[Android][Lollipop]マナーモード設定を取得する ref: http://qiita.com/wasnot/items/1aafb5a9d6598b7f6a67

file0.java

int mode = Settings.Global.getInt(getContext().getContentResolver(),
                        "zen_mode");

file3.java

boolean result = Settings.Global.putInt(getContext().getContentResolver(),
                        "zen_mode", (Integer) value);

Settings.java

        /**
         * Opaque value, changes when persisted zen mode configuration changes.
         *
         * @hide
         */
        public static final String ZEN_MODE_CONFIG_ETAG = "zen_mode_config_etag";