左右滑動刪除ListView條目Item--第三方開源--SwipeToDismiss，第三方listview
Android的SwipeToDismiss是github上一個第三方開源框架（github上的項目鏈接地址：https://github.com/romannurik/Android-SwipeToDismiss ）。
該開源項目旨在：使得一個ListView的item在用戶的手指在屏幕上左滑或者右滑時候，刪除當前的這個ListView Item。
下載下來只需找到其中的SwipeDismissListViewTouchListener.java類，復制粘貼到需要的包中：
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1 /*
2 * Copyright 2013 Google Inc.
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
17 package com.zzw.testswipetodismiss;
18
19 import android.animation.Animator;
20 import android.animation.AnimatorListenerAdapter;
21 import android.animation.ValueAnimator;
22 import android.graphics.Rect;
23 import android.os.SystemClock;
24 import android.view.MotionEvent;
25 import android.view.VelocityTracker;
26 import android.view.View;
27 import android.view.ViewConfiguration;
28 import android.view.ViewGroup;
29 import android.view.ViewPropertyAnimator;
30 import android.widget.AbsListView;
31 import android.widget.ListView;
32
33 import java.util.ArrayList;
34 import java.util.Collections;
35 import java.util.List;
36
37 /**
38 * A {@link View.OnTouchListener} that makes the list items in a {@link ListView}
39 * dismissable. {@link ListView} is given special treatment because by default it handles touches
40 * for its list items... i.e. it's in charge of drawing the pressed state (the list selector),
41 * handling list item clicks, etc.
42 *
43 * <p>After creating the listener, the caller should also call
44 * {@link ListView#setOnScrollListener(AbsListView.OnScrollListener)}, passing
45 * in the scroll listener returned by {@link #makeScrollListener()}. If a scroll listener is
46 * already assigned, the caller should still pass scroll changes through to this listener. This will
47 * ensure that this {@link SwipeDismissListViewTouchListener} is paused during list view
48 * scrolling.</p>
49 *
50 * <p>Example usage:</p>
51 *
52 * <pre>
53 * SwipeDismissListViewTouchListener touchListener =
54 * new SwipeDismissListViewTouchListener(
55 * listView,
56 * new SwipeDismissListViewTouchListener.OnDismissCallback() {
57 * public void onDismiss(ListView listView, int[] reverseSortedPositions) {
58 * for (int position : reverseSortedPositions) {
59 * adapter.remove(adapter.getItem(position));
60 * }
61 * adapter.notifyDataSetChanged();
62 * }
63 * });
64 * listView.setOnTouchListener(touchListener);
65 * listView.setOnScrollListener(touchListener.makeScrollListener());
66 * </pre>
67 *
68 * <p>This class Requires API level 12 or later due to use of {@link
69 * ViewPropertyAnimator}.</p>
70 *
71 * <p>For a generalized {@link View.OnTouchListener} that makes any view dismissable,
72 * see {@link SwipeDismissTouchListener}.</p>
73 *
74 * @see SwipeDismissTouchListener
75 */
76 public class SwipeDismissListViewTouchListener implements View.OnTouchListener {
77 // Cached ViewConfiguration and system-wide constant values
78 private int mSlop;
79 private int mMinFlingVelocity;
80 private int mMaxFlingVelocity;
81 private long mAnimationTime;
82
83 // Fixed properties
84 private ListView mListView;
85 private DismissCallbacks mCallbacks;
86 private int mViewWidth = 1; // 1 and not 0 to prevent dividing by zero
87
88 // Transient properties
89 private List<PendingDismissData> mPendingDismisses = new ArrayList<PendingDismissData>();
90 private int mDismissAnimationRefCount = 0;
91 private float mDownX;
92 private float mDownY;
93 private boolean mSwiping;
94 private int mSwipingSlop;
95 private VelocityTracker mVelocityTracker;
96 private int mDownPosition;
97 private View mDownView;
98 private boolean mPaused;
99
100 /**
101 * The callback interface used by {@link SwipeDismissListViewTouchListener} to inform its client
102 * about a successful dismissal of one or more list item positions.
103 */
104 public interface DismissCallbacks {
105 /**
106 * Called to determine whether the given position can be dismissed.
107 */
108 boolean canDismiss(int position);
109
110 /**
111 * Called when the user has indicated they she would like to dismiss one or more list item
112 * positions.
113 *
114 * @param listView The originating {@link ListView}.
115 * @param reverseSortedPositions An array of positions to dismiss, sorted in descending
116 * order for convenience.
117 */
118 void onDismiss(ListView listView, int[] reverseSortedPositions);
119 }
120
121 /**
122 * Constructs a new swipe-to-dismiss touch listener for the given list view.
123 *
124 * @param listView The list view whose items should be dismissable.
125 * @param callbacks The callback to trigger when the user has indicated that she would like to
126 * dismiss one or more list items.
127 */
128 public SwipeDismissListViewTouchListener(ListView listView, DismissCallbacks callbacks) {
129 ViewConfiguration vc = ViewConfiguration.get(listView.getContext());
130 mSlop = vc.getScaledTouchSlop();
131 mMinFlingVelocity = vc.getScaledMinimumFlingVelocity() * 16;
132 mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity();
133 mAnimationTime = listView.getContext().getResources().getInteger(
134 android.R.integer.config_shortAnimTime);
135 mListView = listView;
136 mCallbacks = callbacks;
137 }
138
139 /**
140 * Enables or disables (pauses or resumes) watching for swipe-to-dismiss gestures.
141 *
142 * @param enabled Whether or not to watch for gestures.
143 */
144 public void setEnabled(boolean enabled) {
145 mPaused = !enabled;
146 }
147
148 /**
149 * Returns an {@link AbsListView.OnScrollListener} to be added to the {@link
150 * ListView} using {@link ListView#setOnScrollListener(AbsListView.OnScrollListener)}.
151 * If a scroll listener is already assigned, the caller should still pass scroll changes through
152 * to this listener. This will ensure that this {@link SwipeDismissListViewTouchListener} is
153 * paused during list view scrolling.</p>
154 *
155 * @see SwipeDismissListViewTouchListener
156 */
157 public AbsListView.OnScrollListener makeScrollListener() {
158 return new AbsListView.OnScrollListener() {
159 @Override
160 public void onScrollStateChanged(AbsListView absListView, int scrollState) {
161 setEnabled(scrollState != AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
162 }
163
164 @Override
165 public void onScroll(AbsListView absListView, int i, int i1, int i2) {
166 }
167 };
168 }
169
170 @Override
171 public boolean onTouch(View view, MotionEvent motionEvent) {
172 if (mViewWidth < 2) {
173 mViewWidth = mListView.getWidth();
174 }
175
176 switch (motionEvent.getActionMasked()) {
177 case MotionEvent.ACTION_DOWN: {
178 if (mPaused) {
179 return false;
180 }
181
182 // TODO: ensure this is a finger, and set a flag
183
184 // Find the child view that was touched (perform a hit test)
185 Rect rect = new Rect();
186 int childCount = mListView.getChildCount();
187 int[] listViewCoords = new int[2];
188 mListView.getLocationOnScreen(listViewCoords);
189 int x = (int) motionEvent.getRawX() - listViewCoords[0];
190 int y = (int) motionEvent.getRawY() - listViewCoords[1];
191 View child;
192 for (int i = 0; i < childCount; i++) {
193 child = mListView.getChildAt(i);
194 child.getHitRect(rect);
195 if (rect.contains(x, y)) {
196 mDownView = child;
197 break;
198 }
199 }
200
201 if (mDownView != null) {
202 mDownX = motionEvent.getRawX();
203 mDownY = motionEvent.getRawY();
204 mDownPosition = mListView.getPositionForView(mDownView);
205 if (mCallbacks.canDismiss(mDownPosition)) {
206 mVelocityTracker = VelocityTracker.obtain();
207 mVelocityTracker.addMovement(motionEvent);
208 } else {
209 mDownView = null;
210 }
211 }
212 return false;
213 }
214
215 case MotionEvent.ACTION_CANCEL: {
216 if (mVelocityTracker == null) {
217 break;
218 }
219
220 if (mDownView != null && mSwiping) {
221 // cancel
222 mDownView.animate()
223 .translationX(0)
224 .alpha(1)
225 .setDuration(mAnimationTime)
226 .setListener(null);
227 }
228 mVelocityTracker.recycle();
229 mVelocityTracker = null;
230 mDownX = 0;
231 mDownY = 0;
232 mDownView = null;
233 mDownPosition = ListView.INVALID_POSITION;
234 mSwiping = false;
235 break;
236 }
237
238 case MotionEvent.ACTION_UP: {
239 if (mVelocityTracker == null) {
240 break;
241 }
242
243 float deltaX = motionEvent.getRawX() - mDownX;
244 mVelocityTracker.addMovement(motionEvent);
245 mVelocityTracker.computeCurrentVelocity(1000);
246 float velocityX = mVelocityTracker.getXVelocity();
247 float absVelocityX = Math.abs(velocityX);
248 float absVelocityY = Math.abs(mVelocityTracker.getYVelocity());
249 boolean dismiss = false;
250 boolean dismissRight = false;
251 if (Math.abs(deltaX) > mViewWidth / 2 && mSwiping) {
252 dismiss = true;
253 dismissRight = deltaX > 0;
254 } else if (mMinFlingVelocity <= absVelocityX && absVelocityX <= mMaxFlingVelocity
255 && absVelocityY < absVelocityX && mSwiping) {
256 // dismiss only if flinging in the same direction as dragging
257 dismiss = (velocityX < 0) == (deltaX < 0);
258 dismissRight = mVelocityTracker.getXVelocity() > 0;
259 }
260 if (dismiss && mDownPosition != ListView.INVALID_POSITION) {
261 // dismiss
262 final View downView = mDownView; // mDownView gets null'd before animation ends
263 final int downPosition = mDownPosition;
264 ++mDismissAnimationRefCount;
265 mDownView.animate()
266 .translationX(dismissRight ? mViewWidth : -mViewWidth)
267 .alpha(0)
268 .setDuration(mAnimationTime)
269 .setListener(new AnimatorListenerAdapter() {
270 @Override
271 public void onAnimationEnd(Animator animation) {
272 performDismiss(downView, downPosition);
273 }
274 });
275 } else {
276 // cancel
277 mDownView.animate()
278 .translationX(0)
279 .alpha(1)
280 .setDuration(mAnimationTime)
281 .setListener(null);
282 }
283 mVelocityTracker.recycle();
284 mVelocityTracker = null;
285 mDownX = 0;
286 mDownY = 0;
287 mDownView = null;
288 mDownPosition = ListView.INVALID_POSITION;
289 mSwiping = false;
290 break;
291 }
292
293 case MotionEvent.ACTION_MOVE: {
294 if (mVelocityTracker == null || mPaused) {
295 break;
296 }
297
298 mVelocityTracker.addMovement(motionEvent);
299 float deltaX = motionEvent.getRawX() - mDownX;
300 float deltaY = motionEvent.getRawY() - mDownY;
301 if (Math.abs(deltaX) > mSlop && Math.abs(deltaY) < Math.abs(deltaX) / 2) {
302 mSwiping = true;
303 mSwipingSlop = (deltaX > 0 ? mSlop : -mSlop);
304 mListView.requestDisallowInterceptTouchEvent(true);
305
306 // Cancel ListView's touch (un-highlighting the item)
307 MotionEvent cancelEvent = MotionEvent.obtain(motionEvent);
308 cancelEvent.setAction(MotionEvent.ACTION_CANCEL |
309 (motionEvent.getActionIndex()
310 << MotionEvent.ACTION_POINTER_INDEX_SHIFT));
311 mListView.onTouchEvent(cancelEvent);
312 cancelEvent.recycle();
313 }
314
315 if (mSwiping) {
316 mDownView.setTranslationX(deltaX - mSwipingSlop);
317 mDownView.setAlpha(Math.max(0f, Math.min(1f,
318 1f - 2f * Math.abs(deltaX) / mViewWidth)));
319 return true;
320 }
321 break;
322 }
323 }
324 return false;
325 }
326
327 class PendingDismissData implements Comparable<PendingDismissData> {
328 public int position;
329 public View view;
330
331 public PendingDismissData(int position, View view) {
332 this.position = position;
333 this.view = view;
334 }
335
336 @Override
337 public int compareTo(PendingDismissData other) {
338 // Sort by descending position
339 return other.position - position;
340 }
341 }
342
343 private void performDismiss(final View dismissView, final int dismissPosition) {
344 // Animate the dismissed list item to zero-height and fire the dismiss callback when
345 // all dismissed list item animations have completed. This triggers layout on each animation
346 // frame; in the future we may want to do something smarter and more performant.
347
348 final ViewGroup.LayoutParams lp = dismissView.getLayoutParams();
349 final int originalHeight = dismissView.getHeight();
350
351 ValueAnimator animator = ValueAnimator.ofInt(originalHeight, 1).setDuration(mAnimationTime);
352
353 animator.addListener(new AnimatorListenerAdapter() {
354 @Override
355 public void onAnimationEnd(Animator animation) {
356 --mDismissAnimationRefCount;
357 if (mDismissAnimationRefCount == 0) {
358 // No active animations, process all pending dismisses.
359 // Sort by descending position
360 Collections.sort(mPendingDismisses);
361
362 int[] dismissPositions = new int[mPendingDismisses.size()];
363 for (int i = mPendingDismisses.size() - 1; i >= 0; i--) {
364 dismissPositions[i] = mPendingDismisses.get(i).position;
365 }
366 mCallbacks.onDismiss(mListView, dismissPositions);
367
368 // Reset mDownPosition to avoid MotionEvent.ACTION_UP trying to start a dismiss
369 // animation with a stale position
370 mDownPosition = ListView.INVALID_POSITION;
371
372 ViewGroup.LayoutParams lp;
373 for (PendingDismissData pendingDismiss : mPendingDismisses) {
374 // Reset view presentation
375 pendingDismiss.view.setAlpha(1f);
376 pendingDismiss.view.setTranslationX(0);
377 lp = pendingDismiss.view.getLayoutParams();
378 lp.height = originalHeight;
379 pendingDismiss.view.setLayoutParams(lp);
380 }
381
382 // Send a cancel event
383 long time = SystemClock.uptimeMillis();
384 MotionEvent cancelEvent = MotionEvent.obtain(time, time,
385 MotionEvent.ACTION_CANCEL, 0, 0, 0);
386 mListView.dispatchTouchEvent(cancelEvent);
387
388 mPendingDismisses.clear();
389 }
390 }
391 });
392
393 animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
394 @Override
395 public void onAnimationUpdate(ValueAnimator valueAnimator) {
396 lp.height = (Integer) valueAnimator.getAnimatedValue();
397 dismissView.setLayoutParams(lp);
398 }
399 });
400
401 mPendingDismisses.add(new PendingDismissData(dismissPosition, dismissView));
402 animator.start();
403 }
404 }
SwipeDismissListViewTouchListener.java
下面看測試的代碼：
activity_main.xml：
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1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
2 xmlns:tools="http://schemas.android.com/tools"
3 android:layout_width="match_parent"
4 android:layout_height="match_parent" >
5
6 <ListView
7 android:id="@+id/listView"
8 android:layout_width="match_parent"
9 android:layout_height="match_parent" />
10
11 </RelativeLayout>
activity_main.xml
MainActivity.java:
1 package com.zzw.testswipetodismiss;
2
3 import java.util.ArrayList;
4
5 import android.app.Activity;
6 import android.os.Bundle;
7 import android.widget.ArrayAdapter;
8 import android.widget.ListView;
9 import android.widget.Toast;
10
11 public class MainActivity extends Activity {
12
13 private ListView listView;
14 private ArrayList<String> datas;
15 private ArrayAdapter adapter;
16
17 @Override
18 protected void onCreate(Bundle savedInstanceState) {
19 super.onCreate(savedInstanceState);
20 setContentView(R.layout.activity_main);
21
22 datas = new ArrayList<String>();
23
24 // 添加測試數據
25 for (int i = 0; i <= 50; i++) {
26 datas.add("測試數據-->" + i);
27 }
28
29 listView = (ListView) findViewById(R.id.listView);
30
31 adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, datas);
32 listView.setAdapter(adapter);
33
34 // 將ListView傳遞過來。
35 SwipeDismissListViewTouchListener touchListener = new SwipeDismissListViewTouchListener(listView,
36 new SwipeDismissListViewTouchListener.DismissCallbacks() {
37
38 // 此處將執行刪除，記得要notifyDataSetChanged()
39 @Override
40 public void onDismiss(ListView listView, int[] reverseSortedPositions) {
41 for (int pos : reverseSortedPositions) {
42 datas.remove(pos);
43 Toast.makeText(getApplicationContext(), "數據" + pos + "刪除成功", 0).show();
44 }
45 adapter.notifyDataSetChanged();
46 }
47
48 @Override
49 public boolean canDismiss(int position) {
50
51 return true;
52 }
53 });
54
55 listView.setOnTouchListener(touchListener);
56 }
57
58 }
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