引言 {#引言}

最近项目中要使用到USB摄像头的功能，然后就找到了UVCCamera这个开源项目，clone下来后，编译运行要报错，下面带你一步步解决错误，成功运行项目。

第一个错误： {#第一个错误：}

|-----------|---------------------------------------------------------| | 1 | Could not resolve com.serenegiant:common:2.12.4 |

解决方法：
打开project的build.gradle，替换掉原来的maven url，如下：

|------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 7 8 9 10 | allprojects { repositories { // google() maven { url 'https://maven.google.com' } jcenter() //maven { url 'http://raw.github.com/saki4510t/libcommon/master/repository/' } //使用下面的maven url即可 maven { url 'https://gitee.com/liuchaoya/libcommon/raw/master/repository/' } } } |

第二个错误： {#第二个错误：}

|---------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 | CreateProcess error=2, 系统找不到指定的文件。 Execution failed for task ':libuvccamera:ndkBuild'. A problem occurred starting process 'command 'null/ndk-build.cmd'' |

解决方法：
打开设置，确保如图已下载NDK，没有下载的就选一个下载，然后点击如下图标，打开设置，设置好NDK的位置即可。

太新的版本可能会报错，建议适当降低NDK版本，我这边使用的是：ndk\21.4.7075529

第三个错误： {#第三个错误：}

|-------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 | Execution failed for task ':libuvccamera:ndkBuild'. Process 'command 'G:\win7\developSoftware\androidSDK\ndk\21.0.6113669/ndk-build.cmd'' finished with non-zero exit value 2 |

解决方法：

打开Application.mk，修改APP_ABI，
修改前 APP_ABI := armeabi armeabi-v7a x86 mips
修改后 APP_ABI := armeabi-v7a x86

第四个错误： {#第四个错误：}

|---------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 | 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.usbcameratest.MainActivity.onCreate(MainActivity.java:61) |

解决方法：

打开AndroidManifest.xml，修改application的theme：
修改前 android:theme="@style/AppTheme"
修改后 android:theme="@style/Theme.AppCompat"

第五个错误： {#第五个错误：}

|---------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | Caused by: android.view.InflateException: Binary XML file line #32 in com.serenegiant.usbcameratest:layout/activity_main: Binary XML file line #32 in com.serenegiant.usbcameratest:layout/activity_main: Error inflating class com.serenegiant.widget.SimpleUVCCameraTextureView Caused by: android.view.InflateException: Binary XML file line #32 in com.serenegiant.usbcameratest:layout/activity_main: Error inflating class com.serenegiant.widget.SimpleUVCCameraTextureView Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Constructor.newInstance0(Native Method) at java.lang.reflect.Constructor.newInstance(Constructor.java:343) at android.view.LayoutInflater.createView(LayoutInflater.java:858) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1010) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:965) at android.view.LayoutInflater.rInflate(LayoutInflater.java:1127) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1088) at android.view.LayoutInflater.inflate(LayoutInflater.java:686) at android.view.LayoutInflater.inflate(LayoutInflater.java:538) at android.view.LayoutInflater.inflate(LayoutInflater.java:481) at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287) at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139) at com.serenegiant.usbcameratest.MainActivity.onCreate(MainActivity.java:61) at android.app.Activity.performCreate(Activity.java:7893) at android.app.Activity.performCreate(Activity.java:7880) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3287) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3461) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2048) at android.os.Handler.dispatchMessage(Handler.java:107) at android.os.Looper.loop(Looper.java:227) at android.app.ActivityThread.main(ActivityThread.java:7573) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:953) Caused by: java.lang.UnsupportedOperationException: TextureView doesn't support displaying a background drawable com.serenegiant.usbcameratest E/AndroidRuntime: at android.view.TextureView.setBackgroundDrawable(TextureView.java:326) at android.view.View.setBackground(View.java:23033) at android.view.View.<init>(View.java:5869) at android.view.View.<init>(View.java:5265) at android.view.TextureView.<init>(TextureView.java:166) at com.serenegiant.widget.SimpleUVCCameraTextureView.<init>(SimpleUVCCameraTextureView.java:50) at com.serenegiant.widget.SimpleUVCCameraTextureView.<init>(SimpleUVCCameraTextureView.java:46) |

解决方法:
打开activity_main.xml，把SimpleUVCCameraTextureView的android:background="#ff000000" 这一句删掉即可。