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Android实现RecyclerView侧滑删除和长按拖拽-ItemTouchHelper_android recyclerview itemtouchhelper点击

作者：笔触狂放9 | 2024-03-22 09:04:41

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android recyclerview itemtouchhelper点击
转:http://blog.csdn.net/kaifa1321/article/details/51817621
http://blog.csdn.net/u010687392/article/details/47950199

list_item.xml

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3.     android:layout_width="match_parent"
  4.     android:background="#F9F9F9"
  5.     android:layout_height="40dp">
  6.  
  7.     <TextView
  8.         android:id="@+id/iv_item"
  9.         android:layout_width="match_parent"
  10.         android:layout_height="wrap_content"
  11.         android:layout_centerVertical="true"
  12.         android:gravity="center" />
  13.  
  14.     <ImageView
  15.  
  16.         android:layout_width="match_parent"
  17.         android:layout_height="1dp"
  18.         android:layout_alignParentBottom="true"
  19.         android:background="#88888888" />
  20.  
  21. </RelativeLayout>
adapter
  1. package example.com.itemtouchhelper;
  2.  
  3. import android.content.Context;
  4. import android.support.v7.widget.RecyclerView;
  5. import android.view.LayoutInflater;
  6. import android.view.View;
  7. import android.view.ViewGroup;
  8. import android.widget.TextView;
  9.  
  10. import java.util.List;
  11.  
  12. /**
  13.  * Created by Administrator on 2016/12/6.
  14.  */
  15. public class ListAdapter extends RecyclerView.Adapter<ListAdapter.ViewHolder> {
  16.     private Context context;
  17.     private List<String> datas;
  18.     private final LayoutInflater mInflater;
  19.  
  20.     public ListAdapter(Context context, List<String> datas) {
  21.         this.context = context;
  22.         this.datas = datas;
  23.         mInflater = LayoutInflater.from(context);
  24.  
  25.     }
  26.  
  27.     @Override
  28.     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  29.         return new ViewHolder(mInflater.inflate(R.layout.list_item, parent, false));
  30.     }
  31.  
  32.     @Override
  33.     public void onBindViewHolder(ViewHolder holder, int position) {
  34.         System.out.println("======="+position);
  35.         holder.iv_item.setText(datas.get(position));
  36.     }
  37.  
  38.     @Override
  39.     public int getItemCount() {
  40.         return datas.size();
  41.     }
  42.  
  43.     public static class ViewHolder extends RecyclerView.ViewHolder {
  44.  
  45.         private TextView iv_item;
  46.  
  47.         public ViewHolder(View itemView) {
  48.             super(itemView);
  49.             iv_item = (TextView) itemView.findViewById(R.id.iv_item);
  50.         }
  51.     }
  52. }

mainActivity
  1. //1.设置适配器
  2.         LinearLayoutManager layoutManager = new LinearLayoutManager(this);
  3.         final ListAdapter adapter = new ListAdapter(this, datas);
  4.         recyclerView.setLayoutManager(layoutManager);
  5.         recyclerView.setAdapter(adapter);
  6.  
  7.         //2.设置ItemTouchHelper
  8.         //0则不执行拖动或者滑动
  9.         ItemTouchHelper.SimpleCallback mCallback = new ItemTouchHelper.SimpleCallback(ItemTouchHelper.UP | ItemTouchHelper.DOWN, ItemTouchHelper.RIGHT | ItemTouchHelper.LEFT) {
  10.             @Override
  11.             public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
  12.                 int fromPosition = viewHolder.getAdapterPosition();
  13.                 int toPosition = target.getAdapterPosition();
  14.                 if (fromPosition < toPosition) {
  15.                     //分别把中间所有的item的位置重新交换
  16.                     for (int i = fromPosition; i < toPosition; i++) {
  17.                         Collections.swap(datas, i, i + 1);
  18.                     }
  19.                 } else {
  20.                     //分别把中间所有的item的位置重新交换
  21.                     for (int i = fromPosition; i > toPosition; i--) {
  22.                         Collections.swap(datas, i, i - 1);
  23.                     }
  24.                 }
  25.                 adapter.notifyItemMoved(fromPosition, toPosition);
  26.                 //返回true表示执行拖动
  27.                 return true;
  28.             }
  29.  
  30.             @Override
  31.             public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
  32.                 final int position = viewHolder.getAdapterPosition();
  33.                 new AlertDialog.Builder(MainActivity.this)
  34.                         .setCancelable(false)
  35.                         .setMessage("你确定删除该项吗？")
  36.                         .setNegativeButton("取消", new DialogInterface.OnClickListener() {
  37.                             @Override
  38.                             public void onClick(DialogInterface dialogInterface, int i) {
  39.                                 adapter.notifyDataSetChanged();
  40.                             }
  41.                         })
  42.                         .setPositiveButton("确定", new DialogInterface.OnClickListener() {
  43.                             @Override
  44.                             public void onClick(DialogInterface dialogInterface, int i) {
  45.                                 datas.remove(position);
  46.                                 adapter.notifyDataSetChanged();
  47.                                 Toast.makeText(MainActivity.this, "删除" + position, Toast.LENGTH_SHORT).show();
  48.                             }
  49.                         }).show();
  50.  
  51.             }
  52.  
  53.             @Override
  54.             public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
  55.                 super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
  56.                 final float alpha = 1 - Math.abs(dX) / (float) viewHolder.itemView.getWidth();
  57.                 if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
  58.                     //滑动时改变Item的透明度
  59.  
  60.                     viewHolder.itemView.setAlpha(alpha);
  61.                     viewHolder.itemView.setTranslationX(dX);
  62.                 }
  63.                 //防止item复用出现问题，如果大家不理解下面这段代码，可以自行注释效果，
  64.                 if (alpha <= 0) {
  65.                     viewHolder.itemView.setAlpha(1);
  66.                     viewHolder.itemView.setTranslationX(dX);
  67.  
  68.                 }
  69.             }
  70.  
  71.             @Override
  72.             public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
  73.                 super.onSelectedChanged(viewHolder, actionState);
  74.                 //当选中Item时候会调用该方法，重写此方法可以实现选中时候的一些动画逻辑
  75.                 Log.v("zxy", "onSelectedChanged");
  76.             }
  77.  
  78.             @Override
  79.             public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
  80.                 super.clearView(recyclerView, viewHolder);
  81.                 //当动画已经结束的时候调用该方法，重写此方法可以实现恢复Item的初始状态 
  82.                 Log.v("zxy", "clearView");
  83.             }
  84.         };
  85.         new ItemTouchHelper(mCallback).attachToRecyclerView(recyclerView);
  86.  
  87.  
  88.     }
SimpleCallback构造方法需要我们传入两个参数：
1、dragDirs - 表示拖拽的方向，有六个类型的值：LEFT、RIGHT、START、END、UP、DOWN 
2、swipeDirs - 表示滑动的方向，有六个类型的值：LEFT、RIGHT、START、END、UP、DOWN 
【注】：如果为0，则表示不触发该操作（滑动or拖拽）
然后onMove和onSwiped分别是拖拽和滑动时回调的方法

=====================
temTouchHelper简单使用
要想通过ItemTouchHelper实现交互动画，只需要以下步骤：

 
 
  1. 定义一个ItemTouchHelper.Callback回调类，用于实现具体交互效果
  2. 创建一个ItemTouchHelper对象，并传入Callback对象
  3. 调用ItemTouchHelper对象的attachToRecyclerView方法，将ItemTouchHelper对象绑定到指定RecyclerView控件上。
代码如下：
  1. public class MainActivity extends AppCompatActivity {
  2.  
  3.     @Override
  4.     protected void onCreate(Bundle savedInstanceState) {
  5.         super.onCreate(savedInstanceState);
  6.         setContentView(R.layout.activity_main);
  7.         final List<String> datas = new ArrayList<>();
  8.         for (int i = 0; i < 20; i++) {
  9.             datas.add(String.valueOf(i));
  10.         }
  11.         RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
  12.         
  13.         //1.设置适配器
  14.         LinearLayoutManager layoutManager = new LinearLayoutManager(this);
  15.         RecycleViewAdapter adapter = new RecycleViewAdapter(this, datas);
  16.         recyclerView.setLayoutManager(layoutManager);
  17.         recyclerView.setAdapter(adapter);
  18.         
  19.         //2.设置ItemTouchHelper
  20.         ItemTouchHelper.Callback callback = new MyItemTouchHelperCallback(adapter);
  21.         ItemTouchHelper itemTouchHelper = new ItemTouchHelper(callback);
  22.         itemTouchHelper.attachToRecyclerView(recyclerView);
  23. 	}
  24. }
adpater
  1. package example.com.itemtouchhelper;
  2.  
  3. import android.content.Context;
  4. import android.support.v7.widget.RecyclerView;
  5. import android.view.LayoutInflater;
  6. import android.view.View;
  7. import android.view.ViewGroup;
  8. import android.widget.TextView;
  9.  
  10. import java.util.Collections;
  11. import java.util.List;
  12.  
  13. /**
  14.  * Created by Administrator on 2016/12/6.
  15.  */
  16. public class RecycleViewAdapter extends RecyclerView.Adapter<RecycleViewAdapter.ViewHolder> implements ItemTouchMoveListener {
  17.     private Context context;
  18.     private List<String> datas;
  19.     private final LayoutInflater mInflater;
  20.  
  21.     public RecycleViewAdapter(Context context, List<String> datas) {
  22.         this.context = context;
  23.         this.datas = datas;
  24.         mInflater = LayoutInflater.from(context);
  25.  
  26.     }
  27.  
  28.     @Override
  29.     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  30.         return new ViewHolder(mInflater.inflate(R.layout.list_item, parent, false));
  31.     }
  32.  
  33.     @Override
  34.     public void onBindViewHolder(ViewHolder holder, int position) {
  35.         System.out.println("=======" + position);
  36.         holder.iv_item.setText(datas.get(position));
  37.     }
  38.  
  39.     @Override
  40.     public int getItemCount() {
  41.         return datas.size();
  42.     }
  43.  
  44.  
  45.     public static class ViewHolder extends RecyclerView.ViewHolder {
  46.  
  47.         private TextView iv_item;
  48.  
  49.         public ViewHolder(View itemView) {
  50.             super(itemView);
  51.             iv_item = (TextView) itemView.findViewById(R.id.iv_item);
  52.         }
  53.     }
  54.  
  55.     /**
  56.      * 当Item上下拖动会调用该方法
  57.      *
  58.      * @param fromPosition
  59.      * @param toPosition
  60.      * @return
  61.      */
  62.     @Override
  63.     public boolean onItemMove(int fromPosition, int toPosition) {
  64.         Collections.swap(datas, fromPosition, toPosition);
  65.         notifyItemMoved(fromPosition, toPosition);
  66.         return true;
  67.     }
  68.  
  69.     /**
  70.      * 当Item左右滑动时调用该方法
  71.      *
  72.      * @param position
  73.      * @return
  74.      */
  75.     @Override
  76.     public boolean onItemRemove(int position) {
  77.         datas.remove(position);
  78.         notifyItemRemoved(position);
  79.         return true;
  80.     }
  81. }

MyItemTouchHelperCallback
  1. package example.com.itemtouchhelper;
  2.  
  3. import android.graphics.Canvas;
  4. import android.graphics.Color;
  5. import android.support.v7.widget.RecyclerView;
  6. import android.support.v7.widget.helper.ItemTouchHelper;
  7.  
  8. /**
  9.  * Created by Administrator on 2016/12/6.
  10.  */
  11. public class MyItemTouchHelperCallback extends ItemTouchHelper.Callback {
  12.     private ItemTouchMoveListener mItemTouchMoveListener;
  13.  
  14.     public MyItemTouchHelperCallback(ItemTouchMoveListener listener) {
  15.         this.mItemTouchMoveListener = listener;
  16.     }
  17.  
  18.     /**
  19.      * 设置RecyclerView支持拖动和滑动的方向
  20.      */
  21.     @Override
  22.     public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
  23.  
  24.         //支持上下拖动
  25.         int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
  26.  
  27.         //支持左右滑动
  28.         int swipeFlag = ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
  29.  
  30.         int flags = makeMovementFlags(dragFlags, swipeFlag);
  31.         return flags;
  32.     }
  33.  
  34.     /**
  35.      * 当上下拖动的时候调用该方法
  36.      */
  37.     @Override
  38.     public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
  39.         if (viewHolder.getItemViewType() != target.getItemViewType()) {
  40.             // 当item的类型不一样的时候不能交换
  41.             return false;
  42.         }
  43.  
  44.         boolean result = mItemTouchMoveListener.onItemMove(viewHolder.getAdapterPosition(), target.getAdapterPosition());
  45. //        boolean result = mItemTouchMoveListener.onItemMove(viewHolder.getLayoutPosition(), target.getLayoutPosition());
  46.  
  47.         return result;
  48.     }
  49.  
  50.     /**
  51.      * 当左右滑动的时候调用该方法
  52.      */
  53.     @Override
  54.     public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
  55.         mItemTouchMoveListener.onItemRemove(viewHolder.getAdapterPosition());
  56.     }
  57.  
  58.     /**
  59.      * 选中状态改变时监听
  60.      */
  61.     @Override
  62.     public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
  63.         if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
  64.             //不是空闲状态
  65.             viewHolder.itemView.setBackgroundColor(viewHolder.itemView.getContext().getResources().getColor(R.color.colorPrimary));
  66.         }
  67.  
  68.         super.onSelectedChanged(viewHolder, actionState);
  69.     }
  70.  
  71.     /**
  72.      * 恢复item状态
  73.      */
  74.     @Override
  75.     public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
  76.         viewHolder.itemView.setBackgroundColor(Color.parseColor("#F9F9F9"));
  77.         super.clearView(recyclerView, viewHolder);
  78.     }
  79.  
  80.     /**
  81.      * holde ItemView绘制，属性动画
  82.      */
  83.     @Override
  84.     public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
  85.         //在左右滑动时，让item的透明度随着移动而改变，并缩放
  86.         float alpha = 1 - Math.abs(dX) / viewHolder.itemView.getWidth();
  87.         if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
  88.             viewHolder.itemView.setAlpha(alpha);
  89.             viewHolder.itemView.setScaleX(alpha);
  90.             viewHolder.itemView.setScaleY(alpha);
  91.  
  92.         }
  93.         //防止item复用出现问题，如果大家不理解下面这段代码，可以自行注释效果，
  94.         if (alpha <= 0) {
  95.             viewHolder.itemView.setAlpha(1);
  96.             viewHolder.itemView.setScaleX(1);
  97.             viewHolder.itemView.setScaleY(1);
  98.  
  99.         }
  100.         super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
  101.     }
  102. }

  1. package example.com.itemtouchhelper;
  2.  
  3. /**
  4.  * Created by Administrator on 2016/12/6.
  5.  */
  6. public interface ItemTouchMoveListener {
  7.     /**
  8.      * 当Item上下拖动时调用
  9.      */
  10.     boolean onItemMove(int fromPosition, int toPosition);
  11.  
  12.     /**
  13.      * 当item左右滑动时调用
  14.      */
  15.     boolean onItemRemove(int position);
  16. }







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