Android加載機器學習分類器問題

Android加載機器學習分類器問題，我們用的是較笨的辦法即先把文件放在res中然後在程序啓動時放到SD卡然後獲取SD卡指定路徑。

如果大家有好的辦法還請回複本文。

先將分類器文件放到res下的raw目錄，然後添加代碼如下：

//讀取分類器文件寫入SD卡目錄

public void saveToSDCard(String name) throws Throwable { 
        InputStream inStream = this.getResources().openRawResource(R.raw.haarcascade_frontalface_alt2); 
        File file = new File(Environment.getExternalStorageDirectory(), name);
        path=file.getAbsolutePath();
        Log.e("fhh", file.getAbsolutePath());
        FileOutputStream fileOutputStream = new FileOutputStream(file);//存入SDCard 
        byte[] buffer = new byte[1024]; 
        ByteArrayOutputStream outStream = new ByteArrayOutputStream(); 
        int len = 0; 
        while((len = inStream.read(buffer)) != -1) { 
            outStream.write(buffer, 0, len); 
        } 
        byte[] bs = outStream.toByteArray(); 
        fileOutputStream.write(bs); 
        outStream.close(); 
        inStream.close(); 
        fileOutputStream.flush(); 
        fileOutputStream.close(); 
    }

用的時候直接將path以jstring傳給JNI就可以了，到JNI再轉一下即可

char* jstringTostring(JNIEnv* env, jstring jstr)
{
 char* rtn = NULL;
 jclass clsstring = env->FindClass("java/lang/String");
 jstring strencode = env->NewStringUTF("utf-8");
 jmethodID mid = env->GetMethodID(clsstring, "getBytes", "(Ljava/lang/String;)[B");
 jbyteArray barr= (jbyteArray)env->CallObjectMethod(jstr, mid, strencode);
 jsize alen = env->GetArrayLength(barr);
 jbyte* ba = env->GetByteArrayElements(barr, JNI_FALSE);
 if (alen > 0)
 {
 rtn = (char*)malloc(alen + 1);

 memcpy(rtn, ba, alen);
 rtn[alen] = 0;
 }
 env->ReleaseByteArrayElements(barr, ba, 0);
 return rtn;
}