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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 } }}