Android 反射调用SystemProperties
Posted peak wang
tags:
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import java.lang.reflect.Method;
public class SystemProperties
{
public static String get(String key)
{
String ret = null;
try
{
Class<?> clazz = Class.forName("android.os.SystemProperties");
Method mthd = clazz.getMethod("get", new Class[] { String.class });
mthd.setAccessible(true);
Object obj = mthd.invoke(clazz, new Object[] { key });
if (obj != null && obj instanceof String)
{
ret = (String) obj;
}
}
catch (Exception e)
{
e.printStackTrace();
}
return ret;
}
public static String get(String key, String def)
{
String ret = def;
try
{
Class<?> clazz = Class.forName("android.os.SystemProperties");
Method mthd = clazz.getMethod("get", new Class[] { String.class, String.class });
mthd.setAccessible(true);
Object obj = mthd.invoke(clazz, new Object[] { key, def });
if (obj != null && obj instanceof String)
{
ret = (String) obj;
}
}
catch (Exception e)
{
e.printStackTrace();
}
return ret;
}
public static boolean getBoolean(String key, boolean def)
{
boolean ret = def;
try
{
Class<?> clazz = Class.forName("android.os.SystemProperties");
Method mthd = clazz.getMethod("getBoolean", new Class[] { String.class, boolean.class });
mthd.setAccessible(true);
Object obj = mthd.invoke(clazz, new Object[] { key, def });
if (obj != null && obj instanceof Boolean)
{
ret = (Boolean) obj;
}
}
catch (Exception e)
{
e.printStackTrace();
}
return ret;
}
public static int getInt(String key, int def)
{
int ret = def;
try
{
Class<?> clazz = Class.forName("android.os.SystemProperties");
Method mthd = clazz.getMethod("getInt", new Class[] { String.class, int.class });
mthd.setAccessible(true);
Object obj = mthd.invoke(clazz, new Object[] { key, def });
if (obj != null && obj instanceof Integer)
{
ret = (Integer) obj;
}
}
catch (Exception e)
{
e.printStackTrace();
}
return ret;
}
public static long getLong(String key, long def)
{
long ret = def;
try
{
Class<?> clazz = Class.forName("android.os.SystemProperties");
Method mthd = clazz.getMethod("getLong", new Class[] { String.class, long.class });
mthd.setAccessible(true);
Object obj = mthd.invoke(clazz, new Object[] { key, def });
if (obj != null && obj instanceof Long)
{
ret = (Long) obj;
}
}
catch (Exception e)
{
e.printStackTrace();
}
return ret;
}
public static void set(String key, String value)
{
try
{
Class<?> clazz = Class.forName("android.os.SystemProperties");
Method mthd = clazz.getMethod("set", new Class[] { String.class, String.class });
mthd.setAccessible(true);
mthd.invoke(clazz, new Object[] { key, value });
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
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