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安卓JNI传参数

分类： Android平台

2016-04-08 09:02:34


点击(此处)折叠或打开

  1. #include <stdlib.h>
  2. #include <string.h>
  3. #include <stdio.h>
  4. #include <jni.h>
  5. #include <assert.h>
  6. #include "YN020_Function.h"


  9. # define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))

  11. #define JNIREG_CLASS "com/example/jnitestfun/MainActivity"


  14. #include <android/log.h>


  17. #define TAG "Jniface"

  19. #define LOGI(...) __android_log_print(ANDROID_LOG_INFO,TAG,__VA_ARGS__)

  21. #define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, TAG, __VA_ARGS__)

  23. #define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,TAG,__VA_ARGS__)



  27. JNIEXPORT jstring JNICALL
  28. stringFromJni(JNIEnv *env, jobject clazz)
  29. {
  30.  
  31.     jstring str = (*env)->NewStringUTF(env, "Hello From Jni");
  32.     return str;
  33. }



  37. JNIEXPORT void JNICALL
  38. stringToJni(JNIEnv *env, jobject clazz, jstring val)
  39. {

  41.     char *str = (char *)(*env)->GetStringUTFChars(env, val, JNI_FALSE);
  42.     LOGD("%s str=%s\n", __func__, str);
  43. }


  46. JNIEXPORT jfloat JNICALL
  47. floatFromJni(JNIEnv *env, jobject clazz)
  48. {
  49.     return (jfloat)1.34;
  50. }


  53. JNIEXPORT void JNICALL
  54. floatToJni(JNIEnv *env, jobject clazz, jfloat val)
  55. {
  56.     float f = (float)val;
  57.     LOGD("%s f=%f\n", __func__, f);
  58. }



  62. JNIEXPORT jint JNICALL
  63. intFromJni(JNIEnv *env, jobject clazz)
  64. {
  65.     return (jint)25;
  66. }


  69. JNIEXPORT void JNICALL
  70. intToJni(JNIEnv *env, jobject clazz, jint val)
  71. {

  73.     int i = (int)val;
  74.     LOGD("%s i=%d\n", __func__, i);
  75. }



  79. JNIEXPORT jint JNICALL
  80. SendCmdToJni(JNIEnv *env, jobject clazz,jint p_wCmdCode,jint p_nParam1, jint p_nParam2, jint p_nParam3, jint p_nParam4)
  81. {
  82.     char ret;

  84.     ret = CommandProcess((UINT16) p_wCmdCode, (UINT32) p_nParam1, (UINT32) p_nParam2, (UINT32) p_nParam3, (UINT32) p_nParam4);
  85.     LOGD("%s p_wCmdCode=%d\n", __func__, p_wCmdCode);
  86.     LOGD("%s p_nParam1=%d\n", __func__, p_nParam1);
  87.     LOGD("%s p_nParam2=%d\n", __func__, p_nParam2);
  88.     LOGD("%s p_nParam3=%d\n", __func__, p_nParam3);
  89.     LOGD("%s p_nParam4=%d\n", __func__, p_nParam4);
  90.     LOGD("%s ret=%d\n", __func__, ret);
  91.     return (jint)ret;
  92. }



  96. JNIEXPORT jint JNICALL
  97. JNI_Init_Device(JNIEnv *env, jobject clazz)
  98. {
  99.     char ret;

  101.     ret = Init_Device(UART_COMMUNICATION,"/dev/ttyUSB0",38400);
  102.     if(ret != 0)
  103.     {
  104.         LOGD("%s Init Device fail ret=%d\n", __func__, ret);
  105.         return -1;
  106.     }
  107.     LOGD("%s ret=%d\n", __func__, ret);
  108.     return (jint)ret;
  109. }



  113. static JNINativeMethod method_table[] = {
  114.     { "intFromJni" , "()I" , (void*)intFromJni },
  115.     { "intToJni" , "(I)V" , (void*)intToJni },
  116.     { "floatFromJni" , "()F" , (void*)floatFromJni },
  117.     { "floatToJni" , "(F)V" , (void*)floatToJni },
  118.     { "stringFromJni" , "()Ljava/lang/String;" , (void*)stringFromJni },
  119.     { "stringToJni" , "(Ljava/lang/String;)V", (void*)stringToJni },
  120.     { "SendCmdToJni" , "(IIIII)I", (void*)SendCmdToJni },
  121.     { "JNI_Init_Device" , "()I", (void*)JNI_Init_Device },
  122. };




  127. static int registerNativeMethods(JNIEnv* env, const char* className,
  128.         JNINativeMethod* gMethods, int numMethods)
  129. {
  130.     jclass clazz;
  131.     clazz = (*env)->FindClass(env, className);
  132.     if (clazz == NULL) {
  133.         return JNI_FALSE;
  134.     }
  135.     if ((*env)->RegisterNatives(env, clazz, gMethods, numMethods) < 0) {
  136.         return JNI_FALSE;
  137.     }

  139.     return JNI_TRUE;
  140. }

  142. int register_basic_ndk_param(JNIEnv *env)
  143. {

  145.     return registerNativeMethods(env, JNIREG_CLASS,
  146.             method_table, NELEM(method_table));
  147. }


  150. JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved)
  151. {
  152.     JNIEnv* env = NULL;
  153.     jint result = -1;

  155.     if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_4) != JNI_OK) {
  156.         return result;
  157.     }

  159.     register_basic_ndk_param(env);

  161.  
  162.     return JNI_VERSION_1_4;
  163. }
写完jni后要编写makefile文件也就是Android.mk

点击(此处)折叠或打开

  1. LOCAL_PATH := $(call my-dir)

  3. include $(CLEAR_VARS)

  5. LOCAL_MODULE := Jniface
  6. LOCAL_SRC_FILES := Jniface.c YN020_Function.c CommBase.c Encryption.c md5.c uart.c usb_scsi.c


  9. LOCAL_LDLIBS:=-L$(SYSROOT)/usr/lib -llog


  12. include $(BUILD_SHARED_LIBRARY)

  14. LOCAL_PATH := $(call my-dir)


对应的安卓java代码如下：

点击(此处)折叠或打开

  1. package com.example.jnitestfun;

  3. import android.os.Bundle;
  4. import android.util.Log;
  5. import android.view.View;
  6. import android.widget.EditText;
  7. import android.app.Activity;


  10. public class MainActivity extends Activity {

  12.     private static final String TAG = "Nguhyw--Jnitest";
  13.     private int ival;
  14.     private float fval;
  15.     private String str;
  16.     private int ret;
  17.     
  18.     EditText TextCmd;
  19.     EditText TextParm1;
  20.     EditText TextParm2;
  21.     EditText TextParm3;
  22.     EditText TextParm4;
  23.     
  24.     
  25.     @Override
  26.     protected void onCreate(Bundle savedInstanceState) {
  27.         super.onCreate(savedInstanceState);
  28.         setContentView(R.layout.activity_main);
  29.         
  30.         Log.d(TAG,"onCreate");
  31.         
  32.         ival = intFromJni();
  33.         Log.d(TAG,"ival="+ival);
  34.         
  35.         intToJni((int)123);
  36.         
  37.         fval = floatFromJni();
  38.         Log.d(TAG,"fval="+fval);
  39.         
  40.         floatToJni((float)456.78);
  41.         
  42.         str = stringFromJni();
  43.         Log.d(TAG,"str="+str);
  44.         stringToJni("Hello From Java");
  45.         TextCmd = (EditText) findViewById(R.id.editText1);
  46.         TextParm1 = (EditText) findViewById(R.id.editText2);
  47.         TextParm2 = (EditText) findViewById(R.id.editText3);
  48.         TextParm3 = (EditText) findViewById(R.id.editText4);
  49.         TextParm4 = (EditText) findViewById(R.id.editText5);
  50.     }
  51.     
  52.     
  53.     public void InitDevClick(View v){
  54.          int ret = JNI_Init_Device();
  55.          Log.d(TAG,"JNI_Init_Device ret="+ret);
  56.     }
  57.     
  58.     public void ResetDevClick(View v){
  59.         int ret = SendCmdToJni(161,0,0,0,0);
  60.         Log.d(TAG,"SendCmdToJni ret="+ret);
  61.     }
  62.     
  63.     public void SendCmdClick(View v){
  64.         int ret = SendCmdToJni(0,0,0,0,0);
  65.         Log.d(TAG,"SendCmdToJni ret="+ret);
  66.     }
  67.     
  68.     public void SendPram(View v){
  69.         String Strcmd = "0";

  71.         Strcmd = TextCmd.getText().toString();
  72.         int NumCmd = Integer.valueOf(Strcmd).intValue();
  73.         Log.d(TAG,"NumCmd = "+NumCmd);     
  74.         
  75.         Strcmd = TextParm1.getText().toString();
  76.         int NumParm1 = Integer.valueOf(Strcmd).intValue();
  77.         Log.d(TAG,"NumParm1 = "+NumParm1);
  78.         
  79.         Strcmd = TextParm2.getText().toString();
  80.         int NumParm2 = Integer.valueOf(Strcmd).intValue();
  81.         Log.d(TAG,"NumParm2 = "+NumParm2);
  82.         
  83.         Strcmd = TextParm3.getText().toString();
  84.         int NumParm3 = Integer.valueOf(Strcmd).intValue();
  85.         Log.d(TAG,"NumParm3 = "+NumParm3);
  86.         
  87.         Strcmd = TextParm4.getText().toString();
  88.         int NumParm4 = Integer.valueOf(Strcmd).intValue();
  89.         Log.d(TAG,"NumParm4 = "+NumParm4);
  90.         
  91.         int ret = SendCmdToJni(NumCmd,NumParm1, NumParm2, NumParm3, NumParm4);
  92.         Log.d(TAG,"SendCmdToJni NumCmd="+NumCmd+" NumParm1="+NumParm1+" NumParm2"+NumParm2+" NumParm3="+NumParm3+" NumParm4"+NumParm4+" ret="+ret);
  93.     }
  94.     
  95.     private native int JNI_Init_Device();
  96.     private native int SendCmdToJni(int p_wCmdCode,int p_nParam1, int p_nParam2, int p_nParam3, int p_nParam4);
  97.     private native int intFromJni();
  98.     private native void intToJni(int val);
  99.     private native float floatFromJni();
  100.     private native void floatToJni(float val);
  101.     private native String stringFromJni();
  102.     private native void stringToJni(String str);
  103.     
  104.     static {
  105.         System.loadLibrary("Jniface");
  106.     }
  107.     
  108. }

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