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a guest Jul 20th, 2019 70 Never
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  1.  
  2.         final AppBarLayout mAppBarLayout = (AppBarLayout) findViewById(R.id.appBar);
  3.         mAppBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
  4.             boolean isShow = false;
  5.             int scrollRange = -1;
  6.  
  7.             @Override
  8.             public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
  9.                 if (scrollRange == -1) {
  10.                     scrollRange = appBarLayout.getTotalScrollRange();
  11.                 }
  12.                 if (scrollRange + verticalOffset == 0) {
  13.                     isShow = true;
  14.                     //showOption(R.id.action_info);
  15.                     mTitle.setVisibility(View.VISIBLE);
  16.                     if (fontpackfeature.equals("2")) {
  17.                         Objects.requireNonNull(getSupportActionBar()).setIcon(R.mipmap.wingsgold);
  18.                     } else if (fontpackfeature.equals("3")) {
  19.                         Objects.requireNonNull(getSupportActionBar()).setIcon(R.mipmap.wingswine);
  20.                     } else if (fontpackfeature.equals("4")) {
  21.                         Objects.requireNonNull(getSupportActionBar()).setIcon(R.mipmap.wingsonline);
  22.                     } else {
  23.                         Objects.requireNonNull(getSupportActionBar()).setIcon(R.mipmap.wingsicon);
  24.                     }
  25.                 } else if (isShow) {
  26.                     isShow = false;
  27.                     //hideOption(R.id.action_info);
  28.                     mTitle.setVisibility(View.GONE);
  29.                     Objects.requireNonNull(getSupportActionBar()).setIcon(R.drawable.transparentpng);
  30.                     mAppBarLayout.setExpanded(true, true);
  31.                 }
  32.             }
  33.         });
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