CallIntMethod导致-1 - ANDROID JNI [英] CallIntMethod result -1 - ANDROID JNI

问题描述

我想从C中使用Android的共享preferences
为了方便使用，我有一个类和它的一些方法（getIniParamInt，getIniParamString等）的东西JAVA正常工作。

I would like to use the ANDROID SharedPreferences from C. For easier usage, I've a class and some methods for it (getIniParamInt, getIniParamString etc.) The things works fine in JAVA.

问题是，如果我调用该方法从JNI它发回-1到C.
我的JAVA code的部分（简化测试，共享preF删除等）：

The problem is, if I call the method from jni it sends back -1 to C. Parts of my JAVA code (simplified for test, SharedPref. removed etc.):

public class IniManipulate {
   public int getIniParamInt(String mezoNev)
                  {return 999;}  // settings.getInt("abc", -9999);

C code：

C code:

const char* paramOut 
paramOut = "abc";
jmethodID mid = (*env)->GetMethodID(env,cls1,"getIniParamInt","(Ljava/lang/String;)I");
     if (mid == NULL) {cDebug1 = 888;return; }
jstring* parameter = (*env)->NewStringUTF(env, paramOut);
     if (parameter == NULL) {return;}
jint paramInt = (jint) (*env)->CallIntMethod(env,thiz, mid, parameter);
cDebug1 = (int)paramInt;

总是与paramInt = -1返回;而不是999;

Always returns with paramInt=-1; instead of 999;

我已经挖了整个网络，我无法找到解决方案。
能否请你帮我，什么是错的CallIntMethod通话？
谢谢！

I've already digged up the whole web and I couldn't find the solution. Could you please help me, what's wrong with the CallIntMethod calling? Thanks!

推荐答案

嗯...我找到了解决办法！
问题是，在Java中code：
它必须声明所调用的方法为私有方法，而不是公众！

Hmm... I found the SOLUTION! The problem is, in Java code: It must declare the called method as private method instead of public!!!

private int getIniParamInt(String mezoNev)
              {return 999;} 

我是个初学者，所以我不知道真正的解释...我只是尝试了。
我希望这是有帮助的，谁想要使用的方法是这样的人。

I'm a beginner, so I don't know the real explanation... I just tried it. I hope it's helpful for people who wants use method like this.

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