AppbarLayout中Toolbar包含了子view时设置标题颜色

最新推荐文章于 2021-05-26 18:14:30 发布

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最新推荐文章于 2021-05-26 18:14:30 发布

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分类专栏：安卓文章标签： AppBarLayout Android

本文链接：https://blog.youkuaiyun.com/yaosizy/article/details/70231321

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本文介绍了一个自定义的 AppBarTextColorController 类，该类实现了 OnOffsetChangedListener 接口，用于根据 CollapsingToolbarLayout 的折叠状态改变 TextView 的文字颜色。

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public class AppBarTextColorController implements OnOffsetChangedListener {

    private final CollapsingToolbarLayout collapsingLayout;
    private final int expandColor;
    private final int collapseColor;
    private final TextView textView;

    private int textColorType = 0;
    private final int typeExpand = 1;
    private final int typeCollapse = 2;

    public AppBarTextColorController(CollapsingToolbarLayout collapsingLayout, int expandColor, int collapseColor, TextView textView) {
        this.collapsingLayout = collapsingLayout;
        this.expandColor = expandColor;
        this.collapseColor = collapseColor;
        this.textView = textView;
    }


    @Override public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
        LogUtil.d(Contant.DEBUG_LOG, new StringBuilder().append("onOffsetChanged: ").append(textColorType)
                .append(",").append(collapsingLayout.getHeight()).append(",")
                .append(collapsingLayout.getScrimVisibleHeightTrigger())
                .append(", appbar").append(appBarLayout.getHeight()).append(",")
                .append(appBarLayout.getTotalScrollRange()).append(",")
                .append(verticalOffset).toString());
//                collapsingLayout.
        int scrimHeight = collapsingLayout.getHeight() + verticalOffset;
        if (textColorType != typeCollapse && scrimHeight < collapsingLayout.getScrimVisibleHeightTrigger()) {
            textColorType = typeCollapse;
            textView.setTextColor(collapseColor);
        } else if (textColorType != typeExpand && scrimHeight > collapsingLayout.getScrimVisibleHeightTrigger()) {
            textColorType = typeExpand;
            textView.setTextColor(expandColor);
        }
    }
}