:updatePeriodMillis 这种方式已经在SKD1.5以后被废了

解决的办法找了一下 大概总结了几种

1.在onUpdate()中用自己的Timer和TimerTask解决

http://www.eoeandroid.com/thread-50955-1-1.html

2.用Thread

3.Intent intent=new Intent(context ,WidgetService.class);

PendingIntent refreshIntent=PendingIntent.getService(context, 0, intent, 0);

AlarmManager alarm=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);

alarm.setRepeating(AlarmManager.RTC, 0, 1000, refreshIntent);//每秒1次

context.startService(intent);

service类↓

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public class WidgetService extends Service

{



@Override

public IBinder onBind(Intent intent)

{

return null;

}



@Override

public void onStart(Intent intent, int startId)

{

super.onStart(intent, startId);

RemoteViews rv = new RemoteViews(this.getPackageName(), R.layout.app);

rv.setTextViewText(R.id.av1, new Date().toLocaleString());

ComponentName cn = new ComponentName(this, DeskMain.class);

AppWidgetManager am = AppWidgetManager.getInstance(this);

am.updateAppWidget(cn, rv);

}

}

AppWidgetProvider类↓

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public class DeskMain extends AppWidgetProvider

{



@Override

public void onUpdate(Context context, AppWidgetManager appWidgetManager,

int[] appWidgetIds)

{

Log.i("syso", "update3...................");

Intent intent=new Intent(context ,WidgetService.class);

PendingIntent refreshIntent=PendingIntent.getService(context, 0, intent, 0);

AlarmManager alarm=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);

alarm.setRepeating(AlarmManager.RTC, 0, 1000, refreshIntent);

context.startService(intent);

}



@Override

public void onReceive(Context context, Intent intent)

{

Log.i("syso", "receive...................");

super.onReceive(context, intent);

}

AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.app"

android:versionCode="1"

android:versionName="1.0">

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>





<application android:icon="@drawable/icon" android:label="@string/app_name" android:screenOrientation="portrait" android:permission="android.permission.ACCESS_FINE_LOCATION">

<activity android:name=".Main"

android:label="@string/app_name">

<!-- -->

<receiver

android:label="@string/app_name"

android:name=".DeskMain">

<intent-filter>

<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />

</intent-filter>

<meta-data android:name="android.appwidget.provider"

android:resource="@xml/my_widget_provider" >

</meta-data>

</receiver>

<service android:name="WidgetService" />



</application>

<uses-sdk android:minSdkVersion="7" />



</manifest>

layout下的app.xml UI布局 xml下的my_widget_provider.xml 提供了UI宽高信息

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<?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="fill_parent" android:orientation="horizontal" android:gravity="center">

<ImageView android:src="@drawable/icon" android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/imageView1"></ImageView>



<TextView

android:gravity="center" android:text="TextView" android:id="@+id/av1" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>

</LinearLayout>



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<?xml version="1.0" encoding="utf-8"?>

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"

android:minWidth="95dip"

android:minHeight="73dip"

android:initialLayout="@layout/app"/>