Android的jni的调用C,C++的几个应用(基本类型,数组,类(.doc

Android的jni的调用C,C+的几个应用(基本类型，数组，类(结构体)今天是母亲节，首先祝愿全天下的母亲健康长寿！永远年轻！天天快乐！慈母手中线，游子身上衣，临行密密缝，意恐迟迟归，谁言寸草心，报得三春晖。谢谢妈妈-jernymy-开始正题啦，前些天在研究Andorid中Jni(Java Native Interface)的使用，主要是在android中调用C、C+的方法，在网上也搜集了一些文档，源码等资料，非常感谢网友的提供的宝贵经验。也是写下这个文章，希望可以帮助正在做这方面应用网友们，jni使用c语言。一、首先软件环境要搭配好，本人使用的环境是Android2.2的SDK+NDK4b，linux下的编译环境1. Windows XP2. VMware 7.1.3 build-324285 + Ubuntu 9.04中文版3. Android SDK 2.24. Android NDK r4b Linux版(crystax)，加入支持C+ exceptions, RTTI and Standard C+ Library /android/ndk-r4.php/data/android-ndk-r4-linux-x86-crystax-4.tar.bz25. Eclipse Version: 3.5.2eclipse3.5.2官方下载地址/eclipse/downloads/drops/R-3.5.2-201002111343/eclipse-SDK-3.5.2-win32.zip6. 二、配置好eclipse，并加入androiddSDK，然后通过eclipse建立一个android工程，搭建android的jni框架1. EclipseFile-New-Android Project如果此地没有Android Project，可以通过File-New-Project.，在弹出的对话框中，选择(Android)以下几项填写，其他的默认即可Project name: AndroidJniBuild Target: Android 2.2Application name: AndroidJniPackage name: com.jniCreate Activity: AndroidJniMin SDK Version: 8点击Finish即可此时，我们就可以看到我们的项目了在src-com.jni下自动生成的AndroidJni.java内容如下view plaincopy to clipboardprint?102030405060708090100110120130140150package com.jni; import android.app.Activity; import android.os.Bundle; public class AndroidJni extends Activity /* Called when the activity is first created. */ Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.main); 我们在这里新建立一个class，比如命名jernymyjni，这个作为我们的Jni的所有接口处，作为测试设计了基本类型，数组，和类(结构体)，结构体数组等。代码如下view plaincopy to clipboardprint?102030405060708090100110120130140150package com.jni; / jernymy use c style for var name public class jernymyjni char chChar; / char use ch token / short wShort; / short use w token, short same as int int nInt; / int use n token String sString; / String use s token /*- jernymy for base type declaration start -*/ /* * The char process method GetChar * param char chInput : the input char for process * return(char) : input char (chInput) upper or lower * author : jernymy * date : 20110508 * */ public native char GetChar(char chInput); /* * The char process method SetChar * param char chInput : set the input char * return(int) : status, 0-OK, other-Error * author : jernymy * date : 20110508 * */ public native int SetChar(char chInput); /* * The int process method GetInt * param int nAdd1 : add one * param int nAdd2 : add other * return(int) : sum of two add var * author : jernymy * date : 20110508 * */ public native int GetInt(int nAdd1, int nAdd2); /* * The int process method SetInt * param int nSet : set one int data * return(int) : status, 0-OK, other-Error * author : jernymy * date : 20110508 * */ public native int SetInt(int nSet); /* * The String process method GetStr * return(String) : the string for use * author : jernymy * date : 20110508 * */ public native String GetStr(); /* * The String process method PrcsStr * param String sInput : the input String for process * return(String) : the process of the input String * author : jernymy * date : 20110508 * */ public native String PrcsStr(String sInput); /* * The String process method PrcsStr * param String sSet : the set String * return(int) : status, 0-OK, other-Error * author : jernymy * date : 20110508 * */ public native int SetStr(String sSet); /*- jernymy for base type declaration end -*/ /*- jernymy for array type declaration start -*/ /* * The char array process method GetCharArray * param char chSet : the chSet char for process * return(char) : char array, upper and lower * author : jernymy * date : 20110508 * */ public native char GetCharArray(char chSet); /* * The char array process method SetCharArray * param char chSet : the chSet char array for process * return(int) : status, 0-OK, other-Error * author : jernymy * date : 20110508 * */ public native int SetCharArray(char chSet); /* * The int array process method GetIntArray * param int nAdd1 : add one array * param int nAdd2 : add other array * return(int) : sum array of two add array var * author : jernymy * date : 20110508 * */ public native int GetIntArray(int nAdd1, int nAdd2); /* * The int array process method SetIntArray * param int nSet : set one int array data * return(int) : status, 0-OK, other-Error * author : jernymy * date : 20110508 * */ public native int SetIntArray(int nSet); /* * The String array process method GetStrArray * return(String) : String array with null parameter * author : jernymy * date : 20110508 * */ public native String GetStrArray(); /* * The String array process method PrcsStrArray * param String sSet : the string with token sSet * return(String) : ervey string by token * author : jernymy * date : 20110508 * */ public native String PrcsStrArray(String sSet); /* * The String array process method SetStrArray * param String sSet : set the string array * return(int) : status, 0-OK, other-Error * author : jernymy * date : 20110508 * */ public native int SetStrArray(String sSet); /*- jernymy for array type declaration end -*/ /*- jernymy for class(struct) type declaration start -*/ /* * The jernymyjni class(struct) process method GetClass * param int nIdx : get class data by index * return(jernymyjni) : status, 0-OK, other-Error * author : jernymy * date : 20110508 * */ public native jernymyjni GetClass(int nIdx); /* * The jernymyjni class(struct) process method SetClass * param jernymyjni cClass : set class data by class index * return(int) : status, 0-OK, other-Error * author : jernymy * date : 20110508 * */ public native int SetClass(jernymyjni cClass); /*- jernymy for class(struct) type declaration end -*/ /*- jernymy for class(struct) array type declaration start -*/ /* * The jernymyjni class(struct) array process method GetClassArray * return(jernymyjni) : class array data * author : jernymy * date : 20110508 * */ public native jernymyjni GetClassArray(); /* * The jernymyjni class(struct) array process method SetClassArray * param jernymyjni cNcomnAry : set class array data * return(int) : status, 0-OK, other-Error * author : jernymy * date : 20110508 * */ public native int SetClassArray(jernymyjni acClassAry); /*- jernymy for class(struct) array type declaration end -*/ static System.loadLibrary(jernymyjni); / jernymy here is the so name 通过eclipse的生成对应的class文件，会在AndroidJnibin下生成所有的文件然后进入windowsXP的command模式开始-运行-cmd到我们的项目的所在目录，我的目录为运行javah，得到对应的jni的头文件E:workjaveworkspaceAndroidJnijavah -classpath bin com.jni.jernymyjniE:workjaveworkspaceAndroidJni此时会在当前目录下生成一个com_jni_jernymyjni.h，好了，就是它了，接下来开始编写它对应的c文件了。为了符合android的文档规范，我们需要在当前目录(AndroidJni)下先建立一个jni目录，然后再建立一个Android.mk然后把com_jni_jernymyjni.h文件copy到jni目录下。E:workjaveworkspaceAndroidJnicd jniE:workjaveworkspaceAndroidJnijnidir 驱动器 E 中的卷是 work 卷的序列号是 1C8F-CA73 E:workjaveworkspaceAndroidJnijni 的目录2011-05-08 23:09 .2011-05-08 23:09 .2011-05-08 23:08 0 Android.mk2011-05-08 22:58 3,802 com_jni_jernymyjni.h 2 个文件 3,802 字节 2 个目录 10,864,427,008 可用字节E:workjaveworkspaceAndroidJnijnicom_jni_jernymyjni.h的文件内容view plaincopy to clipboardprint?102030405060708090100110120130140150/* DO NOT EDIT THIS FILE - it is machine generated */ #include /* Header for class com_jni_jernymyjni */ #ifndef _Included_com_jni_jernymyjni #define _Included_com_jni_jernymyjni #ifdef _cplusplus extern C #endif /* * Class: com_jni_jernymyjni * Method: GetChar * Signature: (C)C */ JNIEXPORT jchar JNICALL Java_com_jni_jernymyjni_GetChar (JNIEnv *, jobject, jchar); /* * Class: com_jni_jernymyjni * Method: SetChar * Signature: (C)I */ JNIEXPORT jint JNICALL Java_com_jni_jernymyjni_SetChar (JNIEnv *, jobject, jchar); /* * Class: com_jni_jernymyjni * Method: GetInt * Signature: (II)I */ JNIEXPORT jint JNICALL Java_com_jni_jernymyjni_GetInt (JNIEnv *, jobject, jint, jint); /* * Class: com_jni_jernymyjni * Method: SetInt * Signature: (I)I */ JNIEXPORT jint JNICALL Java_com_jni_jernymyjni_SetInt (JNIEnv *, jobject, jint); /* * Class: com_jni_jernymyjni * Method: GetStr * Signature: ()Ljava/lang/String; */ JNIEXPORT jstring JNICALL Java_com_jni_jernymyjni_GetStr (JNIEnv *, jobject); /* * Class: com_jni_jernymyjni * Method: PrcsStr * Signature: (Ljava/lang/String;)Ljava/lang/String; */ JNIEXPORT jstring JNICALL Java_com_jni_jernymyjni_PrcsStr (JNIEnv *, jobject, jstring); /* * Class: com_jni_jernymyjni * Method: SetStr * Signature: (Ljava/lang/String;)I */ JNIEXPORT jint JNICALL Java_com_jni_jernymyjni_SetStr (JNIEnv *, jobject, jstring); /* * Class: com_jni_jernymyjni * Method: GetCharArray * Signature: (C)C */ JNIEXPORT jcharArray JNICALL Java_com_jni_jernymyjni_GetCharArray (JNIEnv *, jobject, jchar); /* * Class: com_jni_jernymyjni * Method: SetCharArray * Signature: (C)I */ JNIEXPORT jint JNICALL Java_com_jni_jernymyjni_SetCharArray (JNIEnv *, jobject, jcharArray); /* * Class: com_jni_jernymyjni * Method: GetIntArray * Signature: (II)I */ JNIEXPORT jintArray JNICALL Java_com_jni_jernymyjni_GetIntArray (JNIEnv *, jobject, jintArray, jintArray); /* * Class: com_jni_jernymyjni * Method: SetIntArray * Signature: (I)I */ JNIEXPORT jint JNICALL Java_com_jni_jernymyjni_SetIntArray (JNIEnv *, jobject, jintArray); /* * Class: com_jni_jernymyjni * Method: GetStrArray * Signature: ()Ljava/lang/String; */ JNIEXPORT jobjectArray JNICALL Java_com_jni_jernymyjni_GetStrArray (JNIEnv *, jobject); /* * Class: com_jni_jernymyjni * Method: PrcsStrArray * Signature: (Ljava/lang/String;)Ljava/lang/String; */ JNIEXPORT jobjectArray JNICALL Java_com_jni_jernymyjni_PrcsStrArray (JNIEnv *, jobject, jstring); /* * Class: com_jni_jernymyjni * Method: SetStrArray * Signature: (Ljava/lang/String;)I */ JNIEXPORT jint JNICALL Java_com_jni_jernymyjni_SetStrArray (JNIEnv *, jobject, jobjectArray); /* * Class: com_jni_jernymyjni * Method: GetClass * Signature: (I)Lcom/jni/jernymyjni; */ JNIEXPORT jobject JNICALL Java_com_jni_jernymyjni_GetClass (JNIEnv *, jobject, jint); /* * Class: com_jni_jernymyjni * Method: SetClass * Signature: (Lcom/jni/jernymyjni;)I */ JNIEXPORT jint JNICALL Java_com_jni_jernymyjni_SetClass (JNIEnv *, jobject, jobject); /* * Class: com_jni_jernymyjni * Method: GetClassArray * Signature: ()Lcom/jni/jernymyjni; */ JNIEXPORT jobjectArray JNICALL Java_com_jni_jernymyjni_GetClassArray (JNIEnv *, jobject); /* * Class: com_jni_jernymyjni * Method: SetClassArray * Signature: (Lcom/jni/jernymyjni;)I */ JNIEXPORT jint JNICALL Java_com_jni_jernymyjni_SetClassArray (JNIEnv *, jobject, jobjectArray); #ifdef _cplusplus #endif #endif com_jni_jernymyjni.c的文件内容+ expand sourceview plaincopy to clipboardprint?102030405060708090100110120130140150编写Android.mk，内容如下+ expand sourceview plaincopy to clipboardprint?102030405060708090100110120130140150在VMware的ubuntu9.04下编译, NDK r4b的路径在./bld/android-ndk-r4-crystax，使用该ndkbuildrootjernymy-desktop:/mnt/hgfs/workspace/AndroidJni# ./bld/android-ndk-r4-crystax/ndk-build Compile thumb : jernymyjni /mnt/hgfs/workspace/AndroidJni/libs/armeabirootjernymy-desktop:/mnt/hgfs/workspace/AndroidJni# 接下来编写我们的java的测试代码AndroidJni.java，目前为了方便调试，暂且用System.out输出，可以通过android在界面上摆放一些button，然后把信息显示到button上，就可以看到效果了现在可以先通过调试的方式，查看debug的信息。view plaincopy to clipboardprint?102030405060708090100110120130140150package com.jni; import android.app.Activity; import android.os.Bundle; public class AndroidJni extends Activity /* Called when the activity is first created. */ Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.main); System.out.println(hello); jernymyjni cJni = new jernymyjni(); System.out.println(-jernymy test jernymyjni start-); System.out.println(-display base type test); System.out.println(-GetChar(A)-); char chTmp = cJni.GetChar(A); System.out.println(String.valueOf(chTmp); System.out.println(*); System.out.println(-SetChar(A)-); int nRtn = cJni.SetChar(A); System.out.println(nRtn: + String.valueOf(nRtn); System.out.println(*); System.out.println(-GetInt(5, 10)-); int nSum = cJni.GetInt(5, 10); System.out.println(String.valueOf(nSum); System.out.println(*); System.out.println(-SetInt(10)-); nRtn = cJni.SetInt(10); System.out.println(nRtn: + String.valueOf(nRtn); System.out.println(*); System.out.println(-GetStr(Jernymy Jni GetStr)-); String sStr = cJni.GetStr(); System.out.pri