jni反射java类SharePreference，实现本地持久化存储

/**

• 获取Context对象
• @param env
• @return
  */
  static jobject getApplication(JNIEnv *env) {
  jobject application = NULL;
  //反射ActivityThread
  jclass activity_thread_clz = env->FindClass("android/app/ActivityThread");
  if (activity_thread_clz != NULL) {
  //反射currentApplication方法
  jmethodID currentApplication = env->GetStaticMethodID(
  activity_thread_clz, "currentApplication", "()Landroid/app/Application;");
  if (currentApplication != NULL) {
  //执行反射currentApplication方法
  application = env->CallStaticObjectMethod(activity_thread_clz, currentApplication);
  } else {
  LOGE("Cannot find method: currentApplication() in ActivityThread.");
  }
  //释放内存
  env->DeleteLocalRef(activity_thread_clz);
  } else {
  LOGE("Cannot find class: android.app.ActivityThread");
  }
  return application;
  }

/**

• 反射getSharedPreferences获取SharedPreferences对象
• @param env
• @param fileName
• @return
  */
  jobject getSharedPreferencesNative(JNIEnv *env,const char *fileName) {
  //反射Context类
  jclass cls_Context = env->FindClass("android/content/Context");
  //反射Context类getSharedPreferences方法
  jmethodID mid_getSharedPreferences = env->GetMethodID(cls_Context,
  "getSharedPreferences",
  "(Ljava/lang/String;I)Landroid/content/SharedPreferences;");
  //反射Context类MODE_PRIVATE属性
  jfieldID fid_MODE_PRIVATE = env->GetStaticFieldID(cls_Context, "MODE_PRIVATE", "I");
  //获取Context类MODE_PRIVATE属性值
  jint int_MODE_PRIVATE = env->GetStaticIntField(cls_Context, fid_MODE_PRIVATE);
  //参数类型转换
  jstring o_prefs_name = Str2Jstring(env, fileName);
  //执行反射方法
  jobject obj_sharedPreferences = env->CallObjectMethod(getApplication(env),
  mid_getSharedPreferences, o_prefs_name,
  int_MODE_PRIVATE);
  //释放内存
  env->DeleteLocalRef(cls_Context);
  env->DeleteLocalRef(o_prefs_name);
  return obj_sharedPreferences;
  }

/**

• 设置key值
• @param env
• @param fileName
• @param keyName
• @param value
• @return
  */
  bool setKey(JNIEnv *env,const char *fileName,const char keyName, const char value) {
  //反射getSharedPreferences获取SharedPreferences对象
  jobject obj_sharedPreferences = getSharedPreferencesNative(env, fileName);
  //反射SharedPreferences
  jclass cls_SharedPreferences = env->FindClass("android/content/SharedPreferences");
  //反射SharedPreferencesEditor");
  //反射edit方法
  jmethodID mid_edit = env->GetMethodID(cls_SharedPreferences,
  "edit", "()Landroid/content/SharedPreferencesEditor;");
  //反射commit方法
  jmethodID mid_commit = env->GetMethodID(cls_SharedPreferencesEditor, "commit", "()Z");
  //执行edit方法
  jobject obj_editor = env->CallObjectMethod(obj_sharedPreferences, mid_edit);
  //参数类型转换
  jstring str_keyLicense = Str2Jstring(env, keyName);
  //参数类型转换
  jstring str_value = Str2Jstring(env, value);
  //执行putString方法
  env->CallObjectMethod(obj_editor, mid_putString, str_keyLicense, str_value);
  //执行commit方法
  jboolean jb_commit = env->CallBooleanMethod(obj_editor, mid_commit);
  //释放内存
  env->DeleteLocalRef(cls_SharedPreferences);
  env->DeleteLocalRef(cls_SharedPreferencesEditor);
  env->DeleteLocalRef(obj_sharedPreferences);
  env->DeleteLocalRef(obj_editor);
  env->DeleteLocalRef(str_keyLicense);
  env->DeleteLocalRef(str_value);
  return jb_commit;
  }
  /
• 读取key值
• @param env
• @param fileName
• @param keyName
• @param defValue
• @return
  */
  jstring getKey(JNIEnv *env,const char *fileName,const char *keyName, const char *defValue) {
  //反射getSharedPreferences获取SharedPreferences对象
  jobject obj_sharedPreferences = getSharedPreferencesNative(env, fileName);
  //反射SharedPreferences类
  jclass cls_SharedPreferences = env->FindClass("android/content/SharedPreferences");
  //反射SharedPreferences类的getString方法
  jmethodID mid_getString = env->GetMethodID(cls_SharedPreferences,
  "getString",
  "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;");
  //参数类型转换
  jstring key_name = env->NewStringUTF(keyName);
  //参数类型转换
  jstring default_value = env->NewStringUTF(defValue);
  //执行反射方法
  jstring str_keyLicenseValue = (jstring) env->CallObjectMethod(obj_sharedPreferences,
  mid_getString, key_name, default_value);
  //释放内存
  env->DeleteLocalRef(obj_sharedPreferences);
  env->DeleteLocalRef(cls_SharedPreferences);
  env->DeleteLocalRef(key_name);
  env->DeleteLocalRef(default_value);
  return str_keyLicenseValue;
  }

/**

• 反射getSharedPreferences获取SharedPreferences对象
• @param env
• @param fileName
• @return
  */
  jstring getPackageNameNative(JNIEnv *env) {
  //反射Context类
  jclass cls_Context = env->FindClass("android/content/Context");
  //反射Context类getPackageName方法
  jmethodID mid_getPackageName = env->GetMethodID(cls_Context,
  "getPackageName",
  "()Ljava/lang/String;");
  //执行反射方法
  jstring packageName =(jstring) env->CallObjectMethod(getApplication(env),
  mid_getPackageName);
  //释放内存
  env->DeleteLocalRef(cls_Context);
  return packageName;
  }

demo地址：https://github.com/ApeCold/JniSharePreference