如果使用“反射”选项，则可以使用下面的类

package com.etc.etc;

import java.io.File;

import java.lang.reflect.Method;

import android.content.Context;

import dalvik.system.DexFile;

public class SystemPropertiesProxy

{

/**

* This class cannot be instantiated

*/

private SystemPropertiesProxy(){

}

/**

* 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(Context context, String key) throws IllegalArgumentException {

String ret= "";

try{

ClassLoader cl = context.getClassLoader();

@SuppressWarnings("rawtypes")

Class SystemProperties = cl.loadClass("android.os.SystemProperties");

//Parameters Types

@SuppressWarnings("rawtypes")

Class[] paramTypes= new Class[1];

paramTypes[0]= String.class;

Method get = SystemProperties.getMethod("get", paramTypes);

//Parameters

Object[] params= new Object[1];

params[0]= new String(key);

ret= (String) get.invoke(SystemProperties, params);

}catch( IllegalArgumentException iAE ){

throw iAE;

}catch( Exception e ){

ret= "";

//TODO

}

return ret;

}

/**

* Get the value for the given key.

* @return if the key isn't found, return def if it isn't null, or an empty string otherwise

* @throws IllegalArgumentException if the key exceeds 32 characters

*/

public static String get(Context context, String key, String def) throws IllegalArgumentException {

String ret= def;

try{

ClassLoader cl = context.getClassLoader();

@SuppressWarnings("rawtypes")

Class SystemProperties = cl.loadClass("android.os.SystemProperties");

//Parameters Types

@SuppressWarnings("rawtypes")

Class[] paramTypes= new Class[2];

paramTypes[0]= String.class;

paramTypes[1]= String.class;

Method get = SystemProperties.getMethod("get", paramTypes);

//Parameters

Object[] params= new Object[2];

params[0]= new String(key);

params[1]= new String(def);

ret= (String) get.invoke(SystemProperties, params);

}catch( IllegalArgumentException iAE ){

throw iAE;

}catch( Exception e ){

ret= def;

//TODO

}

return ret;

}

/**

* Get the value for the given key, and return as an integer.

* @param key the key to lookup

* @param def a default value to return

* @return the key parsed as an integer, or def if the key isn't found or

*         cannot be parsed

* @throws IllegalArgumentException if the key exceeds 32 characters

*/

public static Integer getInt(Context context, String key, int def) throws IllegalArgumentException {

Integer ret= def;

try{

ClassLoader cl = context.getClassLoader();

@SuppressWarnings("rawtypes")

Class SystemProperties = cl.loadClass("android.os.SystemProperties");

//Parameters Types

@SuppressWarnings("rawtypes")

Class[] paramTypes= new Class[2];

paramTypes[0]= String.class;

paramTypes[1]= int.class;

Method getInt = SystemProperties.getMethod("getInt", paramTypes);

//Parameters

Object[] params= new Object[2];

params[0]= new String(key);

params[1]= new Integer(def);

ret= (Integer) getInt.invoke(SystemProperties, params);

}catch( IllegalArgumentException iAE ){

throw iAE;

}catch( Exception e ){

ret= def;

//TODO

}

return ret;

}

/**

* Get the value for the given key, and return as a long.

* @param key the key to lookup

* @param def a default value to return

* @return the key parsed as a long, or def if the key isn't found or

*         cannot be parsed

* @throws IllegalArgumentException if the key exceeds 32 characters

*/

public static Long getLong(Context context, String key, long def) throws IllegalArgumentException {

Long ret= def;

try{

ClassLoader cl = context.getClassLoader();

@SuppressWarnings("rawtypes")

Class SystemProperties= cl.loadClass("android.os.SystemProperties");

//Parameters Types

@SuppressWarnings("rawtypes")

Class[] paramTypes= new Class[2];

paramTypes[0]= String.class;

paramTypes[1]= long.class;

Method getLong = SystemProperties.getMethod("getLong", paramTypes);

//Parameters

Object[] params= new Object[2];

params[0]= new String(key);

params[1]= new Long(def);

ret= (Long) getLong.invoke(SystemProperties, params);

}catch( IllegalArgumentException iAE ){

throw iAE;

}catch( Exception e ){

ret= def;

//TODO

}

return ret;

}

/**

* Get the value for the given key, returned as a boolean.

* Values 'n', 'no', '0', 'false' or 'off' are considered false.

* Values 'y', 'yes', '1', 'true' or 'on' are considered true.

* (case insensitive).

* If the key does not exist, or has any other value, then the default

* result is returned.

* @param key the key to lookup

* @param def a default value to return

* @return the key parsed as a boolean, or def if the key isn't found or is

*         not able to be parsed as a boolean.

* @throws IllegalArgumentException if the key exceeds 32 characters

*/

public static Boolean getBoolean(Context context, String key, boolean def) throws IllegalArgumentException {

Boolean ret= def;

try{

ClassLoader cl = context.getClassLoader();

@SuppressWarnings("rawtypes")

Class SystemProperties = cl.loadClass("android.os.SystemProperties");

//Parameters Types

@SuppressWarnings("rawtypes")

Class[] paramTypes= new Class[2];

paramTypes[0]= String.class;

paramTypes[1]= boolean.class;

Method getBoolean = SystemProperties.getMethod("getBoolean", paramTypes);

//Parameters

Object[] params= new Object[2];

params[0]= new String(key);

params[1]= new Boolean(def);

ret= (Boolean) getBoolean.invoke(SystemProperties, params);

}catch( IllegalArgumentException iAE ){

throw iAE;

}catch( Exception e ){

ret= def;

//TODO

}

return ret;

}

/**

* Set the value for the given key.

* @throws IllegalArgumentException if the key exceeds 32 characters

* @throws IllegalArgumentException if the value exceeds 92 characters

*/

public static void set(Context context, String key, String val) throws IllegalArgumentException {

try{

@SuppressWarnings("unused")

DexFile df = new DexFile(new File("/system/app/Settings.apk"));

@SuppressWarnings("unused")

ClassLoader cl = context.getClassLoader();

@SuppressWarnings("rawtypes")

Class SystemProperties = Class.forName("android.os.SystemProperties");

//Parameters Types

@SuppressWarnings("rawtypes")

Class[] paramTypes= new Class[2];

paramTypes[0]= String.class;

paramTypes[1]= String.class;

Method set = SystemProperties.getMethod("set", paramTypes);

//Parameters

Object[] params= new Object[2];

params[0]= new String(key);

params[1]= new String(val);

set.invoke(SystemProperties, params);

}catch( IllegalArgumentException iAE ){

throw iAE;

}catch( Exception e ){

//TODO

}

}

}