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, "長按不放可以拖動！", Toast.LENGTH_SHORT).show();        if (viewHolder.getLayoutPosition() != 0) {          itemTouchHelper.startDrag(viewHolder);        }      }    });    mRecyclerView.setAdapter(mRecyAdapter);  }  @Override  public boolean onOptionsItemSelected(MenuItem item) {    if (item.getItemId() == android/179203.html">android.R.id.home) {      finish();    }    return super.onOptionsItemSelected(item);  }}

public class DataManager {  private static List<String> sStringList = Arrays.asList("語文", "數學", "英語", "政治",      "歷史", "化學", "生物", "地理", "體育", "音樂");  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;  }}

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, top, right, bottom);      mDivider.draw(c);    }  }  @Override  public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {    outRect.set(0, 0, lineWidth, lineWidth);  }}

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, 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("不許動");      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);    }  }}

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) {  }  //回調事件  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);      }    }  }}

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;  }//  獲取Touch的響應方向  @Override  public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {    if (recyclerView.getLayoutManager() instanceof GridLayoutManager) {//網格布局時候      int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN |          ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;      int swipeFlags = 0;      return makeMovementFlags(dragFlags, swipeFlags);    } else {//list布局時候      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, i - 1);      }    }    //刷新    mAdapter.notifyItemMoved(fromPosition, toPosition);    return true;  }  /**   * 側滑刪除后會回調的方法   */  @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;  }}

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, "碰了一下 " + tvString, Toast.LENGTH_SHORT).show();      }      @Override      public void onLongClick(RecyclerView.ViewHolder viewHolder) {        Toast.makeText(ListViewActivity.this, "長按不放可以拖動！", 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);  }}

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 parent, RecyclerView.State state) {    super.onDraw(c, parent, state);  }  @Override  public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {    super.onDrawOver(c, parent, state);  }  @Override  public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {    if (mOrientation == VERTICAL_LIST) {      outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());    } else {      outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);    }    super.getItemOffsets(outRect, view, parent, state);  }  public void setOrientation(int orientation) {    if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {      throw new IllegalArgumentException("invalid orientaion");    }    mOrientation = orientation;  }}