MapFragment和照相机似乎在同一活动相互干涉 [英] MapFragment and Camera seem to interfere with each other in the same Activity

问题描述

我试图使用从谷歌地图的Andr​​oid API v2的一个MapFragment连同一个摄像头preVIEW。我需要能够在相机preVIEW和MapFragment之间切换，但我不能使它工作。

I'm trying to use a MapFragment from the Google Maps Android API v2 in conjunction with a Camera preview. I need to be able to switch between the camera preview and the MapFragment, but I can’t make it work.

有关相机preVIEW，我已经从的例如指南。当我想看看相机preVIEW，我使用添加摄像头preVIEW类的实例，以我的活动

For the Camera preview, I’ve copied the CameraPreview class from the example guide. When I want to see the Camera preview, I add an instance of the CameraPreview class to my activity using

CameraPreview mPreview = new CameraPreview(this); 
addContentView(mPreview, new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));

这时候我不使用时MapFragment正常工作。

This works fine when when I’m not using the MapFragment.

对于MapFragment，我通过

For the MapFragment, I’ve added it into my activity’s layout via

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >


    <fragment
        android:id="@+id/map"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.MapFragment" />

</LinearLayout> 

它工作正常，没有摄像头preVIEW。我可以隐藏和使用（例如，用于隐藏）取消隐藏MapFragment：

It works fine without the CameraPreview. I can hide and unhide the MapFragment using (e.g. for hide):

FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.hide(map_fragment);
ft.commit();

然而，问题是当我尝试使用两者结合起来，即隐藏MapFragment，然后添加一个摄像头preVIEW比如到我的活动。隐藏不起作用，而且似乎MapFragment莫名其妙劫持相机preVIEW并采取precedence。一个奇怪的特性是，如果我强迫屏幕睡觉，然后唤醒它，当它醒来相机preVIEW是存在的。如果我这样做，反过来，即先添加摄像头preVIEW然后隐藏MapFragment，行为是一样的。

However, the problem comes when I try and use the two together, i.e. hide the MapFragment and then add a CameraPreview instance into my activity. The hide doesn’t work, and it seems that the MapFragment somehow hijacks the CameraPreview and takes precedence. One strange feature is that if I force the screen to sleep and then wake it up, when it wakes up the CameraPreview is there. If I do it the other way round, i.e. add the CameraPreview first and then hide the MapFragment, the behavior is the same.

FYI：我上运行Android 4.1.1版本三星的Galaxy Note 2 LTE测试应用

FYI: I'm testing the app on a Samsung Galaxy Note 2 LTE running Android Version 4.1.1.

谁能告诉我什么，我做错了吗？

Can anyone tell me what I’m doing wrong?

推荐答案

使用setZOrderOnTop（布尔）在您的相机preVIEW像该M preview.setZOrderOnTop（真）;.
这对我的作品。

Use setZOrderOnTop(boolean) on your camerapreview like this mPreview.setZOrderOnTop(true);. It works for me.

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