检查控件放置在Android屏幕 [英] Check Widget is Placed on Android Screen

问题描述

谁能告诉我如何检查我的小部件被放置在主屏幕上？

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

我有一些code。在我的应用程序，如果小部件被放置在主屏幕上应该只运行。

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

推荐答案

您需要自己存储的信息。我通常使用的应用程序preferences，但你可以使用任何东西。一般来说Widget使用服务进行通信，所以您的code，做的东西很可能在一个服务，但使用preference让您的应用程序的任何部分来访问这一点。

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onEnabled窗口小部件类被称为当小部件被放在一个主屏幕和onDeleted（通常）被称为时，它的去除。在删除所有副本onDisabled被调用。

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.

因此​​，在小部件提供商的code：

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();
}

在其他地方code，你会检查是否该控件是活动的：

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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