簡單方式實現列表滑動顯示刪除按鈕RecyclerView+HorizontalScrollView

首先定義一個自定義組件：

import android.content.Context;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
/**
 * Created by zhangda on 2018/1/28.
 */

public class MyRecyclerViewItem extends HorizontalScrollView {


    public static boolean isLeft=true;//在左邊

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

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

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

    private int buttonWidth;
    private DisplayMetrics scale;

    private void init() {
        scale = getContext().getResources().getDisplayMetrics();
        buttonWidth = dp2px(100);// 佈局的寬度
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        Log.i(getClass().getSimpleName(), l+"-"+t+"-"+r+"-"+b);

        //調整佈局
        LinearLayout linearLayout= (LinearLayout) getChildAt(0);
        LinearLayout linearLayoutLeft = (LinearLayout) linearLayout.getChildAt(0);
        LinearLayout linearLayoutRight = (LinearLayout) linearLayout.getChildAt(1);
        linearLayout.layout(linearLayout.getLeft(), linearLayout.getTop(), linearLayout.getLeft()+getMeasuredWidth()+ buttonWidth, linearLayout.getBottom());
        linearLayoutLeft.layout(linearLayoutLeft.getLeft(), linearLayoutLeft.getTop(),linearLayoutLeft.getLeft()+getMeasuredWidth(), linearLayoutLeft.getBottom());
        linearLayoutRight.layout(linearLayoutLeft.getLeft()+getMeasuredWidth(), linearLayoutLeft.getTop(), linearLayoutLeft.getLeft()+getMeasuredWidth()+ buttonWidth, linearLayoutLeft.getBottom());

    }


    //恢復狀態
    public void reset(){
        isLeft=true;
        scrollTo(0,0);
    }


    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        if (ev.getAction()== MotionEvent.ACTION_DOWN)
        {
            Log.i(getClass().getSimpleName(), "down");
            return true;
        }
        if (ev.getAction()==MotionEvent.ACTION_CANCEL || ev.getAction()== MotionEvent.ACTION_UP)
        {
            Log.i(getClass().getSimpleName(), "up");
            int range=70;
            if (isLeft)
            {
                if (getScrollX()>range)
                {
                    isLeft=false;
                    smoothScrollTo(buttonWidth, 0);
                }else {
                    smoothScrollTo(0,0);
                }
            }else {
                if (getScrollX()< (buttonWidth-range))
                {
                    isLeft=true;
                    smoothScrollTo(0,0);
                }else {
                    smoothScrollTo(buttonWidth, 0);
                }
            }
            return true;
        }
        Log.i(getClass().getSimpleName(), "end");
        return super.onTouchEvent(ev);
    }


    private int dp2px(float dpValue){
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpValue, scale);
    }

}

RecyclerView 列表佈局代碼：

<android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"

        android:layout_width="match_parent"
        android:layout_height="match_parent" />

對應item佈局代碼：

<?xml version="1.0" encoding="utf-8"?>
<yourpackage.component.MyRecyclerViewItem xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/scroll_item"
    android:scrollbars="none"
    android:focusable="true"
    android:layout_width="match_parent"
    android:layout_height="50dp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="2dp"
        android:orientation="horizontal">

        <LinearLayout
            android:id="@+id/content_layout"
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="50dp">
            <!--內容區域放置佈局-->

            <TextView
                android:id="@+id/item1"
                android:text="魚香肉絲"
                android:textSize="18sp"
                android:gravity="center"
                android:background="@color/colorWhite"
                android:textColor="@color/colorFontColor"
                android:layout_weight="1"
                android:layout_width="match_parent"
                android:layout_height="50dp" />
            <TextView
                android:id="@+id/item2"
                android:text="15:30"
                android:textSize="18sp"
                android:gravity="center"
                android:background="@color/colorWhite"
                android:textColor="@color/colorFontColor"
                android:layout_weight="1"
                android:layout_width="match_parent"
                android:layout_height="50dp" />

        </LinearLayout>

        <LinearLayout
            android:background="@color/colorDelete"
            android:gravity="center"
            android:orientation="vertical"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

            <!--自定義側邊菜單佈局-->

            <TextView
                android:id="@+id/deleteSample"
                android:text="刪除"
                android:textColor="#ffffff"
                android:textSize="22sp"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />

        </LinearLayout>

    </LinearLayout>

</yourpackage.component.MyRecyclerViewItem>

其中item的點擊事件和刪除按鈕的點擊時間在RecyclerView的Adapter的onBindViewHolder方法中來寫，以下：

@Override
        public void onBindViewHolder(final Hodler holder, final int position) {
            holder.item1.setWidth(screenWidth/2);
            holder.item2.setWidth(screenWidth/2);
            holder.deleteSample.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast.makeText(KeepSampleListActivity.this, "刪除："+position, Toast.LENGTH_LONG).show();
                }
            });
            holder.content_layout.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if(holder.recyclerViewItem.isLeft){
                        Intent i = new Intent();
                        i.setClass(KeepSampleListActivity.this, SampleDetailActivity.class);
                        startActivity(i);
                    }else{
                        holder.recyclerViewItem.reset();
                    }
                }
            });

            //恢復狀態
            holder.recyclerViewItem.reset();
        }