如何在 Android Widget 上实现 Button [英] How to implement a Button on an Android Widget

问题描述

我刚刚开始进行 Android 开发，我已经创建了一个不错的小部件，可以在我的主屏幕上显示一些信息.但是，我现在想在我的小部件上实现一个 Button，以更新我的小部件 TextView 中的信息.

I am just getting started with Android development and I have created a nice little widget that displays some info on my home screen. However, I now want to implement a Button on my widget that updates the info in my widget TextView.

任何人都可以建议如何去做吗?

Can anyone advise how to go about doing this?

谢谢

推荐答案

已解决 - 如果您想创建 Button 来更新 Android AppWidget，我可以确认不需要 Activity.

Solved - I can confirm that an Activity is NOT needed if you want create a Button to update an Android AppWidget.

我已经能够实现我的 AppWidgetProvider 类，以便它在 AndroidManifest.xml 中向广播接收器注册一个 android.appwidget.action.APPWIDGET_UPDATE 意图过滤器，然后触发 AppWidgetProvider 类中的 onUpdate 事件(在然后运行 ​​UpdateService).

I have been able to implement my AppWidgetProvider class such that it registers an android.appwidget.action.APPWIDGET_UPDATE intent-filter with the Broadcast receiver in the AndroidManifest.xml, which then fires the onUpdate event in the AppWidgetProvider class (which in turn then runs the UpdateService).

<!-- Broadcast Receiver that will process AppWidget updates -->
<receiver android:name=".MyWidget" android:label="@string/widget_name">
   <intent-filter>
      <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
   </intent-filter>
   <meta-data android:name="android.appwidget.provider" android:resource="@xml/widget" />
</receiver>

我的 AppWidgetProvider 类中的 UpdateService 然后使用 onHandleIntent 运行私有 buildUpdate 方法 - 该方法通过调用 setOnClickPendingIntent 来注册 onClick 事件，如下所示:

The UpdateService in my AppWidgetProvider class then uses onHandleIntent to run a private buildUpdate method - which registers the onClick event with a call to setOnClickPendingIntent as follows:

// set intent and register onclick
Intent i = new Intent(this, MyWidget.class);
PendingIntent pi = PendingIntent.getBroadcast(context,0, i,0);
updateViews.setOnClickPendingIntent(R.id.update_button,pi);

这里是一个工作示例的一些源代码的链接，它显示了如何使用更新按钮来更新 Twitter 小部件:

Here is a link to some source code of a working example, which shows how an update button can be used to update a Twitter widget:

https://github.com/commonsguy/cw-advandroid/树/b01438e7f0fed8f795ddec4be43066905f03d0cc/AppWidget/TwitterWidget

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