[Android jni开发系列]AndroidStudio jni开发常见问题

前面总结过两种方式进行Android ndk开发，今天再介绍一种利用AndroidStudio进行ndk开发的方式，和系列二中的方式差不多，不过不需要编译Android.mk和Application.mk，更为简单。

利用《[Android jni开发系列(二)]AndroidStudio移植eclipse NDK项目开发》中配置的javah命令，生成包含native方法java类j对应jni头文件，编写对应的c文件，不清楚地方可查看前一篇文章

此时直接编译会出现下面错误：

Error:Execution failed for task ':app:compileDebugNdk'.
> Error: Your project contains C++ files but it is not using a supported native build system.
Consider using CMake or ndk-build integration with the stable Android Gradle plugin:
 https://developer.android.com/studio/projects/add-native-code.html
or use the experimental plugin:
 https://developer.android.com/studio/build/experimental-plugin.html.

解决方法：在gradle.properties添加如下行

android.useDeprecatedNdk=true

此时就可以直接编译使用了，此时生成的so库名称为libapp.so,如需修改so名称，需要在build.gradle中配置，如下：

    defaultConfig {
        applicationId "com.jason.jni.demo1"
        minSdkVersion 21
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        ndk {
            moduleName "ndk_test"
        }
    }

另外需要注意的是，如果在ndk下配置了abiFilters，还需要考虑当前ndk版本是否支持，否则编译时候会出现下面错误：

Android NDK: The armeabi ABI is no longer supported. Use armeabi-v7a.    
Android NDK: NDK Application 'local' targets unknown ABI(s): armeabi    
Android NDK: Please fix the APP_ABI definition in C:/Users/yinjb/AppData/Local/Android/Sdk/ndk-bundle/build//../build/core/default-application.mk    


C:/Users/yinjb/AppData/Local/Android/Sdk/ndk-bundle/build//../build/core/setup-app.mk:79: *** Android NDK: Aborting    .  Stop.


:app:compileDebugNdk FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileDebugNdk'.
> com.android.ide.common.process.ProcessException: Error while executing process C:\Users\yinjb\AppData\Local\Android\Sdk\ndk-bundle\ndk-build.cmd with arguments {NDK_PROJECT_PATH=null APP_BUILD_SCRIPT=F:\github\JniDemo1\app\build\intermediates\ndk\debug\Android.mk APP_PLATFORM=android-26 NDK_OUT=F:\github\JniDemo1\app\build\intermediates\ndk\debug\obj NDK_LIBS_OUT=F:\github\JniDemo1\app\build\intermediates\ndk\debug\lib APP_ABI=armeabi-v7a,armeabi,x86}

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

完整的build.gradle如下：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.0"
    defaultConfig {
        applicationId "com.jason.jni.demo1"
        minSdkVersion 21
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        ndk {
            moduleName "ndk_test"
                       ldLibs "log", "z", "m"
           abiFilters "armeabi", "armeabi-v7a", "x86"  //ndk 版本不能用最新的，本人测试android-ndk-r15c可以，其它的没试
//           abiFilters "armeabi-v7a", "x86" //ndk版本17.0.4640043 rc1不支持armeabi，否则编译会出现上面错误
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.+'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
}

三种方式的jni开发demo下载