RecyclerView 左滑（仿QQ左滑删除）

一、效果图

二、实现步骤

1.添加依赖库

(Android/Gradle Scripts/build.gradle(Module:app))

compile 'com.android.support:recyclerview-v7:26.+'

/*     版本号与 compile 'com.android.support:appcompat-v7:26.+'，此句版本号为26.+      */

2.RecyclerView布局

（activity_main.xml）

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:background="#EEEEEE"
        android:scrollbars="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:overScrollMode="never" />

</RelativeLayout>

3.设置颜色选择器

(orange_background.xml)

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="true">
        <layer-list >
            <item >
                <shape >
                    <solid android:color="#f49405"/>
                </shape>
            </item>
            <item >
                <shape >
                    <solid android:color="#22000000"/>
                </shape>
            </item>
        </layer-list>
    </item>

    <item >
        <shape >
            <solid android:color="#f49405"/>
        </shape>
    </item>

</selector>

(app/res/drawable/pink_background.xml)

<?xml version="1.0" encoding="utf-8"?>

<!--颜色选择器-->
<selector xmlns:android="http://schemas.android.com/apk/res/android">


    <!--按定“删除”按钮时该按钮显示的颜色：红色-->
    <item android:state_pressed="true">
        <layer-list >
            <item >
                <shape >
                    <solid android:color="#FF0000"/>
                </shape>
            </item>
            <item >
                <shape >
                    <solid android:color="#22000000"/>
                </shape>
            </item>
        </layer-list>
    </item>



    <!--“删除”按钮直接看上去的颜色：粉红色-->
    <item >
        <shape >
            <!--solid 实心，即填充-->
            <solid android:color="#ff0080"/>
        </shape>
    </item>

</selector>

(app/res/drawable/white_background.xml)

<?xml version="1.0" encoding="utf-8"?>

<!--selector 颜色选择器-->
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- state_pressed="true/false"点击。true 表示点击状态下使用，false表示非点击状态下使用。-->
    <item android:state_pressed="true">
        <layer-list >
            <item >
                <shape >
                    <solid android:color="@android:color/white"/>
                </shape>
            </item>
            <item >
                <shape >

                    <!--solid 实心，即填充-->
                    <solid android:color="#22000000"/>
                </shape>
            </item>
        </layer-list>
    </item>


    <item >
        <shape >
            <solid android:color="@android:color/white"/>
        </shape>
    </item>

</selector>

4.item布局

(layout_item.xml)

<?xml version="1.0" encoding="utf-8"?>

<!--item布局，自定义View-->
<com.example.textdemo.LeftSlideView xmlns:android="http://schemas.android.com/apk/res/android"
                                              android:layout_width="match_parent"
                                              android:layout_height="100dp"
                                              android:background="@android:color/white"
                                              android:layout_marginBottom="1dp">


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >


        <!--"设置"，"删除"按钮使用了TextView而不是Button，是因为５.０以上版本使用Button会显示在上层产出错误显示-->
        <TextView
            android:id="@+id/tv_set"
            android:layout_height="106dp"
            android:layout_width="80dp"
            android:gravity="center"
            android:layout_toRightOf="@+id/layout_content"
            android:text="设置"
            android:textSize="25dp"
            android:background="@drawable/orange_background"
            android:textColor="#DDFFFFFF"
            />


        <TextView
            android:id="@+id/tv_delete"
            android:layout_height="match_parent"
            android:layout_width="80dp"
            android:gravity="center"
            android:layout_toRightOf="@+id/tv_set"
            android:text="删 除"
            android:textSize="25dp"
            android:background="@drawable/pink_background"
            android:textColor="#DDFFFFFF"
            />



        <RelativeLayout
            android:id="@+id/layout_content"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <TextView
                android:id="@+id/text"
                android:layout_height="match_parent"
                android:layout_width="match_parent"
                android:textSize="50dp"
                android:textColor="#dde65b05"
                android:background="@drawable/white_background"
                />
        </RelativeLayout>



    </RelativeLayout>
</com.example.textdemo.LeftSlideView>

5.自定义View

(LeftSlideView.java)

/**
* 自定义View,继承水平滚动条
*/
public class LeftSlideView extends HorizontalScrollView {

    private TextView mTextView_Set;//设置按钮

    private TextView mTextView_Delete;//删除按钮

    private int mScrollWidth;//记录滚动条可以滚动的距离

    private Boolean once = false;//在onMeasure中只执行一次的判断

    private Boolean isOpen = false;//记录按钮菜单是否打开，默认关闭false

    private IonSlidingButtonListener mIonSlidingButtonListener;//自定义的接口，用于传达滑动事件等


    /**
    * 1.构造方法
    */
    public LeftSlideView(Context context) {
        super(context, null);
    }

    public LeftSlideView(Context context, AttributeSet attrs) {
        super(context, attrs, 0);
    }

    public LeftSlideView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.setOverScrollMode(OVER_SCROLL_NEVER);
    }


    //2.在onMeasure中先取得作为“设置”、“删除”按钮的TextView
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        if (!once) {
            mTextView_Delete = (TextView) findViewById(com.example.textdemo.R.id.tv_delete);
            mTextView_Set = (TextView) findViewById(com.example.textdemo.R.id.tv_set);
            once = true;
        }
    }


    //3.在onLayout中使Item在每次变更布局大小时回到初始位置，并且获取滚动条的可移动距离
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        if (changed) {
            this.scrollTo(0, 0);

            //获取水平滚动条可以滑动的范围，即右侧“设置”、“删除”按钮的总宽度
            mScrollWidth = mTextView_Delete.getWidth() + mTextView_Set.getWidth();
        }
    }


    //4.滑动监听，按滑动的距离大小控制菜单开关
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        int action = ev.getAction();
        switch (action) {
            case MotionEvent.ACTION_DOWN://按下
            case MotionEvent.ACTION_MOVE://移动
                mIonSlidingButtonListener.onDownOrMove(this);
                break;
            case MotionEvent.ACTION_UP://松开
            case MotionEvent.ACTION_CANCEL:
                changeScrollx();
                return true;
            default:
                break;
        }
        return super.onTouchEvent(ev);
    }


    /**
    * 5.
    * @param l
    * @param t
    * @param oldl
    * @param oldt
    */
    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);

        //改变view的在x轴方向的位置
        mTextView_Set.setTranslationX(1);
    }


    /**
    * 6.按滚动条被拖动距离判断关闭或打开菜单
    * getScrollX()                view的左上角相对于母视图的左上角的X轴偏移量
    * smoothScrollTo(x, y);        参数：相对于ScrollView左上角的位置来说，你要移动的位置
    */
    public void changeScrollx() {
        if (getScrollX() >= (mScrollWidth / 2)) {
            this.smoothScrollTo(mScrollWidth, 0);
            isOpen = true;
            mIonSlidingButtonListener.onMenuIsOpen(this);
        } else {
            this.smoothScrollTo(0, 0);
            isOpen = false;
        }
    }

    /**
    * 7.打开菜单
    */
    public void openMenu() {
        if (isOpen) {
            return;
        }
        this.smoothScrollTo(mScrollWidth, 0);//相对于原来没有滑动的位置x轴方向偏移了mScrollWidth，y轴方向没有变化。
        isOpen = true;
        mIonSlidingButtonListener.onMenuIsOpen(this);
    }

    /**
    * 8.关闭菜单
    */
    public void closeMenu() {
        if (!isOpen) {
            return;
        }
        this.smoothScrollTo(0, 0);//相对于原来没有滑动的位置,x轴方向、y轴方向都没有变化，即回到原来的位置了。
        isOpen = false;
    }


    /**
    * 9.接口定义及注册方法
    */
    public void setSlidingButtonListener(IonSlidingButtonListener listener) {
        mIonSlidingButtonListener = listener;
    }

    public interface IonSlidingButtonListener {

        //该方法在Adapter中实现
        void onMenuIsOpen(View view);//判断菜单是否打开
        void onDownOrMove(LeftSlideView leftSlideView);//滑动或者点击了Item监听
    }

}

6.设置内容布局的宽为屏幕宽度的工具类

（Utils.java）

public class Utils {


    public static int dp2px(Context context, float dp)
    {
        return (int ) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, context.getResources().getDisplayMetrics());
    }

    /**
    * 获得屏幕宽度
    *
    * @param context
    * @return
    */
    public static int getScreenWidth(Context context)
    {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE );
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics( outMetrics);
        return outMetrics .widthPixels ;
    }
}

7.适配器Adapter

(Adapter.java)

public class Adapter extends RecyclerView.Adapter<Adapter.MyViewHolder> implements LeftSlideView.IonSlidingButtonListener {

    private Context mContext;

    private List<String> mDatas = new ArrayList<String>();

    private IonSlidingViewClickListener mIDeleteBtnClickListener;

    private IonSlidingViewClickListener mISetBtnClickListener;

    private LeftSlideView mMenu = null;


    public Adapter(Context context) {

        mContext = context;
        mIDeleteBtnClickListener = (IonSlidingViewClickListener) context;
        mISetBtnClickListener = (IonSlidingViewClickListener) context;

        for (int i = 0; i < 10; i++) {
            mDatas.add(i + "");
        }
    }

    @Override
    public int getItemCount() {
        return mDatas.size();
    }


    @Override
    public void onBindViewHolder(final MyViewHolder holder, int position) {

        holder.textView.setText(mDatas.get(position));

        //设置内容布局的宽为屏幕宽度
        holder.layout_content.getLayoutParams().width = Utils.getScreenWidth(mContext);

        //item正文点击事件
        holder.textView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {

                //判断是否有删除菜单打开
                if (menuIsOpen()) {
                    closeMenu();//关闭菜单
                } else {
                    int n = holder.getLayoutPosition();
                    mIDeleteBtnClickListener.onItemClick(v, n);
                }

            }
        });


        //左滑设置点击事件
        holder.btn_Set.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                int n = holder.getLayoutPosition();
                mISetBtnClickListener.onSetBtnCilck(view, n);
            }
        });


        //左滑删除点击事件
        holder.btn_Delete.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                int n = holder.getLayoutPosition();
                mIDeleteBtnClickListener.onDeleteBtnCilck(view, n);
            }
        });

    }



    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup arg0, int arg1) {

        //获取自定义View的布局（加载item布局）
        View view = LayoutInflater.from(mContext).inflate(R.layout.layout_item, arg0, false);
        MyViewHolder holder = new MyViewHolder(view);

        return holder;
    }


    class MyViewHolder extends RecyclerView.ViewHolder {

        public TextView btn_Set;
        public TextView btn_Delete;
        public TextView textView;
        public ViewGroup layout_content;

        public MyViewHolder(View itemView) {
            super(itemView);

            btn_Set = (TextView) itemView.findViewById(R.id.tv_set);
            btn_Delete = (TextView) itemView.findViewById(R.id.tv_delete);
            textView = (TextView) itemView.findViewById(R.id.text);
            layout_content = (ViewGroup) itemView.findViewById(R.id.layout_content);

            ((LeftSlideView) itemView).setSlidingButtonListener(Adapter.this);
        }
    }


    /**
    * 删除item
    * @param position
    */
    public void removeData(int position) {
        mDatas.remove(position);
        notifyItemRemoved(position);
    }


    /**
    * 删除菜单打开信息接收
    */
    @Override
    public void onMenuIsOpen(View view) {
        mMenu = (LeftSlideView) view;
    }


    /**
    * 滑动或者点击了Item监听
    *
    * @param leftSlideView
    */
    @Override
    public void onDownOrMove(LeftSlideView leftSlideView) {
        if (menuIsOpen()) {
            if (mMenu != leftSlideView) {
                closeMenu();
            }
        }
    }

    /**
    * 关闭菜单
    */
    public void closeMenu() {
        mMenu.closeMenu();
        mMenu = null;

    }

    /**
    * 判断菜单是否打开
    *
    * @return
    */
    public Boolean menuIsOpen() {
        if (mMenu != null) {
            return true;
        }
        return false;
    }


    /**
    * 注册接口的方法：点击事件。在Mactivity.java实现这些方法。
    */
    public interface IonSlidingViewClickListener {
        void onItemClick(View view, int position);//点击item正文

        void onDeleteBtnCilck(View view, int position);//点击“删除”

        void onSetBtnCilck(View view, int position);//点击“设置”
    }
}

8.MainActivity.java

public class MainActivity extends AppCompatActivity implements Adapter.IonSlidingViewClickListener {

    private RecyclerView mRecyclerView;

    private Adapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(com.example.textdemo.R.layout.activity_main);

        mRecyclerView = (RecyclerView) findViewById(com.example.textdemo.R.id.recyclerview);

        //设置布局管理器
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));//设置布局管理器
        mRecyclerView.setAdapter(mAdapter = new Adapter(this));//设置适配器
        mRecyclerView.setItemAnimator(new DefaultItemAnimator());//设置控制Item增删的动画

    }


    /**
    * item正文的点击事件
    *
    * @param view
    * @param position
    */
    @Override
    public void onItemClick(View view, int position) {
        //点击item正文的代码逻辑
    }


    /**
    * item的左滑设置
    *
    * @param view
    * @param position
    */
    @Override
    public void onSetBtnCilck(View view, int position) {

        //“设置”点击事件的代码逻辑
        Toast.makeText(MainActivity.this, "请设置", Toast.LENGTH_LONG).show();
    }


    /**
    * item的左滑删除
    *
    * @param view
    * @param position
    */
    @Override
    public void onDeleteBtnCilck(View view, int position) {
        mAdapter.removeData(position);
    }


}

9.屏蔽多点触控，否则左滑时可以同时左滑多条item。

(app/res/values/styles.xml)

<resources>

    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

        <item name="android:windowEnableSplitTouch" >false </item>
        <item name="android:splitMotionEvents" >false </item>

    </style>

</resources>

来源：CSDN

作者：司城

链接：https://blog.csdn.net/Kate_sicheng/article/details/77601153