如何在协调器父

时间:2017-01-17 14:02:54

标签: android android-recyclerview floating-action-button recyclerview-layout

我有一个带有协调器layout.inside活动的活动,有一个带有Recycler视图和浮动按钮的片段。当Scroll Recycler查看并避免使用fab行为时,我可以显示/隐藏浮动按钮吗?!

活动布局中的

: CoordinatorLayout -----> AppBarLayout ---->工具栏和FrameLayout和底栏视图

片段布局中的

: RelativeLayout ----> Recycler视图和浮动按钮

我想实现Google+主页之类的内容。 我该如何实现这种情况?

临时我使用此解决方案解决了我的问题:

在我的片段中使用接口的活动协调器布局,并使用fab行为显示/隐藏fab ...直到找到更好的解决方案!!!

5 个答案:

答案 0 :(得分:17)

这段代码很好用:

 mRecycler.addOnScrollListener(new RecyclerView.OnScrollListener() {
                @Override
                public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                    if(dy > 0){
                        mFab.hide();
                    } else{
                        mFab.show();
                    }

                    super.onScrolled(recyclerView, dx, dy);
                }
            });

你做不到:

app:layout_anchor="@id/listView"
app:layout_anchorGravity="bottom|end"

here

  

CoordinatorLayout无法内置支持   ListView根据this Google post

答案 1 :(得分:5)

我修改了Leondro的方法,以便FAB在滚动时隐藏,并在滚动停止时显示。

scrollListener = new RecyclerView.OnScrollListener() {  
    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        switch (newState) {
            case RecyclerView.SCROLL_STATE_IDLE:
                fab.show();
                break;
            default:
                fab.hide();
                break;
        }
        super.onScrollStateChanged(recyclerView, newState);
    }
}; 

rv.clearOnScrollListeners();
rv.addOnScrollListener(scrollListener);

答案 2 :(得分:2)

将此添加到 FAB :

app:layout_behavior="@string/hide_bottom_view_on_scroll_behavior"

答案 3 :(得分:0)

这是有效的解决方案:

class HideOnScrollFabBehavior(context: Context?, attrs: AttributeSet?) : FloatingActionButton.Behavior() {

    // changes visibility from GONE to INVISIBLE when fab is hidden because
    // due to CoordinatorLayout.onStartNestedScroll() implementation
    // child view's (here, fab) onStartNestedScroll won't be called anymore
    // because it's visibility is GONE
    private val listener = object : FloatingActionButton.OnVisibilityChangedListener() {
        override fun onHidden(fab: FloatingActionButton?) {
            fab?.visibility = INVISIBLE
        }
    }

    override fun onStartNestedScroll(coordinatorLayout: CoordinatorLayout, child: FloatingActionButton, directTargetChild: View, target: View, axes: Int, type: Int): Boolean {
        return axes == ViewCompat.SCROLL_AXIS_VERTICAL // Ensure we react to vertical scrolling
                || super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, axes, type)
    }

    override fun onNestedScroll(coordinatorLayout: CoordinatorLayout, child: FloatingActionButton, target: View, dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int, dyUnconsumed: Int, type: Int, consumed: IntArray) {
        super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, type, consumed)
        if (!target.canScrollVertically(1) && dyConsumed > 0 && child.visibility == VISIBLE) {
            // hide the FAB when scroll view reached its bottom
            child.hide(listener)
        } else if (dyConsumed < 0 && child.visibility != VISIBLE) {
            // show the FAB on scroll up
            child.show()
        }
    }

}

答案 4 :(得分:0)

Kotlin 中的解决方案

  create1(data): any {
    return this.http.post<number>(baseUrl, data).pipe(map(res => {
      const resInt = +res;
      console.log(resInt);
      return resInt;
    }),
      catchError(error => {
        console.log(error);
        throw error;
      })
    );
  }