如何在活动和小部件之间共享数据?

问题描述

我阅读了 hellowidget 教程和开发指南的 App Widgets.然后我知道如何创建一个包含按钮或文本或其他内容的小部件.

I read the hellowidget tutorial and Dev Guide' App Widgets. Then I know how to create a widget which contains button or text or something.

但我真正想做的是让它与我的应用交互.例如，我想创建一个具有文本视图的小部件，当我单击它时，它会向我的活动发送一个 PendingIntent，我可以在其中编辑文本.

But what I really want to do is making it interact with my app. For example, I want to create a widget that has a text view, and when I click it, it sends a PendingIntent to my activity in which I can edit the text.

我可以执行发送 PendingIntent"步骤.但是我在活动中编辑文本后，小部件如何读取它?

I can do the step "sends a PendingIntent". But after I edit text in acitivy, how does the widget read it?

推荐答案

你需要做的是注册一个自定义的intent，例如在你的AppWidgetProvider中注册一个ACTION_TEXT_CHANGED，例如:

What you need to do is register a custom intent, for example ACTION_TEXT_CHANGED in your AppWidgetProvider like this for example:

public static final String ACTION_TEXT_CHANGED = "yourpackage.TEXT_CHANGED";

在此之后，您需要在您的 AndroidManifest.xml 中注册您希望在接收者标签的意图过滤器部分接收此意图，如下所示:

After this, you need to register in your AndroidManifest.xml that you want to receive this intents in the intent-filter section of your receiver tag like this:

<receiver android:name=".DrinkWaterAppWidgetProvider">
    <intent-filter>
        <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
        <action android:name="yourpackage.TEXT_CHANGED" />                
    </intent-filter>
    <meta-data android:name="android.appwidget.provider"
        android:resource="@xml/appwidget_info" />
</receiver>

然后你必须在你的 AppWidgetProvider 中扩展 onReceive 方法，并确保你处理你的意图是这样的:

Then you have to extend the onReceive method in your AppWidgetProvider and make sure that you're handling your intent like this:

@Override
public void onReceive(Context context, Intent intent) {
    super.onReceive(context, intent);
    if (intent.getAction().equals(ACTION_TEXT_CHANGED)) {
        // handle intent here
        String s = intent.getStringExtra("NewString");
    }
}

以上所有设置完成后，您只需要在文本更改后在活动中广播意图，如下所示:

After all the above is set up, you just need to broadcast the intent in your activity after the text has changed like this:

Intent intent = new Intent(YourAppWidgetProvider.ACTION_TEXT_CHANGED);
intent.putExtra("NewString", textView.getText().toString());
getApplicationContext().sendBroadcast(intent);

其中NewString"应更改为您为字符串提供的名称.

Where "NewString" should be changed to the name you to give the the string.

希望对你有帮助.

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