详解Android使用CoordinatorLayout+AppBarLayout+CollapsingToolbarLayou实现手指滑动效果

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 /**
   * 获取控件信息
   */
 private void initView() {
    FragmentOntstfAppBar= (AppBarLayout) view.findViewById(R.id.Fragment_ontstf_AppBar);
    FragmentOntstfToolbar= (Toolbar) view.findViewById(R.id.Fragment_ontstf_Toolbar);
    FragmentOntstfPortrait= (CircleImageView) view.findViewById(R.id.Fragment_ontstf_portrait);
    FragmentOntstfName= (TextView) view.findViewById(R.id.Fragment_ontstf_name);
    FragmentOntstfIntroduce= (TextView) view.findViewById(R.id.Fragment_ontstf_introduce);
    FragmentOntstfCollapsingToolbarLayout= (CollapsingToolbarLayout) view.findViewById(R.id.Fragment_ontstf_CollapsingToolbarLayout);
    FragmentOntstfSet= (ImageView) view.findViewById(R.id.Fragment_ontstf_set);
    FragmentOntstfMessage= (ImageView) view.findViewById(R.id.Fragment_ontstf_message);
    FragmentOntstfRecyclerView= (RecyclerView) view.findViewById(R.id.Fragment_ontstf_RecyclerView);
    FragmentOntstfCoordinatorLayout= (CoordinatorLayout) view.findViewById(R.id.Fragment_ontstf_CoordinatorLayout);
    FragmentOntstfRelativeLayout= (RelativeLayout) view.findViewById(R.id.Fragment_ontstf_RelativeLayout);
    setFragmentOntstfRecyclerView();
    AppBar();
    mPresenter.PselectUser(Userid);
  }

  /**
   * 最主要的代码
   * AppBar滑动效果
   */
  private void AppBar() {
    FragmentOntstfAppBar.setExpanded(true);
    FragmentOntstfAppBar.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
      @Override
      public void onOffsetChanged(AppBarLayout appBarLayout, int i) {
        float alpha = (float) Math.abs(i) / appBarLayout.getTotalScrollRange();
        if (alpha == 0) {
          CollapsingToolbarLayout.LayoutParams layoutParams = new CollapsingToolbarLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
          FragmentOntstfRecyclerView.setPadding(0,FragmentOntstfToolbar.getHeight() / 2,0,0);
          layoutParams.setMargins(0, 0, 0, (-FragmentOntstfToolbar.getHeight() / 2));
          layoutParams.gravity = Gravity.BOTTOM;
          FragmentOntstfToolbar.setLayoutParams(layoutParams);
          FragmentOntstfCoordinatorLayout.setClipChildren(false);
        } else if (FragmentOntstfRelativeLayout.getHeight() - Math.abs(i * 1.0f) == FragmentOntstfToolbar.getHeight()) {
          FragmentOntstfCoordinatorLayout.setClipChildren(true);
        } else {
          int a = (int) ((FragmentOntstfToolbar.getHeight() / 2) * alpha);
          CollapsingToolbarLayout.LayoutParams layoutParams = new CollapsingToolbarLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
          FragmentOntstfRecyclerView.setPadding(0,FragmentOntstfToolbar.getHeight() / 2 - a,0,0);
          layoutParams.setMargins(0, 0, 0, -(FragmentOntstfToolbar.getHeight() / 2) - (-a));
          layoutParams.gravity = Gravity.BOTTOM;
          FragmentOntstfToolbar.setLayoutParams(layoutParams);
          FragmentOntstfCoordinatorLayout.setClipChildren(false);
        }
      }
    });
  }