System.loadLibrary("native-lib")出错

出错原因：没有把项目中的so文件复制到data/data/应用包名/lib目录下面

我们需要在build.gradle(Module:app)文件里面添加 一句：

sourceSets.main.jniLibs.srcDirs = ['libs']

完整如下：
apply plugin: ‘com.android.application’

android {
sourceSets.main.jniLibs.srcDirs = [‘libs’]
compileSdkVersion 25
buildToolsVersion “25.0.2”
defaultConfig {
applicationId “com.example.android”
minSdkVersion 19
targetSdkVersion 25
versionCode 1
versionName “1.0”
testInstrumentationRunner “android.support.test.runner.AndroidJUnitRunner”
}
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-v7:25.3.1’
compile ‘com.android.support.constraint:constraint-layout:1.0.2’
testCompile ‘junit:junit:4.12’
}