我想在我的Android应用程序中使用fling
手势检测功能。
我拥有的GridLayout
包含9 ImageView
个。可在此处找到来源:Romain Guys's Grid Layout。
我拿的那个文件是来自Romain Guy的Photostream application,并且只是略微适应了。
对于简单的点击情况,我只需要为我添加的每个onClickListener
设置ImageView
为实现activity
的主View.OnClickListener
。实现识别fling
的东西似乎更加复杂。我认为这是因为它可能跨越views
?
如果我的活动有效
OnGestureListener
我不知道该怎么做
将其设置为手势监听器
我Grid
或Image
次观看
添加。
public class SelectFilterActivity extends Activity implements
View.OnClickListener, OnGestureListener { ...
如果我的活动有效
OnTouchListener
然后我没有
对onFling
override
的方法(它有
两个事件作为参数允许我
确定是否是这样的
值得注意的)。
public class SelectFilterActivity extends Activity implements
View.OnClickListener, OnTouchListener { ...
如果我制作自定义View
,例如延伸GestureImageView
的{{1}},我不知道如何告诉活动ImageView
已发生风景。无论如何,我试过这个,当我触摸屏幕时没有调用这些方法。
我真的需要一个跨视图的具体例子。什么,何时以及如何附加此fling
?我也需要能够检测到单击。
listener
是否可以在屏幕顶部放置透明视图以捕捉啪啪声?
如果我从XML中选择不// Gesture detection
mGestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
int dx = (int) (e2.getX() - e1.getX());
// don't accept the fling if it's too short
// as it may conflict with a button push
if (Math.abs(dx) > MAJOR_MOVE && Math.abs(velocityX) > Math.absvelocityY)) {
if (velocityX > 0) {
moveRight();
} else {
moveLeft();
}
return true;
} else {
return false;
}
}
});
我的子图像视图,我可以将inflate
作为构造函数参数传递给我创建的GestureDetector
的新子类吗?
这是一项非常简单的活动,我正在努力让ImageView
检测工作:SelectFilterActivity (Adapted from photostream)。
我一直在关注这些来源:
到目前为止,对我来说什么都没有用,我希望有一些指示。
答案 0 :(得分:797)
感谢Code Shogun,我的代码适应了我的情况。
让您的活动像往常一样实施OnClickListener
:
public class SelectFilterActivity extends Activity implements OnClickListener {
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private GestureDetector gestureDetector;
View.OnTouchListener gestureListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/* ... */
// Gesture detection
gestureDetector = new GestureDetector(this, new MyGestureDetector());
gestureListener = new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
};
}
class MyGestureDetector extends SimpleOnGestureListener {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
try {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
// right to left swipe
if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
Toast.makeText(SelectFilterActivity.this, "Left Swipe", Toast.LENGTH_SHORT).show();
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
Toast.makeText(SelectFilterActivity.this, "Right Swipe", Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
// nothing
}
return false;
}
@Override
public boolean onDown(MotionEvent e) {
return true;
}
}
}
将您的手势监听器附加到您添加到主布局的所有视图中;
// Do this for each view added to the grid
imageView.setOnClickListener(SelectFilterActivity.this);
imageView.setOnTouchListener(gestureListener);
当您的被覆盖的方法被点击时,请注意,活动的onClick(View v)
和手势监听器的onFling
。
public void onClick(View v) {
Filter f = (Filter) v.getTag();
FilterFullscreenActivity.show(this, input, f);
}
帖子'fling'舞蹈是可选的,但鼓励。
答案 1 :(得分:207)
上面的一个答案提到处理不同的像素密度,但建议手动计算滑动参数。值得注意的是,您可以使用ViewConfiguration
类从系统中实际获得缩放的合理值:
final ViewConfiguration vc = ViewConfiguration.get(getContext());
final int swipeMinDistance = vc.getScaledPagingTouchSlop();
final int swipeThresholdVelocity = vc.getScaledMinimumFlingVelocity();
final int swipeMaxOffPath = vc.getScaledTouchSlop();
// (there is also vc.getScaledMaximumFlingVelocity() one could check against)
我注意到使用这些值会使应用程序与系统其余部分之间的“感觉”更加一致。
答案 2 :(得分:144)
我做的有点不同,并编写了一个额外的检测器类来实现View.onTouchListener
onCreate
只需将其添加到最低的布局,如下所示:
ActivitySwipeDetector activitySwipeDetector = new ActivitySwipeDetector(this);
lowestLayout = (RelativeLayout)this.findViewById(R.id.lowestLayout);
lowestLayout.setOnTouchListener(activitySwipeDetector);
其中id.lowestLayout是布局层次结构中最低视图的id.xxx,而LowestLayout被声明为RelativeLayout
然后有实际的活动刷卡检测器类:
public class ActivitySwipeDetector implements View.OnTouchListener {
static final String logTag = "ActivitySwipeDetector";
private Activity activity;
static final int MIN_DISTANCE = 100;
private float downX, downY, upX, upY;
public ActivitySwipeDetector(Activity activity){
this.activity = activity;
}
public void onRightSwipe(){
Log.i(logTag, "RightToLeftSwipe!");
activity.doSomething();
}
public void onLeftSwipe(){
Log.i(logTag, "LeftToRightSwipe!");
activity.doSomething();
}
public void onDownSwipe(){
Log.i(logTag, "onTopToBottomSwipe!");
activity.doSomething();
}
public void onUpSwipe(){
Log.i(logTag, "onBottomToTopSwipe!");
activity.doSomething();
}
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()){
case MotionEvent.ACTION_DOWN: {
downX = event.getX();
downY = event.getY();
return true;
}
case MotionEvent.ACTION_UP: {
upX = event.getX();
upY = event.getY();
float deltaX = downX - upX;
float deltaY = downY - upY;
// swipe horizontal?
if(Math.abs(deltaX) > Math.abs(deltaY))
{
if(Math.abs(deltaX) > MIN_DISTANCE){
// left or right
if(deltaX > 0) { this.onRightSwipe(); return true; }
if(deltaX < 0) { this.onLeftSwipe(); return true; }
}
else {
Log.i(logTag, "Horizontal Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
return false; // We don't consume the event
}
}
// swipe vertical?
else
{
if(Math.abs(deltaY) > MIN_DISTANCE){
// top or down
if(deltaY < 0) { this.onDownSwipe(); return true; }
if(deltaY > 0) { this.onUpSwipe(); return true; }
}
else {
Log.i(logTag, "Vertical Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
return false; // We don't consume the event
}
}
return true;
}
}
return false;
}
}
对我来说真的很好用!
答案 3 :(得分:93)
整个系统由两个文件组成, SwipeInterface 和 ActivitySwipeDetector
SwipeInterface.java
import android.view.View;
public interface SwipeInterface {
public void bottom2top(View v);
public void left2right(View v);
public void right2left(View v);
public void top2bottom(View v);
}
检测器
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
public class ActivitySwipeDetector implements View.OnTouchListener {
static final String logTag = "ActivitySwipeDetector";
private SwipeInterface activity;
static final int MIN_DISTANCE = 100;
private float downX, downY, upX, upY;
public ActivitySwipeDetector(SwipeInterface activity){
this.activity = activity;
}
public void onRightToLeftSwipe(View v){
Log.i(logTag, "RightToLeftSwipe!");
activity.right2left(v);
}
public void onLeftToRightSwipe(View v){
Log.i(logTag, "LeftToRightSwipe!");
activity.left2right(v);
}
public void onTopToBottomSwipe(View v){
Log.i(logTag, "onTopToBottomSwipe!");
activity.top2bottom(v);
}
public void onBottomToTopSwipe(View v){
Log.i(logTag, "onBottomToTopSwipe!");
activity.bottom2top(v);
}
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()){
case MotionEvent.ACTION_DOWN: {
downX = event.getX();
downY = event.getY();
return true;
}
case MotionEvent.ACTION_UP: {
upX = event.getX();
upY = event.getY();
float deltaX = downX - upX;
float deltaY = downY - upY;
// swipe horizontal?
if(Math.abs(deltaX) > MIN_DISTANCE){
// left or right
if(deltaX < 0) { this.onLeftToRightSwipe(v); return true; }
if(deltaX > 0) { this.onRightToLeftSwipe(v); return true; }
}
else {
Log.i(logTag, "Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
}
// swipe vertical?
if(Math.abs(deltaY) > MIN_DISTANCE){
// top or down
if(deltaY < 0) { this.onTopToBottomSwipe(v); return true; }
if(deltaY > 0) { this.onBottomToTopSwipe(v); return true; }
}
else {
Log.i(logTag, "Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
v.performClick();
}
}
}
return false;
}
}
它的使用方式如下:
ActivitySwipeDetector swipe = new ActivitySwipeDetector(this);
LinearLayout swipe_layout = (LinearLayout) findViewById(R.id.swipe_layout);
swipe_layout.setOnTouchListener(swipe);
在实施Activity
时,您需要实现 SwipeInterface 中的方法,并且您可以找到调用 Swipe Event 的视图。
@Override
public void left2right(View v) {
switch(v.getId()){
case R.id.swipe_layout:
// do your stuff here
break;
}
}
答案 4 :(得分:65)
上面的滑动手势检测器代码非常有用!但是,您可以通过使用以下相对值(REL_SWIPE)
而不是绝对值(SWIPE_)
DisplayMetrics dm = getResources().getDisplayMetrics();
int REL_SWIPE_MIN_DISTANCE = (int)(SWIPE_MIN_DISTANCE * dm.densityDpi / 160.0f);
int REL_SWIPE_MAX_OFF_PATH = (int)(SWIPE_MAX_OFF_PATH * dm.densityDpi / 160.0f);
int REL_SWIPE_THRESHOLD_VELOCITY = (int)(SWIPE_THRESHOLD_VELOCITY * dm.densityDpi / 160.0f);
答案 5 :(得分:34)
我Thomas Fankhauser和Marek Sebera提出的解决方案版本(不处理垂直滑动):
<强> SwipeInterface.java 强>
import android.view.View;
public interface SwipeInterface {
public void onLeftToRight(View v);
public void onRightToLeft(View v);
}
<强> ActivitySwipeDetector.java 强>
import android.content.Context;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
public class ActivitySwipeDetector implements View.OnTouchListener {
static final String logTag = "ActivitySwipeDetector";
private SwipeInterface activity;
private float downX, downY;
private long timeDown;
private final float MIN_DISTANCE;
private final int VELOCITY;
private final float MAX_OFF_PATH;
public ActivitySwipeDetector(Context context, SwipeInterface activity){
this.activity = activity;
final ViewConfiguration vc = ViewConfiguration.get(context);
DisplayMetrics dm = context.getResources().getDisplayMetrics();
MIN_DISTANCE = vc.getScaledPagingTouchSlop() * dm.density;
VELOCITY = vc.getScaledMinimumFlingVelocity();
MAX_OFF_PATH = MIN_DISTANCE * 2;
}
public void onRightToLeftSwipe(View v){
Log.i(logTag, "RightToLeftSwipe!");
activity.onRightToLeft(v);
}
public void onLeftToRightSwipe(View v){
Log.i(logTag, "LeftToRightSwipe!");
activity.onLeftToRight(v);
}
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()){
case MotionEvent.ACTION_DOWN: {
Log.d("onTouch", "ACTION_DOWN");
timeDown = System.currentTimeMillis();
downX = event.getX();
downY = event.getY();
return true;
}
case MotionEvent.ACTION_UP: {
Log.d("onTouch", "ACTION_UP");
long timeUp = System.currentTimeMillis();
float upX = event.getX();
float upY = event.getY();
float deltaX = downX - upX;
float absDeltaX = Math.abs(deltaX);
float deltaY = downY - upY;
float absDeltaY = Math.abs(deltaY);
long time = timeUp - timeDown;
if (absDeltaY > MAX_OFF_PATH) {
Log.i(logTag, String.format("absDeltaY=%.2f, MAX_OFF_PATH=%.2f", absDeltaY, MAX_OFF_PATH));
return v.performClick();
}
final long M_SEC = 1000;
if (absDeltaX > MIN_DISTANCE && absDeltaX > time * VELOCITY / M_SEC) {
if(deltaX < 0) { this.onLeftToRightSwipe(v); return true; }
if(deltaX > 0) { this.onRightToLeftSwipe(v); return true; }
} else {
Log.i(logTag, String.format("absDeltaX=%.2f, MIN_DISTANCE=%.2f, absDeltaX > MIN_DISTANCE=%b", absDeltaX, MIN_DISTANCE, (absDeltaX > MIN_DISTANCE)));
Log.i(logTag, String.format("absDeltaX=%.2f, time=%d, VELOCITY=%d, time*VELOCITY/M_SEC=%d, absDeltaX > time * VELOCITY / M_SEC=%b", absDeltaX, time, VELOCITY, time * VELOCITY / M_SEC, (absDeltaX > time * VELOCITY / M_SEC)));
}
}
}
return false;
}
}
答案 6 :(得分:25)
此问题有点陈旧,2011年7月Google发布了Compatibility Package, revision 3),其中包含适用于Android 1.6的ViewPager
。针对此问题发布的GestureListener
个答案在Android上感觉不是很优雅。如果您正在寻找在Android图库中切换照片或在新的Play Market应用中切换视图时使用的代码,那么它绝对是ViewPager
。
以下是一些更多信息的链接:
答案 7 :(得分:18)
答案 8 :(得分:15)
在网页(和此页面)上有一些建议使用ViewConfiguration。 getScaledTouchSlop()来为SWIPE_MIN_DISTANCE
设置一个设备缩放值。
getScaledTouchSlop()
用于“滚动阈值”距离,而不是滑动。滚动阈值距离必须小于“页面间摆动”阈值距离。例如,此功能在我的三星GS2上返回12个像素,此页面中引用的示例大约为100像素。
使用API等级8(Android 2.2,Froyo),您有 getScaledPagingTouchSlop()
,用于页面滑动。
在我的设备上,它返回24(像素)。因此,如果您使用的是API级别&lt; 8,我认为“2 * getScaledTouchSlop()
”应该是“标准”滑动阈值。
但我的小屏幕应用程序的用户告诉我它太少了......在我的应用程序中,您可以垂直滚动,并水平更改页面。使用建议的值,它们有时会更改页面而不是滚动。
答案 9 :(得分:13)
也作为一个小的改进。
try / catch块的主要原因是初始移动的e1可能为null。除了try / catch之外,还包括null和return的测试。 类似于以下
if (e1 == null || e2 == null) return false;
try {
...
} catch (Exception e) {}
return false;
答案 10 :(得分:12)
这里有很多优秀的信息。不幸的是,很多这种处理代码分散在各种完成状态的网站上,尽管人们会认为这对许多应用程序来说都是必不可少的。
我花时间创建了一个fling listener来验证是否符合相应的条件。我添加了page fling listener,添加了更多检查以确保flings满足页面flings的阈值。这两种侦听器都允许您轻松地将晃动限制在水平轴或垂直轴上。你可以在view for sliding images中看到它是如何使用的。我承认这里的人已完成了大部分的研究 - 我只是把它放在一个可用的库中。
最近几天代表我第一次尝试在Android上编码;期待much more来。
答案 11 :(得分:12)
如果有人想要一个有效的实施,这是两个答案的综合答案。
package com.yourapplication;
import android.content.Context;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
public abstract class OnSwipeListener implements View.OnTouchListener {
private final GestureDetector gestureDetector;
public OnSwipeListener(Context context){
gestureDetector = new GestureDetector(context, new OnSwipeGestureListener(context));
gestureDetector.setIsLongpressEnabled(false);
}
@Override
public boolean onTouch(View view, MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
private final class OnSwipeGestureListener extends GestureDetector.SimpleOnGestureListener {
private final int minSwipeDelta;
private final int minSwipeVelocity;
private final int maxSwipeVelocity;
private OnSwipeGestureListener(Context context) {
ViewConfiguration configuration = ViewConfiguration.get(context);
// We think a swipe scrolls a full page.
//minSwipeDelta = configuration.getScaledTouchSlop();
minSwipeDelta = configuration.getScaledPagingTouchSlop();
minSwipeVelocity = configuration.getScaledMinimumFlingVelocity();
maxSwipeVelocity = configuration.getScaledMaximumFlingVelocity();
}
@Override
public boolean onDown(MotionEvent event) {
// Return true because we want system to report subsequent events to us.
return true;
}
// NOTE: see http://stackoverflow.com/questions/937313/android-basic-gesture-detection
@Override
public boolean onFling(MotionEvent event1, MotionEvent event2, float velocityX,
float velocityY) {
boolean result = false;
try {
float deltaX = event2.getX() - event1.getX();
float deltaY = event2.getY() - event1.getY();
float absVelocityX = Math.abs(velocityX);
float absVelocityY = Math.abs(velocityY);
float absDeltaX = Math.abs(deltaX);
float absDeltaY = Math.abs(deltaY);
if (absDeltaX > absDeltaY) {
if (absDeltaX > minSwipeDelta && absVelocityX > minSwipeVelocity
&& absVelocityX < maxSwipeVelocity) {
if (deltaX < 0) {
onSwipeLeft();
} else {
onSwipeRight();
}
}
result = true;
} else if (absDeltaY > minSwipeDelta && absVelocityY > minSwipeVelocity
&& absVelocityY < maxSwipeVelocity) {
if (deltaY < 0) {
onSwipeTop();
} else {
onSwipeBottom();
}
}
result = true;
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
}
public void onSwipeLeft() {}
public void onSwipeRight() {}
public void onSwipeTop() {}
public void onSwipeBottom() {}
}
答案 12 :(得分:11)
您可以使用droidQuery库来处理翻转,点击,长按和自定义事件。该实现基于我之前的答案,但 droidQuery 提供了一个灵活,简单的语法:
//global variables private boolean isSwiping = false;
private SwipeDetector.Direction swipeDirection = null;
private View v;//must be instantiated before next call.
//swipe-handling code
$.with(v).swipe(new Function() {
@Override
public void invoke($ droidQuery, Object... params) {
if (params[0] == SwipeDetector.Direction.START)
isSwiping = true;
else if (params[0] == SwipeDetector.Direction.STOP) {
if (isSwiping) { isSwiping = false;
if (swipeDirection != null) {
switch(swipeDirection) {
case DOWN : //TODO: Down swipe complete, so do something
break;
case UP :
//TODO: Up swipe complete, so do something
break;
case LEFT :
//TODO: Left swipe complete, so do something
break;
case RIGHT :
//TODO: Right swipe complete, so do something
break;
default : break;
}
} }
}
else {
swipeDirection = (SwipeDetector.Direction) params[0];
}
}
});
此答案使用了其他答案中的组件组合。它由SwipeDetector
类组成,它具有用于侦听事件的内部接口。我还提供RelativeLayout
来展示如何覆盖View
的{{1}}方法以同时允许滑动事件和其他检测到的事件(例如点击或长按)。
<强> SwipeDetector 强>
onTouch
滑动拦截器视图
package self.philbrown;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
/**
* Detect Swipes on a per-view basis. Based on original code by Thomas Fankhauser on StackOverflow.com,
* with adaptations by other authors (see link).
* @author Phil Brown
* @see <a href="http://stackoverflow.com/questions/937313/android-basic-gesture-detection">android-basic-gesture-detection</a>
*/
public class SwipeDetector implements View.OnTouchListener
{
/**
* The minimum distance a finger must travel in order to register a swipe event.
*/
private int minSwipeDistance;
/** Maintains a reference to the first detected down touch event. */
private float downX, downY;
/** Maintains a reference to the first detected up touch event. */
private float upX, upY;
/** provides access to size and dimension contants */
private ViewConfiguration config;
/**
* provides callbacks to a listener class for various swipe gestures.
*/
private SwipeListener listener;
public SwipeDetector(SwipeListener listener)
{
this.listener = listener;
}
/**
* {@inheritDoc}
*/
public boolean onTouch(View v, MotionEvent event)
{
if (config == null)
{
config = ViewConfiguration.get(v.getContext());
minSwipeDistance = config.getScaledTouchSlop();
}
switch(event.getAction())
{
case MotionEvent.ACTION_DOWN:
downX = event.getX();
downY = event.getY();
return true;
case MotionEvent.ACTION_UP:
upX = event.getX();
upY = event.getY();
float deltaX = downX - upX;
float deltaY = downY - upY;
// swipe horizontal?
if(Math.abs(deltaX) > minSwipeDistance)
{
// left or right
if (deltaX < 0)
{
if (listener != null)
{
listener.onRightSwipe(v);
return true;
}
}
if (deltaX > 0)
{
if (listener != null)
{
listener.onLeftSwipe(v);
return true;
}
}
}
// swipe vertical?
if(Math.abs(deltaY) > minSwipeDistance)
{
// top or down
if (deltaY < 0)
{
if (listener != null)
{
listener.onDownSwipe(v);
return true;
}
}
if (deltaY > 0)
{
if (listener != null)
{
listener.onUpSwipe(v);
return true;
}
}
}
}
return false;
}
/**
* Provides callbacks to a registered listener for swipe events in {@link SwipeDetector}
* @author Phil Brown
*/
public interface SwipeListener
{
/** Callback for registering a new swipe motion from the bottom of the view toward its top. */
public void onUpSwipe(View v);
/** Callback for registering a new swipe motion from the left of the view toward its right. */
public void onRightSwipe(View v);
/** Callback for registering a new swipe motion from the right of the view toward its left. */
public void onLeftSwipe(View v);
/** Callback for registering a new swipe motion from the top of the view toward its bottom. */
public void onDownSwipe(View v);
}
}
答案 13 :(得分:7)
我知道回答为时已晚,但我仍在发布对ListView进行滑动检测,了解如何在ListView项目中使用 Swipe Touch Listener 。
参考:Exterminator13(本页答案之一)
制作一个 ActivitySwipeDetector.class
package com.example.wocketapp;
import android.content.Context;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
public class ActivitySwipeDetector implements View.OnTouchListener
{
static final String logTag = "SwipeDetector";
private SwipeInterface activity;
private float downX, downY;
private long timeDown;
private final float MIN_DISTANCE;
private final int VELOCITY;
private final float MAX_OFF_PATH;
public ActivitySwipeDetector(Context context, SwipeInterface activity)
{
this.activity = activity;
final ViewConfiguration vc = ViewConfiguration.get(context);
DisplayMetrics dm = context.getResources().getDisplayMetrics();
MIN_DISTANCE = vc.getScaledPagingTouchSlop() * dm.density;
VELOCITY = vc.getScaledMinimumFlingVelocity();
MAX_OFF_PATH = MIN_DISTANCE * 2;
}
public void onRightToLeftSwipe(View v)
{
Log.i(logTag, "RightToLeftSwipe!");
activity.onRightToLeft(v);
}
public void onLeftToRightSwipe(View v)
{
Log.i(logTag, "LeftToRightSwipe!");
activity.onLeftToRight(v);
}
public boolean onTouch(View v, MotionEvent event)
{
switch (event.getAction())
{
case MotionEvent.ACTION_DOWN:
{
Log.d("onTouch", "ACTION_DOWN");
timeDown = System.currentTimeMillis();
downX = event.getX();
downY = event.getY();
v.getParent().requestDisallowInterceptTouchEvent(false);
return true;
}
case MotionEvent.ACTION_MOVE:
{
float y_up = event.getY();
float deltaY = y_up - downY;
float absDeltaYMove = Math.abs(deltaY);
if (absDeltaYMove > 60)
{
v.getParent().requestDisallowInterceptTouchEvent(false);
}
else
{
v.getParent().requestDisallowInterceptTouchEvent(true);
}
}
break;
case MotionEvent.ACTION_UP:
{
Log.d("onTouch", "ACTION_UP");
long timeUp = System.currentTimeMillis();
float upX = event.getX();
float upY = event.getY();
float deltaX = downX - upX;
float absDeltaX = Math.abs(deltaX);
float deltaY = downY - upY;
float absDeltaY = Math.abs(deltaY);
long time = timeUp - timeDown;
if (absDeltaY > MAX_OFF_PATH)
{
Log.e(logTag, String.format(
"absDeltaY=%.2f, MAX_OFF_PATH=%.2f", absDeltaY,
MAX_OFF_PATH));
return v.performClick();
}
final long M_SEC = 1000;
if (absDeltaX > MIN_DISTANCE && absDeltaX > time * VELOCITY / M_SEC)
{
v.getParent().requestDisallowInterceptTouchEvent(true);
if (deltaX < 0)
{
this.onLeftToRightSwipe(v);
return true;
}
if (deltaX > 0)
{
this.onRightToLeftSwipe(v);
return true;
}
}
else
{
Log.i(logTag,
String.format(
"absDeltaX=%.2f, MIN_DISTANCE=%.2f, absDeltaX > MIN_DISTANCE=%b",
absDeltaX, MIN_DISTANCE,
(absDeltaX > MIN_DISTANCE)));
Log.i(logTag,
String.format(
"absDeltaX=%.2f, time=%d, VELOCITY=%d, time*VELOCITY/M_SEC=%d, absDeltaX > time * VELOCITY / M_SEC=%b",
absDeltaX, time, VELOCITY, time * VELOCITY
/ M_SEC, (absDeltaX > time * VELOCITY
/ M_SEC)));
}
v.getParent().requestDisallowInterceptTouchEvent(false);
}
}
return false;
}
public interface SwipeInterface
{
public void onLeftToRight(View v);
public void onRightToLeft(View v);
}
}
从您的活动类中调用它,如下所示:
yourLayout.setOnTouchListener(new ActivitySwipeDetector(this, your_activity.this));
并且不要忘记实施 SwipeInterface ,这将为您提供两个@override方法:
@Override
public void onLeftToRight(View v)
{
Log.e("TAG", "L to R");
}
@Override
public void onRightToLeft(View v)
{
Log.e("TAG", "R to L");
}
答案 14 :(得分:4)
手势是触发触摸屏和用户之间交互的微妙动作。它持续从屏幕上的第一次触摸到最后一根手指离开表面之间的时间。
Android为我们提供了一个名为GestureDetector的类,使用它我们可以检测常见手势,如向下和向上,垂直和水平滑动(fling),长按和短按,双击等。并将听众附加到他们身上。
制作我们的活动class implement GestureDetector.OnDoubleTapListener(用于双击手势检测)和GestureDetector.OnGestureListener interfaces并实现所有抽象方法。有关详细信息,请参阅。你可以访问https://developer.android.com/training/gestures/detector.html。 Courtesy
用于演示测试。GestureDetectorDemo
答案 15 :(得分:4)
如果你不想创建一个单独的类或使代码复杂,
您可以在OnTouchListener中创建一个GestureDetector变量,使代码更容易
namVyuVar可以是您需要设置列表器
的View的任何名称namVyuVar.setOnTouchListener(new View.OnTouchListener()
{
@Override
public boolean onTouch(View view, MotionEvent MsnEvtPsgVal)
{
flingActionVar.onTouchEvent(MsnEvtPsgVal);
return true;
}
GestureDetector flingActionVar = new GestureDetector(getApplicationContext(), new GestureDetector.SimpleOnGestureListener()
{
private static final int flingActionMinDstVac = 120;
private static final int flingActionMinSpdVac = 200;
@Override
public boolean onFling(MotionEvent fstMsnEvtPsgVal, MotionEvent lstMsnEvtPsgVal, float flingActionXcoSpdPsgVal, float flingActionYcoSpdPsgVal)
{
if(fstMsnEvtPsgVal.getX() - lstMsnEvtPsgVal.getX() > flingActionMinDstVac && Math.abs(flingActionXcoSpdPsgVal) > flingActionMinSpdVac)
{
// TskTdo :=> On Right to Left fling
return false;
}
else if (lstMsnEvtPsgVal.getX() - fstMsnEvtPsgVal.getX() > flingActionMinDstVac && Math.abs(flingActionXcoSpdPsgVal) > flingActionMinSpdVac)
{
// TskTdo :=> On Left to Right fling
return false;
}
if(fstMsnEvtPsgVal.getY() - lstMsnEvtPsgVal.getY() > flingActionMinDstVac && Math.abs(flingActionYcoSpdPsgVal) > flingActionMinSpdVac)
{
// TskTdo :=> On Bottom to Top fling
return false;
}
else if (lstMsnEvtPsgVal.getY() - fstMsnEvtPsgVal.getY() > flingActionMinDstVac && Math.abs(flingActionYcoSpdPsgVal) > flingActionMinSpdVac)
{
// TskTdo :=> On Top to Bottom fling
return false;
}
return false;
}
});
});
答案 16 :(得分:3)
对所有人:不要忘记案例MotionEvent.ACTION_CANCEL:
它在不使用ACTION_UP的情况下调用30%滑动
,在这种情况下等于ACTION_UP
答案 17 :(得分:2)
我建立了一个更通用的类,我使用了Tomas的类,并添加了一个将事件发送到Activity或Fragment的接口。 它将在构造函数上注册侦听器,因此请确保实现接口或者ClassCastException将是thorwn。接口返回四个最终int定义之一 在类中,将返回它被激活的视图。
import android.app.Activity;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
public class SwipeDetector implements View.OnTouchListener{
static final int MIN_DISTANCE = 100;
private float downX, downY, upX, upY;
public final static int RIGHT_TO_LEFT=1;
public final static int LEFT_TO_RIGHT=2;
public final static int TOP_TO_BOTTOM=3;
public final static int BOTTOM_TO_TOP=4;
private View v;
private onSwipeEvent swipeEventListener;
public SwipeDetector(Activity activity,View v){
try{
swipeEventListener=(onSwipeEvent)activity;
}
catch(ClassCastException e)
{
Log.e("ClassCastException",activity.toString()+" must implement SwipeDetector.onSwipeEvent");
}
this.v=v;
}
public SwipeDetector(Fragment fragment,View v){
try{
swipeEventListener=(onSwipeEvent)fragment;
}
catch(ClassCastException e)
{
Log.e("ClassCastException",fragment.toString()+" must implement SwipeDetector.onSwipeEvent");
}
this.v=v;
}
public void onRightToLeftSwipe(){
swipeEventListener.SwipeEventDetected(v,RIGHT_TO_LEFT);
}
public void onLeftToRightSwipe(){
swipeEventListener.SwipeEventDetected(v,LEFT_TO_RIGHT);
}
public void onTopToBottomSwipe(){
swipeEventListener.SwipeEventDetected(v,TOP_TO_BOTTOM);
}
public void onBottomToTopSwipe(){
swipeEventListener.SwipeEventDetected(v,BOTTOM_TO_TOP);
}
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()){
case MotionEvent.ACTION_DOWN: {
downX = event.getX();
downY = event.getY();
return true;
}
case MotionEvent.ACTION_UP: {
upX = event.getX();
upY = event.getY();
float deltaX = downX - upX;
float deltaY = downY - upY;
//HORIZONTAL SCROLL
if(Math.abs(deltaX) > Math.abs(deltaY))
{
if(Math.abs(deltaX) > MIN_DISTANCE){
// left or right
if(deltaX < 0)
{
this.onLeftToRightSwipe();
return true;
}
if(deltaX > 0) {
this.onRightToLeftSwipe();
return true;
}
}
else {
//not long enough swipe...
return false;
}
}
//VERTICAL SCROLL
else
{
if(Math.abs(deltaY) > MIN_DISTANCE){
// top or down
if(deltaY < 0)
{ this.onTopToBottomSwipe();
return true;
}
if(deltaY > 0)
{ this.onBottomToTopSwipe();
return true;
}
}
else {
//not long enough swipe...
return false;
}
}
return true;
}
}
return false;
}
public interface onSwipeEvent
{
public void SwipeEventDetected(View v , int SwipeType);
}
}