折叠工具栏 - 禁用触摸滚动

Question

我想禁用折叠工具栏的触摸行为滚动.如果由RecyclerView(正在工作)触发,它应该只是折叠.我想为什么不只是禁用焦点... android:focusableInTouchMode="false" 但它不起作用.我可以改变layout_scrollFlags但是然后...我的问题是,有一个简单的解决方案吗？

XML:

<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/mCollapsingToolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:minHeight="@dimen/header_size"
            android:fitsSystemWindows="true"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <ImageView
                ...
                app:layout_collapseMode="parallax"/>

            <android.support.v7.widget.Toolbar
                android:id="@+id/mToolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin" />

        </android.support.design.widget.CollapsingToolbarLayout>

    </android.support.design.widget.AppBarLayout>

    <android.support.v7.widget.RecyclerView
        ...
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

</android.support.design.widget.CoordinatorLayout>

Answer 1

在这里找到了一个有效的解决方案:https://stackoverflow.com/a/35465719/2033223.所以现在它只是可滚动的,如果recyclerView中有足够的元素.

XML:

<android.support.design.widget.CollapsingToolbarLayout
    android:id="@+id/mCollapsingToolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:minHeight="@dimen/header_size"
    android:fitsSystemWindows="true"
    app:scrimAnimationDuration="300"
    app:contentScrim="?attr/colorPrimary">

活动:

public class MainActivity extends AppCompatActivity {

    private CollapsingToolbarLayout collapsingToolbarLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        collapsingToolbarLayout = 
              (CollapsingToolbarLayout) findViewById(R.id.mCollapsingToolbar);

        final Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                if (rv.canScrollVertically(DOWN) || rv.canScrollVertically(UP)) {
                    controller.enableScroll();
                } else {
                    controller.disableScroll();
                }
            }
        }, 100);
    }

    private void enableScroll() {
        final AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams)
                                  collapsingToolbarLayout.getLayoutParams();
        params.setScrollFlags(
                AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL 
                | AppBarLayout.LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED
        );
        collapsingToolbarLayout.setLayoutParams(params);
    }

    private void disableScroll() {
        final AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams)
                                  collapsingToolbarLayout.getLayoutParams();
        params.setScrollFlags(0);
        collapsingToolbarLayout.setLayoutParams(params);
    }
}

PS: findLastCompletelyVisibleItemPosition()对我来说还不够.但我也用它.(请查看下面的链接) /sf/answers/2202219981/

编辑: 如果要确保设置了正确的滚动状态,请在初始化列表后使用通知/事件(不是定时更新)(查看已更新).否则,它可能会错误地设置滚动标志.