没有检测到Fling / Swipe手势
我正在使用内部类SimpleOnGestureListener实施手势检测以进行滑动/滑动移动。 然而，没有检测到手势。
xml布局有一个父ScrollView所以我想知道这是否是一个潜在的原因。
在onCreate我初始化了GestureListener ：
public class ViewSelectedDive extends Activity implements OnClickListener,
OnRatingBarChangeListener {...
public GestureDetectorCompat gestureDetectorObject;
protected void onCreate(Bundle savedInstanceState) {..
// instantiate gesture detector
gestureDetectorObject = new GestureDetectorCompat(this, new GestureListener());
重写onTouchEvent方法以确保在检测到触摸事件时使用手势侦听器。
@Override
public boolean onTouchEvent(MotionEvent event) {
// tell teh activity tto use gerture listener when touch event is detected
gestureDetectorObject.onTouchEvent(event);
Log.d(TAG, "312 ON TOUCH EVENT");
return super.onTouchEvent(event);
}
//内部类来处理guerter检测
public class GestureListener extends GestureDetector.SimpleOnGestureListener{
private float flingMin=100;
private float velocityMin = 100;
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// TODO Auto-generated method stub
Log.d(TAG, "ON FLING INNER CLASS 951");
// user move to next dive in db
boolean moveToNextDive=false;
boolean moveToPreviousDive=false;
// caulate the change in x pos within fling ges
float horizontalDiff = e2.getX()-e1.getX();
float verticalDiff = e2.getY() - e1.getY();
// calulate the abs values
float absHDiff = Math.abs(horizontalDiff);
float absVDiff = Math.abs(verticalDiff);
float absVelocityX = Math.abs(velocityX);
float absVelocityY = Math.abs(velocityY);
// now of hor distance > vertival distance , move back or forward
if(absHDiff>absVDiff && absHDiff>flingMin && absVelocityX> velocityMin){
// swiping forwad
if(horizontalDiff>0) {
moveToPreviousDive=true;
Toast.makeText(getApplicationContext(), "BACKWARD GESTURE DETECTED", Toast.LENGTH_LONG).show();
Log.d(TAG, "SWIPE HORIZONTAL DETECTED BACKWARD");
}else{
moveToNextDive=true;
Toast.makeText(getApplicationContext(), "FORWARD GESTURE DETECTED", Toast.LENGTH_LONG).show();
Log.d(TAG, "SWIPE HORIZONTAL FORWAD DETECTED BACKWARD");
}
}// outer ifelse if(absVDiff>flingMin && absVelocityY>velocityMin){
else if(absVDiff>flingMin && absVelocityY>velocityMin){
// vertical swipe detected
if(verticalDiff>0) {
moveToPreviousDive=true;
Toast.makeText(getApplicationContext(), "VERTICAL BACKWARD GESTURE DETECTED", Toast.LENGTH_LONG).show();
Log.d(TAG, "SWIPE VERTICAL DETECTED BACKWARD");
}
else{
moveToNextDive=true;
Log.d(TAG, "SWIPE VERTICAL FORWARD DETECTED BACKWARD");
Toast.makeText(getApplicationContext(), "VERTICAL FORWARD GESTURE DETECTED", Toast.LENGTH_LONG).show();
}
}
return true;
}
@Override
public boolean onDown(MotionEvent e) {
// Returning true tells the operating system that your code
// is interested in the remaining gesture events.
Log.d(TAG, "ON DOWN INNER CLASS 1010");
return true;
}
得到它，滚动视图将注册所有的触摸事件，所以你需要通过重写活动disptachTouchEvent将它们发送到手势探测器对象...希望这可以帮助任何人在相同的情况..
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
// must use this to pass event on to Gesture object from scrollvoew n xml
super.dispatchTouchEvent(ev);
return this.gestureDetectorObject.onTouchEvent(ev);
}