android通过反射来获取系统属性SystemProperties

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private Method getLongMethod = null;private Method getStringMethod = null;private Method getIntMethod = null;private Method getBooleanMethod = null;public long getLong(final String key, final long def) {    try {        if (getLongMethod == null) {            getLongMethod = Class.forName("android.os.SystemProperties").getMethod("getLong", String.class, long.class);        }        return ((Long) getLongMethod.invoke(null, key, def)).longValue();    } catch (Exception e) {        return def;    }}public String getStringMethod(final String key, final String def) {    try {        if (getStringMethod == null) {            getStringMethod = Class.forName("android.os.SystemProperties").getMethod("get", String.class, String.class);        }        return ((String) getStringMethod.invoke(null, key, def)).toString();    } catch (Exception e) {        return def;    }}public int getIntMethod(final String key, final int def) {    try {        if (getIntMethod == null) {            getIntMethod = Class.forName("android.os.SystemProperties")                    .getMethod("getInt", String.class, int.class);        }        return ((Integer) getIntMethod.invoke(null, key, def)).intValue();    } catch (Exception e) {        return def;    }}public boolean getBooleanMethod(final String key, final boolean def) {    try {        if (getBooleanMethod == null) {            getBooleanMethod = Class.forName("android.os.SystemProperties").getMethod("getBoolean", String.class, boolean.class);        }        return ((Boolean) getBooleanMethod.invoke(null, key, def)).booleanValue();    } catch (Exception e) {        return def;    }}

//通过反射设置系统属性

public static void setProperty(String key, String value) {    try {        Class<?> c = Class.forName("android.os.SystemProperties");        Method set = c.getMethod("set", String.class, String.class);        set.invoke(c, key, value );    } catch (Exception e) {        e.printStackTrace();    }}

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