初学Android,手势翻页效果(四十九)

下面是一个利用手势功能做的一个翻页效果

上图实际是一个ViewFlipper容器，里面放了5张图片，从右向左划动，看下一张图片，从左向右划动，看上一张图片

同时在划动时播放动画(缩放和透明度的改变)，这样看起来更生动一些

动画文件

left_in.xml，图片从右向左滑动时的动画,View进入屏幕时候使用的动画

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

left_out.xml l，图片从右向左滑动时的动画, View退出屏幕时候使用的动画

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

向右划动的动画类似，不写出来了

package WangLi.IO.GestureFlip;import android.app.Activity;import android.os.Bundle;import android.view.GestureDetector;import android.view.GestureDetector.OnGestureListener;import android.view.MotionEvent;import android.view.View;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.widget.ImageView;import android.widget.ViewFlipper;public class GestureFlip extends Activity       implements OnGestureListener{//ViewFlipper实例ViewFlipper flipper;//定义手势检测器实例GestureDetector detector;//定义一个动画数组,用于为ViewFlipper指定切换动画效果Animation[] animations = new Animation[4];//定义手势动作两点之间的最小距离final int FLIP_DISTANCE = 50;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        //创建手势检测器        detector = new GestureDetector(this);        //获得ViewFlipper实例        flipper = (ViewFlipper)this.findViewById(R.id.flipper);        //为ViewFlipper添加5个ImageView组件        flipper.addView(addImageView(R.drawable.one));        flipper.addView(addImageView(R.drawable.two));        flipper.addView(addImageView(R.drawable.three));        flipper.addView(addImageView(R.drawable.four));        flipper.addView(addImageView(R.drawable.five));        //初始化Animation数组        animations[0] = AnimationUtils.loadAnimation(this, R.anim.left_in);        animations[1] = AnimationUtils.loadAnimation(this, R.anim.left_out);        animations[2] = AnimationUtils.loadAnimation(this, R.anim.right_in);        animations[3] = AnimationUtils.loadAnimation(this, R.anim.right_out);    }private View addImageView(int resId) {// TODO Auto-generated method stubImageView imageView = new ImageView(this);imageView.setImageResource(resId);imageView.setScaleType(ImageView.ScaleType.CENTER);return imageView;}@Overridepublic boolean onDown(MotionEvent arg0) {// TODO Auto-generated method stubreturn false;}@Overridepublic boolean onFling(MotionEvent event1, MotionEvent event2, float velocityX,float velocityY) {// TODO Auto-generated method stub//如果第一触点事件的x坐标大于第二个触点事件的x坐标超过FLIP_DISTANCE//也就是手势从右向左滑动if(event1.getX() - event2.getX() > FLIP_DISTANCE){//为flipper设置切换的动画效果flipper.setInAnimation(animations[0]);flipper.setOutAnimation(animations[1]);flipper.showPrevious();return true;}if(event2.getX() - event1.getX() > FLIP_DISTANCE){//为flipper设置切换的动画效果flipper.setInAnimation(animations[2]);flipper.setOutAnimation(animations[3]);flipper.showNext();return true;}return false;}@Overridepublic boolean onTouchEvent(MotionEvent event){//将该Activity上的触碰事件交给GestureDetector处理return detector.onTouchEvent(event);}@Overridepublic void onLongPress(MotionEvent arg0) {// TODO Auto-generated method stub}@Overridepublic boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2,float arg3) {// TODO Auto-generated method stubreturn false;}@Overridepublic void onShowPress(MotionEvent arg0) {// TODO Auto-generated method stub}@Overridepublic boolean onSingleTapUp(MotionEvent arg0) {// TODO Auto-generated method stubreturn false;}}

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