reDetector延伸SimpleOnGestureListe

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MyGestureDetector延伸SimpleOnGestureListener

本文介绍了MyGestureDetector延伸SimpleOnGestureListener的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我在执行一个MyGestureDetector扩展一个SimpleOnGestureListener。我从借来的类：<一href="http://www.$c$cshogun.com/blog/tag/view-flipper/">http://www.$c$cshogun.com/blog/tag/view-flipper/以允许在一个ViewFlipper轻扫动作。我不能得到，如果要在模拟器上运行。有什么建议？

下面是所有的code：

在main.java 

 进口android.app.Activity;
进口android.os.Bundle;
进口android.view.GestureDetector;
进口android.view.KeyEvent;
进口android.view.MotionEvent;进口android.view.View;
进口android.view.GestureDetector.SimpleOnGestureListener;
进口android.view.animation.Animation;
进口android.view.animation.AnimationUtils;
进口android.webkit.WebView;
进口android.widget.ViewFlipper;


公共类主要的扩展活动{

私有静态最终诠释SWIPE_MIN_DISTANCE = 120;
私有静态最终诠释SWIPE_MAX_OFF_PATH = 250;
私有静态最终诠释SWIPE_THRESHOLD_VELOCITY = 200;
私人GestureDetector gestureDetector;
View.OnTouchListener gestureListener;
民营动画slideLeftIn;
民营动画slideLeftOut;
民营动画slideRightIn;
民营动画slideRightOut;
私人ViewFlipper viewFlipper;

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.main）;

    // ---------------------------------设置滑动动画到下一个视图 - ＆GT;
    viewFlipper =（ViewFlipper）findViewById（R.id.AC4313）;
    slideLeftIn = AnimationUtils.loadAnimation（这一点，R.anim.slide_left_in）;
    slideLeftOut = AnimationUtils.loadAnimation（这一点，R.anim.slide_left_out）;
    slideRightIn = AnimationUtils.loadAnimation（这一点，R.anim.slide_right_in）;
    slideRightOut = AnimationUtils.loadAnimation（这一点，R.anim.slide_right_out）;

    gestureDetector =新GestureDetector（新MyGestureDetector（））;
    gestureListener =新View.OnTouchListener（）{
        公共布尔onTouch（视图V，MotionEvent事件）{
            如果（gestureDetector.onTouchEvent（事件））{
                返回true;
            }
            返回false;
        }
    };
}

类MyGestureDetector扩展SimpleOnGestureListener {
    @覆盖
    公共布尔onFling（MotionEvent E1，E2 MotionEvent，浮velocityX，浮velocityY）{
        尝试 {
            如果（Math.abs（e1.getY（） -  e2.getY（））＆GT; SWIPE_MAX_OFF_PATH）
                返回false;
            //从右向左轻扫
            如果（e1.getX（） -  e2.getX（）＆GT; SWIPE_MIN_DISTANCE＆安培;＆安培; Math.abs（velocityX）＆GT; SWIPE_THRESHOLD_VELOCITY）{
                viewFlipper.setInAnimation（slideLeftIn）;
                viewFlipper.setOutAnimation（slideLeftOut）;
                viewFlipper.showNext（）;
            }否则，如果（e2.getX（） -  e1.getX（）＆GT; SWIPE_MIN_DISTANCE和放大器;＆安培; Math.abs（velocityX）＆GT; SWIPE_THRESHOLD_VELOCITY）{
                viewFlipper.setInAnimation（slideRightIn）;
                viewFlipper.setOutAnimation（slideRightOut）;
                viewFlipper.show previous（）;
            }
        }赶上（例外五）{
            //什么
        }
        返回false;
    }
}

@Override // ------------------------------通过重写onTouch（）方法捕捉手势事件： - ＆GT;
公共布尔的onTouchEvent（MotionEvent事件）{
    如果（gestureDetector.onTouchEvent（事件））
        返回true;
    其他
        返回false;
}

在动画*的.xml的：

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;

＆LT;设置的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android＆GT;
    ＆LT;翻译机器人：fromXDelta =100％p的机器人：toXDelta =0机器人：时间=800/＆GT;
＆LT; /集＆gt;

解决方案

我认为这个问题是你不覆盖 OnDown 事件。添加该code片段到你的 MyGestureDetector 类，它应该是工作。

  @覆盖
公共布尔onDown（MotionEvent E）{
    返回true;
}

在 onDown 事件返回false在默认情况下，每一个手势开始与 onDown 让你的 onFling 事件将不会触发。

·伊什特万

I am implementing a MyGestureDetector that extends a SimpleOnGestureListener. I borrowed the class from: http://www.codeshogun.com/blog/tag/view-flipper/ to allow a swipe action in a ViewFlipper. I can not get if to function on the emulator. Any suggestions?

Below is all of the code:

The main.java

import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.KeyEvent;
import android.view.MotionEvent;import android.view.View;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.webkit.WebView;
import android.widget.ViewFlipper;


public class main extends Activity {

private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private GestureDetector gestureDetector;
View.OnTouchListener gestureListener;
private Animation slideLeftIn;
private Animation slideLeftOut;
private Animation slideRightIn;
private Animation slideRightOut;
private ViewFlipper viewFlipper;

    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // ---------------------------------Sets Swipe Animation to Next View -->
    viewFlipper = (ViewFlipper)findViewById(R.id.AC4313);
    slideLeftIn = AnimationUtils.loadAnimation(this, R.anim.slide_left_in);
    slideLeftOut = AnimationUtils.loadAnimation(this, R.anim.slide_left_out);
    slideRightIn = AnimationUtils.loadAnimation(this, R.anim.slide_right_in);
    slideRightOut = AnimationUtils.loadAnimation(this, R.anim.slide_right_out);

    gestureDetector = new GestureDetector(new MyGestureDetector());
    gestureListener = new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
            if (gestureDetector.onTouchEvent(event)) {
                return true;
            }
            return false;
        }
    };
}

class MyGestureDetector extends SimpleOnGestureListener {
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {
        try {
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                return false;
            // right to left swipe
            if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                viewFlipper.setInAnimation(slideLeftIn);
                viewFlipper.setOutAnimation(slideLeftOut);
                viewFlipper.showNext();
            }  else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                viewFlipper.setInAnimation(slideRightIn);
                viewFlipper.setOutAnimation(slideRightOut);
                viewFlipper.showPrevious();
            }
        } catch (Exception e) {
            // nothing
        }
        return false;
    }
}

@Override // ------------------------------ Catch the Gesture Event by Overriding onTouch() method: -->
public boolean onTouchEvent(MotionEvent event) {
    if (gestureDetector.onTouchEvent(event))
        return true;
    else
        return false;
}

The anim *.xml's:

<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="100%p" android:toXDelta="0" android:duration="800"/>
</set>
解决方案

I think the problem is that you don't override the OnDown event. Add this code snippet to your MyGestureDetector class, and it should be work.

@Override
public boolean onDown(MotionEvent e) {
    return true;
}

The onDown event return false by default, and every gesture start with onDown so your onFling event will not fire.

Istvan

这篇关于MyGestureDetector延伸SimpleOnGestureListener的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

08-29 03:15
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