RecyclerView实现上下拖动，滑动删除

先上效果图： 

引入第三方的RecyclerView适配器

implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.30'

在MianActivity的布局文件xml中加入RecyclerView控件

<androidx.recyclerview.widget.RecyclerView
        android:id="@+id/main_recycler"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

新建一个item的布局文件item_recycler.xml这里直接贴出代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:gravity="center_vertical"
    android:layout_width="match_parent"
    android:paddingRight="10dp"
    android:paddingLeft="@dimen/dp_10"
    android:layout_height="45dp">
    <ImageView
        android:src="@drawable/login_logo"
        android:layout_width="35dp"
        android:layout_height="35dp"/>
    <RelativeLayout
        android:paddingLeft="10dp"
        android:layout_width="match_parent"
        android:layout_height="45dp">
        <TextView
            android:id="@+id/recyc_title"
            android:text="标题"
            android:textStyle="bold"
            android:textColor="@color/colorPrimary"
            android:textSize="@dimen/sp_14"
            android:layout_centerVertical="true"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <View
            android:layout_alignParentBottom="true"
            android:background="@color/colorBlack"
            android:layout_width="match_parent"
            android:layout_height="1px"/>
    </RelativeLayout>
</LinearLayout>

新建一个适配器类RecyclerAdapter直接贴出适配器的代码

public class RecyclerAdapter extends BaseQuickAdapter<TestEntity, BaseViewHolder>{

    public RecyclerAdapter(int layoutResId, @Nullable List<TestEntity> data) {
        super(layoutResId, data);
    }

    @Override
    protected void convert(BaseViewHolder helper, TestEntity item) {
        helper.setText(R.id.recyc_title,item.getName());
    }
}

新建一个实体类TestEntity

public class TestEntity {
    private String name;

    public TestEntity(String name){
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

MianActivity中添加模拟数据，绑定RecyclerView的适配器

//模拟列表数据
private void initData() {
        list = new ArrayList<>();
        for (int i = 0; i < 20; i++) {
            if(i % 2 == 0){
                list.add(new TestEntity("张三"));
            }else{
                list.add(new TestEntity("李四"));
            }
        }
    }

//绑定适配器
private void initView() {
        mAdapter = new RecyclerAdapter(R.layout.item_recycler,list);
        mainRecycler.setLayoutManager(new LinearLayoutManager(this));
        mainRecycler.setAdapter(mAdapter);
        mAdapter.setOnItemClickListener(new BaseQuickAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(BaseQuickAdapter adapter, View view, int position) {
                Toast.makeText(MainActivity.this, list.get(position).getName(), Toast.LENGTH_SHORT).show();
            }
        });
}

实现到这里可以显示出RecyclerView的列表，发现点击事件没有效果，在drawable新建一个item_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android" android:color="@color/colorBackGround">
    <item android:drawable="@color/colorWhite"/>
</ripple>

然后在item_recycler.xml中使用，最外层LinearLayout的background

 

 接来下实现RecyclerView的上下拖动，以及侧滑删除，新建OpenationData一个接口

public interface OpenationData {
    void onItemMove(int fromPosition,int toPosition);
    void onItemDissmiss(int position);
}

在适配器中implements，贴出适配器的全部代码

public class RecyclerAdapter extends BaseQuickAdapter<TestEntity, BaseViewHolder> implements OpenationData {

    private List<TestEntity> entityList;

    public RecyclerAdapter(int layoutResId, @Nullable List<TestEntity> data) {
        super(layoutResId, data);
        entityList = data;
    }

    @Override
    protected void convert(BaseViewHolder helper, TestEntity item) {
        helper.setText(R.id.recyc_title,item.getName());
    }

    @Override
    public void onItemMove(int fromPosition, int toPosition) {
        //交换位置
        Collections.swap(entityList,fromPosition,toPosition);
        notifyItemMoved(fromPosition,toPosition);
    }

    @Override
    public void onItemDissmiss(int position) {
        //移除数据
        entityList.remove(position);
        notifyItemRemoved(position);
    }
}

最后就是MainActivity中，贴出代码

public class MainActivity extends AppCompatActivity {

    @BindView(R.id.main_recycler)
    RecyclerView mainRecycler;

    private List<TestEntity> list;
    private RecyclerAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        initData();
        initView();
    }

    private void initData() {
        list = new ArrayList<>();
        for (int i = 0; i < 20; i++) {
            if(i % 2 == 0){
                list.add(new TestEntity("张三"));
            }else{
                list.add(new TestEntity("李四"));
            }
        }
    }

    private void initView() {
        mAdapter = new RecyclerAdapter(R.layout.item_recycler,list);
        mainRecycler.setLayoutManager(new LinearLayoutManager(this));
        mainRecycler.setAdapter(mAdapter);
        mAdapter.setOnItemClickListener(new BaseQuickAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(BaseQuickAdapter adapter, View view, int position) {
                Toast.makeText(MainActivity.this, list.get(position).getName(), Toast.LENGTH_SHORT).show();
            }
        });


        ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() {
            @Override
            public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
                //允许上下拖动
                int dragFlags = ItemTouchHelper.UP|ItemTouchHelper.DOWN;
                //只允许从右向左滑动
                int swipeFlags = ItemTouchHelper.LEFT;
                return makeMovementFlags(dragFlags,swipeFlags);
            }

            @Override
            public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
                mAdapter.onItemMove(viewHolder.getAdapterPosition(),target.getAdapterPosition());
                return false;
            }

            @Override
            public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
                mAdapter.onItemDissmiss(viewHolder.getAdapterPosition());
            }
        });

        itemTouchHelper.attachToRecyclerView(mainRecycler);
    }
}