在 recyclerview 上拖放 FAB

问题描述

我正在寻找一种方法，如何像在 todoist 应用程序中一样在列表中拖动 fab：

对于拖放FAB，我有一个继承的类：

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.material.floatingactionbutton.FloatingActionButton;

import org.jetbrains.annotations.NotNull;

public class MovableFloatingActionButton extends FloatingActionButton implements View.OnTouchListener {

    private final static float CLICK_DRAG_TOLERANCE = 10; // Often,there will be a slight,unintentional,drag when the user taps the FAB,so we need to account for this.

    private float downRawX,downRawY;
    private float dX,dY;
    private FabMoveListener moveListener;
    private OnTouchListener l;

    public void setMoveListener(FabMoveListener moveListener) {
        this.moveListener = moveListener;
    }

    public MovableFloatingActionButton(Context context) {
        super(context);
        init();
    }

    public MovableFloatingActionButton(Context context,AttributeSet attrs) {
        super(context,attrs);
        init();
    }

    public MovableFloatingActionButton(Context context,AttributeSet attrs,int defStyleAttr) {
        super(context,attrs,defStyleAttr);
        init();
    }

    private void init() {
        setonTouchListener(this);
    }

    @Override
    public boolean onTouch(@NotNull View view,@NotNull MotionEvent motionEvent) {
        l.onTouch(view,motionEvent);
        moveListener.onEvent(motionEvent);
        ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) view.getLayoutParams();

        int action = motionEvent.getAction();
        if (action == MotionEvent.ACTION_DOWN) {

            downRawX = motionEvent.getRawX();
            downRawY = motionEvent.getRawY();
            dX = view.getX() - downRawX;
            dY = view.getY() - downRawY;

            return true; // Consumed

        } else if (action == MotionEvent.ACTION_MOVE) {

            int viewWidth = view.getWidth();
            int viewHeight = view.getHeight();

            View viewParent = (View) view.getParent();
            int parentWidth = viewParent.getWidth();
            int parentHeight = viewParent.getHeight();

            float newX = motionEvent.getRawX() + dX;
            newX = Math.max(layoutParams.leftMargin,newX); // Don't allow the FAB past the left hand side of the parent
            newX = Math.min(parentWidth - viewWidth - layoutParams.rightMargin,newX); // Don't allow the FAB past the right hand side of the parent

            float newY = motionEvent.getRawY() + dY;
            newY = Math.max(layoutParams.topMargin,newY); // Don't allow the FAB past the top of the parent
            newY = Math.min(parentHeight - viewHeight - layoutParams.bottomMargin,newY); // Don't allow the FAB past the bottom of the parent

            view.animate()
                    .x(newX)
                    .y(newY)
                    .setDuration(0)
                    .start();

            return true; // Consumed

        } else if (action == MotionEvent.ACTION_UP) {

            float upRawX = motionEvent.getRawX();
            float upRawY = motionEvent.getRawY();

            float upDX = upRawX - downRawX;
            float upDY = upRawY - downRawY;

            if (Math.abs(upDX) < CLICK_DRAG_TOLERANCE && Math.abs(upDY) < CLICK_DRAG_TOLERANCE) { // A click
                return performClick();
            } else { // A drag
                return true; // Consumed
            }

        } else {
            return super.onTouchEvent(motionEvent);
        }

    }

    public interface FabMoveListener {
        void onEvent(MotionEvent event);
    }
}

我假设 itemtouchhelper 也用于此目的，但我仍然没有实现类似行为的运气。 实际上，我需要在 itemtouchhelper 中开始拖动并同时拖动一个新的 viewholder 和一个按钮，但是我该怎么做？

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

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