如何在仅适用于景观的应用程序的Android上的Corona SDK中检测方向变化？

Question

How to detect an orientation change in Corona SDK on Android for an Landscape Only app?

I note that the following do not work:

• using the orientation event won't work - this is noting an orientation event is not produced when switching between landscapeLeft to landscapeRight or vice-versa (ie portrait not supported in the app)

• using the "resize" event doesn't work - it only occurs for apps that support both portrait and landscape orientations

MAIN QUESTION THEREFORE: How to detect an orientation change in Corona SDK on Android for an Landscape Only app?

UPDATE: Actually some concerning is that I've just confirmed that on Android (on my new Nexus 7) that "system.orientation" is NOT changes when I tip the device upside down. That is it stay on "landscapeRight". So would this be a Corona bug? Only fix is going to be not allowing users to be able to tip/use the game upside down then no? (ie in landscapeLeft)

Answer 1

Corona won't distinguish between landscapeLeft and landscapeRight if your app only supports landscape mode. The Docs for Project Build Settings ( http://docs.coronalabs.com/guide/distribution/buildSettings/index.html ) state that:

4.In Android 2.2, if you build a landscape-only app by supporting landscapeRight and landscapeLeft, it will never display in the landscapeLeft mode. Likewise, if you build a portrait-only app by supporting portrait and portraitUpsideDown, it will never appear as portraitUpsideDown. This is an Android 2.2 limitation.

I've created a small project and can confirm that on my Nexus4 with Android 4.3, "orientation" event too doesn't get called (although it works in Simulator).

To answer your questions then: you can't detect orientation change for landscape only app. It doesn't seem to be Corona bug, rather Android limitation.

Answer 2

当前在Android设备上，仅在build.settings文件中启用自动旋转时才生成方向事件。