public Method getDeclaredMethod(String name, Class<?>... parameterTypes) throws NoSuchMethodException, SecurityException

public Method getMethod(String name, Class<?>... parameterTypes) throws NoSuchMethodException, SecurityException

public void printInfo(String str, int iNum, double dNum, long i);

getMethod("printInfo", String.class, int.class, double.class, long.class);

public Object invoke(Object obj, Object... args) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException

package android.os;

import java.util.ArrayList;

import android.util.Log;


/**
 * Gives access to the system properties store. The system properties
 * store contains a list of string key-value pairs.
 *
 * {@hide}
 */
public class SystemProperties
{
  // 省略具体实现代码
  /**
 * Get the value for the given key.
 * @return an empty string if the key isn't found
 * @throws IllegalArgumentException if the key exceeds 32 characters
 */
 public static String get(String key) {
  if (key.length() > PROP_NAME_MAX) {
   throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX);
  }
  return native_get(key);
 }
｝

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import android.util.Log;

public class SystemProperties {
 public static String get(String key) {
  String value = "";
  Class<?> cls = null;

  try {
   cls = Class.forName("android.os.SystemProperties");
   Method hideMethod = cls.getMethod("get", String.class);
   Object object = cls.newInstance();
   value = (String) hideMethod.invoke(object, key);
  } catch (ClassNotFoundException e) {
   Log.e("zhengyi.wzy", "get error() ", e);
  } catch (NoSuchMethodException e) {
   Log.e("zhengyi.wzy", "get error() ", e);
  } catch (InstantiationException e) {
   Log.e("zhengyi.wzy", "get error() ", e);
  } catch (IllegalAccessException e) {
   Log.e("zhengyi.wzy", "get error() ", e);
  } catch (IllegalArgumentException e) {
   Log.e("zhengyi.wzy", "get error() ", e);
  } catch (InvocationTargetException e) {
   Log.e("zhengyi.wzy", "get error() ", e);
  }

  return value;
 }

}