Question

我有一个布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:background="@android:color/black"
android:layout_height="match_parent">
    <RecyclerView
    android:id="@+id/my_recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<ProgressBar
    android:id="@+id/progress_bar"
    android:layout_centerInParent="true"
    android:visibility="gone"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<RelativeLayout
    android:id="@+id/long_press_container"
    android:layout_centerInParent="true"
    android:background="#40000000"
    android:visibility="visible"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

</RelativeLayout>

我想在long_press_container相对布局中长按一个圆圈，但也要在触摸事件发生地点的回收网格视图中获取对象的引用。

public class CircleView extends View {
private float x;
private float y;
private int r;

// setup initial color
private final int paintColor = Color.WHITE;
// defines paint and canvas
private Paint drawPaint;

public CircleView(Context context, float x, float y, int r) {
    super(context);
    setupPaint();
    this.x = x;
    this.y = y;
    this.r = r;
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    canvas.drawCircle(x, y, r, drawPaint);
}

// Setup paint with color and stroke styles
private void setupPaint() {
    drawPaint = new Paint();
    drawPaint.setColor(paintColor);
    drawPaint.setAntiAlias(true);
    drawPaint.setStrokeWidth(3);
    drawPaint.setStyle(Paint.Style.STROKE);
    drawPaint.setStrokeJoin(Paint.Join.ROUND);
    drawPaint.setStrokeCap(Paint.Cap.ROUND);
}}

我试过这个

mMyRecyclerView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent motionEvent) {
            if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
                Timber.e("recycler " + (motionEvent.getX()) + "," + (motionEvent.getY()));
                mRelativeLayout.addView(new CircleView(getContext(), motionEvent.getX(), motionEvent.getY(), 25));
                Timber.e("recycler " + view.getId());
            }
            if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
                mRelativeLayout.removeAllViews();
            }
            return false;
        }
    });

我绘制圆圈，但我无法获得列表视图中该坐标上的项目的引用。有没有办法从回收站视图或适配器获取该对象？

Answer 1

在每个项目的回收者视图的viewHolder上设置触摸侦听器。这样您就可以获得用户触摸的回收者视图项。

Answer 2

在here

的帮助下找到答案

if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
                        mRelativeLayout.addView(new CircleView(getContext(), motionEvent.getX(), motionEvent.getY(), 25));
                        View v = mMyRecyclerView.findChildViewUnder(motionEvent.getX(), motionEvent.getY());
                        Timber.d("position" + mMyRecyclerView.getChildAdapterPosition(v));
                    }
                    if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
                        mRelativeLayout.removeAllViews();
                    }

在这里，您可以获得适配器中项目的位置，然后通过调用适配器列表并传递位置

来获取它

在recycleview上绘制圆圈

2 个答案: