android手势识别ViewFlipper触摸动画

来源：互联网发布：淘宝美工招聘信息深圳编辑：程序博客网时间：2024/04/28 05:54

今天给大家介绍一下如何实现androd主页面的左右拖动效果。实现起来很简单，就是使用ViewFlipper来将您要来回拖动的View装在一起，然后与GestureDetector手势识别类来联动，确定要显示哪个View，加上一点点动画效果即可。比如当手指向左快速滑动时跳转到上一个 View，手指向右快速滑动时跳转到下一个View，本例中使用图片作为各个View的页面，实现左右快速滑动显示不同的图片。
转自 http://www.ideasandroid.com/archives/414

标签：Android手势

[1].[代码] layout 跳至[1][2][3]

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<linearlayoutandroid:layout_height="fill_parent"android:layout_width="fill_parent"android:orientation="vertical"xmlns:android="http://schemas.android.com/apk/res/android">
    <viewflipperandroid:id="@+id/flipper"android:layout_below="@+id/CockpitLayout"android:layout_height="fill_parent"android:layout_width="fill_parent">
        <includeandroid:id="@+id/firstlayout"layout="@layout/first">
        <includeandroid:id="@+id/secondlayout"layout="@layout/second">
        <includeandroid:id="@+id/thirdlayout"layout="@layout/third">
        <includeandroid:id="@+id/fourthlayout"layout="@layout/fourth">
    </include></include></include></include></viewflipper>
</linearlayout>

[2].[代码] ViewFlipper 跳至[1][2][3]

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<linearlayoutandroid:gravity="center_vertical"android:layout_height="fill_parent"android:layout_width="fill_parent"xmlns:android="http://schemas.android.com/apk/res/android">
  <imageviewandroid:layout_height="wrap_content"android:layout_width="wrap_content"android:src="@drawable/v1">
</imageview></linearlayout>

[3].[代码] 我们的Activity需要实现两个接口OnGestureListener,OnTouchListener。跳至 [1] [2] [3]

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package com.ideasandroid.demo; 
importandroid.app.Activity; importandroid.os.Bundle; importandroid.view.GestureDetector; importandroid.view.MotionEvent; importandroid.view.View; importandroid.view.GestureDetector.OnGestureListener; importandroid.view.View.OnTouchListener; importandroid.view.animation.AccelerateInterpolator; importandroid.view.animation.Animation; importandroid.view.animation.TranslateAnimation; importandroid.widget.ViewFlipper; publicclass ViewFlipperDemo extends Activity implements OnGestureListener,OnTouchListener{
    privateViewFlipper mFlipper; 
    GestureDetector mGestureDetector;
    privateint mCurrentLayoutState;
    privatestatic final int FLING_MIN_DISTANCE = 100;
    privatestatic final int FLING_MIN_VELOCITY = 200;
    @Override
    publicvoid onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main); 
        mFlipper = (ViewFlipper) findViewById(R.id.flipper); 
        //注册一个用于手势识别的类         mGestureDetector = new GestureDetector(this);
        //给mFlipper设置一个listener         mFlipper.setOnTouchListener(this);
        mCurrentLayoutState = 0;
        //允许长按住ViewFlipper,这样才能识别拖动等手势         mFlipper.setLongClickable(true);
    }
    /**
     * 此方法在本例中未用到，可以指定跳转到某个页面
     * @param switchTo
     */
    publicvoid switchLayoutStateTo(intswitchTo) { 
        while (mCurrentLayoutState != switchTo) {
            if (mCurrentLayoutState > switchTo) {
               mCurrentLayoutState--; 
               mFlipper.setInAnimation(inFromLeftAnimation()); 
               mFlipper.setOutAnimation(outToRightAnimation()); 
               mFlipper.showPrevious(); 
            } else { 
               mCurrentLayoutState++; 
               mFlipper.setInAnimation(inFromRightAnimation()); 
               mFlipper.setOutAnimation(outToLeftAnimation()); 
               mFlipper.showNext(); 
            } 
        } 
        ; 
    }
    /**
     * 定义从右侧进入的动画效果
     * @return
     */
    protectedAnimation inFromRightAnimation() { 
        Animation inFromRight = newTranslateAnimation( 
               Animation.RELATIVE_TO_PARENT, +1.0f,
               Animation.RELATIVE_TO_PARENT, 0.0f,
               Animation.RELATIVE_TO_PARENT, 0.0f,
               Animation.RELATIVE_TO_PARENT, 0.0f);
        inFromRight.setDuration(500);
        inFromRight.setInterpolator(newAccelerateInterpolator()); 
        return inFromRight; 
    }
    /**
     * 定义从左侧退出的动画效果
     * @return
     */
    protectedAnimation outToLeftAnimation() { 
        Animation outtoLeft = newTranslateAnimation( 
               Animation.RELATIVE_TO_PARENT, 0.0f,
               Animation.RELATIVE_TO_PARENT, -1.0f,
               Animation.RELATIVE_TO_PARENT, 0.0f,
               Animation.RELATIVE_TO_PARENT, 0.0f);
        outtoLeft.setDuration(500);
        outtoLeft.setInterpolator(newAccelerateInterpolator()); 
        return outtoLeft; 
    }
    /**
     * 定义从左侧进入的动画效果
     * @return
     */
    protectedAnimation inFromLeftAnimation() { 
        Animation inFromLeft = newTranslateAnimation( 
               Animation.RELATIVE_TO_PARENT, -1.0f,
               Animation.RELATIVE_TO_PARENT, 0.0f,
               Animation.RELATIVE_TO_PARENT, 0.0f,
               Animation.RELATIVE_TO_PARENT, 0.0f);
        inFromLeft.setDuration(500);
        inFromLeft.setInterpolator(newAccelerateInterpolator()); 
        return inFromLeft; 
    }
    /**
     * 定义从右侧退出时的动画效果
     * @return
     */
    protectedAnimation outToRightAnimation() { 
        Animation outtoRight = newTranslateAnimation( 
               Animation.RELATIVE_TO_PARENT, 0.0f,
               Animation.RELATIVE_TO_PARENT, +1.0f,
               Animation.RELATIVE_TO_PARENT, 0.0f,
               Animation.RELATIVE_TO_PARENT, 0.0f);
        outtoRight.setDuration(500);
        outtoRight.setInterpolator(newAccelerateInterpolator()); 
        return outtoRight; 
    }
    publicboolean onDown(MotionEvent e) {
        // TODO Auto-generated method stub         return false; 
    }
    /*
     * 用户按下触摸屏、快速移动后松开即触发这个事件
     * e1：第1个ACTION_DOWN MotionEvent
     * e2：最后一个ACTION_MOVE MotionEvent
     * velocityX：X轴上的移动速度，像素/秒
     * velocityY：Y轴上的移动速度，像素/秒
     * 触发条件 ：
     * X轴的坐标位移大于FLING_MIN_DISTANCE，且移动速度大于FLING_MIN_VELOCITY个像素/秒
     */
    publicboolean onFling(MotionEvent e1, MotionEvent e2,float velocityX,
            float velocityY) { 
        if (e1.getX() - e2.getX() > FLING_MIN_DISTANCE
               && Math.abs(velocityX) > FLING_MIN_VELOCITY) { 
            // 当像左侧滑动的时候             //设置View进入屏幕时候使用的动画             mFlipper.setInAnimation(inFromRightAnimation());
            //设置View退出屏幕时候使用的动画             mFlipper.setOutAnimation(outToLeftAnimation()); 
            mFlipper.showNext(); 
        } else if (e2.getX() - e1.getX() > FLING_MIN_DISTANCE 
               && Math.abs(velocityX) > FLING_MIN_VELOCITY) { 
            // 当像右侧滑动的时候             mFlipper.setInAnimation(inFromLeftAnimation()); 
            mFlipper.setOutAnimation(outToRightAnimation()); 
            mFlipper.showPrevious(); 
        } 
        return false;
    }
    publicvoid onLongPress(MotionEvent e) {
        // TODO Auto-generated method stub 
    }
    publicboolean onScroll(MotionEvent e1, MotionEvent e2,float distanceX,
            float distanceY) { 
        return false;
    }
    publicvoid onShowPress(MotionEvent e) {
        // TODO Auto-generated method stub 
    }
    publicboolean onSingleTapUp(MotionEvent e) {
        // TODO Auto-generated method stub         return false; 
    }
    publicboolean onTouch(View v, MotionEvent event) {
        // 一定要将触屏事件交给手势识别类去处理（自己处理会很麻烦的）         return mGestureDetector.onTouchEvent(event); 
    }
}

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