关于滑动效果,在Android中用得比较多,本示例实现的滑动效果是使用ViewFlipper来实现的,当然也可以使用其它的View来实现。接下来就让我们开始实现这种效果。
接下来我们看一下程序结构图:
MainActivity文件中代码:
package com.android.flip; import android.app.Activity; import android.os.Bundle; import android.view.GestureDetector; import android.view.MotionEvent; import android.view.View; import android.view.GestureDetector.OnGestureListener; import android.view.animation.AnimationUtils; import android.widget.ImageView; import android.widget.ViewFlipper; /** * Android实现左右滑动效果 * @Description: Android实现左右滑动效果 * @File: MainActivity.java * @Package com.android.flip * @Author Hanyonglu * @Date 2012-02-12 上午10:44:04 * @Version V1.0 */ public class MainActivity extends Activity implements OnGestureListener { private ViewFlipper flipper; private GestureDetector detector; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); detector = new GestureDetector(this); flipper = (ViewFlipper) this.findViewById(R.id.ViewFlipper1); 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)); } private View addImageView(int id) { ImageView iv = new ImageView(this); iv.setImageResource(id); return iv; } @Override public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub return this.detector.onTouchEvent(event); } @Override public boolean onDown(MotionEvent e) { // TODO Auto-generated method stub return false; } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { if (e1.getX() - e2.getX() > 120) { this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_in)); this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_out)); this.flipper.showNext(); return true; } else if (e1.getX() - e2.getX() <-120) { this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_in)); this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_out)); this.flipper.showPrevious(); return true; } return false; } @Override public void onLongPress(MotionEvent e) { // TODO Auto-generated method stub } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { // TODO Auto-generated method stub return false; } @Override public void onShowPress(MotionEvent e) { // TODO Auto-generated method stub } @Override public boolean onSingleTapUp(MotionEvent e) { // TODO Auto-generated method stub return false; } }
布局界面相对比较简单,我们只需要加入ViewFlipper就可以,代码如下:
<&#63;xml version="1.0" encoding="utf-8"&#63;>
为了使其滑动时有一定的特效,我们需要加入Animation效果,说到Animation,我们先看下如何在Android中实现自定义Animation。自定义的Animation是以XML格式定义的,定义好的XML文件存放在res/anim中。
一般的Animation有以下四种类型:
push_left_in.xml文件中代码:
<&#63;xml version="1.0" encoding="utf-8"&#63;>push_left_out.xml文件中代码: <&#63;xml version="1.0" encoding="utf-8"&#63;>
push_right_in.xml文件中代码:
<&#63;xml version="1.0" encoding="utf-8"&#63;>
push_right_out.xml文件中代码:
<&#63;xml version="1.0" encoding="utf-8"&#63;>
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。