SeekBar中 labelFor標籤no resource identifier found...

<SeekBar
                    android:layout_width="200dp"
                    android:layout_height="wrap_content"
                    android:max="100"
                    android:progress="50"
                    android:id="@+id/title_seek_settingCurrentPower_sb"
                    android:indeterminate="false"
                    android:progressDrawable="@drawable/seekbar_new"
                    android:labelFor="79"
                    android:thumb="@drawable/thumb_drawable"
                    android:layout_marginLeft="10dp"
                    android:layout_marginRight="10dp"/>

其中這一行的labelFor編譯報錯

android:labelFor="79"

[main] E:\src\main\res\layout\titlebar.xml:67: error: No resource identifier found for attribute 'labelFor' in package 'android'