Android中RecyclerView拖拽、侧删功能的实现代码

概述废话不多说，下面展示一下效果。这是GridView主文件实现。publicclassGridViewActivityextendsAppCompatActivity{

废话不多说，下面展示一下效果。

这是GrIDVIEw主文件实现。

public class GrIDVIEwActivity extends AppCompatActivity {  RecyclerVIEw mRecyclerVIEw;  List<String> mStringList;  RecyclerAdapter mRecyAdapter;  @OverrIDe  protected voID onCreate(@Nullable Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_recyclervIEw);    initVIEw();    initRecy();  }  private voID initVIEw() {    getSupportActionbar().setdisplayHomeAsUpEnabled(true);    mRecyclerVIEw = (RecyclerVIEw) findVIEwByID(R.ID.vIEw_recycler);  }  private voID initRecy() {    if (mStringList == null) {      mStringList = new ArrayList<>();    }    mStringList.addAll(DataManager.getData(20 - mStringList.size()));    mRecyAdapter = new RecyclerAdapter(R.layout.item_grIDvIEw,mStringList,true);    mRecyclerVIEw.setLayoutManager(new GrIDLayoutManager(this,4));    mRecyclerVIEw.addItemdecoration(new divIDerGriItemdecoration(this));    mRecyclerVIEw.setHasFixedSize(true);    RecyitemtouchhelperCallback itemtouchhelperCallback = new RecyitemtouchhelperCallback(mRecyAdapter,false,true);    final itemtouchhelper itemtouchhelper = new itemtouchhelper(itemtouchhelperCallback);    itemtouchhelper.attachToRecyclerVIEw(mRecyclerVIEw);    mRecyclerVIEw.addOnItemtouchListener(new OnRecyclerItemClickListener(mRecyclerVIEw) {      @OverrIDe      public voID onItemClick(RecyclerVIEw.VIEwHolder vIEwHolder) {        RecyclerAdapter.VIEwHolder vIEwHolder1 = (RecyclerAdapter.VIEwHolder) vIEwHolder;        String tvString = vIEwHolder1.mTextVIEw.getText().toString();        Toast.makeText(GrIDVIEwActivity.this,"碰了一下 " + tvString,Toast.LENGTH_SHORT).show();      }      @OverrIDe      public voID onLongClick(RecyclerVIEw.VIEwHolder vIEwHolder) {        RecyclerAdapter.VIEwHolder vIEwHolder1 = (RecyclerAdapter.VIEwHolder) vIEwHolder;        String tvString = vIEwHolder1.mTextVIEw.getText().toString();        Toast.makeText(GrIDVIEwActivity.this,"长按不放可以拖动！",Toast.LENGTH_SHORT).show();        if (vIEwHolder.getLayoutposition() != 0) {          itemtouchhelper.startDrag(vIEwHolder);        }      }    });    mRecyclerVIEw.setAdapter(mRecyAdapter);  }  @OverrIDe  public boolean onoptionsItemSelected(MenuItem item) {    if (item.getItemID() == androID.R.ID.home) {      finish();    }    return super.onoptionsItemSelected(item);  }}

代码不难理解，就是activity里面设置一大堆初始化的东西。RecyclerVIEw 初始化，setLayoutManager、addItemdecoration、setHasFixedSize、itemtouchhelper、addOnItemtouchListener、setAdapter。拖拽效果关键代码是itemtouchhelper.startDrag(vIEwHolder)。其他都围绕着它来转。

然后具体看看各个设置。

DataManager

public class DataManager {  private static List<String> sstringList = Arrays.asList("语文","数学","英语","政治","历史","化学","生物","地理","体育","音乐");  public static final List<String> getData(int number) {    List<String> stringList = new ArrayList<>();    for (int i = 0; i < number; i++) {      stringList.add(sstringList.get(i % sstringList.size()));    }    return stringList;  }}

divIDerGriItemdecoration 这个绘画了item的边线

public class divIDerGriItemdecoration extends RecyclerVIEw.Itemdecoration {  private static final int[] ATTRS = new int[]{androID.R.attr.ListdivIDer};  private Drawable mdivIDer;  private int linewidth = 1;  public divIDerGriItemdecoration(GrIDVIEwActivity grIDVIEwActivity) {    final TypedArray array = grIDVIEwActivity.obtainStyledAttributes(ATTRS);    mdivIDer = array.getDrawable(0);    array.recycle();  }  public divIDerGriItemdecoration(int color) {    mdivIDer = new colorDrawable(color);  }  @OverrIDe  public voID onDraw(Canvas c,RecyclerVIEw parent,RecyclerVIEw.State state) {    drawHorizontal(c,parent);    drawVertical(c,parent);  }  private voID drawHorizontal(Canvas c,RecyclerVIEw parent) {    int childCount = parent.getChildCount();    for (int i = 0; i < childCount; i++) {      final VIEw child = parent.getChildAt(i);      final RecyclerVIEw.LayoutParams params = (RecyclerVIEw.LayoutParams) child.getLayoutParams();      final int left = child.getleft() - params.leftmargin;      final int right = child.getRight() + params.rightmargin + linewidth;      final int top = child.getBottom() + params.bottommargin;      final int bottom = top + linewidth;      mdivIDer.setBounds(left,top,right,bottom);      mdivIDer.draw(c);    }  }  private voID drawVertical(Canvas c,RecyclerVIEw parent) {    final int childCount = parent.getChildCount();    for (int i = 0; i < childCount; i++) {      final VIEw child = parent.getChildAt(i);      final RecyclerVIEw.LayoutParams params = (RecyclerVIEw.LayoutParams) child.getLayoutParams();      final int top = child.gettop() - params.topmargin;      final int bottom = child.getBottom() + params.bottommargin;      final int left = child.getRight() + params.rightmargin;      final int right = left + linewidth;      mdivIDer.setBounds(left,bottom);      mdivIDer.draw(c);    }  }  @OverrIDe  public voID getItemOffsets(Rect outRect,VIEw vIEw,RecyclerVIEw.State state) {    outRect.set(0,linewidth,linewidth);  }}

RecyclerAdapter 适配器，和ui建立连接

public class RecyclerAdapter extends RecyclerVIEw.Adapter<RecyclerAdapter.VIEwHolder> {  private int item_layout;  private List<String> mDataList;  private List<Integer> mInts;  private boolean isFirstSpecial;  public RecyclerAdapter(int item_grIDvIEw,List<String> dataList,boolean isFisrtSpecial) {    this(item_grIDvIEw,dataList);    this.isFirstSpecial = isFisrtSpecial;  }  public RecyclerAdapter(int item_grIDvIEw,List<String> dataList) {    this.item_layout = item_grIDvIEw;    this.mDataList = dataList;    mInts = Arrays.asList(R.mipmap.ic_launcher,R.mipmap.ic_launcher,R.mipmap.ic_launcher);  }  @OverrIDe  public VIEwHolder onCreateVIEwHolder(VIEwGroup parent,int vIEwType) {    VIEw vIEw = LayoutInflater.from(parent.getContext()).inflate(item_layout,parent,false);    return new VIEwHolder(vIEw);  }  @OverrIDe  public voID onBindVIEwHolder(VIEwHolder holder,int position) {    String str = mDataList.get(position);    if (isFirstSpecial && position == 0) {      holder.itemVIEw.setBackgroundcolor(color.LTGRAY);      holder.mTextVIEw.setText("不许动");      holder.mImageVIEw.setimageResource(R.mipmap.ic_launcher);    } else {      holder.itemVIEw.setBackgroundcolor(color.WHITE);      holder.mTextVIEw.setText(str);      holder.mImageVIEw.setimageResource(mInts.get(position % mInts.size()));    }  }  @OverrIDe  public int getItemCount() {    return mDataList == null ? 0 : mDataList.size();  }  public List<String> getDataList() {    return mDataList;  }  class VIEwHolder extends RecyclerVIEw.VIEwHolder {    TextVIEw mTextVIEw;    ImageVIEw mImageVIEw;    public VIEwHolder(VIEw itemVIEw) {      super(itemVIEw);      mTextVIEw = itemVIEw.findVIEwByID(R.ID.tv_item);      mImageVIEw = itemVIEw.findVIEwByID(R.ID.img_item);    }  }}

OnRecyclerItemClickListener，点击事件 。我们借用手势工具类GestureDetectorCompat 来 *** 作

public abstract class OnRecyclerItemClickListener implements RecyclerVIEw.OnItemtouchListener{  private GestureDetectorCompat mGestureDetectorCompat;  private RecyclerVIEw mRecyclerVIEw;  public OnRecyclerItemClickListener(RecyclerVIEw mRecyclerVIEw) {    this.mRecyclerVIEw = mRecyclerVIEw;    mGestureDetectorCompat = new GestureDetectorCompat(mRecyclerVIEw.getContext(),new itemtouchhelperGestureListener());  }  @OverrIDe  public boolean onIntercepttouchEvent(RecyclerVIEw rv,MotionEvent e) {    mGestureDetectorCompat.ontouchEvent(e);    return false;  }  @OverrIDe  public voID ontouchEvent(RecyclerVIEw rv,MotionEvent e) {    mGestureDetectorCompat.ontouchEvent(e);  }  @OverrIDe  public voID onRequestdisallowIntercepttouchEvent(boolean disallowIntercept) {  }  //回调事件  public abstract voID onItemClick(RecyclerVIEw.VIEwHolder vIEwHolder);  public abstract voID onLongClick(RecyclerVIEw.VIEwHolder vIEwHolder);  private class itemtouchhelperGestureListener extends GestureDetector.SimpleOnGestureListener {    @OverrIDe    public boolean onSingleTapUp(MotionEvent e) {      VIEw childVIEwUnder = mRecyclerVIEw.findChildVIEwUnder(e.getX(),e.getY());      if (childVIEwUnder != null) {        RecyclerVIEw.VIEwHolder childVIEwHolder = mRecyclerVIEw.getChildVIEwHolder(childVIEwUnder);        onItemClick(childVIEwHolder);      }      return true;    }    @OverrIDe    public voID onLongPress(MotionEvent e) {      VIEw childVIEwUnder = mRecyclerVIEw.findChildVIEwUnder(e.getX(),e.getY());      if (childVIEwUnder != null) {        RecyclerVIEw.VIEwHolder childVIEwHolder = mRecyclerVIEw.getChildVIEwHolder(childVIEwUnder);        onLongClick(childVIEwHolder);      }    }  }}

RecyitemtouchhelperCallback

public class RecyitemtouchhelperCallback extends itemtouchhelper.Callback {  RecyclerVIEw.Adapter mAdapter;  boolean isSwipeEnable;  boolean isFirstDragUnable;  public RecyitemtouchhelperCallback(RecyclerVIEw.Adapter mAdapter) {    this.mAdapter = mAdapter;    isSwipeEnable = true;    isFirstDragUnable = false;  }  public RecyitemtouchhelperCallback(RecyclerVIEw.Adapter mAdapter,boolean isSwipeEnable,boolean isFirstDragUnable) {    this.mAdapter = mAdapter;    this.isSwipeEnable = isSwipeEnable;    this.isFirstDragUnable = isFirstDragUnable;  }//  获取touch的响应方向  @OverrIDe  public int getMovementFlags(RecyclerVIEw recyclerVIEw,RecyclerVIEw.VIEwHolder vIEwHolder) {    if (recyclerVIEw.getLayoutManager() instanceof GrIDLayoutManager) {//网格布局时候      int dragFlags = itemtouchhelper.UP | itemtouchhelper.DOWN |          itemtouchhelper.left | itemtouchhelper.RIGHT;      int swipeFlags = 0;      return makeMovementFlags(dragFlags,swipeFlags);    } else {//List布局时候      int dragFlags = itemtouchhelper.UP | itemtouchhelper.DOWN;      int swipeFlags = itemtouchhelper.START | itemtouchhelper.END;      return makeMovementFlags(dragFlags,swipeFlags);    }  }  @OverrIDe  public boolean onMove(RecyclerVIEw recyclerVIEw,RecyclerVIEw.VIEwHolder vIEwHolder,RecyclerVIEw.VIEwHolder target) {    int fromposition = vIEwHolder.getAdapterposition();    int toposition = target.getAdapterposition();    if (isFirstDragUnable && toposition == 0) {      return false;    }    //重新更新排序    if (fromposition < toposition) {      for (int i = fromposition; i < toposition; i++) {        Collections.swap(((RecyclerAdapter) mAdapter).getDataList(),i,i + 1);      }    } else {      for (int i = fromposition; i > toposition; i--) {        Collections.swap(((RecyclerAdapter) mAdapter).getDataList(),i - 1);      }    }    //刷新    mAdapter.notifyItemmoved(fromposition,toposition);    return true;  }  /**   * 侧滑删除后会回调的方法   */  @OverrIDe  public voID onSwiped(RecyclerVIEw.VIEwHolder vIEwHolder,int direction) {    int adapterposition = vIEwHolder.getAdapterposition();    mAdapter.notifyItemRemoved(adapterposition);    ((RecyclerAdapter)mAdapter).getDataList().remove(adapterposition);  }  @OverrIDe  public voID onSelectedChanged(RecyclerVIEw.VIEwHolder vIEwHolder,int actionState) {    if (actionState != itemtouchhelper.ACTION_STATE_IDLE) {      vIEwHolder.itemVIEw.setBackgroundcolor(color.LTGRAY);    }    super.onSelectedChanged(vIEwHolder,actionState);  }  @OverrIDe  public voID clearVIEw(RecyclerVIEw recyclerVIEw,RecyclerVIEw.VIEwHolder vIEwHolder) {    super.clearVIEw(recyclerVIEw,vIEwHolder);    vIEwHolder.itemVIEw.setBackgroundcolor(color.WHITE);  }  @OverrIDe  public boolean isLongPressDragEnabled() {    return !isFirstDragUnable;  }  @OverrIDe  public boolean isItemVIEwSwipeEnabled() {    return isSwipeEnable;  }}

下面是List的相关设置

同样，ListvIEw也是一顿初始化设置。

public class ListVIEwActivity extends AppCompatActivity {  RecyclerVIEw mRecyclerVIEw;  List<String> mStringList;  RecyclerAdapter mRecyAdapter;  @OverrIDe  protected voID onCreate(@Nullable Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_recyclervIEw);    initVIEw();    initRecy();  }  private voID initRecy() {    if (mStringList == null) {      mStringList = new ArrayList<>();    }    mStringList.addAll(DataManager.getData(15 - mStringList.size()));    mRecyAdapter = new RecyclerAdapter(R.layout.item_ListvIEw,mStringList);    mRecyclerVIEw.setLayoutManager(new linearlayoutmanager(this));    mRecyclerVIEw.addItemdecoration(new divIDerListItemdecoration(this,linearlayoutmanager.VERTICAL));    mRecyclerVIEw.setHasFixedSize(true);    RecyitemtouchhelperCallback itemtouchhelperCallback = new RecyitemtouchhelperCallback(mRecyAdapter);    final itemtouchhelper itemtouchhelper = new itemtouchhelper(itemtouchhelperCallback);    itemtouchhelper.attachToRecyclerVIEw(mRecyclerVIEw);    mRecyclerVIEw.addOnItemtouchListener(new OnRecyclerItemClickListener(mRecyclerVIEw) {      @OverrIDe      public voID onItemClick(RecyclerVIEw.VIEwHolder vIEwHolder) {        RecyclerAdapter.VIEwHolder vIEwHolder1 = (RecyclerAdapter.VIEwHolder) vIEwHolder;        String tvString = vIEwHolder1.mTextVIEw.getText().toString();        Toast.makeText(ListVIEwActivity.this,Toast.LENGTH_SHORT).show();      }      @OverrIDe      public voID onLongClick(RecyclerVIEw.VIEwHolder vIEwHolder) {        Toast.makeText(ListVIEwActivity.this,Toast.LENGTH_SHORT).show();      }    });    mRecyclerVIEw.setAdapter(mRecyAdapter);  }  private voID initVIEw() {    getSupportActionbar().setdisplayHomeAsUpEnabled(true);    mRecyclerVIEw = (RecyclerVIEw) findVIEwByID(R.ID.vIEw_recycler);  }  @OverrIDe  public boolean onoptionsItemSelected(MenuItem item) {    if (item.getItemID() == androID.R.ID.home) {      finish();    }    return super.onoptionsItemSelected(item);  }}

divIDerListItemdecoration

public class divIDerListItemdecoration extends RecyclerVIEw.Itemdecoration {  private static final int[] ATTRS = new int[] {androID.R.attr.ListdivIDer};  public static final int HORIZONTAL_List = linearlayoutmanager.HORIZONTAL;  public static final int VERTICAL_List = linearlayoutmanager.VERTICAL;  private Drawable mdivIDer;  private int mOrIEntation;  public divIDerListItemdecoration() {    super();  }  public divIDerListItemdecoration(Context context,int orIEntation) {    final TypedArray array = context.obtainStyledAttributes(ATTRS);    mdivIDer = array.getDrawable(0);    array.recycle();    this.mOrIEntation = orIEntation;  }  public divIDerListItemdecoration(Context context,int orIEntation,int drawableID) {    mdivIDer = ContextCompat.getDrawable(context,drawableID);    setorIEntation(orIEntation);  }  @OverrIDe  public voID onDraw(Canvas c,RecyclerVIEw.State state) {    super.onDraw(c,state);  }  @OverrIDe  public voID onDrawOver(Canvas c,RecyclerVIEw.State state) {    super.onDrawOver(c,state);  }  @OverrIDe  public voID getItemOffsets(Rect outRect,RecyclerVIEw.State state) {    if (mOrIEntation == VERTICAL_List) {      outRect.set(0,mdivIDer.getIntrinsicHeight());    } else {      outRect.set(0,mdivIDer.getIntrinsicWIDth(),0);    }    super.getItemOffsets(outRect,vIEw,state);  }  public voID setorIEntation(int orIEntation) {    if (orIEntation != HORIZONTAL_List && orIEntation != VERTICAL_List) {      throw new IllegalArgumentException("invalID orIEntaion");    }    mOrIEntation = orIEntation;  }}

源码下载:http://download.csdn.net/download/loongago/9972876

总结

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