可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):
问题:
I have a edittext view in android. On this I want to detect a swipe left or right. I am able to get it on a empty space with the below code. But this does not work when I swipe on a edittext. How do i do it? Please let me know If I am doing something wrong. Thank you.
Code Used
switch (touchevent.getAction()) { case MotionEvent.ACTION_DOWN: { oldTouchValue = touchevent.getX(); break; } case MotionEvent.ACTION_UP: { float currentX = touchevent.getX(); if (oldTouchValue currentX ) { swiped right } break; } }
回答1:
Simplest left to right swipe detector:
In your activity class add following attributes:
private float x1,x2; static final int MIN_DISTANCE = 150;
and override onTouchEvent() method:
@Override public boolean onTouchEvent(MotionEvent event) { switch(event.getAction()) { case MotionEvent.ACTION_DOWN: x1 = event.getX(); break; case MotionEvent.ACTION_UP: x2 = event.getX(); float deltaX = x2 - x1; if (Math.abs(deltaX) > MIN_DISTANCE) { Toast.makeText(this, "left2right swipe", Toast.LENGTH_SHORT).show (); } else { // consider as something else - a screen tap for example } break; } return super.onTouchEvent(event); }
回答2:
I like the code from @user2999943. But just some minor changes for my own purposes.
@Override public boolean onTouchEvent(MotionEvent event) { switch(event.getAction()) { case MotionEvent.ACTION_DOWN: x1 = event.getX(); break; case MotionEvent.ACTION_UP: x2 = event.getX(); float deltaX = x2 - x1; if (Math.abs(deltaX) > MIN_DISTANCE) { // Left to Right swipe action if (x2 > x1) { Toast.makeText(this, "Left to Right swipe [Next]", Toast.LENGTH_SHORT).show (); } // Right to left swipe action else { Toast.makeText(this, "Right to Left swipe [Previous]", Toast.LENGTH_SHORT).show (); } } else { // consider as something else - a screen tap for example } break; } return super.onTouchEvent(event); }
回答3:
This is a cute class I use (in cases I want to catch event on a View, if it is a ViewGroup, I use the second implementation):
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; //HORIZONTAL SCROLL if(Math.abs(deltaX) > Math.abs(deltaY)) { if(Math.abs(deltaX) > min_distance){ // left or right if(deltaX 0) { this.onRightToLeftSwipe(); return true; } } else { //not long enough swipe... return false; } } //VERTICAL SCROLL else { if(Math.abs(deltaY) > min_distance){ // top or down if(deltaY 0) { this.onBottomToTopSwipe(); return true; } } else { //not long enough swipe... 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 } }
and this is a use example:
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(); } });
In some cases you would like to detect the swipe gestures on a container and pass down the touch Events to the childs so in that case you can create a Custom View group, lets say RelativeLayout and override onInterceptTouchEvent , and there you can detect the swipe event without blocking the pass of Touch Event to your child views,for Example:
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) { //swiping right to left if(deltaX
回答4:
Swipe events are a kind of onTouch events. Simply simplifying @Gal Rom 's answer, just keep track of the vertical an horizontal deltas, and with a little math you can determine what kind of swipe a touchEvent was. (Again, let me stress that this was OBSENELY based to a previous answer, but the simplicity may appeal to novices). The idea is to extend an OnTouchListener, detect what kind of swipe (touch) just happened and call specific methods for each kind.
public class SwipeListener implements View.OnTouchListener { private int min_distance = 100; private float downX, downY, upX, upY; View v; @Override public boolean onTouch(View v, MotionEvent event) { this.v = v; switch(event.getAction()) { // Check vertical and horizontal touches 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; //HORIZONTAL SCROLL if (Math.abs(deltaX) > Math.abs(deltaY)) { if (Math.abs(deltaX) > min_distance) { // left or right if (deltaX 0) { this.onRightToLeftSwipe(); return true; } } else { //not long enough swipe... return false; } } //VERTICAL SCROLL else { if (Math.abs(deltaY) > min_distance) { // top or down if (deltaY 0) { this.onBottomToTopSwipe(); return true; } } else { //not long enough swipe... return false; } } return false; } } return false; } public void onLeftToRightSwipe(){ Toast.makeText(v.getContext(),"left to right", Toast.LENGTH_SHORT).show(); } public void onRightToLeftSwipe() { Toast.makeText(v.getContext(),"right to left", Toast.LENGTH_SHORT).show(); } public void onTopToBottomSwipe() { Toast.makeText(v.getContext(),"top to bottom", Toast.LENGTH_SHORT).show(); } public void onBottomToTopSwipe() { Toast.makeText(v.getContext(),"bottom to top", Toast.LENGTH_SHORT).show(); } }
回答5:
I wrote a simple class that makes it easy to detect the swipe events - TOP, RIGHT, BOTTOM, LEFT.
1: Detect single swipe event
// Detect and consume specific events // {Available methods} - detectTop, detectRight, detectBottom, detectLeft SwipeEvents.detectTop(swipeElement, new SwipeEvents.SwipeSingleCallback() { @Override public void onSwipe() { showToast("Swiped - detectTop"); } });
2: Detect any of the swipe events with one callback.
SwipeEvents.detect( swipeElement, new SwipeEvents.SwipeCallback() { @Override public void onSwipeTop() { //Swiped top } @Override public void onSwipeRight() { //Swiped right } @Override public void onSwipeBottom() { //Swiped bottom } @Override public void onSwipeLeft() { //Swiped left } });
Here is a blog post with the explanation on how to use: http://bmutinda.com/android-detect-swipe-events/
I have also created a Gist for the code snippets available here: https://gist.github.com/bmutinda/9578f70f1df9bd0687b8
Thanks.
回答6:
Left to Right and Right to Left Swipe Detector
Firstly, declare two variable of float datatype.
private float x1, x2;
Secondly, wireup your xml view in java. Like I have ImageView
ImageView img = (ImageView) findViewById(R.id.imageView);
Thirdly, setOnTouchListener on your ImageView.
img.setOnTouchListener( new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub switch (event.getAction()) { case MotionEvent.ACTION_DOWN: x1 = event.getX(); break; case MotionEvent.ACTION_UP: x2 = event.getX(); float deltaX = x2 - x1; if (deltaX 0){ Toast.makeText(MainActivity.this, "Left to Right swipe", Toast.LENGTH_SHORT).show(); } break; } return false; } });
回答7:
I want to add on to the accepted answer which works partially, but is missing the time variable, that makes it perfect.
Simplest left to right swipe detector with a time variable:
In your activity class add following attributes:
private float x1,x2; private long startClickTime; static final int MIN_DISTANCE = 150; static final int MAX_SWIPE_TIME = 200;
and override onTouchEvent () method:
@Override public boolean onTouchEvent(MotionEvent event) { switch(event.getAction()) { case MotionEvent.ACTION_DOWN: startClickTime = Calendar.getInstance().getTimeInMillis(); x1 = event.getX(); break; case MotionEvent.ACTION_UP: long clickDuration = Calendar.getInstance().getTimeInMillis() - startClickTime; x2 = event.getX(); float deltaX = x2 - x1; if (Math.abs(deltaX) > MIN_DISTANCE && clickDuration
回答8:
Detect swipe in four direction
private float x1,x2,y1,y2; static final int MIN_DISTANCE = 70;
and
switch(pSceneTouchEvent.getAction()) { case MotionEvent.ACTION_DOWN: x1 = pSceneTouchEvent.getX(); y1 = pSceneTouchEvent.getY(); break; case MotionEvent.ACTION_UP: x2 = pSceneTouchEvent.getX(); y2 = pSceneTouchEvent.getY(); float deltaX = x2 - x1; float deltaY = y2 - y1; if (deltaX > MIN_DISTANCE) { swipeLeftToRight(); } else if( Math.abs(deltaX) > MIN_DISTANCE) { swipeRightToLeft(); } else if(deltaY > MIN_DISTANCE){ swipeTopToBottom(); } else if( Math.abs(deltaY) > MIN_DISTANCE){ swipeBottopmToTop(); } break; }
回答9:
I think what you want is called a fling. The MotionEvents can be used to determine the direction of the fling.
public class MainActivity extends Activity implements GestureDetector.OnGestureListener { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.stellar_layout); mDetector = new GestureDetectorCompat(this, this); } @Override public boolean onFling(MotionEvent event1, MotionEvent event2, float velocityX, float velocityY) { Log.d(tag, "onFling:\n " + event1.toString()+ "\n " + event2.toString()); /* prints the following MotionEvent { action=ACTION_DOWN, id[0]=0, x[0]=297.0, y[0]=672.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=488341979, downTime=488341979, deviceId=6, source=0x1002 } MotionEvent { action=ACTION_UP, id[0]=0, x[0]=560.0, y[0]=583.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=488342047, downTime=488341979, deviceId=6, source=0x1002 } */ return true; } }
http://developer.android.com/training/gestures/detector.html
回答10:
public class TransferMarket extends Activity { float x1,x2; float y1, y2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_transfer_market); } // onTouchEvent () method gets called when User performs any touch event on screen // Method to handle touch event like left to right swap and right to left swap public boolean onTouchEvent(MotionEvent touchevent) { switch (touchevent.getAction()) { // when user first touches the screen we get x and y coordinate case MotionEvent.ACTION_DOWN: { x1 = touchevent.getX(); y1 = touchevent.getY(); break; } case MotionEvent.ACTION_UP: { x2 = touchevent.getX(); y2 = touchevent.getY(); //if left to right sweep event on screen if (x1 x2) { Toast.makeText(this, "Right to Left Swap Performed", Toast.LENGTH_LONG).show(); } // if UP to Down sweep event on screen if (y1 y2) { Toast.makeText(this, "Down to UP Swap Performed", Toast.LENGTH_LONG).show(); } break; } } return false; }
回答11:
the best answer is @Gal Rom 's. there is more information about it: touch event return's to child views first. and if you define onClick or onTouch listener for them, parnt view (for example fragment) will not receive any touch listener. So if you want define swipe listener for fragment in this situation, you must implement it in a new class:
package com.neganet.QRelations.fragments; import android.content.Context; import android.util.AttributeSet; import android.view.MotionEvent; import android.widget.FrameLayout; public class SwipeListenerFragment extends FrameLayout { private float x1,x2; static final int MIN_DISTANCE=150; private onSwipeEventDetected mSwipeDetectedListener; public SwipeListenerFragment(Context context) { super(context); } public SwipeListenerFragment(Context context, AttributeSet attrs) { super(context, attrs); } public SwipeListenerFragment(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { boolean result=false; 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(deltaX0){ result=true; if(mSwipeDetectedListener!=null) mSwipeDetectedListener.swipeRightDetected(); } } break; } return result; } public interface onSwipeEventDetected { public void swipeLeftDetected(); public void swipeRightDetected(); } public void registerToSwipeEvents(onSwipeEventDetected listener) { this.mSwipeDetectedListener=listener; } }
I changed @Gal Rom 's class. So it can detect both right and left swipe and specially it returns onInterceptTouchEvent true after detect. its important because if we dont do it some times child views maybe receive event and both of Swipe for fragment and onClick for child view (for example) runs and cause some issues. after making this class, you must change your fragment xml file:
you see that begin tag is the class that we made. now in fragment class:
View view=inflater.inflate(R.layout.fragment_main_list, container, false); SwipeListenerFragment tdView=(SwipeListenerFragment) view; tdView.registerToSwipeEvents(this); and then Implement SwipeListenerFragment.onSwipeEventDetected in it: @Override public void swipeLeftDetected() { Toast.makeText(getActivity(), "left", Toast.LENGTH_SHORT).show(); } @Override public void swipeRightDetected() { Toast.makeText(getActivity(), "right", Toast.LENGTH_SHORT).show(); }
It's a little complicated but works perfect :)
回答12:
If you want to catch the event from the starting of the swipe you can use MotionEvent.ACTION_MOVE and store the first value to compare
private float upX1; private float upX2; private float upY1; private float upY2; private boolean isTouchCaptured = false; static final int min_distance = 100; viewObject.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_MOVE: { downX = event.getX(); downY = event.getY(); if (!isTouchCaptured) { upX1 = event.getX(); upY1 = event.getY(); isTouchCaptured = true; } else { upX2 = event.getX(); upY2 = event.getY(); float deltaX = upX1 - upX2; float deltaY = upY1 - upY2; //HORIZONTAL SCROLL if (Math.abs(deltaX) > Math.abs(deltaY)) { if (Math.abs(deltaX) > min_distance) { // left or right if (deltaX 0) { return true; } } else { //not long enough swipe... return false; } } //VERTICAL SCROLL else { if (Math.abs(deltaY) > min_distance) { // top or down if (deltaY 0) { return false; } } else { //not long enough swipe... return false; } } } return false; } case MotionEvent.ACTION_UP: { isTouchCaptured = false; } } return false; } });
回答13:
this should help you maybe...
private final GestureDetector.SimpleOnGestureListener onGestureListener = new GestureDetector.SimpleOnGestureListener() { @Override public boolean onDoubleTap(MotionEvent e) { Log.i("gestureDebug333", "doubleTapped:" + e); return super.onDoubleTap(e); } @Override public boolean onDoubleTapEvent(MotionEvent e) { Log.i("gestureDebug333", "doubleTappedEvent:" + e); return super.onDoubleTapEvent(e); } @Override public boolean onDown(MotionEvent e) { Log.i("gestureDebug333", "onDown:" + e); return super.onDown(e); } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { Log.i("gestureDebug333", "flinged:" + e1 + "---" + e2); Log.i("gestureDebug333", "fling velocity:" + velocityX + "---" + velocityY); if (e1.getAction() == MotionEvent.ACTION_DOWN && e1.getX() > (e2.getX() + 300)){ // Toast.makeText(context, "flinged right to left", Toast.LENGTH_SHORT).show(); goForward(); } if (e1.getAction() == MotionEvent.ACTION_DOWN && e2.getX() > (e1.getX() + 300)){ //Toast.makeText(context, "flinged left to right", Toast.LENGTH_SHORT).show(); goBack(); } return super.onFling(e1, e2, velocityX, velocityY); } @Override public void onLongPress(MotionEvent e) { super.onLongPress(e); } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { return super.onScroll(e1, e2, distanceX, distanceY); } @Override public void onShowPress(MotionEvent e) { super.onShowPress(e); } @Override public boolean onSingleTapConfirmed(MotionEvent e) { return super.onSingleTapConfirmed(e); } @Override public boolean onSingleTapUp(MotionEvent e) { return super.onSingleTapUp(e); } };
回答14:
After a full day working on this feature finally able to get the right answer.
First, create the following classes:
import android.util.Log; import android.view.MotionEvent; import android.view.View; /** * Created by hoshyar on 1/19/17. */ public class SwipeDetector implements View.OnTouchListener { public static enum Action { LR, // Left to Right RL, // Right to Left TB, // Top to bottom BT, // Bottom to Top None // when no action was detected } private static final String logTag = "Swipe"; private static final int MIN_DISTANCE = 100; private float downX, downY, upX, upY; private Action mSwipeDetected = Action.None; public boolean swipeDetected() { return mSwipeDetected != Action.None; } public Action getAction() { return mSwipeDetected; } @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: downX = event.getX(); downY = event.getY(); mSwipeDetected = Action.None; return false; case MotionEvent.ACTION_MOVE: upX = event.getX(); upY = event.getY(); float deltaX = downX - upX; float deltaY = downY - upY; Log.i(logTag,String.valueOf(deltaX)); Log.i(logTag,String.valueOf(deltaX)); if (deltaY>0 && deltaY-15 && deltaX=0 && deltaY0 || deltaY15 && deltaX MIN_DISTANCE) { // left or right if (deltaX 0) { mSwipeDetected = Action.RL; return false; } } else if (Math.abs(deltaY) > MIN_DISTANCE) { if (deltaY 0) { Log.i(logTag,"to up"); mSwipeDetected = Action.BT; return false; } } return true; } return false; } }
Finally on the object that you want to apply. My example:
SwipeDetector swipeDetector = new SwipeDetector(); listView.setOnTouchListener(swipeDetector);
Good luck .
