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AndroidNDK开发使用Cmake编译生成so文件
最近做串口开发需要编译不同的so文件,于是查找了各种资料,学习了一下so编译. 1.添加Cmake文件: cmake_minimum_required(VERSION 3.4.1) //cmake版本 include_directories(src/main/jni/serial_port) //引入的jni文件路径 aux_source_directory(src/main/jni SRC_FILE) //src文件路径 add_library(serial_port SHARED ${SRC_FILE}) find_library(log-lib log) target_link_libraries(serial_port ${log-lib}) 复制代码 2.添加Cmake依赖: externalNativeBuild { cmake { cppFlags "" abiFilters "arm64-v8a","armeabi-v7a"//生成的so平台类型 } } 复制代码 externalNativeBuild { cmake { path 'CMakeLists.txt'//Cmake地址 } } 复制代码 3.jni文件如下: 4.Android.mk文件: # # Copyright 2009 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. # LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) TARGET_PLATFORM := android-3 LOCAL_MODULE := serial_port //模块名称 LOCAL_SRC_FILES := SerialPort.c LOCAL_LDLIBS := -llog include $(BUILD_SHARED_LIBRARY) 复制代码 5.Application.mk文件 APP_ABI := arm64-v8a,armeabi-v7a//配置abi平台 复制代码 6.SerialPort.c文件: /* * 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 #include #include #include #include #include #include #include "SerialPort.h" #include "android/log.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) static speed_t getBaudrate(jint baudrate) { switch(baudrate) { case 0: return B0; case 50: return B50; case 75: return B75; case 110: return B110; case 134: return B134; case 150: return B150; case 200: return B200; case 300: return B300; case 600: return B600; case 1200: return B1200; case 1800: return B1800; case 2400: return B2400; case 4800: return B4800; case 9600: return B9600; case 19200: return B19200; case 38400: return B38400; case 57600: return B57600; case 115200: return B115200; case 230400: return B230400; case 460800: return B460800; case 500000: return B500000; case 576000: return B576000; case 921600: return B921600; case 1000000: return B1000000; case 1152000: return B1152000; case 1500000: return B1500000; case 2000000: return B2000000; case 2500000: return B2500000; case 3000000: return B3000000; case 3500000: return B3500000; case 4000000: return B4000000; default: return -1; } } /* * Class: android_serialport_SerialPort * Method: open * Signature: (Ljava/lang/String;II)Ljava/io/FileDescriptor; */ JNIEXPORT jobject JNICALL Java_android_1serialport_1api_SerialPort_open (JNIEnv *env, jclass thiz, jstring path, jint baudrate, jint flags) { int fd; speed_t speed; jobject mFileDescriptor; /* Check arguments */ { speed = getBaudrate(baudrate); if (speed == -1) { /* TODO: throw an exception */ LOGE("Invalid baudrate"); return NULL; } } /* Opening device */ { jboolean iscopy; const char *path_utf = (*env)->GetStringUTFChars(env, path, &iscopy); LOGD("Opening serial port %s with flags 0x%x", path_utf, O_RDWR | flags); fd = open(path_utf, O_RDWR | flags); LOGD("open() fd = %d", fd); (*env)->ReleaseStringUTFChars(env, path, path_utf); if (fd == -1) { /* Throw an exception */ LOGE("Cannot open port"); /* TODO: throw an exception */ return NULL; } } /* Configure device */ { struct termios cfg; LOGD("Configuring serial port"); if (tcgetattr(fd, &cfg)) { LOGE("tcgetattr() failed"); close(fd); /* TODO: throw an exception */ return NULL; } cfmakeraw(&cfg); cfsetispeed(&cfg, speed); cfsetospeed(&cfg, speed); if (tcsetattr(fd, TCSANOW, &cfg)) { LOGE("tcsetattr() failed"); close(fd); /* TODO: throw an exception */ return NULL; } } /* Create a corresponding file descriptor */ { jclass cFileDescriptor = (*env)->FindClass(env, "java/io/FileDescriptor"); jmethodID iFileDescriptor = (*env)->GetMethodID(env, cFileDescriptor, "", "()V"); jfieldID descriptorID = (*env)->GetFieldID(env, cFileDescriptor, "descriptor", "I"); mFileDescriptor = (*env)->NewObject(env, cFileDescriptor, iFileDescriptor); (*env)->SetIntField(env, mFileDescriptor, descriptorID, (jint)fd); } return mFileDescriptor; } /* * Class: cedric_serial_SerialPort * Method: close * Signature: ()V */ JNIEXPORT void JNICALL Java_android_1serialport_1api_SerialPort_close (JNIEnv *env, jobject thiz) { jclass SerialPortClass = (*env)->GetObjectClass(env, thiz); jclass FileDescriptorClass = (*env)->FindClass(env, "java/io/FileDescriptor"); jfieldID mFdID = (*env)->GetFieldID(env, SerialPortClass, "mFd", "Ljava/io/FileDescriptor;"); jfieldID descriptorID = (*env)->GetFieldID(env, FileDescriptorClass, "descriptor", "I"); jobject mFd = (*env)->GetObjectField(env, thiz, mFdID); jint descriptor = (*env)->GetIntField(env, mFd, descriptorID); LOGD("close(fd = %d)", descriptor); close(descriptor); } jstring Java_com_example_compilesodemo_MainActivity_sayHello(JNIEnv* env,jobject jobj){ char* text="I am from C"; return (*env)->NewStringUTF(env,text); } 复制代码 7.SerialPort.h文件: /* DO NOT EDIT THIS FILE - it is machine generated */ #include /* Header for class android_serialport_api_SerialPort */ #ifndef _Included_android_serialport_api_SerialPort #define _Included_android_serialport_api_SerialPort #ifdef __cplusplus extern "C" { #endif /* * Class: android_serialport_api_SerialPort * Method: open * Signature: (Ljava/lang/String;II)Ljava/io/FileDescriptor; */ JNIEXPORT jobject JNICALL Java_android_1serialport_1api_SerialPort_open (JNIEnv *, jclass, jstring, jint, jint); /* * Class: android_serialport_api_SerialPort * Method: close * Signature: ()V */ JNIEXPORT void JNICALL Java_android_1serialport_1api_SerialPort_close (JNIEnv *, jobject); #ifdef __cplusplus } #endif #endif 复制代码 8.运行项目:直接跑项目或者使用gradle构建so生成的so文件如下:这里大家根据自己的需求配置生成不同的so文件 9.项目中引入so文件:如果不引入so文件初始化和调用时会报错,提示找不到so文件, 10.Java调用so的测试代码如下: public class MainActivity extends AppCompatActivity { private static final String TAG = MainActivity.class.getName(); { System.loadLibrary("serial_port");//加载so库 } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { TextView textView = ((TextView)findViewById(R.id.tv_test)); textView.setText(sayHello()); Log.d(TAG,"-----传入的数据为:------"+ textView.getText().toString()); } public native String sayHello();//调用jni方法 } 复制代码 11.运行效果如下: 12.打印日志如下: 13.总结:可以看到项目demo成功运行,期前也遇到不少问题,so的加载和调用,jni初始化,数据传递等等,如果有兴趣的同学可以自己去试试,学到手的东西才是自己的。本文是以串口通信的so为例,所以里面的头文件及数据调用的方法都是在加载串口数据,不过我为了测试所以暂时只写了一个简单的,因为测试串口需要设备和串口通信助手,这里先不讲,后面有空会逐一讲解串口通信流程和实战demo. 14.项目源码如下:gitee.com/jackning_ad… |
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