效果就是这样，RecyclerView列表可拖拽排序，可删除，可添加；
RecyclerView给我们提供了一个手势器：
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ItemTouchHelper helper = new ItemTouchHelper(new ItemTouchHelper.Callback() { @Override public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { int dragFrlg = 0; if (recyclerView.getLayoutManager() instanceof GridLayoutManager){ dragFrlg = ItemTouchHelper.UP|ItemTouchHelper.DOWN|ItemTouchHelper.LEFT|ItemTouchHelper.RIGHT; }else if(recyclerView.getLayoutManager() instanceof LinearLayoutManager){ dragFrlg = ItemTouchHelper.UP|ItemTouchHelper.DOWN; } return makeMovementFlags(dragFrlg,0); } @Override public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { //滑动事件 下面注释的代码，滑动后数据和条目错乱，被舍弃 // Collections.swap(datas,viewHolder.getAdapterPosition(),target.getAdapterPosition()); // ap.notifyItemMoved(viewHolder.getAdapterPosition(),target.getAdapterPosition()); //得到当拖拽的viewHolder的Position int fromPosition = viewHolder.getAdapterPosition(); //拿到当前拖拽到的item的viewHolder int toPosition = target.getAdapterPosition(); if (fromPosition < toPosition) { for (int i = fromPosition; i < toPosition; i++) { Collections.swap(datas, i, i + 1); } } else { for (int i = fromPosition; i > toPosition; i--) { Collections.swap(datas, i, i - 1); } } ap.notifyItemMoved(fromPosition, toPosition); return true; } @Override public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) { //侧滑删除可以使用； } @Override public boolean isLongPressDragEnabled() { return true; } /** * 长按选中Item的时候开始调用 * 长按高亮 * @param viewHolder * @param actionState */ @Override public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) { if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) { viewHolder.itemView.setBackgroundColor(Color.RED); //获取系统震动服务//震动70毫秒 Vibrator vib = (Vibrator) getSystemService(Service.VIBRATOR_SERVICE); vib.vibrate(70); } super.onSelectedChanged(viewHolder, actionState); } /** * 手指松开的时候还原高亮 * @param recyclerView * @param viewHolder */ @Override public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { super.clearView(recyclerView, viewHolder); viewHolder.itemView.setBackgroundColor(0); ap.notifyDataSetChanged(); //完成拖动后刷新适配器，这样拖动后删除就不会错乱 } }); |
设置给RecyclerView即可：
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helper.attachToRecyclerView(rv); |
下面是完整的代码和Xml布局文件：
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public class MainActivity extends AppCompatActivity implements View.OnClickListener { private final String TAG = this.getClass().getSimpleName(); private List<String> d = Arrays.asList( "A","B","C","D","E","F","G" ,"H","I","J","K","L","M","N" ,"O","P","Q","R","S","T" ,"U","V","W","X","Y","Z"); private RecyclerView rv ; private Ap<String> ap; private List<String> datas; private EditText edAdd; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initData(); rv = findViewById(R.id.rv); edAdd =findViewById(R.id.et_add); rv.setLayoutManager(new GridLayoutManager(this,3)); // rv.setLayoutManager(new LinearLayoutManager(this)); ap = new Ap(this, datas); rv.setAdapter(ap); helper.attachToRecyclerView(rv); findViewById(R.id.tv).setOnClickListener(this); findViewById(R.id.tv_add).setOnClickListener(this); } private void initData() { datas = new ArrayList<>(); // 直接用d操作集合会崩溃，Arrays.asList集合不可增删改；详细可以看我的博客 for (int i = 0; i < d.size(); i++) { datas.add(d.get(i)); } } @Override public void onClick(View view) { switch (view.getId()){ case R.id.tv: for (int i = 0; i < datas.size(); i++) { Log.i(TAG, "onClick: ____"+datas.get(i)); } break; case R.id.tv_add: ap.add(edAdd.getText().toString().trim()); edAdd.setText(null); break; } } class Ap<T> extends RecyclerView.Adapter<Ap.Vh>{ private Context context; public List<T> stringList; public Ap(Context context, List<T> stringList) { this.context = context; this.stringList = stringList; } @Override public Ap.Vh onCreateViewHolder(ViewGroup parent, int viewType) { return new Vh(LayoutInflater.from(context).inflate(R.layout.item_rv,null)); } @Override public void onBindViewHolder(Ap.Vh holder, final int position) { holder.tv.setText(stringList.get(position).toString()); holder.iv.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { remove(position); } }); } @Override public int getItemCount() { return stringList.size(); } public void add(T item){ int position = stringList.size(); stringList.add(item); notifyItemInserted(position); } public void add(int position,T item){ stringList.add(position,item); notifyItemInserted(position); } // public void remove(T item) { // final int position = stringList.indexOf(item); // if (-1 == position) // return; // stringList.remove(item); // notifyItemRemoved(position); // } public void remove(int position) { stringList.remove(position); notifyItemRemoved(position); notifyItemRangeChanged(position,stringList.size()); } class Vh extends RecyclerView.ViewHolder { public Vh(View itemView) { super(itemView); tv = itemView.findViewById(R.id.tv); iv = itemView.findViewById(R.id.iv_delete); } public TextView tv; public ImageView iv; } } ItemTouchHelper helper = new ItemTouchHelper(new ItemTouchHelper.Callback() { @Override public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { int dragFrlg = 0; if (recyclerView.getLayoutManager() instanceof GridLayoutManager){ dragFrlg = ItemTouchHelper.UP|ItemTouchHelper.DOWN|ItemTouchHelper.LEFT|ItemTouchHelper.RIGHT; }else if(recyclerView.getLayoutManager() instanceof LinearLayoutManager){ dragFrlg = ItemTouchHelper.UP|ItemTouchHelper.DOWN; } return makeMovementFlags(dragFrlg,0); } @Override public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { //滑动事件 下面注释的代码，滑动后数据和条目错乱，被舍弃 // Collections.swap(datas,viewHolder.getAdapterPosition(),target.getAdapterPosition()); // ap.notifyItemMoved(viewHolder.getAdapterPosition(),target.getAdapterPosition()); //得到当拖拽的viewHolder的Position int fromPosition = viewHolder.getAdapterPosition(); //拿到当前拖拽到的item的viewHolder int toPosition = target.getAdapterPosition(); if (fromPosition < toPosition) { for (int i = fromPosition; i < toPosition; i++) { Collections.swap(datas, i, i + 1); } } else { for (int i = fromPosition; i > toPosition; i--) { Collections.swap(datas, i, i - 1); } } ap.notifyItemMoved(fromPosition, toPosition); return true; } @Override public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) { //侧滑删除可以使用； } @Override public boolean isLongPressDragEnabled() { return true; } /** * 长按选中Item的时候开始调用 * 长按高亮 * @param viewHolder * @param actionState */ @Override public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) { if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) { viewHolder.itemView.setBackgroundColor(Color.RED); //获取系统震动服务//震动70毫秒 Vibrator vib = (Vibrator) getSystemService(Service.VIBRATOR_SERVICE); vib.vibrate(70); } super.onSelectedChanged(viewHolder, actionState); } /** * 手指松开的时候还原高亮 * @param recyclerView * @param viewHolder */ @Override public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { super.clearView(recyclerView, viewHolder); viewHolder.itemView.setBackgroundColor(0); ap.notifyDataSetChanged(); //完成拖动后刷新适配器，这样拖动后删除就不会错乱 } }); } |
Xml布局文件：
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<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.ccb.pactera.dragrecyclerviewdemo.MainActivity"> <LinearLayout android:id="@+id/ll" android:background="#eeeeee" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="48dp"> <TextView android:layout_width="0dp" android:layout_weight="1" android:layout_height="48dp" android:id="@+id/tv" android:text="查看数据" android:textColor="#fff" android:textSize="16dp" android:gravity="center" android:background="@color/colorAccent" /> <EditText android:id="@+id/et_add" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1"/> <TextView android:layout_width="0dp" android:layout_weight="1" android:layout_height="48dp" android:id="@+id/tv_add" android:text="添加数据" android:textColor="#fff" android:textSize="16dp" android:gravity="center" android:background="#fc1" /> </LinearLayout> <android.support.v7.widget.RecyclerView android:id="@+id/rv" android:layout_below="@id/ll" android:layout_width="match_parent" android:layout_height="match_parent" /> </RelativeLayout> |
RecyclerView的Item：
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<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:background="#f1f1f1" android:layout_height="match_parent"> <RelativeLayout android:layout_width="match_parent" android:background="#fff" android:layout_margin="0.5dp" android:layout_height="match_parent"> <ImageView android:layout_width="match_parent" android:layout_height="50dp" android:src="@mipmap/icon" android:id="@+id/iv" android:layout_marginTop="10dp" /> <TextView android:id="@+id/tv" android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="16dp" android:layout_below="@id/iv" android:gravity="center_horizontal" android:layout_marginBottom="10dp" /> <ImageView android:layout_width="25dp" android:layout_height="25dp" android:layout_alignParentRight="true" android:src="@mipmap/detele" android:id="@+id/iv_delete" /> </RelativeLayout> </RelativeLayout> |
资源链接Github
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_35605213/article/details/80541461
