检查小部件是否放置在 Android 屏幕上

问题描述

谁能告诉我如何检查我的小部件是否已放置在主屏幕上?

Can someone tell me how to check that my widget have been placed on the homescreen?

我的应用中有一些代码只有在小部件放在主屏幕上时才应该运行.

I have some code in my app that should run only if the widget is placed on the homescreen.

推荐答案

您需要自己存储这些信息.我通常使用应用程序首选项，但你可以使用任何东西.通常小部件使用服务进行通信，因此您的代码可能在服务中，但使用首选项允许您的应用程序的任何部分访问它.

You need to store that information yourself. I usually use the application preferences, but you could use anything. Generally widgets use services to communicate, so your code that does stuff is likely in a service, but using the preference allows any portion of your app to access this.

在扩展 AppWidgetProvider 的小部件类中，当小部件放在主屏幕上时会调用 onEnabled，而(通常)在移除时调用 onDeleted.onDisabled 在所有副本都被删除时调用.

In your widget class that extends AppWidgetProvider the onEnabled is called when the widget is put on a homescreen and the onDeleted is (usually) called when it's removed. onDisabled is called when all copies are removed.

所以在你的小部件提供者的代码中:

So in the code of your widget provider:

@Override
public void onEnabled(Context context) {
    super.onEnabled(context);
    setWidgetActive(true);
    context.startService(new Intent(appContext, WidgetUpdateService.class));
}

@Override
public void onDisabled(Context context) {
    Context appContext = context.getApplicationContext();
    setWidgetActive(false);
    context.stopService(new Intent(appContext, WidgetUpdateService.class));
    super.onDisabled(context);
}

private void setWidgetActive(boolean active){
    Context appContext = context.getApplicationContext();
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(appContext);
    SharedPreferences.Editor edit = prefs.edit();
    edit.putBoolean(Constants.WIDGET_ACTIVE, active);
    edit.commit();
}

在代码的其他地方，您可以通过以下方式检查小部件是否处于活动状态:

Elsewhere in code, you would check to see if the widget is active by:

public boolean isWidgetActive(Context context){
    Context appContext = context.getApplicationContext();
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
    return prefs.getBoolean(Constants.WIDGET_ACTIVE, false);
}

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