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這篇文章主要介紹“android調(diào)用JNI SO動(dòng)態(tài)庫(kù)的方法是什么”,在日常操作中,相信很多人在android調(diào)用JNI SO動(dòng)態(tài)庫(kù)的方法是什么問(wèn)題上存在疑惑,小編查閱了各式資料,整理出簡(jiǎn)單好用的操作方法,希望對(duì)大家解答”android調(diào)用JNI SO動(dòng)態(tài)庫(kù)的方法是什么”的疑惑有所幫助!接下來(lái),請(qǐng)跟著小編一起來(lái)學(xué)習(xí)吧!
1、動(dòng)態(tài)調(diào)用使用已經(jīng)編譯好的動(dòng)態(tài)庫(kù).so文件
2、android調(diào)用ndk類
生成后的so文件
public class SerialPort { p */ public static native int GetSOVer(String ar); static { System.loadLibrary("serialport");//初始化so庫(kù)(注意這里添加是需要去掉lib與.so) } }
3、.c文件添加
/* * Copyright 2009-2011 Cedric Priscal * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include <jni.h> #include <termios.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <string.h> #include "M1900_drv.h" #include "SerialPort.h" #include "include/tinyalsa/audio_i2s.h" #include "include/tinyalsa/asoundlib.h" #include "android/log.h" #include "newland_linux_so.h" static const char *TAG = "serial_port"; #define LOGI(fmt, args...) __android_log_print(ANDROID_LOG_INFO, TAG, fmt, ##args) #define LOGD(fmt, args...) __android_log_print(ANDROID_LOG_DEBUG, TAG, fmt, ##args) #define LOGE(fmt, args...) __android_log_print(ANDROID_LOG_ERROR, TAG, fmt, ##args) //測(cè)試 Java_(固定)_com_littt_util_SerialPort(android包名原來(lái)的.更改為_(kāi),string ar 傳入的字符串參數(shù),JNIEnv *env, jclass固定寫(xiě)法) JNIEXPORT jint JNICALL Java_com_littt_util_SerialPort_GetSOVer(JNIEnv *env, jclass clazz, jstring ar) { // TODO: implement GetSOVer() return 9;//返回一個(gè)9的值 }
4、.h頭文件中聲明
/* DO NOT EDIT THIS FILE - it is machine generated */ #include <jni.h> /* Header for class android_serialport_api_SerialPort */ #ifndef _Included_android_serialport_api_SerialPort #define _Included_android_serialport_api_SerialPort #ifdef __cplusplus extern "C" { #endif JNIEXPORT jint JNICALL Java_com_littt_util_SerialPort_GetSOVer(JNIEnv *env, jclass clazz,jstring v); #ifdef __cplusplus } #endif #endif
5、頭文件與c文件寫(xiě)好了,就需要在CMake 中添加.c與.h都需要添加
# For more information about using CMake with Android Studio, read the # documentation: https://d.android.com/studio/projects/add-native-code.html # Sets the minimum version of CMake required to build the native library. cmake_minimum_required(VERSION 3.4.1) # Creates and names a library, sets it as either STATIC # or SHARED, and provides the relative paths to its source code. # You can define multiple libraries, and CMake builds them for you. # Gradle automatically packages shared libraries with your APK. add_library( # Sets the name of the library. serialport # Sets the library as a shared library. SHARED # Provides a relative path to your source file(s). M1900_drv.c M1900_drv.h audio_i2s.c linux_so.cpp mixer.c include/tinyalsa/asoundlib.h include/tinyalsa/audio_i2s.h ) # Searches for a specified prebuilt library and stores the path as a # variable. Because CMake includes system libraries in the search path by # default, you only need to specify the name of the public NDK library # you want to add. CMake verifies that the library exists before # completing its build. find_library( # Sets the name of the path variable. log-lib # Specifies the name of the NDK library that # you want CMake to locate. log) # Specifies libraries CMake should link to your target library. You # can link multiple libraries, such as libraries you define in this # build script, prebuilt third-party libraries, or system libraries. target_link_libraries( # Specifies the target library. serialport # Links the target library to the log library # included in the NDK. ${log-lib}) set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -s") set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -s")
6、在build.gradle同樣需要配置
plugins { id 'com.android.application' } android { compileSdkVersion 28 buildToolsVersion "28.0.3" defaultConfig { applicationId "com.littt.interphone" minSdkVersion 17 targetSdkVersion 28 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" // cmake externalNativeBuild { cmake { cppFlags "" abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64' } } } externalNativeBuild { cmake { path "src/main/cpp/CMakeLists.txt" version "3.10.2" } } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' } } sourceSets { main { jniLibs.srcDirs = ['libs'] } } compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } ndkVersion '22.1.7171670' } dependencies { // implementation 'androidx.appcompat:appcompat:1.2.0' // implementation 'com.google.android.material:material:1.2.1' }
7、如果靜態(tài)調(diào)用可以成功,那么就可以生成動(dòng)態(tài)so庫(kù)文件
點(diǎn)擊圖中錘子會(huì)進(jìn)行編譯。
紅框中生成后 so文件
7.1、生成的.so文件(工程文件夾模式)目錄為app/build/intermediates/ndk/lib,將其復(fù)制到另一個(gè)工程的app/lib目錄下。
7.2、要使用上述的.so文件 ,必須將工程的包名改為生成.so文件時(shí)的包名,要不然 編譯能通過(guò),但是app不能正常運(yùn)行。logcat會(huì)提示找不到所調(diào)用函數(shù)的實(shí)現(xiàn)。
7.3、將so文件復(fù)制到需要的路徑下。
7.4、在gradle.properties中最后加一行:android.useDeprecatedNdk=true。
到此,關(guān)于“android調(diào)用JNI SO動(dòng)態(tài)庫(kù)的方法是什么”的學(xué)習(xí)就結(jié)束了,希望能夠解決大家的疑惑。理論與實(shí)踐的搭配能更好的幫助大家學(xué)習(xí),快去試試吧!若想繼續(xù)學(xué)習(xí)更多相關(guān)知識(shí),請(qǐng)繼續(xù)關(guān)注億速云網(wǎng)站,小編會(huì)繼續(xù)努力為大家?guī)?lái)更多實(shí)用的文章!
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