代码修改RecyclerView的scrollbar颜色

因为scrollbar是view的私有内部类，所以需要动态修改RecyclerView的scrollbar颜色， 只能通过反射获取scrollbar的drawable，然后用反射着色，亲测可用，代码直接粘贴就可使用。

import android.content.Context; import android.content.res.ColorStateList; import android.graphics.Color; import android.graphics.drawable.Drawable; import android.view.View; import androidx.annotation.NonNull; import androidx.core.graphics.drawable.DrawableCompat; import androidx.recyclerview.widget.RecyclerView; import java.lang.reflect.Field; import java.lang.reflect.Method; public class ScrollBarUtil { public static void tintScrollbarColor(Context context, RecyclerView recyclerView) { try { //通过反射一层层的获取对象，直到获取到进度条 Class<View> clazz = View.class; Method method = clazz.getDeclaredMethod("getScrollCache"); method.setAccessible(true); Object scrollabilityCacheObj = method.invoke(recyclerView); Class<?> scrollabilityCacheClazz = scrollabilityCacheObj.getClass(); Field scrollBarField = scrollabilityCacheClazz.getField("scrollBar"); Object scrollbarObj = scrollBarField.get(scrollabilityCacheObj); Class<?> scrollbarClass = scrollbarObj.getClass(); Field mVerticalThumbField = scrollbarClass.getDeclaredField("mVerticalThumb"); Field mHorizontalThumbField = scrollbarClass.getDeclaredField("mHorizontalThumb"); mVerticalThumbField.setAccessible(true); mHorizontalThumbField.setAccessible(true); Drawable mVerticalThumb = (Drawable) mVerticalThumbField.get(scrollbarObj); Drawable mHorizontalThumb = (Drawable) mHorizontalThumbField.get(scrollbarObj); //对显示的drawable着色 Drawable mVerticalThumbTint = tintDrawable(mVerticalThumb, Color.parseColor("#6694FF")); Drawable mHorizontalThumbTint = tintDrawable(mHorizontalThumb, Color.parseColor("#6694FF")); //设置新的drawable mVerticalThumbField.set(scrollbarObj, mVerticalThumbTint); mHorizontalThumbField.set(scrollbarObj, mHorizontalThumbTint); } catch (Exception e) { e.printStackTrace(); } } public static Drawable tintDrawable(@NonNull Drawable drawable, int color) { Drawable wrappedDrawable = DrawableCompat.wrap(drawable); DrawableCompat.setTint(wrappedDrawable, color); return wrappedDrawable; } public static Drawable tintDrawable(Drawable drawable, ColorStateList colors) { final Drawable wrappedDrawable = DrawableCompat.wrap(drawable); DrawableCompat.setTintList(wrappedDrawable, colors); return wrappedDrawable; } public static int getColorById(Context context, int color) { return context.getResources().getColor(color); } }