RecyclerView项目中的背景选择器

Question

我正在使用RecyclerView下面的代码:

<android.support.v7.widget.RecyclerView
    android:id="@+id/list"
    android:layout_width="320dp"
    android:layout_height="match_parent"/>

和我的清单项目:

<LinearLayout  android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/selector_medium_high">
    <com.basf.suvinil.crie.ui.common.widget.CircleView
        android:id="@+id/circle"
        android:layout_width="22dp"
        android:layout_height="22dp"/>
    <TextView
        android:id="@+id/label"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:minHeight="57.5dp"/>
</LinearLayout>

详细看这部分android:background="@drawable/selector_medium_high"它是一个普通的选择器:

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@color/background_high" android:state_activated="true"/>
    <item android:drawable="@color/background_high" android:state_pressed="true"/>
    <item android:drawable="@color/background_high" android:state_checked="true"/>
    <item android:drawable="@color/background_high" android:state_focused="true"/>
    <item android:drawable="@color/background_medium"/>
</selector>

但是当我运行这段代码时,触摸行时我的背景颜色没有变化....

Answer 1

设置clickable,focusable,focusableInTouchMode以true在所有元素RecyclerView"名单".

Answer 2

添加:

android:background="?android:attr/selectableItemBackground"

在 item.xml

Answer 3

如果这对您没有任何意义,就像它不适合我一样,请使用以下代码:

android:foreground="?android:attr/selectableItemBackground"

诀窍是android:foreground属性......

Answer 4

添加android:background="?android:attr/selectableItemBackground"到my_list_item.xml的根布局似乎为我工作(假设你要默认选择的颜色).

另外,还要确保将根布局的android:layout_width是match_parent,而不是wrap_content确保整行是可选的.

Answer 5

不幸的是,使用可聚焦视图来模拟项目选择并不是一个好的解决方案,因为:

• notifyDataSetChanged调用时焦点丢失
• 当儿童观点可以集中时,焦点是有问题的

我写了一个基础适配器类来自动处理使用RecyclerView的项目选择.只需从中派生适配器并使用state_selected的可绘制状态列表,就像使用列表视图一样.

我有一篇关于它的博客文章,但这里是代码:

public abstract class TrackSelectionAdapter<VH extends TrackSelectionAdapter.ViewHolder> extends RecyclerView.Adapter<VH> {
    // Start with first item selected
    private int focusedItem = 0;

    @Override
    public void onAttachedToRecyclerView(final RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);

        // Handle key up and key down and attempt to move selection
        recyclerView.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                RecyclerView.LayoutManager lm = recyclerView.getLayoutManager();

                // Return false if scrolled to the bounds and allow focus to move off the list
                if (event.getAction() == KeyEvent.ACTION_DOWN) {
                    if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
                        return tryMoveSelection(lm, 1);
                    } else if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {
                        return tryMoveSelection(lm, -1);
                    }
                }

                return false;
            }
        });
    }

    private boolean tryMoveSelection(RecyclerView.LayoutManager lm, int direction) {
        int tryFocusItem = focusedItem + direction;

        // If still within valid bounds, move the selection, notify to redraw, and scroll
        if (tryFocusItem >= 0 && tryFocusItem < getItemCount()) {
            notifyItemChanged(focusedItem);
            focusedItem = tryFocusItem;
            notifyItemChanged(focusedItem);
            lm.scrollToPosition(focusedItem);
            return true;
        }

        return false;
    }

    @Override
    public void onBindViewHolder(VH viewHolder, int i) {
        // Set selected state; use a state list drawable to style the view
        viewHolder.itemView.setSelected(focusedItem == i);
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        public ViewHolder(View itemView) {
            super(itemView);

            // Handle item click and set the selection
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // Redraw the old selection and the new
                    notifyItemChanged(focusedItem);
                    focusedItem = mRecyclerView.getChildPosition(v);
                    notifyItemChanged(focusedItem);
                }
            });
        }
    }
} 

Answer 6

    viewHolder.mRlPrince.setOnTouchListener(new View.OnTouchListener() {
        @Override public boolean onTouch(View v, MotionEvent event) {

            if (event.getAction()==MotionEvent.ACTION_DOWN){
                viewHolder.mRlPrince.setBackgroundColor(Color.parseColor("#f8f8f8"));
            }if (event.getAction()==MotionEvent.ACTION_UP){
                viewHolder.mRlPrince.setBackgroundColor(Color.WHITE);
            }

            return false;
        }
    });