Android onTouchEvent事件

根据用户的触摸判断滑动方向，选择弹出popupWindow 或者dialog ,也可以切换界面，定义切换动画

定义接口：

/** * According to the Angle of the sliding range sliding direction * @author LanYan * */public interface OnEventListener {/** * ← */void onLeft();/** * ↑ */void onTop();/** * → */void onRight();/** * ↓ */void onBottom();/** * ↗ */void onNortheast();/** * ↖ */void onNorthwest();/** * ↙ */void onSouthwest();/** * ↘ */void onSoutheast();/** * 触摸屏幕 */void onTouch();/** * 事件分发 */EventType onEventDistribute();

方法调用工具类：

import android.view.MotionEvent;import android.view.View;public class OnEventTouchFactory {private static OnEventTouchFactory mCurrent;private static OnEventListener mListener;private int mLastEventX;private int mLastEventY;private EventType mType;private int mDistance = 50;private double cos;private double result;private EventType mCurrentType = null;public OnEventTouchFactory() {}public static OnEventTouchFactory getInstance(OnEventListener listener) {mListener = listener;if (mCurrent == null) {mCurrent = new OnEventTouchFactory();}return mCurrent;}public boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubboolean  status=false;mListener.onTouch();int eventX = (int) event.getX();int eventY = (int) event.getY();int action = event.getAction();if (action == MotionEvent.ACTION_DOWN) {mLastEventX = eventX;mLastEventY = eventY;mCurrentType = mListener.onEventDistribute();status=true;} else if (action == MotionEvent.ACTION_MOVE) {if (mCurrentType == EventType.normal) {cos = getAngle(eventX, eventY, mLastEventX, mLastEventY);result = getDistance(mLastEventX, mLastEventY, eventX, eventY);/** * EeventType: Left ←: [157.5,202.5] Top ↑: [67.5,112.5] Right * →: [337.5,360]&&[0,22.5] Bottom ↓: [247.5,292.5] Northwest ↖: * [112.5,157.5] ┅┅┅┅┅ ┅┅┅┅┅ ┅┅┅┅┅ Southeast ↘: [292.5,337.5] ┇ * Southwest ↙: [202.5,247.5] ┇ Northeast ↗: [22.5,67.5] ┇ ┇ * VelocityXY ↖↗ --------------- ↙ ↘ ┅┅┅┅┅ ┅┅┅┅┅ ┅┅┅┅┅┅┅┅┅┅ * ┅┅┅┅┅┇ */if ((cos >= 0 && cos <= 22.5) || (cos >= 337.5 && cos <= 360)) {mType = EventType.left;}else if (cos > 22.5 && cos <= 67.5) {mType = EventType.nortwest;}else if (cos >= 67.5 && cos <= 112.5) {mType = EventType.top;}else if (cos > 112.5 && cos < 157.5) {mType = EventType.northeast;}else if (cos >= 157.5 && cos <= 202.5) {mType = EventType.right;}else if (cos > 202.5 && cos < 247.5) {mType = EventType.southeast;}else if (cos >= 247.5 && cos <= 292.5) {mType = EventType.bottom;}else if (cos > 292.5 && cos < 337.5) {mType = EventType.southwest;}status=true;}  else if (mCurrentType == EventType.complete) {status= false;}} else if (action == MotionEvent.ACTION_UP) {if (mType == EventType.right && result > mDistance) {mListener.onRight();} else if (mType == EventType.top && result > mDistance) {mListener.onTop();} else if (mType == EventType.northeast && result > mDistance) {mListener.onNortheast();} else if (mType == EventType.nortwest && result > mDistance) {mListener.onNorthwest();} else if (mType == EventType.left && result > mDistance) {mListener.onLeft();} else if (mType == EventType.southeast && result > mDistance) {mListener.onSoutheast();} else if (mType == EventType.southwest && result > mDistance) {mListener.onSouthwest();} else if (mType == EventType.bottom && result > mDistance) {mListener.onBottom();}status=  true;}return status;}public double getAngle(int px1, int py1, int px2, int py2) {// 两点的x、y值int x = px2 - px1;int y = py2 - py1;double hypotenuse = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));// 斜边长度double cos = x / hypotenuse;double radian = Math.acos(cos);// 求出弧度double angle = 180 / (Math.PI / radian);// 用弧度算出角度if (y < 0) {angle = 180 + (180 - angle);} else if ((y == 0) && (x < 0)) {angle = 180;}return angle;}/** * 获取两点的距离 *  * @param x1 * @param y1 * @param x2 * @param y2 * @return */public double getDistance(int x1, int y1, int x2, int y2) {double d = (x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1);return Math.sqrt(d);}public enum EventType {left, top, right, bottom, nortwest, southeast, southwest, northeast,/** * event不向下分发 */normal,/** * 完全向下分发 */complete}}

BaseActivity类：

import com.example.base.OnEventTouchFactory.EventType;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.widget.Toast;public abstract class BaseActivity extends Activity implements OnTouchListener, OnEventListener{protected Class<?> mLeftClass=null;protected Class<?> mRightClass=null;protected Class<?> mTopClass=null;protected Class<?> mBottomClass=null;protected Class<?> mNortheastClass=null;protected Class<?> mNorthwestClass=null;protected Class<?> mSoutheastClass=null;protected Class<?> mSouthwestClass=null;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setTheme();setContentView(getLayoutResID());configClass();initialization();}public abstract int getLayoutResID();public void setTheme(){}public void configClass(){}public void initialization(){}/***********************************onTouch*********************************************/@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubif(OnEventTouchFactory.getInstance(this).onTouch(v, event)){return true;}return false;}@Overridepublic void onLeft() {// TODO Auto-generated method stub}@Overridepublic void onTop() {// TODO Auto-generated method stub}@Overridepublic void onRight() {// TODO Auto-generated method stub}@Overridepublic void onBottom() {// TODO Auto-generated method stub}@Overridepublic void onNortheast() {// TODO Auto-generated method stub}@Overridepublic void onNorthwest() {// TODO Auto-generated method stub}@Overridepublic void onSouthwest() {// TODO Auto-generated method stub}@Overridepublic void onSoutheast() {// TODO Auto-generated method stub}@Overridepublic void onTouch() {// TODO Auto-generated method stub}@Overridepublic EventType onEventDistribute() {// TODO Auto-generated method stubreturn EventType.normal;}/***********************************Method*********************************************/public void startActivity(Class<?> cls){Intent intent=new Intent();intent.setClass(this, cls);startActivity(intent);}public void startActivity(Class<?> cls,boolean isFinish){Intent intent=new Intent();intent.setClass(this, cls);startActivity(intent);if(isFinish){finish();}}public void startActivityWithAnimation(Class<?> cls,int enterAnim,int exitAnim){Intent intent=new Intent();intent.setClass(this, cls);startActivity(intent);overridePendingTransition(enterAnim, exitAnim);}public void startActivity(Class<?> cls,boolean isFinish,int enterAnim,int exitAnim){Intent intent=new Intent();intent.setClass(this, cls);startActivity(intent);if(isFinish){finish();}overridePendingTransition(enterAnim, exitAnim);}public void ShowSToast(String message){Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();}public void ShowLToast(String message){Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();}}

测试Activity类：

import android.text.method.ScrollingMovementMethod;import android.widget.RelativeLayout;import android.widget.TextView;import com.example.base.BaseActivity;import com.example.base.OnEventTouchFactory.EventType;public class MainActivity extends BaseActivity {@Overridepublic int getLayoutResID() {// TODO Auto-generated method stubreturn R.layout.activity_main;}@Overridepublic void configClass() {// TODO Auto-generated method stubsuper.configClass();}@Overridepublic void initialization() {// TODO Auto-generated method stubsuper.initialization();RelativeLayout parent=(RelativeLayout)findViewById(R.id.parent);TextView child=(TextView)findViewById(R.id.child);child.setMovementMethod(ScrollingMovementMethod.getInstance());    parent.setOnTouchListener(this);}@Overridepublic void onRight() {// TODO Auto-generated method stubsuper.onRight();ShowSToast("right");}@Overridepublic void onTop() {// TODO Auto-generated method stubsuper.onTop();ShowSToast("top");}@Overridepublic void onLeft() {// TODO Auto-generated method stubsuper.onLeft();ShowSToast("left");}@Overridepublic void onBottom() {// TODO Auto-generated method stubsuper.onBottom();ShowSToast("bottom");}@Overridepublic void onNortheast() {// TODO Auto-generated method stubsuper.onNortheast();ShowSToast("northeast");}@Overridepublic void onNorthwest() {// TODO Auto-generated method stubsuper.onNorthwest();ShowSToast("northwest");}@Overridepublic void onSoutheast() {// TODO Auto-generated method stubsuper.onSoutheast();ShowSToast("southeast");}@Overridepublic void onSouthwest() {// TODO Auto-generated method stubsuper.onSouthwest();ShowSToast("southwest");}@Overridepublic void onTouch() {// TODO Auto-generated method stubsuper.onTouch();}@Overridepublic EventType onEventDistribute() {// TODO Auto-generated method stubreturn super.onEventDistribute();}}

BaseActivity 类实现了OnEventListener,并将该类抽象，那么在子类里面需要手势操作 绑定Touch事件即可，通过OnEventListener的回调函数处理手势操作

这是简单的手势操作，复杂点的（比如onTouch的冲突）需要涉及到 类：View ViewGroup Activity  ，涉及到的方法：dispatchTouchEvent(事件分发)  onInterceptTouchEvent(事件拦截) onTouch onTouchEvent..Activity 里面不含onInterceptTouchEvent方法