如何检测 Android 中的向左或向右滑动？

Question

我在 android 中有一个EditText视图。 在此我想检测向左或向右滑动。 我可以使用下面的代码在空白处获取它。 但是，当我在EditText上滑动时，这不起作用。 我怎么做？ 如果我做错了什么，请告诉我。 谢谢你。

使用的代码：

switch (touchevent.getAction())
{
    case MotionEvent.ACTION_DOWN:
    {
        oldTouchValue = touchevent.getX();
        break;
    }
    case MotionEvent.ACTION_UP:
    {
        float currentX = touchevent.getX();
        if (oldTouchValue < currentX)
        {
            // swiped left
        }
        if (oldTouchValue > currentX )
        {
            swiped right
        }
    break;
    }
}

Answer 1

最简单的从左到右滑动检测器：

在您的活动 class 添加以下属性：

private float x1,x2;
static final int MIN_DISTANCE = 150;

并覆盖onTouchEvent()方法：

@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);        
}

Answer 2

我喜欢来自@user2999943 的代码。 但只是为了我自己的目的而做的一些小改动。

@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);       
}

Answer 3

这是我使用的一个可爱的 class （如果我想在 View 上捕获事件，如果它是 ViewGroup，我使用第二个实现）：

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.onLeftToRightSwipe();
                        return true;
                    }
                    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.onTopToBottomSwipe();
                    return true; 
                    }
                    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
    }

}

这是一个使用示例：

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();
        }
    });

---

在某些情况下，您希望检测容器上的滑动手势并将触摸事件传递给子项，因此在这种情况下，您可以创建一个自定义视图组，比如 RelativeLayout 并覆盖 onInterceptTouchEvent，然后您就可以检测到滑动事件在不阻止触摸事件传递给您的子视图的情况下，例如：

    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<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;
    }
}

Answer 4

Swipe 事件是一种onTouch事件。 简单地简化@Gal Rom 的答案，只需跟踪垂直和水平增量，通过一些数学运算，您就可以确定 touchEvent 的滑动类型。 （再次，让我强调这是基于先前的答案，但简单性可能会吸引新手）。 这个想法是扩展一个 OnTouchListener，检测刚刚发生的滑动（触摸）类型，并为每种类型调用特定的方法。

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.onLeftToRightSwipe();
                            return true;
                        }
                        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.onTopToBottomSwipe();
                            return true;
                        }
                        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();
    }
}

Answer 5

我写了一个简单的 class 可以很容易地检测到滑动事件 - 顶部、右侧、底部、左侧。

1：检测单次滑动事件

// 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：通过一个回调检测任何滑动事件。

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
    }
});

这是一篇关于如何使用的博客文章： http://bmutinda.com/android-detect-swipe-events/

我还为此处提供的代码片段创建了一个要点： https://gist.github.com/bmutinda/9578f70f1df9bd0687b8

谢谢。

Answer 6

从左到右和从右到左滑动检测器

首先，声明两个浮点数据类型的变量。

private float x1, x2;

其次，在 java 中连接您的 xml 视图。 就像我有ImageView

ImageView img = (ImageView) findViewById(R.id.imageView);

第三，在您的setOnTouchListener上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,
                                        "Right to Left swipe",
                                        Toast.LENGTH_SHORT).show();
                            }else if(deltaX >0){
                                Toast.makeText(MainActivity.this,
                                        "Left to Right swipe",
                                        Toast.LENGTH_SHORT).show();
                            }
                            break;
                        }

                        return false;
                    }
                });

Answer 7

我想添加部分有效的已接受答案，但缺少时间变量，这使其完美。

具有时间变量的最简单的从左到右滑动检测器：

在您的活动 class 添加以下属性：

private float x1,x2;
private long startClickTime;
static final int MIN_DISTANCE = 150;
static final int MAX_SWIPE_TIME = 200;

并覆盖 onTouchEvent () 方法：

    @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 < MAX_SWIPE_TIME)
                {
                    Toast.makeText(this, "left2right swipe", Toast.LENGTH_SHORT).show ();
                }
                else
                {
                    // consider as something else - a screen tap for example
                }
                break;
        }
        return super.onTouchEvent(event);
    }

Answer 8

我想你想要的叫做一扔。 MotionEvents 可用于确定投掷的方向。

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

Answer 9

您应该从View.OnTouchListener并通过覆盖它来处理onTouch方法。

interface SwipeListener {
    fun onSwipeLeft()
    fun onSwipeRight()
}

class SwipeGestureListener internal constructor(
    private val listener: SwipeListener,
    private val minDistance: Int = DEFAULT_SWIPE_MIN_DISTANCE
) : View.OnTouchListener {
    companion object {
        const val DEFAULT_SWIPE_MIN_DISTANCE = 200
    }

    private var anchorX = 0F

    override fun onTouch(view: View, event: MotionEvent): Boolean {
        when (event.action) {
            MotionEvent.ACTION_DOWN -> {
                anchorX = event.x
                return true
            }
            MotionEvent.ACTION_UP -> {
                if (abs(event.x - anchorX) > minDistance) {
                    if (event.x > anchorX) {
                        listener.onSwipeRight()
                    } else {
                        listener.onSwipeLeft()
                    }
                }
                return true
            }
        }
        return view.performClick()
    }
}

您可以在Activity或Fragment中轻松实现它。

class MainActivity : AppCompatActivity(), SwipeListener {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        viewGroup.setOnTouchListener(SwipeGestureListener(this))
    }

    override fun onSwipeLeft() {
        Toast.makeText(this, "Swipe Left", Toast.LENGTH_SHORT).show()
    }

    override fun onSwipeRight() {
        Toast.makeText(this, "Swipe Right", Toast.LENGTH_SHORT).show()
    }
}

Answer 10

检测四个方向的滑动

private float x1,x2,y1,y2;
static final int MIN_DISTANCE = 70;

和

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;   
     }          

Answer 11

如果您想从滑动开始捕获事件，您可以使用 MotionEvent.ACTION_MOVE 并存储第一个值进行比较

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;
                                    }
                                    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;
                                    }
                                    if (deltaY > 0) {

                                        return false;
                                    }
                                } else {
                                    //not long enough swipe...
                                    return false;
                                }
                            }
                        }
                        return false;
                    }
                    case MotionEvent.ACTION_UP: {
                        isTouchCaptured = false;
                    }
                }
                return false;

            }
        });

Answer 12

这应该可以帮助你也许......

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);
    }
};

Answer 13

经过一整天的时间研究此功能终于能够得到正确的答案。

首先，创建以下类：

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<10 && deltaX<0 || deltaY==0 && deltaX>-15 && deltaX<0){
                    Log.i(logTag,"to right");
                }if (deltaY>=0 && deltaY<10 && deltaX>0 || deltaY<0 && deltaX>15 && deltaX<40){
                Log.i(logTag,"to left");
            }





                if (Math.abs(deltaX) > MIN_DISTANCE) {
                    // left or right
                    if (deltaX < 0) {
                        mSwipeDetected = Action.LR;
                        return false;
                    }
                    if (deltaX > 0) {


                        mSwipeDetected = Action.RL;
                        return false;
                    }
                } else if (Math.abs(deltaY) > MIN_DISTANCE) {


                    if (deltaY < 0) {
                        Log.i(logTag,"to bottom");
                        mSwipeDetected = Action.TB;
                        return false;
                    }
                    if (deltaY > 0) {
                        Log.i(logTag,"to up");
                        mSwipeDetected = Action.BT;
                        return false;
                    }
                }
                return true;
        }
        return false;
    }
}

最后在你要申请的object上。 我的例子：

SwipeDetector swipeDetector = new SwipeDetector();
listView.setOnTouchListener(swipeDetector);

祝你好运。

Answer 14

这是使用数据绑定的 kotlin 中任何视图的通用向左滑动检测器

@BindingAdapter("onSwipeLeft")
fun View.setOnSwipeLeft(runnable: Runnable) {
    setOnTouchListener(object : View.OnTouchListener {
        var x0 = 0F; var y0 = 0F; var t0 = 0L
        val defaultClickDuration = 200

        override fun onTouch(v: View?, motionEvent: MotionEvent?): Boolean {
            motionEvent?.let { event ->
                when(event.action) {
                    MotionEvent.ACTION_DOWN -> {
                        x0 = event.x; y0 = event.y; t0 = System.currentTimeMillis()
                    }
                    MotionEvent.ACTION_UP -> {
                        val x1 = event.x; val y1 = event.y; val t1 = System.currentTimeMillis()

                        if (x0 == x1 && y0 == y1 && (t1 - t0) < defaultClickDuration) {
                            performClick()
                            return false
                        }
                        if (x0 > x1) { runnable.run() }
                    }
                    else -> {}
                }
            }
            return true
        }
    })
}

然后在你的布局中使用它：

app:onSwipeLeft="@{() -> viewModel.swipeLeftHandler()}"

Answer 15

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, "Left to Right Swap Performed", Toast.LENGTH_LONG).show();
                }

                // if right to left 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, "UP to Down Swap Performed", Toast.LENGTH_LONG).show();
                }

                //if Down to UP sweep event on screen
                if (y1 > y2)
                {
                    Toast.makeText(this, "Down to UP Swap Performed", Toast.LENGTH_LONG).show();
                }
                break;
            }
        }
        return false;
    }

Answer 16

最好的答案是@Gal Rom 的。 关于它的更多信息：触摸事件首先返回子视图。 如果您为它们定义 onClick 或 onTouch 侦听器，则父视图（例如片段）将不会收到任何触摸侦听器。 所以如果你想在这种情况下为片段定义滑动监听器，你必须在一个新的 class 中实现它：

    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(deltaX<0)
                    {
                        result=true;
                        if(mSwipeDetectedListener!=null)
                            mSwipeDetectedListener.swipeLeftDetected();

                    }else if(deltaX>0){
                        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;
    }
}

我更改了@Gal Rom 的 class。 所以它可以检测左右滑动，特别是它在检测后返回 onInterceptTouchEvent true。 这很重要，因为如果我们有时不这样做，子视图可能会收到事件，并且 Swipe 用于片段和 onClick 用于子视图（例如）运行并导致一些问题。 制作此 class 后，您必须更改片段 xml 文件：

    <com.neganet.QRelations.fragments.SwipeListenerFragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:id="@+id/main_list_layout"
    android:clickable="true"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:layout_height="match_parent" tools:context="com.neganet.QRelations.fragments.mainList"
    android:background="@color/main_frag_back">

    <!-- TODO: Update blank fragment layout -->
    <android.support.v7.widget.RecyclerView
        android:id="@+id/farazList"
        android:scrollbars="horizontal"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="left|center_vertical" />
</com.neganet.QRelations.fragments.SwipeListenerFragment>

您会看到开始标签是我们制作的 class。 现在在片段 class 中：

            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();
    }

这有点复杂，但效果很好:)

Answer 17

简短易懂的版本：

1.首先创建这个抽象class

public abstract class HorizontalSwipeListener implements View.OnTouchListener {

    private float firstX;
    private int minDistance;

    HorizontalSwipeListener(int minDistance) {
        this.minDistance = minDistance;
    }

    abstract void onSwipeRight();

    abstract void onSwipeLeft();

    @Override
    public boolean onTouch(View view, MotionEvent event) {

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                firstX = event.getX();
                return true;
            case MotionEvent.ACTION_UP:
                float secondX = event.getX();
                if (Math.abs(secondX - firstX) > minDistance) {
                    if (secondX > firstX) {
                        onSwipeLeft();
                    } else {
                        onSwipeRight();
                    }
                }
                return true;
        }
        return view.performClick();
    }

}

2.然后创建一个具体的 class 实现你需要的东西：

public class SwipeListener extends HorizontalSwipeListener {

    public SwipeListener() {
        super(200);
    }

    @Override
    void onSwipeRight() {
        System.out.println("right");
    }

    @Override
    void onSwipeLeft() {
        System.out.println("left");
    }

}