Question

下面是我的代码。我可以向右和向左滑动。但问题是，一旦我向左或向右滑动，我就不能再向右或向左滑动以回到初始状态。例如，首先我将有文本视图列表然后如果我向左滑动然后我将得到一个图标，文本视图将消失。所以现在我需要向右滑动以取回textview，那时间图标应该消失。我怎样才能做到这一点？

   public class MainActivity extends AppCompatActivity {
        private ArrayList countries =  new ArrayList<>();
        private DataAdapter adapter;
        private RecyclerView recyclerView;
        private AlertDialog.Builder alertDialog;
        private EditText et_country;
        private int edit_position;
        private View view;
        private boolean add = false;
        private Paint p = new Paint();


        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            initViews();
        }

        private void initViews(){
            recyclerView = (RecyclerView)findViewById(R.id.card_recycler_view);
            recyclerView.setHasFixedSize(true);
            RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
            recyclerView.setLayoutManager(layoutManager);
            adapter = new DataAdapter(countries);
            recyclerView.setAdapter(adapter);
            initSwipe();

        }
        private void initSwipe(){
            final ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT ) {

                @Override
                public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {

                    return true;
                }

                @Override
                public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {

                    int position = viewHolder.getAdapterPosition();
                    if( direction == ItemTouchHelper.RIGHT) {
                        Toast.makeText(MainActivity.this, "right", Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(MainActivity.this, "left", Toast.LENGTH_SHORT).show();
                    }
                }

                @Override
                public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {

                    Bitmap icon;
                    if(actionState == ItemTouchHelper.ACTION_STATE_SWIPE){

                        View itemView = viewHolder.itemView;
                        float height = (float) itemView.getBottom() - (float) itemView.getTop();
                        float width = height / 3;

                        if(dX < 0) {
                            p.setColor(Color.parseColor("#FF0000"));
                            RectF background = new RectF((float) itemView.getRight() + dX, (float) itemView.getTop(),(float) itemView.getRight(), (float) itemView.getBottom());
                            c.drawRect(background,p);
                            icon = BitmapFactory.decodeResource(getResources(), R.drawable.selectedicon);
                            RectF icon_dest = new RectF((float) itemView.getRight() - 2*width ,(float) itemView.getTop() + width,(float) itemView.getRight() - width,(float)itemView.getBottom() - width);
                            c.drawBitmap(icon,null,icon_dest,p);

                        } else {
                        p.setColor(Color.parseColor("#D32F2F"));
                            RectF background = new RectF((float) itemView.getRight() + dX, (float) itemView.getTop(),(float) itemView.getRight(), (float) itemView.getBottom());
                            c.drawRect(background,p);
                            icon = BitmapFactory.decodeResource(getResources(), R.drawable.selectedicon);
                            RectF icon_dest = new RectF((float) itemView.getRight() - 2*width ,(float) itemView.getTop() + width,(float) itemView.getRight() - width,(float)itemView.getBottom() - width);
                            c.drawBitmap(icon,null,icon_dest,p);

                        }
                    }
                    super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
                }
            };

            ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback);
            itemTouchHelper.attachToRecyclerView(recyclerView);


        }


    }

Answer 1

 if(dX < 0) {
                            p.setColor(Color.parseColor("#FF0000"));
                            RectF background = new RectF((float) itemView.getRight() + dX, (float) itemView.getTop(),(float) itemView.getRight(), (float) itemView.getBottom());
                            c.drawRect(background,p);
                            icon = BitmapFactory.decodeResource(getResources(), R.drawable.selectedicon);
                            RectF icon_dest = new RectF((float) itemView.getRight() - 2*width ,(float) itemView.getTop() + width,(float) itemView.getRight() - width,(float)itemView.getBottom() - width);
                            c.drawBitmap(icon,null,icon_dest,p);
                            dX = 0;

                        }

上面的代码适用于向左滑动，然后向右滑动以返回初始状态。

Answer 2

     @Override
                    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {

                        return true;
                    }

    change it to return false

@Override
                    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {

                        return false;
                    }

如何在Android中右键滑动后滑回到初始状态？

2 个答案: