3
我希望你能幫助我弄清楚爲什麼OnSwipe，OnDoubleTap和onSingTapConfirmed方法在我的CustomView類中的定義從活動中實例化的onCreate使用以下行 -姿態探測器與一個基於視圖的自定義類
CustomView customView = new CustomView(this);
沒有被調用。 CustomView擴展了View並實現了MyGestureListener接口。見下面的代碼。
public class CustomView extends View implements MyGestureListener {
private MyGestureDetector mGestureDetector;
public CustomView(Context context) {
super(context);
mGestureDetector = new MyGestureDetector(context, this);
}
@Override
public boolean dispatchTouchEvent(MotionEvent me){
this.mGestureDetector.onTouchEvent(me);
return super.dispatchTouchEvent(me);
}
@Override
public void onSwipe(int direction) {
String str = "";
switch (direction) {
case MyGestureDetector.SWIPE_RIGHT :
str = "Swipe Right";
break;
case MyGestureDetector.SWIPE_LEFT :
str = "Swipe Left";
break;
case MyGestureDetector.SWIPE_DOWN :
str = "Swipe Down";
break;
case MyGestureDetector.SWIPE_UP :
str = "Swipe Up";
break;
}
Toast.makeText(getContext(), str, Toast.LENGTH_SHORT).show();
}
@Override
public void onDoubleTap() {
Toast.makeText(getContext(), "Double Tap", Toast.LENGTH_SHORT).show();
}
@Override
public void onSingleTapConfirmed() {
Toast.makeText(getContext(), "Single Tap", Toast.LENGTH_SHORT).show();
}
}
public class MyGestureDetector extends GestureDetector.SimpleOnGestureListener{
public final static int SWIPE_UP = 1;
public final static int SWIPE_DOWN = 2;
public final static int SWIPE_LEFT = 3;
public final static int SWIPE_RIGHT = 4;
public final static int MODE_TRANSPARENT = 0;
public final static int MODE_SOLID = 1;
public final static int MODE_DYNAMIC = 2;
private final static int ACTION_FAKE = -13;
private int swipe_Min_Distance = 100;
private int swipe_Max_Distance = 350;
private int swipe_Min_Velocity = 100;
private int mode = MODE_TRANSPARENT;
private boolean running = true;
private boolean tapIndicator = false;
private Context context;
private GestureDetector detector;
private MyGestureListener listener;
public MyGestureDetector(Context context, MyGestureListener sgl) {
this.context = context;
this.detector = new GestureDetector(context, this);
this.listener = sgl;
}
public void onTouchEvent(MotionEvent event){
if(!this.running)
return;
boolean result = this.detector.onTouchEvent(event);
if(this.mode == MODE_SOLID)
event.setAction(MotionEvent.ACTION_CANCEL);
else if (this.mode == MODE_DYNAMIC) {
if(event.getAction() == ACTION_FAKE)
event.setAction(MotionEvent.ACTION_UP);
else if (result)
event.setAction(MotionEvent.ACTION_CANCEL);
else if(this.tapIndicator){
event.setAction(MotionEvent.ACTION_DOWN);
this.tapIndicator = false;
}
}
//else just do nothing, it's Transparent
}
public void setMode(int m){
this.mode = m;
}
public int getMode(){
return this.mode;
}
public void setEnabled(boolean status){
this.running = status;
}
public void setSwipeMaxDistance(int distance){
this.swipe_Max_Distance = distance;
}
public void setSwipeMinDistance(int distance){
this.swipe_Min_Distance = distance;
}
public void setSwipeMinVelocity(int distance){
this.swipe_Min_Velocity = distance;
}
public int getSwipeMaxDistance(){
return this.swipe_Max_Distance;
}
public int getSwipeMinDistance(){
return this.swipe_Min_Distance;
}
public int getSwipeMinVelocity(){
return this.swipe_Min_Velocity;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
final float xDistance = Math.abs(e1.getX() - e2.getX());
final float yDistance = Math.abs(e1.getY() - e2.getY());
if(xDistance > this.swipe_Max_Distance || yDistance > this.swipe_Max_Distance)
return false;
velocityX = Math.abs(velocityX);
velocityY = Math.abs(velocityY);
boolean result = false;
if(velocityX > this.swipe_Min_Velocity && xDistance > this.swipe_Min_Distance){
if(e1.getX() > e2.getX()) // right to left
this.listener.onSwipe(SWIPE_LEFT);
else
this.listener.onSwipe(SWIPE_RIGHT);
result = true;
}
else if(velocityY > this.swipe_Min_Velocity && yDistance > this.swipe_Min_Distance){
if(e1.getY() > e2.getY()) // bottom to up
this.listener.onSwipe(SWIPE_UP);
else
this.listener.onSwipe(SWIPE_DOWN);
result = true;
}
return result;
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
this.tapIndicator = true;
return false;
}
@Override
public boolean onDoubleTap(MotionEvent arg0) {
this.listener.onDoubleTap();
return true;
}
@Override
public boolean onDoubleTapEvent(MotionEvent arg0) {
return true;
}
@Override
public boolean onSingleTapConfirmed(MotionEvent arg0) {;
this.listener.onSingleTapConfirmed();
return true;
}
static interface MyGestureListener{
void onSwipe(int direction);
void onDoubleTap();
void onSingleTapConfirmed();
}
}