在 Android Studio 中使用OpenCV所遇到问题，androidopencv

在 Android Studio 中使用OpenCV所遇到问题，androidopencv

Android Studio 中使用OpenCV所遇到问题

一、关于如何生成.h文件

网上查了很多资料，大部分都是说需要切换到build/intermediates/classes/debug/文件目下，然后怎么搞怎么搞，其实不必要，也不用配置-classpath的环境变量。

• 直接从 Terminal 里切换进入 <You Project> / src / main / java 目录，执行javah命令，然后 包名 + 类名，生成的.h文件便会在该路径下，如图：
  
  

二、遇到错误：

Error:Execution failed for task ':app:compileDebugNdk'.
> com.android.ide.common.process.ProcessException:org.gradle.process.internal.ExecException: Process 'command '
C\:\\Tools\\adt-bundle-windows-x86_64-20140702\\android-ndk-r10c\\ndk-build.cmd'' finished with non-zero exit value 2

1. May be this is known NDK bug. Try to add empty .c file to your jni dir (like empty.c).

2. Try adding this to the build.gradle file:

android {
	...
	sourceSets.main {
	   jni.srcDirs = [ ]
	}


}

注：可能是NDK的Bug，在编译时，还必须在jni目录生成一个空的.c文件。

三、遇到错误

Error:Error: NDK integration is deprecated in the current plugin.  Consider trying the new experimental plugin.  For details, see http://tools.android.com/tech-docs/new-build-system/gradle-experimental.  Set "android.useDeprecatedNdk=true" in gradle.properties to continue using the current NDK integration.

http://stackoverflow.com/questions/31979965/after-updating-android-studio-to-version-1-3-0-i-am-getting-ndk-integration-is

Here is how to solve this issue :

1. add gradle.properties file to root folder of your project
2. add 'android.useDeprecatedNdk=true' to gradle.properties file

Here is my gradle.properties :

# Project-wide Gradle settings.

# IDE (e.g. Android Studio) users:
# Gradle settings configured through the IDE *will override*
# any settings specified in this file.

# For more details on how to configure your build environment visit
# http://www.gradle.org/docs/current/userguide/build_environment.html

# Specifies the JVM arguments used for the daemon process.
# The setting is particularly useful for tweaking memory settings.
# Default value: -Xmx10248m -XX:MaxPermSize=256m
# org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8

# When configured, Gradle will run in incubating parallel mode.
# This option should only be used with decoupled projects. More details, visit
# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
# org.gradle.parallel=true

android.useDeprecatedNdk=true

And add it to root of your project :

And rebuild your project.

四、遇到错误

"com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.8.0_60\bin\java.exe'' finished with non-zero exit value 2"

导致原因：项目中出现了重复的依赖。删除依赖项便可很容易地解决该问题。

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