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Android app开发因为效率、跨平台、安全等考虑,常常将核心模块用c/c++实现然后通过jni接口跟java交互。Android Studio下采用c/c++和java协同开发需要做以下修改:
1.build.gradle
apply plugin: 'com.android.application' android { compileSdkVersion 25 buildToolsVersion "25.0.2" defaultConfig { applicationId "zhw.jpegclapp" minSdkVersion 21 targetSdkVersion 25 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" ndk { moduleName "libjpegNativeLib" ldLibs "log", "z", "m" abiFilters "armeabi-v7a" } } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } externalNativeBuild { ndkBuild { path 'src/main/cpp/Android.mk' } } } 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-v7:25.0.1' testCompile 'junit:junit:4.12' }
2.ndk中要使用__android_log_print 打印:
在Android.mk中加入
LOCAL_LDLIBS+= -L$(SYSROOT)/usr/lib -llog