如何从非活动类启动活动? [英] How can I start an Activity from a non-Activity class?

问题描述

我有一个地图视图活动，其中显示了一些 OverlayItems.例如，在叠加层的 onTap 方法中，我想触发一个新活动，以全屏显示此叠加层照片.

I have a map view activity that shows a few OverlayItems. In the onTap method of an overlay, I want to trigger a new activity that shows this overlay photo as a fullscreen, for example.

当我在叠加类中执行此操作时:

When I do this inside my overlay class:

Intent intent = new Intent();
intent.setClass(getApplicationContext, FullscreenView.class);
startActivity(intent);

...它找不到应用程序上下文，因为我不在活动范围内.

.. it can't find an application context, as I am not in the scope of an activity.

当我向我的主要活动添加一个方法时，假设 startFullscreen:

When I add a method to my main activity, let's say startFullscreen:

public static void startFullscreen() {
    if (sCurrentPhoto != null) {
        Intent intent = new Intent();
        intent.setClass(getApplicationContext(), FullscreenView.class);
        startActivity(intent);          
    }
}

我无法调用 getApplicationContext() 和 startActivity()，因为我处于静态上下文中.但是，我需要静态方法在 Overlay 类中调用它，例如 MainView.startFullscreen().

I can not call getApplicationContext() and startActivity(), because I am in a static context. I need the static method however to call it in the Overlay class like MainView.startFullscreen().

简单地说:如何从非 Activity 类启动 Activity?

推荐答案

您的 onTap 覆盖接收 MapView，您可以从中获取 Context>:

Your onTap override receives the MapView from which you can obtain the Context:

@Override
public boolean onTap(GeoPoint p, MapView mapView)
{
    // ...

    Intent intent = new Intent();
    intent.setClass(mapView.getContext(), FullscreenView.class);
    startActivity(intent);

    // ...
}

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