ItemTouchHelperActivity.java revision f27b1ffc67228d73326ec3426fef4c9db75cd6fd 
1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.example.android.supportv7.widget.touch;
18
19import android.app.Activity;
20import android.graphics.Canvas;
21import android.os.Bundle;
22import android.support.annotation.NonNull;
23import android.support.annotation.Nullable;
24import android.support.v7.widget.CardView;
25import android.support.v7.widget.LinearLayoutManager;
26import android.support.v7.widget.RecyclerView;
27import android.support.v7.widget.helper.ItemTouchHelper;
28import android.view.LayoutInflater;
29import android.view.View;
30import android.view.ViewGroup;
31import android.widget.Button;
32import android.widget.TextView;
33
34import com.example.android.supportv7.Cheeses;
35import com.example.android.supportv7.R;
36import com.example.android.supportv7.widget.util.ConfigToggle;
37import com.example.android.supportv7.widget.util.ConfigViewHolder;
38
39import java.util.ArrayList;
40import java.util.Arrays;
41import java.util.List;
42
43/**
44 * Sample activity from which ItemTouchHelper demo activities inherit.
45 */
46abstract public class ItemTouchHelperActivity extends Activity {
47
48    public RecyclerView mRecyclerView;
49
50    public ItemTouchAdapter mAdapter;
51
52    public ItemTouchHelper mItemTouchHelper;
53
54    public ItemTouchHelper.Callback mCallback;
55
56    private ConfigToggle[] mConfigToggles;
57
58    @Override
59    public void onCreate(Bundle savedInstanceState) {
60        super.onCreate(savedInstanceState);
61        setContentView(R.layout.activity_item_touch);
62        mRecyclerView = findViewById(R.id.recycler_view);
63        mRecyclerView.setHasFixedSize(true);
64        mAdapter = createAdapter();
65        mRecyclerView.setAdapter(mAdapter);
66        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
67        mItemTouchHelper = createItemTouchHelper();
68        mItemTouchHelper.attachToRecyclerView(mRecyclerView);
69        initToggles();
70    }
71
72    private void initToggles() {
73        mConfigToggles = createConfigToggles();
74        RecyclerView configView = findViewById(R.id.config_recycler_view);
75        configView.setAdapter(new RecyclerView.Adapter<ConfigViewHolder>() {
76            @Override
77            public ConfigViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
78                return new ConfigViewHolder(LayoutInflater.from(parent.getContext())
79                        .inflate(R.layout.config_view_toggle, parent, false));
80            }
81
82            @Override
83            public void onBindViewHolder(ConfigViewHolder holder, int position) {
84                ConfigToggle toggle = mConfigToggles[position];
85                holder.bind(toggle);
86            }
87
88            @Override
89            public int getItemCount() {
90                return mConfigToggles.length;
91            }
92        });
93        configView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL,
94                false));
95        configView.setHasFixedSize(true);
96    }
97
98    abstract ConfigToggle[] createConfigToggles();
99
100    public ItemTouchHelper createItemTouchHelper() {
101        mCallback = createCallback();
102        return new ItemTouchHelper(mCallback);
103    }
104
105    public ItemTouchHelper.Callback createCallback() {
106        return new ItemTouchHelper.Callback() {
107            @Override
108            public int getMovementFlags(@NonNull RecyclerView recyclerView,
109                    @NonNull RecyclerView.ViewHolder viewHolder) {
110                return ItemTouchHelperActivity.this.getMovementFlags(recyclerView, viewHolder);
111            }
112
113            @Override
114            public boolean onMove(@NonNull RecyclerView recyclerView,
115                    @NonNull RecyclerView.ViewHolder viewHolder,
116                    @NonNull RecyclerView.ViewHolder target) {
117                mAdapter.move(viewHolder.getAdapterPosition(), target.getAdapterPosition());
118                return true;
119            }
120
121            @Override
122            public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
123                mAdapter.delete(viewHolder.getAdapterPosition());
124            }
125
126            @Override
127            public void onSelectedChanged(@Nullable RecyclerView.ViewHolder viewHolder,
128                    int actionState) {
129                super.onSelectedChanged(viewHolder, actionState);
130                ItemTouchHelperActivity.this.onSelectedChanged(viewHolder, actionState);
131            }
132
133            @Override
134            public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView,
135                    @NonNull RecyclerView.ViewHolder viewHolder,
136                    float dX, float dY, int actionState, boolean isCurrentlyActive) {
137                if (ItemTouchHelperActivity.this.onChildDraw(c, recyclerView, viewHolder,
138                        dX, dY, actionState, isCurrentlyActive)) {
139                    return;
140                }
141                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState,
142                        isCurrentlyActive);
143            }
144
145            @Override
146            public void onChildDrawOver(@NonNull Canvas c, @NonNull RecyclerView recyclerView,
147                    RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState,
148                    boolean isCurrentlyActive) {
149                if (ItemTouchHelperActivity.this.onChildDrawOver(c, recyclerView, viewHolder,
150                        dX, dY, actionState, isCurrentlyActive)) {
151                    return;
152                }
153                super.onChildDrawOver(c, recyclerView, viewHolder, dX, dY, actionState,
154                        isCurrentlyActive);
155            }
156
157            @Override
158            public boolean isLongPressDragEnabled() {
159                return ItemTouchHelperActivity.this.isLongPressDragEnabled();
160            }
161
162            @Override
163            public boolean isItemViewSwipeEnabled() {
164                return ItemTouchHelperActivity.this.isPointerSwipeEnabled();
165            }
166
167            @Override
168            public void clearView(@NonNull RecyclerView recyclerView,
169                    @NonNull RecyclerView.ViewHolder viewHolder) {
170                super.clearView(recyclerView, viewHolder);
171                ItemTouchHelperActivity.this.clearView(viewHolder);
172            }
173        };
174    }
175
176    /**
177     * @return True if we should NOT call parent
178     */
179    public boolean onChildDraw(Canvas c, RecyclerView recyclerView,
180            RecyclerView.ViewHolder viewHolder,
181            float dX, float dY, int actionState, boolean isCurrentlyActive) {
182        return false;
183    }
184
185    /**
186     * @return True if we should NOT call parent
187     */
188    public boolean onChildDrawOver(Canvas c, RecyclerView recyclerView,
189            RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState,
190            boolean isCurrentlyActive) {
191        return false;
192    }
193
194    public void clearView(RecyclerView.ViewHolder viewHolder) {
195
196    }
197
198    public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
199
200    }
201
202    public boolean isLongPressDragEnabled() {
203        return true;
204    }
205
206    public boolean isPointerSwipeEnabled() {
207        return true;
208    }
209
210    public ItemTouchViewHolder onCreateViewHolder(ViewGroup parent) {
211        return new ItemTouchViewHolder(
212                LayoutInflater.from(parent.getContext())
213                        .inflate(R.layout.touch_item, parent, false));
214    }
215
216    abstract public int getMovementFlags(RecyclerView recyclerView,
217            RecyclerView.ViewHolder viewHolder);
218
219    public ItemTouchAdapter createAdapter() {
220        return new ItemTouchAdapter();
221    }
222
223    public void onBind(ItemTouchViewHolder viewHolder) {
224
225    }
226
227    public void onCreateViewHolder(ItemTouchViewHolder viewHolder) {
228
229    }
230
231    public class ItemTouchViewHolder extends RecyclerView.ViewHolder {
232
233        public final TextView textView;
234
235        public final Button actionButton;
236
237        public final CardView cardView;
238
239        public final View overlay;
240
241        public ItemTouchViewHolder(View itemView) {
242            super(itemView);
243            cardView = (CardView) itemView;
244            textView = (TextView) itemView.findViewById(R.id.text_view);
245            actionButton = (Button) itemView.findViewById(R.id.action_button);
246            overlay = itemView.findViewById(R.id.overlay);
247        }
248    }
249
250    public class ItemTouchAdapter extends RecyclerView.Adapter<ItemTouchViewHolder> {
251
252        private List<String> mItems = new ArrayList<String>();
253
254        public ItemTouchAdapter() {
255            mItems.addAll(Arrays.asList(Cheeses.sCheeseStrings));
256        }
257
258        @Override
259        public ItemTouchViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
260            return ItemTouchHelperActivity.this.onCreateViewHolder(parent);
261        }
262
263        @Override
264        public void onBindViewHolder(ItemTouchViewHolder holder, int position) {
265            holder.textView.setText(mItems.get(position));
266            onBind(holder);
267        }
268
269        public void delete(int position) {
270            mItems.remove(position);
271            notifyItemRemoved(position);
272        }
273
274        public void move(int from, int to) {
275            String prev = mItems.remove(from);
276            mItems.add(to > from ? to - 1 : to, prev);
277            notifyItemMoved(from, to);
278        }
279
280        @Override
281        public int getItemCount() {
282            return mItems.size();
283        }
284    }
285
286
287}
288