Android的SwipeToDismiss是github上一个第三方开源框架(github上的项目链接地址:https://github.com/romannurik/Android-SwipeToDismiss )。该开源项目旨在:使得一个ListView的item在用户 ...
Android的SwipeToDismiss是github上一个第三方开源框架(github上的项目链接地址:https://github.com/romannurik/Android-SwipeToDismiss )。
该开源项目旨在:使得一个ListView的item在用户的手指在屏幕上左滑或者右滑时候,删除当前的这个ListView Item。
下载下来只需找到其中的SwipeDismissListViewTouchListener.java类,复制粘贴到需要的包中:
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 client102 * 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 item112 * positions.113 *114 * @param listView The originating {@link ListView}.115 * @param reverseSortedPositions An array of positions to dismiss, sorted in descending116 * 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 to126 * 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 {@link150 * ListView} using {@link ListView#setOnScrollListener(AbsListView.OnScrollListener)}.151 * If a scroll listener is already assigned, the caller should still pass scroll changes through152 * to this listener. This will ensure that this {@link SwipeDismissListViewTouchListener} is153 * paused during list view scrolling.</p>154 *155 * @see SwipeDismissListViewTouchListener156 */157 public AbsListView.OnScrollListener makeScrollListener() {158 return new AbsListView.OnScrollListener() {159 @Override160 public void onScrollStateChanged(AbsListView absListView, int scrollState) {161 setEnabled(scrollState != AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);162 }163 164 @Override165 public void onScroll(AbsListView absListView, int i, int i1, int i2) {166 }167 };168 }169 170 @Override171 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 flag183 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 // cancel222 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 <= mMaxFlingVelocity255 && absVelocityY < absVelocityX && mSwiping) {256 // dismiss only if flinging in the same direction as dragging257 dismiss = (velocityX < 0) == (deltaX < 0);258 dismissRight = mVelocityTracker.getXVelocity() > 0;259 }260 if (dismiss && mDownPosition != ListView.INVALID_POSITION) {261 // dismiss262 final View downView = mDownView; // mDownView gets null'd before animation ends263 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 @Override271 public void onAnimationEnd(Animator animation) {272 performDismiss(downView, downPosition);273 }274 });275 } else {276 // cancel277 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 @Override337 public int compareTo(PendingDismissData other) {338 // Sort by descending position339 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 when345 // all dismissed list item animations have completed. This triggers layout on each animation346 // 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 @Override355 public void onAnimationEnd(Animator animation) {356 --mDismissAnimationRefCount;357 if (mDismissAnimationRefCount == 0) {358 // No active animations, process all pending dismisses.359 // Sort by descending position360 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 position370 mDownPosition = ListView.INVALID_POSITION;371 372 ViewGroup.LayoutParams lp;373 for (PendingDismissData pendingDismiss : mPendingDismisses) {374 // Reset view presentation375 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 event383 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 @Override395 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 }
原标题:左右滑动删除ListView条目Item
关键词:ie
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