Android 手势拦截的实现(简化水平 垂直手势操作的拦截处理）

这是手势拦截类的源码。注释，也加的随地时，方便阅读理解。在源码后面，会有使用案例。

package com.laka.robotdog.widget;import android.content.Context;import android.view.MotionEvent;import android.view.View;import android.view.ViewConfiguration;/*** @Author Lyf* @CreateTime /3/26* @Description 手势拦截类。用于简化，拦截水平或垂直的手势。**/public class InterceptTouchListener implements View.OnTouchListener {// 上下文，建议用全局上下文// private Context mContext;// 按压到屏幕时的坐标private float[] mCoordinate;// 最小的滑动距离，不同手机不同private int mMinimumSlop;// 两个回调接口，当触发水平或垂直手势时，会被调用private OnHorizontalGestureListener mOnHorizontalGestureListener;private OnVerticalGestureListener mOnVerticalGestureListener;public InterceptTouchListener(Context mContext) {mCoordinate = new float[2];mMinimumSlop = ViewConfiguration.get(mContext).getScaledTouchSlop();}@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:// 保存按压到屏幕时的坐标setCoordinate(event);break;case MotionEvent.ACTION_MOVE:if (isClickEvent(event)) {// 不处理点击事件，因为部分机型的点击事件会触发ACTION_MOVE，所以这里要做过滤。break;} else {if (mOnHorizontalGestureListener != null&& isHorizontalGestureEvent(event)) {return mOnHorizontalGestureListener.onHorizontalGesture(event.getX(), mCoordinate[0]);}if (mOnVerticalGestureListener != null&& isVerticalGestureEvent(event)) {return mOnVerticalGestureListener.onVerticalGesture(event.getY(), mCoordinate[1]);}}break;case MotionEvent.ACTION_UP:break;}return false;}/*** @return return true 如果用户当前正在进行水平方向的手势操作*/private boolean isHorizontalGestureEvent(MotionEvent event) {float slopX = getSlopX(event);// 滑动距离，必须大于最小滑动距离。return slopX > mMinimumSlop && slopX >= getSlopY(event);}/*** @return return true 如果用户当前正在进行垂直方向的手势操作*/private boolean isVerticalGestureEvent(MotionEvent event) {float slopY = getSlopY(event);// 滑动距离，必须大于最小滑动距离。return slopY > mMinimumSlop && getSlopX(event) < slopY;}/*** @return return true 如果并没有移动，只是点击而已。*/private boolean isClickEvent(MotionEvent event) {return getSlopX(event) == 0 && getSlopY(event) == 0;}/*** 保存坐标*/private void setCoordinate(MotionEvent event) {mCoordinate[0] = event.getX();mCoordinate[1] = event.getY();}/*** @return 水平滑动的距离*/private float getSlopX(MotionEvent event) {return Math.abs(event.getX() - mCoordinate[0]);}/*** @return 垂直滑动的距离*/private float getSlopY(MotionEvent event) {return Math.abs(event.getY() - mCoordinate[1]);}public InterceptTouchListener setOnHorizontalGestureListener(OnHorizontalGestureListener mOnHorizontalGestureListener) {this.mOnHorizontalGestureListener = mOnHorizontalGestureListener;return this;}public InterceptTouchListener setOnVerticalGestureListener(OnVerticalGestureListener mOnVerticalGestureListener) {this.mOnVerticalGestureListener = mOnVerticalGestureListener;return this;}public interface OnHorizontalGestureListener {/*** 当用户在进行水平方向的操作时，该方法会被调用** @param currentX 当前的X坐标* @param lastX 上一次的X坐标* @return return true 如果要拦截事件。*/boolean onHorizontalGesture(float currentX, float lastX);}public interface OnVerticalGestureListener {/*** 当用户在进行垂直方向的操作时，该方法会被调用** @param currentY 当前的Y坐标* @param lastY 上一次的Y坐标* @return return true 如果要拦截事件。*/boolean onVerticalGesture(float currentY, float lastY);}}

使用案例

// 设置触摸事件，mDrawer可以是任意需要设置OnTouchListener的View.mDrawer.setOnTouchListener(new InterceptTouchListener(this).setOnHorizontalGestureListener(new InterceptTouchListener.OnHorizontalGestureListener() {@Overridepublic boolean onHorizontalGesture(float currentX, float lastX) {// 从左向右滑if (currentX - lastX > 0) {if (!mDrawer.isDrawerOpen(mDrawerContentView)) {mDrawer.openDrawer(Gravity.START);}} else {// 从右向左滑if (mDrawer.isDrawerOpen(mDrawerContentView)) {mDrawer.closeDrawer(Gravity.START);}}return true;}}));———————————————————————————————————Lambda语法版——————————————————————————————————————————————// Lambda语法版mDrawer.setOnTouchListener(new InterceptTouchListener(this).setOnHorizontalGestureListener((currX, lastX) -> {// 从左向右滑if (currX - lastX > 0) {if (!mDrawer.isDrawerOpen(mDrawerContentView)) {mDrawer.openDrawer(Gravity.START);}} else {// 从右向左滑if (mDrawer.isDrawerOpen(mDrawerContentView)) {mDrawer.closeDrawer(Gravity.START);}}return true;}));

从使用上，可以看出。这个类，简化了手势操作的判断。你可以把你的精力专注于：当水平或垂直事件，被触发时。你要做什么业务，以及需不需要拦截手势事件就行。下面是英文注释版本：

这是，英文注释版本：

package com.laka.robotdog.widget;import android.content.Context;import android.view.MotionEvent;import android.view.View;import android.view.ViewConfiguration;/*** @Author Lyf* @CreateTime /3/26* @Description An InterceptTouchListener is a class for intercepting Gestures.* For Instance, moving finger from top to down or from left to right on Screen.**/public class InterceptTouchListener implements View.OnTouchListener {// Context, It also can be an Application Context.// private Context mContext;// Coordinate of the point You pressed on Screen.private float[] mCoordinate;// Distance in pixels a touch can wander before we think the user is scrollingprivate int mMinimumSlop;// These interfaces definition for callback When the user vertically or horizontally moving his finger on the screen.private OnHorizontalGestureListener mOnHorizontalGestureListener;private OnVerticalGestureListener mOnVerticalGestureListener;public InterceptTouchListener(Context mContext) {mCoordinate = new float[2];mMinimumSlop = ViewConfiguration.get(mContext).getScaledTouchSlop();}@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:// Save the coordinate of the point you were click on the screen.setCoordinate(event);break;case MotionEvent.ACTION_MOVE:if (isClickEvent(event)) {// We don't deal with click Event in here.break;} else {if (mOnHorizontalGestureListener != null&& isHorizontalGestureEvent(event)) {return mOnHorizontalGestureListener.onHorizontalGesture(event.getX(), mCoordinate[0]);}if (mOnVerticalGestureListener != null&& isVerticalGestureEvent(event)) {return mOnVerticalGestureListener.onVerticalGesture(event.getY(), mCoordinate[1]);}}break;case MotionEvent.ACTION_UP:break;}return false;}/*** Horizontal Gesture Event is an event, from left to right or a reverse action.** @return return true if the user is moving his finger from left to right or from right to left.*/private boolean isHorizontalGestureEvent(MotionEvent event) {float slopX = getSlopX(event);return slopX > mMinimumSlop && slopX >= getSlopY(event);}/*** Horizontal Gesture Event is an event, from top to down or a reverse action.** @return return true if the user is moving his finger from top to down or from down to top.*/private boolean isVerticalGestureEvent(MotionEvent event) {float slopY = getSlopY(event);return slopY > mMinimumSlop && getSlopX(event) < slopY;}/*** Some phones will perform the ACTION_MOVE action When the user just clicked the screen.* This shouldn't be. Anyway, We gotta deal with it. So that I created this method.** @return return true if the action is just a pressed action.*/private boolean isClickEvent(MotionEvent event) {return getSlopX(event) == 0 && getSlopY(event) == 0;}private void setCoordinate(MotionEvent event) {mCoordinate[0] = event.getX();mCoordinate[1] = event.getY();}/*** Distance in horizontal orientation of the user moving on.*/private float getSlopX(MotionEvent event) {return Math.abs(event.getX() - mCoordinate[0]);}/*** Distance in vertical orientation of the user moving on.*/private float getSlopY(MotionEvent event) {return Math.abs(event.getY() - mCoordinate[1]);}public InterceptTouchListener setOnHorizontalGestureListener(OnHorizontalGestureListener mOnHorizontalGestureListener) {this.mOnHorizontalGestureListener = mOnHorizontalGestureListener;return this;}public InterceptTouchListener setOnVerticalGestureListener(OnVerticalGestureListener mOnVerticalGestureListener) {this.mOnVerticalGestureListener = mOnVerticalGestureListener;return this;}public interface OnHorizontalGestureListener {/*** Called When user is moving his finger in horizontally orientation.** @return return true if you want to intercept the touch Event.*/boolean onHorizontalGesture(float currentX, float lastX);}/*** Called When user is moving his finger in vertically orientation.** @return return true if you want to intercept the touch Event.*/public interface OnVerticalGestureListener {boolean onVerticalGesture(float currentY, float lastY);}}

Thank you for reading my posted. If you have any questions, You can comment below. Thank you.