我正在尝试制作动画：
用例： 1.用户向右（水平）滑动/拖动项目，项目被添加到篮子中。如果他再次滑动，它会在篮子中添加一个相同的项目。 2.用户滑动/拖动项目向左（水平），项目从篮子中移除，如果之前添加，如果篮子中没有项目，我们将其保留原样。
拖动效果：当用户拖动时，项目会随手指一起移动。一旦他离开，物品就会回到原位。
缩放效果：当用户点击该项目时，项目会变焦，让用户知道该项目已添加到购物篮中。 （右拖的复制方法）。
我特意为此目的使用OnSwipeTouchListener Class：
import android.content.Context;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import PointF;
public class OnSwipeTouchListener implements OnTouchListener {
private final GestureDetector gestureDetector;
PointF DownPT = null;
PointF StartPT = null;
float startX;
float startY;
public OnSwipeTouchListener(Context context , float x, float y) {
gestureDetector = new GestureDetector(context, new GestureListener());
DownPT = new PointF();
StartPT = new PointF();
this.startX = x;
this.startY = y;
}
public void onSwipeLeft() {
}
public void onSwipeRight() {
}
public boolean onTouch(View v, MotionEvent event) {
int eid = event.getAction();
switch (eid) {
case MotionEvent.ACTION_MOVE:
PointF mv = new PointF(event.getX() - DownPT.x, event.getY() - DownPT.y);
v.setX((int) (StartPT.x + mv.x));
v.setY(this.startY);
StartPT = new PointF(v.getX(), v.getY());
break;
case MotionEvent.ACTION_DOWN:
DownPT.x = event.getX();
DownPT.y = event.getY();
StartPT = new PointF(v.getX(), v.getY());
break;
case MotionEvent.ACTION_UP:
// Move image back to its original position.
v.setX(this.startX);
v.setY(this.startY);
break;
default:
v.setX(this.startX);
v.setY(this.startY);
break;
}
return gestureDetector.onTouchEvent(event);
}
private final class GestureListener extends SimpleOnGestureListener {
private static final int SWIPE_DISTANCE_THRESHOLD = 100;
private static final int SWIPE_VELOCITY_THRESHOLD = 100;
@Override
public boolean onDown(MotionEvent e) {
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
float distanceX = e2.getX() - e1.getX();
float distanceY = e2.getY() - e1.getY();
if (Math.abs(distanceX) > Math.abs(distanceY) && Math.abs(distanceX) > SWIPE_DISTANCE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
if (distanceX > 0)
onSwipeRight();
else
onSwipeLeft();
return true;
}
return false;
}
}
}
当My方法OnTouch如下所示时，我的onSwipeRight（）和onSwipeLeft（）会被触发，但是当我在代码中实现onTouch时，这两种方法不会被触发。
public boolean onTouch(View v, MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
关于Click事件的缩放效果。
在我的片段中，我正在缩放这样的图像。
offerimg1.setOnClickListener（new View.OnClickListener（）{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
zoomAnimation(v, offerimg1);
}
});
我的zoomAnimation方法是：
private void zoomAnimation(View view,ImageView image) {
Animation animation = AnimationUtils.loadAnimation(getActivity().getApplicationContext(), R.anim.zoom);
image.startAnimation(animation);
}
My Zoom正在工作，除非我没有在我的碎片中实现：
offerimg1.setOnTouchListener(new OnSwipeTouchListener(getActivity().getApplicationContext(),offerimg1.getX(),offerimg1.getY()) {
@Override
public void onSwipeLeft() {
Log.d("onTouch "," swipe left");
}
@Override
public void onSwipeRight() {
Log.d("onTouch "," swipe right");
}
});
我不确定这些事件之间的冲突是什么。我需要实现我的上述用例，每个事件都应该适用于每个图像。由于我的图像位于片段的滚动视图中。
如果您愿意，我可以在这里分享更多代码。如果我无法澄清我的问题，请告诉我。
我非常感谢你的帮助。
此致 Shashank Pratap
答案 0 :(得分：0)
最后我解决了这个问题，
使用以上代码找到问题：
onSwipeLeft（）和onSwipeRight（）..因为我的图像随之移动 我的手指，这就是distanceX显示为零的原因， 它始终小于静态SWIPE_DISTANCE_THRESHOLD。并在 代码我们说如果distanceX为负，则其swipeLeft（）else swipeRight（）
解决方案： 我们需要在某种程度上捕获用户移动他/她的手指的方式，因此我决定在MotionEvent.ACTION_MOVE：event中查找mv.x是否为负或mv.x为正。一旦找到它，就很容易做出决定，在此基础上我们可以决定在GestureListener中运行哪种方法。
这是我的OnSwipeTouchListener，我仍然不确定这是否是这种情况的最佳解决方案，但我发现它适用于AVD以及Android设备。
我仍然愿意找到一个很好的，明确的方法（最佳实践）：
import android.content.Context;
import android.content.res.Resources;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewConfiguration;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.Toast;
import R;
import StartingPoints;
import PointF;
public class OnSwipeTouchListener implements OnTouchListener {
private static final String APP = OnSwipeTouchListener.class.getName() ;
private final GestureDetector gestureDetector;
PointF DownPT = null;
PointF StartPT = null;
Context _context;
static boolean isLeftMoved = false;
static boolean isRightMoved = false;
/**
* Max allowed duration for a "click", in milliseconds.
*/
private static final int MAX_CLICK_DURATION = 1000;
/**
* Max allowed distance to move during a "click", in DP.
*/
private static final int MAX_CLICK_DISTANCE = 15;
private static final float PIXELS_PER_SECOND = 5;
private long pressStartTime;
private float pressedX;
private float pressedY;
private boolean stayedWithinClickDistance;
Resources resources;
private float startX = 0f;
private float startY = 0f;
private boolean isNewImage = true;
public OnSwipeTouchListener(Context context, Resources resources) {
this._context = context;
gestureDetector = new GestureDetector(context, new GestureListener());
DownPT = new PointF();
StartPT = new PointF();
this.resources = resources;
}
public void onSwipeLeft() {
}
public void onSwipeRight() {
}
public boolean onTouch(View v, MotionEvent e) {
if(isNewImage){
isNewImage = false;
startX = v.getX();
startY = v.getY();
}
switch (e.getAction()) {
case MotionEvent.ACTION_DOWN:
//animation code
DownPT.x = e.getX();
DownPT.y = e.getY();
StartPT = new PointF(v.getX(), v.getY());
//calculation code
pressStartTime = System.currentTimeMillis();
pressedX = e.getX();
pressedY = e.getY();
stayedWithinClickDistance = true;
break;
case MotionEvent.ACTION_MOVE:
// animation code
PointF mv = new PointF(e.getX() - DownPT.x, e.getY() - DownPT.y);
v.setX((int) (StartPT.x + mv.x));
v.setY(startY);
StartPT = new PointF(v.getX(), v.getY());
if(mv.x < 0 ){
isLeftMoved = true;
}
if(mv.x > 0 ){
isRightMoved = true;
}
//calculation code
if (stayedWithinClickDistance && distance(pressedX, pressedY, e.getX(), e.getY()) > MAX_CLICK_DISTANCE) {
stayedWithinClickDistance = false;
}
Log.d("Moved ","Item moved");
break;
case MotionEvent.ACTION_UP:
if(!stayedWithinClickDistance){
v.setX(startX);
v.setY(startY);
isNewImage = true;
}
long pressDuration = System.currentTimeMillis() - pressStartTime;
if (pressDuration < MAX_CLICK_DURATION && stayedWithinClickDistance) {
// Click event has occurred
Log.d("Stayed"," With Click event");
zoomAnimation(v);
isNewImage = true;
}
break;
default:
// Move image back to its original position, by default
Log.d("default", "This is default ");
v.setX(startX);
v.setY(startY);
isNewImage = true;
break;
}
return gestureDetector.onTouchEvent(e);
}
private float distance(float x1, float y1, float x2, float y2) {
float dx = x1 - x2;
float dy = y1 - y2;
float distanceInPx = (float) Math.sqrt(dx * dx + dy * dy);
return pxToDp(distanceInPx);
}
private float pxToDp(float px) {
return px / resources.getDisplayMetrics().density;
}
private void zoomAnimation(View view) {
Animation animation = AnimationUtils.loadAnimation(_context, R.anim.zoom);
view.startAnimation(animation);
}
private final class GestureListener extends SimpleOnGestureListener {
private static final int SWIPE_DISTANCE_THRESHOLD = 20;
private static final int SWIPE_VELOCITY_THRESHOLD = 50;
@Override
public boolean onDown(MotionEvent e) {
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
float maxFlingVelocity = ViewConfiguration.get(_context).getScaledMaximumFlingVelocity();
float velocityPercentX = velocityX / maxFlingVelocity; // the percent is a value in the range of (0, 1]
float normalizedVelocityX = velocityPercentX * PIXELS_PER_SECOND; // where PIXELS_PER_SECOND is a device-independent measurement
float distanceX = e2.getX() - e1.getX();
float distanceY = e2.getY() - e1.getY();
if (isLeftMoved || isRightMoved) {
if(isRightMoved) {
isLeftMoved = false;
isRightMoved = false;
onSwipeRight();
}
else {
isLeftMoved = false;
isRightMoved = false;
onSwipeLeft();
}
}
return false;
}
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
return true;
}
}
}
祝你好运， Shashank Pratap