简书链接:toolbar返回图标修改的几种方法
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getBinding().toolBar.setNavigationIcon((int) R.drawable.ic_menu_back);
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<style name="ToolbarIconColor"  parent="@style/ThemeOverlay.AppCompat.Light">
    <item name="colorControlNormal">@color/white_no_night</item>
</style>
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Drawable upArrow = ContextCompat.getDrawable(this, R.drawable.abc_ic_ab_back_material);
  if(upArrow != null) {
      upArrow.setColorFilter(ContextCompat.getColor(this, R.color.white), PorterDuff.Mode.SRC_ATOP);
      if(getSupportActionBar() != null) {
          getSupportActionBar().setHomeAsUpIndicator(upArrow);
      }