Android学习之ItemTouchHelper实现RecylerView的拖拽以及滑动删除功能
今天在群里见大神们提到控件的拖动以及滑动删除的效果实现,就在网上找了资料ItemTouchHelper学习,并实现其功能。不胜窃喜之至,忍不住跟大家分享一下,如今就对学习过程做下简介。帮助大家实现这样的拖动以及滑动删除效果。
之前了解到要实现以上效果有View.OnDragListener,SwipeToDismiss两种方法。看了下简介之后感觉非常复杂啊,常常依赖于GestureDetectors和onInterceptTouchEvent,各种手势操作,感觉非常萌逼啊。
可是看了Paul Burke写的ItemTouchHelper之后,感觉豁然开朗。在RecyclerView上加入拖动特性有一个非常easy的方法。这种方法仅仅须要ItemTouchHelper一个类,而且它也是Android 兼容包的一部分。它处理好了关于在RecyclerView上加入拖动排序与滑动删除的全部事情,听了是不是非常激动,感觉就跟保姆似的。
话不多说。献上效果图
是不是非常激动,先看我的代码是怎么实现的吧
代码结构图
这里主要是helper包,然后就是recylerview以及其adapter
首先加入依赖
compile 'com.android.support:appcompat-v7:23.2.1' compile 'com.android.support:design:23.1.1'
因为v7包包括RecylerView。所以这么加入依赖也能够
compile 'com.android.support:recyclerview-v7:23.1.1'
为了保险起见也贴上recyclerview的依赖
然后看布局
<?这没啥好讲的。就是加入RecyclerViewxml version="1.0" encoding="utf-8"?
> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="up72.com.testtouchhelper.MainActivity"> <android.support.v7.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="match_parent"/> </RelativeLayout>
RecyclerView item的布局
<TextView android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:layout_marginLeft="@dimen/activity_horizontal_margin" android:textAppearance="?就显示一个textview,显示就不弄那么复杂。大家越easy看懂越好android:attr/textAppearanceMedium" />
package up72.com.testtouchhelper; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.helper.ItemTouchHelper; import java.util.ArrayList; import up72.com.testtouchhelper.helper.OnStartDragListener; import up72.com.testtouchhelper.helper.SimpleItemTouchHelperCallback; public class MainActivity extends AppCompatActivity implements OnStartDragListener{ private RecyclerView recyclerView; private RecyclerViewAdapter adapter; private ItemTouchHelper mItemTouchHelper; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); recyclerView = (RecyclerView) findViewById(R.id.recyclerView); recyclerView.setHasFixedSize(true); recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false)); recyclerView.setAdapter(adapter = new RecyclerViewAdapter(this)); ItemTouchHelper.Callback callback = new SimpleItemTouchHelperCallback(adapter); mItemTouchHelper = new ItemTouchHelper(callback); mItemTouchHelper.attachToRecyclerView(recyclerView); adapter.replaceAll(getDatas()); } @Override public void onStartDrag(RecyclerView.ViewHolder viewHolder) { mItemTouchHelper.startDrag(viewHolder); } private ArrayList<String> getDatas() { ArrayList<String> list = new ArrayList<>(); for (int i = 0; i < 10; i++) { String text = "item" + i; list.add(text); } return list; } }
这里主要填充数据,实现OnStartDragListener接口, mItemTouchHelper.attachToRecyclerView(recyclerView)绑定recyclerView,适配器传递的不是activity的引用。而是OnStartDragListener的。非常easy吧
所以要创建构造方法
private OnStartDragListener mDragStartListener; public RecyclerViewAdapter(OnStartDragListener mDragStartListener) { this.mDragStartListener = mDragStartListener; }
剩下的看看适配器吧,适配器实现implements ItemTouchHelperAdapter方法,重写了onItemMove,onItemDismiss两个方法,分别处理拖动。滑动删除
@Override public boolean onItemMove(int fromPosition, int toPosition) { Collections.swap(dataList, fromPosition, toPosition); notifyItemMoved(fromPosition, toPosition); return true; } @Override public void onItemDismiss(int position) { dataList.remove(position); notifyItemRemoved(position); }
ViewHolder实现ItemTouchHelperViewHolder接口,实现onItemSelected,onItemClear两个方法
@Override public void onItemSelected() { itemView.setBackgroundColor(Color.RED); } @Override public void onItemClear() { itemView.setBackgroundColor(0); }
完整的适配器设置
package up72.com.testtouchhelper; import android.graphics.Color; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import java.util.ArrayList; import java.util.Collections; import up72.com.testtouchhelper.helper.ItemTouchHelperAdapter; import up72.com.testtouchhelper.helper.ItemTouchHelperViewHolder; import up72.com.testtouchhelper.helper.OnStartDragListener; /** * Created by wangchang on 2016/3/25. */ public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.BaseViewHolder> implements ItemTouchHelperAdapter { private ArrayList<String> dataList = new ArrayList<>(); private OnStartDragListener mDragStartListener; public RecyclerViewAdapter(OnStartDragListener mDragStartListener) { this.mDragStartListener = mDragStartListener; } public void replaceAll(ArrayList<String> list) { dataList.clear(); if (list != null) { dataList.addAll(list); } notifyDataSetChanged(); } @Override public RecyclerViewAdapter.BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { return new DemoViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_main, parent, false)); } @Override public void onBindViewHolder(RecyclerViewAdapter.BaseViewHolder holder, int position) { holder.setData(dataList.get(position)); } @Override public int getItemCount() { return dataList!=null?dataList.size():0; } @Override public boolean onItemMove(int fromPosition, int toPosition) { Collections.swap(dataList, fromPosition, toPosition); notifyItemMoved(fromPosition, toPosition); return true; } @Override public void onItemDismiss(int position) { dataList.remove(position); notifyItemRemoved(position); } public class BaseViewHolder extends RecyclerView.ViewHolder { public BaseViewHolder(View itemView) { super(itemView); } void setData(String data){ } } private class DemoViewHolder extends BaseViewHolder implements ItemTouchHelperViewHolder { private TextView tv; public DemoViewHolder(View view) { super(view); tv= (TextView) view.findViewById(R.id.text); } @Override void setData(String data) { super.setData(data); tv.setText(data); } @Override public void onItemSelected() { itemView.setBackgroundColor(Color.RED); } @Override public void onItemClear() { itemView.setBackgroundColor(0); } } }
就这样效果就实现了,最后贴上Paul Burke大神的原文地址。
Drag and Swipe with RecyclerView
英文比較的好的同志们能够更具体的了解一下。
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