采用发射机制改变滑动块的素材，发射机制滑动素材,try { Fi

采用发射机制改变滑动块的素材，发射机制滑动素材,try { Fi

try {     Field f = AbsListView.class.getDeclaredField("mFastScroller");     f.setAccessible(true);     Object o=f.get(mTrackListView);     Class<?> fastClass = f.getType();    f=fastClass.getDeclaredField("mThumbDrawable");     f.setAccessible(true);     Drawable drawable=(Drawable) f.get(o);     drawable=getResources().getDrawable(R.drawable.clock_background);    f.set(o,drawable);     f = fastClass.getDeclaredField("mThumbW");    f.setAccessible(true);     f.setInt(o, 160);    f = fastClass.getDeclaredField("mThumbH");    f.setAccessible(true);     f.setInt(o, 70);} catch (Exception e) {     throw new RuntimeException(e); }//该片段来自于http://byrx.net