Android 手势识别判断，GestureDetector封装

package wk.demo.widget;import android.content.Context;import android.util.AttributeSet;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.ScaleGestureDetector;import android.view.View;/** * 功能描述：自定义屏幕上下左右手势滑动 。  
 * 所有的手势 都用view 转交给 探测器 GestureDetector ，ScaleGestureDetector   
 * 它们都有完整的回调，不要自己去通过计算。   
 void scrollToLeft( );//向左   
 void scrollToRight( );//向右   
 void scrollToTop( );//向上   
 void scrollToBottom( );//向下   
 void zoomToMax( float scale);//手势放大   
 void zoomToMin( float scale);//手势缩小   
 void zoomStop( ); //停止缩小   
 void doubleClick( ); 双击   
 void onClick();  单击   
 void onLongPress();  //长按 */public class GestureView extends View {    /**最小滑动距离*/    private final int minVelocity = 5;    /**     * 对外的接口     */    public MyGestureCallBack myGestureCallBack;    /**     * 手势监听     */    private GestureDetector gestureDetector;    /**     * 缩放监听     */    private ScaleGestureDetector scaleGestureDetector = null;    public GestureView(Context context) {        super(context);        initView(context);    }    public GestureView(Context context, AttributeSet attrs) {        super(context, attrs);        initView(context);    }    private void initView(Context context){        gestureDetector = new GestureDetector(context, onGestureListener);        gestureDetector.setOnDoubleTapListener(onDoubleTapListener);        scaleGestureDetector = new ScaleGestureDetector(context, onScaleGestureListener);    }    public void setCallBack(MyGestureCallBack myGestureCallBack) {        this.myGestureCallBack = myGestureCallBack;    }    private ScaleGestureDetector.OnScaleGestureListener onScaleGestureListener = new ScaleGestureDetector.OnScaleGestureListener() {        @Override        public boolean onScale(ScaleGestureDetector detector) {            float scale=detector.getScaleFactor() ;            if(scale>1){                myGestureCallBack.zoomToMax(scale);            }else{                myGestureCallBack.zoomToMin(scale);            }            return false;        }        @Override        public boolean onScaleBegin(ScaleGestureDetector detector) {            // 一定要返回true才会进入onScale()这个函数            return true;        }        @Override        public void onScaleEnd(ScaleGestureDetector detector) {            myGestureCallBack.zoomStop();        }    };    @Override    public boolean performClick() {        return super.performClick();    }    @Override    public boolean onTouchEvent(MotionEvent event) {        // 手势事件交给 Detector接管        gestureDetector.onTouchEvent(event);        scaleGestureDetector.onTouchEvent(event);        performClick();        return true;    }    private GestureDetector.OnDoubleTapListener onDoubleTapListener = new GestureDetector.OnDoubleTapListener() {        @Override        public boolean onSingleTapConfirmed(MotionEvent e) {            myGestureCallBack.onClick();            return false;        }        @Override        public boolean onDoubleTap(MotionEvent e) {            myGestureCallBack.doubleClick();            return false;        }        @Override        public boolean onDoubleTapEvent(MotionEvent e) {            // 一般可不用            return false;        }    };    private GestureDetector.OnGestureListener onGestureListener = new GestureDetector.OnGestureListener(){        @Override        public boolean onDown(MotionEvent e) {            // 一般可不用            return true;        }        @Override        public void onShowPress(MotionEvent e) {            // 一般可不用        }        @Override        public boolean onSingleTapUp(MotionEvent e) {            // 一般不用            return false;        }        @Override        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {            if (distanceX < -minVelocity) {                myGestureCallBack.scrollToRight( );            } else if (distanceX > minVelocity) {                myGestureCallBack.scrollToLeft( );            } else if (distanceY < -minVelocity) {                myGestureCallBack.scrollToBottom( );            } else if (distanceY > minVelocity) {                myGestureCallBack.scrollToTop( );            }            return true;        }        @Override        public void onLongPress(MotionEvent e) {            myGestureCallBack.onLongPress();        }        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {            if (e1.getX()  - e2.getX() > minVelocity && Math.abs(velocityX) > minVelocity) {                myGestureCallBack.scrollToLeft();            } else if ((e2.getX() - e1.getX() > minVelocity && Math.abs(velocityX) > minVelocity)) {                myGestureCallBack.scrollToRight();            } else if (e1.getY()  - e2.getY() > minVelocity && Math.abs(velocityY) > minVelocity) {                myGestureCallBack.scrollToTop();            } else if ((e2.getY() - e1.getY() > minVelocity && Math.abs(velocityY) > minVelocity)) {                myGestureCallBack.scrollToBottom( );            }            return true;        }    };    public interface MyGestureCallBack {        /**         * 向左         */        void scrollToLeft( );        /**         *  向右         */        void scrollToRight( );        /**         *  向上         */        void scrollToTop( );        /**         * 向下         */        void scrollToBottom( );        /**         * 手势放大         */        void zoomToMax( float scale);        /**         * 手势缩小         */        void zoomToMin( float scale);        /**         * 停止缩小         */        void zoomStop( );        /**         * 双击         */        void doubleClick( );        /**         * 单击         */        void onClick();        /**         * 长按         */        void onLongPress();    }}

使用：gestureView = findViewById(R.id.gestureView) ;gestureView.setCallBack(myGestureCallback);

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