在屏幕的一部分上使用android.view.SurfaceView和摄像头 [英] Using android.view.SurfaceView with a camera on part of the screen
问题描述
我试图组装一个Android应用程序，将采取一个图片，并以某种方式处理它。我想要的布局类似于Google Goggles。
I trying to put together an Android app that will take a picture and process it in some way. I'd like the layout to be similar to Google Goggles. Meaning, camera preview on the top, and some controls on the bottom using portrait orientation.
我已经使用这里。这个工作，但我想在底部添加一个按钮。
I've built a first version using code sample from here. This works, but I want to add a button on the bottom.
我修改了我的main.xml看起来如下（基于这篇文章的评论）：
I've modified my main.xml to look as follows (based on comments from this post):
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<android.view.SurfaceView android:id="@+id/preview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentTop="true" />
<Button android:id="@+id/snap"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Snap"
android:layout_alignParentBottom="true" />
</RelativeLayout>
但是当我运行这个代码时，我得到以下异常：
But when I run this code I get the following exception:
E/AndroidRuntime( 199): Uncaught handler: thread main exiting due to uncaught exception
E/AndroidRuntime( 199): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.beerometer/com.beerometer.ImageCapture}: android.view.InflateException: Binary XML file line #6: Error inflating class Android.view.SurfaceView
E/AndroidRuntime( 199): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
E/AndroidRuntime( 199): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
E/AndroidRuntime( 199): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
E/AndroidRuntime( 199): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
E/AndroidRuntime( 199): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 199): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 199): at android.app.ActivityThread.main(ActivityThread.java:4363)
E/AndroidRuntime( 199): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 199): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 199): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
E/AndroidRuntime( 199): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
E/AndroidRuntime( 199): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 199): Caused by: android.view.InflateException: Binary XML file line #6: Error inflating class Android.view.SurfaceView
E/AndroidRuntime( 199): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:576)
E/AndroidRuntime( 199): at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
E/AndroidRuntime( 199): at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
E/AndroidRuntime( 199): at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
E/AndroidRuntime( 199): at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
E/AndroidRuntime( 199): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198)
E/AndroidRuntime( 199): at android.app.Activity.setContentView(Activity.java:1622)
E/AndroidRuntime( 199): at com.beerometer.ImageCapture.onCreate(ImageCapture.java:37)
E/AndroidRuntime( 199): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
E/AndroidRuntime( 199): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
E/AndroidRuntime( 199): ... 11 more
E/AndroidRuntime( 199): Caused by: java.lang.ClassNotFoundException: Android.view.SurfaceView in loader dalvik.system.PathClassLoader@44bfc7b0
E/AndroidRuntime( 199): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
E/AndroidRuntime( 199): at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
E/AndroidRuntime( 199): at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
E/AndroidRuntime( 199): at android.view.LayoutInflater.createView(LayoutInflater.java:466)
E/AndroidRuntime( 199): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:565)
E/AndroidRuntime( 199): ... 20 more
当我用别的东西替换SurfaceView
When I replace the SurfaceView above with something else, e.g. a TextView, that it displays, but in landscape.
如何使用纵向视图在屏幕的一部分上预览相机？
How can I get a camera preview on part of the screen using portrait view?
感谢
推荐答案
首先，你的布局可能不会给你想要的。考虑使用 RelativeLayout ，其中 Button 锚定到底部， code>固定在屏幕顶部和按钮的顶部。
First, your layout probably won't give you what you want. Consider using a RelativeLayout, with the Button anchored to the bottom, and the SurfaceView anchored to the top of the screen and the top of the Button.
在您的 SurfaceView xmlns：android =http://schemas.android.com/apk/res/android $ c>你不需要。你的根元素上的一个就足够了。
Also, you have a duplicate xmlns:android="http://schemas.android.com/apk/res/android" on your SurfaceView that you don't need. The one on your root element will suffice.
对于你的异常，你的堆栈跟踪中可能有更多的细节，你缺少，解释为什么 startPreview（）失败。在堆栈跟踪中间查找Caused by或其他行。如果你不能识别它，编辑你的问题，并粘贴在整个堆栈跟踪（和ping我通过评论这个答案，因为我不知道编辑否则）。
In terms of your exception, there may be more detail in your stack trace that you are missing, explaining why startPreview() failed. Look for a "Caused by" or other line mid-way through the stack trace. If you can't identify it, edit your question and paste in the entire stack trace (and ping me via a comment on this answer, since I won't know about the edit otherwise).
您还可以尝试本书示例作为另一个相机预览应用程序，看看是否有一些我如何解决问题，更好地为您的情况。
You might also experiment with this book example as another Camera preview app, to see if there's something about how I approach the problem that works better for your circumstance.
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