我正在制作一个应用程序,用于将滑动轨迹、触摸持续时间等数据存储到 Firebase。应为每个触摸会话存储此数据。但是我在获取用户触摸的所有坐标时遇到了问题。为了实现这一点,我将 dispatchTouchEvent()
类和其他函数用于 motionEvent,如下所示:
public boolean dispatchTouchEvent(MotionEvent event) {
TouchData touchData = new TouchData();
int index = event.getActionIndex();
int pointerId = event.getPointerId(index);
List<Float> xTraj = new ArrayList<Float>();
List<Float> yTraj = new ArrayList<Float>();
final int X = (int) event.getRawX();
final int Y = (int) event.getRawY();
xTraj.add(event.getX());
yTraj.add(event.getY());
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
xTraj.add(event.getX());
yTraj.add(event.getY());
if(mVelocityTracker == null) {
// Retrieve a new VelocityTracker object to watch the velocity of a motion.
mVelocityTracker = VelocityTracker.obtain();
}
else {
// Reset the velocity tracker back to its initial state.
mVelocityTracker.clear();
}
// Add a user's movement to the tracker.
mVelocityTracker.addMovement(event);
break;
case MotionEvent.ACTION_UP:
float centreX = button.getX() + button.getWidth() / 2;
float centreY = button.getY() + button.getHeight() / 2;
long eventDuration = event.getEventTime() - event.getDownTime();
DatabaseReference newRef = FirebaseDatabase.getInstance("https://pragya-datacollector.firebaseio.com").getReference();
touchData.setUniqueID(currentUserID);
touchData.setTaskName(TASK_NAME);
touchData.setTouchDuration(eventDuration);
touchData.setxTrajectory(xTraj);
touchData.setyTrajectory(yTraj);
touchData.setxVelocity(xVelocity);
touchData.setyVelocity(yVelocity);
touchData.setTargetX(centreX);
touchData.setTargetY(centreY);
newRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
databaseReference.push().setValue(touchData);
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
break;
case MotionEvent.ACTION_MOVE:
mVelocityTracker.addMovement(event);
mVelocityTracker.computeCurrentVelocity(1);
xVelocity = mVelocityTracker.getXVelocity();
yVelocity = mVelocityTracker.getYVelocity();
xTraj.add(event.getX());
yTraj.add(event.getY());
break;
case MotionEvent.ACTION_CANCEL:
mVelocityTracker.recycle();
break;
}
return super.dispatchTouchEvent(event);
}
其中 TouchData
如下:
public class TouchData {
private String taskName;
private long touchDuration;
private List<Float> xTrajectory;
private List<Float> yTrajectory;
private float xVelocity;
private float yVelocity;
private String uniqueID;
private float targetX;
private float targetY;
public TouchData() {
}
public String getTaskName() {
return taskName;
}
public void setTaskName(String taskName) {
this.taskName = taskName;
}
public List<Float> getxTrajectory() {
return xTrajectory;
}
public void setxTrajectory(List<Float> touchTrajectory) {
this.xTrajectory = xTrajectory;
}
public List<Float> getyTrajectory() {
return yTrajectory;
}
public void setyTrajectory(List<Float> touchTrajectory) {
this.yTrajectory = yTrajectory;
}
public long getTouchDuration() {
return touchDuration;
}
public void setTouchDuration(long touchDuration) {
this.touchDuration = touchDuration;
}
public float getxVelocity() {
return xVelocity;
}
public void setxVelocity(float xVelocity) {
this.xVelocity = xVelocity;
}
public float getyVelocity() {
return yVelocity;
}
public void setyVelocity(float yVelocity) {
this.yVelocity = yVelocity;
}
public String getUniqueID()
{
return uniqueID;
}
public void setUniqueID(String uniqueID) {
this.uniqueID = uniqueID;
}
public float getTargetX() {
return targetX;
}
public void setTargetX(float targetX) {
this.targetX = targetX;
}
public float getTargetY() {
return targetY;
}
public void setTargetY(float targetY) {
this.targetY = targetY;
}
}
一旦用户触摸屏幕,我就需要一组新的 TouchData
值并将其存储在数据库中。但是在这个实现中发生的事情是对于触摸事件,只有一个单个值被存储在列表中。为什么会发生这种情况?
这种存储用户触摸轨迹的实现到底有什么问题?