android反射によるシステム属性の取得SystemProperties

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;
    }
}

//反射によるシステム属性の設定

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();
    }
}