Bu, kullandığım sevimli bir sınıftır (bir View'da olay yakalamak istediğim durumlarda, bu bir ViewGroup ise, ikinci uygulamayı kullanırım):
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
public class SwipeDetector implements View.OnTouchListener{
private int min_distance = 100;
private float downX, downY, upX, upY;
private View v;
private onSwipeEvent swipeEventListener;
public SwipeDetector(View v){
this.v=v;
v.setOnTouchListener(this);
}
public void setOnSwipeListener(onSwipeEvent listener)
{
try{
swipeEventListener=listener;
}
catch(ClassCastException e)
{
Log.e("ClassCastException","please pass SwipeDetector.onSwipeEvent Interface instance",e);
}
}
public void onRightToLeftSwipe(){
if(swipeEventListener!=null)
swipeEventListener.SwipeEventDetected(v,SwipeTypeEnum.RIGHT_TO_LEFT);
else
Log.e("SwipeDetector error","please pass SwipeDetector.onSwipeEvent Interface instance");
}
public void onLeftToRightSwipe(){
if(swipeEventListener!=null)
swipeEventListener.SwipeEventDetected(v,SwipeTypeEnum.LEFT_TO_RIGHT);
else
Log.e("SwipeDetector error","please pass SwipeDetector.onSwipeEvent Interface instance");
}
public void onTopToBottomSwipe(){
if(swipeEventListener!=null)
swipeEventListener.SwipeEventDetected(v,SwipeTypeEnum.TOP_TO_BOTTOM);
else
Log.e("SwipeDetector error","please pass SwipeDetector.onSwipeEvent Interface instance");
}
public void onBottomToTopSwipe(){
if(swipeEventListener!=null)
swipeEventListener.SwipeEventDetected(v,SwipeTypeEnum.BOTTOM_TO_TOP);
else
Log.e("SwipeDetector error","please pass SwipeDetector.onSwipeEvent Interface instance");
}
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;
if(Math.abs(deltaX) > Math.abs(deltaY))
{
if(Math.abs(deltaX) > min_distance){
if(deltaX < 0)
{
this.onLeftToRightSwipe();
return true;
}
if(deltaX > 0) {
this.onRightToLeftSwipe();
return true;
}
}
else {
return false;
}
}
else
{
if(Math.abs(deltaY) > min_distance){
if(deltaY < 0)
{ this.onTopToBottomSwipe();
return true;
}
if(deltaY > 0)
{ this.onBottomToTopSwipe();
return true;
}
}
else {
return false;
}
}
return true;
}
}
return false;
}
public interface onSwipeEvent
{
public void SwipeEventDetected(View v, SwipeTypeEnum SwipeType);
}
public SwipeDetector setMinDistanceInPixels(int min_distance)
{
this.min_distance=min_distance;
return this;
}
public enum SwipeTypeEnum
{
RIGHT_TO_LEFT,LEFT_TO_RIGHT,TOP_TO_BOTTOM,BOTTOM_TO_TOP
}
}
ve bu bir kullanım örneğidir:
filters_container=(RelativeLayout)root.findViewById(R.id.filters_container);
new SwipeDetector(filters_container).setOnSwipeListener(new SwipeDetector.onSwipeEvent() {
@Override
public void SwipeEventDetected(View v, SwipeDetector.SwipeTypeEnum swipeType) {
if(swipeType==SwipeDetector.SwipeTypeEnum.LEFT_TO_RIGHT)
getActivity().onBackPressed();
}
});
Bazı durumlarda, bir kaptaki kaydırma hareketlerini algılamak ve dokunma Olaylarını çocuklara aktarmak istersiniz, böylece bu durumda bir Özel Görünüm grubu oluşturabilir, RelativeLayout diyelim ve onInterceptTouchEvent'i geçersiz kılabilirsiniz ve orada kaydırma olayını algılayabilirsiniz. Dokunma Etkinliğinin çocuğunuzun görünümlerine geçişini engellemeden, örneğin:
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.RelativeLayout;
public class SwipeDetectRelativeLayout extends RelativeLayout {
private float x1,x2;
static final int MIN_DISTANCE=150;
private onSwipeEventDetected mSwipeDetectedListener;
public SwipeDetectRelativeLayout(Context context) {
super(context);
}
public SwipeDetectRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SwipeDetectRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
switch(ev.getAction())
{
case MotionEvent.ACTION_DOWN:
x1 = ev.getX();
break;
case MotionEvent.ACTION_UP:
x2 = ev.getX();
float deltaX = x2 - x1;
if (Math.abs(deltaX) > MIN_DISTANCE)
{
if(deltaX<0)
{
if(mSwipeDetectedListener!=null)
mSwipeDetectedListener.swipeEventDetected();
}
}
break;
}
return super.onInterceptTouchEvent(ev);
}
public interface onSwipeEventDetected
{
public void swipeEventDetected();
}
public void registerToSwipeEvents(onSwipeEventDetected listener)
{
this.mSwipeDetectedListener=listener;
}
}