进度条拖动按钮的上下位置

<SeekBar android:id="@+id/seekbar" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginRight="80dp" android:layout_toRightOf="@id/currentTime" android:maxHeight="40dp" android:minHeight="40dp" android:progressDrawable="@drawable/player_setting_bright_progressbar" android:thumb="@drawable/seekbar_button" android:thumbOffset="0dp" />

android:max
android:min

android:thumbOffset="0dp"