【UVCcamera/新手向】Android Studio编译&踩的坑

•  说在前面

Android Studio版本：3.2

操作系统（AS）：Windows10

Android版本：5.0.2

摄像头：USB摄像头（640*480 贼辣鸡）

开源项目：saki4510t/UVCCamera

•  编译过程

1.  安装Android Studio

http://www.android-studio.org/

(貌似有的时候安装后不能再软件里下载SDK，不知道是为啥，而且Linux下好像没问题)

2.  下载源代码

https://github.com/saki4510t/UVCCamera

3.  打开项目

 4.  打开最外面的build.gradle文件

 注意这里的几个版本号：

supportLibVersion = '27.1.1' //大版本要和versionCompiler一致

commonLibVersion= '2.12.4' //暂时不管

versionBuildTool = '28.0.3' //选择SDK tools里面Android SDK build-tool 中已经安装的，如下图

versionCompiler = 27 //这两个貌似要大于26，选择如下图，没有的话安装一下（打勾->Apply）

versionTarget = 27

5.  Sync Project

 

 6.  安装NDK

这里不要使用SDK Manager进行安装，去官网下载NDK14

https://developer.android.google.cn/ndk/downloads/index.html

下载后解压到PATH/Android/Sdk目录下（可以改一下文件夹名）

 

7.  配置NDK

打开文件local.properties

 

File->Project Structure

8.  build 

9.  Run

 可能会出现以下错误：

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.serenegiant.usbcameratest0, PID: 12421
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.serenegiant.usbcameratest0/com.serenegiant.usbcameratest0.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
        at android.app.ActivityThread.access$800(ActivityThread.java:144)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5221)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
        at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:354)
        at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:323)
        at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284)
        at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
        at com.serenegiant.usbcameratest0.MainActivity.onCreate(MainActivity.java:61)
        at android.app.Activity.performCreate(Activity.java:5933)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) 
        at android.app.ActivityThread.access$800(ActivityThread.java:144) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:135) 
        at android.app.ActivityThread.main(ActivityThread.java:5221) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at java.lang.reflect.Method.invoke(Method.java:372) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 

需要将

改成  android:theme="@style/Theme.AppCompat.Light.NoActionBar"

 

• 其他错误 

E/UVCCamera: [30452*UVCCamera.cpp:172:connect]:could not open camera:err=-1

Process 'command '/root/Android/Sdk/ndk-bundle/ndk-build'' 
finished with non-zero exit value 2

上面这俩错误都需要将NDK版本改成14

• Test8截图

 

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