记录一下项目用到的工具类
import android.content.Context;
import java.lang.reflect.Method;
public class SystemPropertyUtil {
/**
* 根据给定Key获取值.
*
* @return 如果不存在该key则返回空字符串
* @throws IllegalArgumentException
* 如果key超过32个字符则抛出该异常
*/
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");
// 参数类型
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[1];
paramTypes[0] = String.class;
Method get = SystemProperties.getMethod("get", paramTypes);
// 参数
Object[] params = new Object[1];
params[0] = key;
ret = (String) get.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
ret = "";
// TODO
}
return ret;
}
/**
* 根据Key获取值.
*
* @return 如果key不存在, 并且如果def不为空则返回def否则返回空字符串
* @throws IllegalArgumentException
* 如果key超过32个字符则抛出该异常
*/
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");
// 参数类型
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = String.class;
Method get = SystemProperties.getMethod("get", paramTypes);
// 参数
Object[] params = new Object[2];
params[0] = key;
params[1] = def;
ret = (String) get.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
ret = def;
// TODO
}
return ret;
}
/**
* 根据给定的key返回int类型值.
*
* @param key
* 要查询的key
* @param def
* 默认返回值
* @return 返回一个int类型的值, 如果没有发现则返回默认值
* @throws IllegalArgumentException
* 如果key超过32个字符则抛出该异常
*/
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");
// 参数类型
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = int.class;
Method getInt = SystemProperties.getMethod("getInt", paramTypes);
// 参数
Object[] params = new Object[2];
params[0] = 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;
}
/**
* 根据给定的key返回long类型值.
*
* @param key
* 要查询的key
* @param def
* 默认返回值
* @return 返回一个long类型的值, 如果没有发现则返回默认值
* @throws IllegalArgumentException
* 如果key超过32个字符则抛出该异常
*/
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");
// 参数类型
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = long.class;
Method getLong = SystemProperties.getMethod("getLong", paramTypes);
// 参数
Object[] params = new Object[2];
params[0] = 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;
}
/**
* 根据给定的key返回boolean类型值. 如果值为 'n', 'no', '0', 'false' or 'off' 返回false.
* 如果值为'y', 'yes', '1', 'true' or 'on' 返回true. 如果key不存在, 或者是其它的值, 则返回默认值.
*
* @param key
* 要查询的key
* @param def
* 默认返回值
* @return 返回一个boolean类型的值, 如果没有发现则返回默认值
* @throws IllegalArgumentException
* 如果key超过32个字符则抛出该异常
*/
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");
// 参数类型
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = boolean.class;
Method getBoolean = SystemProperties.getMethod("getBoolean", paramTypes);
// 参数
Object[] params = new Object[2];
params[0] = 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;
}
/**
* 根据给定的key和值设置属性, 该方法需要特定的权限才能操作.
*
* @throws IllegalArgumentException
* 如果key超过32个字符则抛出该异常
* @throws IllegalArgumentException
* 如果value超过92个字符则抛出该异常
*/
public static void set(Context context, String key, String val) throws IllegalArgumentException {
try {
@SuppressWarnings("rawtypes")
Class SystemProperties = Class.forName("android.os.SystemProperties");
// 参数类型
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[2];
paramTypes[0] = String.class;
paramTypes[1] = String.class;
Method set = SystemProperties.getMethod("set", paramTypes);
// 参数
Object[] params = new Object[2];
params[0] = key;
params[1] = val;
set.invoke(SystemProperties, params);
} catch (IllegalArgumentException iAE) {
throw iAE;
} catch (Exception e) {
// TODO
}
}
}
