本示例演示在Android中实现图片左右滑动效果。
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。为了方便大家理解,我们先来看一下效果图:
主要效果图如下图:
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. */@Overridepublic 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;}@Overridepublic boolean onTouchEvent(MotionEvent event) {// TODO Auto-generated method stubreturn this.detector.onTouchEvent(event);}@Overridepublic boolean onDown(MotionEvent e) {// TODO Auto-generated method stubreturn false;}@Overridepublic 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;}@Overridepublic void onLongPress(MotionEvent e) {// TODO Auto-generated method stub }@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,float distanceY) {// TODO Auto-generated method stubreturn false;}@Overridepublic void onShowPress(MotionEvent e) {// TODO Auto-generated method stub }@Overridepublic boolean onSingleTapUp(MotionEvent e) {// TODO Auto-generated method stubreturn 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:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ViewFlipper android:id="@+id/ViewFlipper1"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
</ViewFlipper>
</LinearLayout>
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:
1. Alpha:渐变透明度动画效果
2. Scale:渐变尺寸伸缩动画效果
3. Translate:画面转换位置移动动画效果
4. Rotate:画面转换位置移动动画效果
push_left_in.xml文件中代码:
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromXDelta="100%p" android:toXDelta="0"
android:duration="500" />
<alpha android:fromAlpha="0.1" android:toAlpha="1.0"
android:duration="500" />
</set>
push_left_out.xml文件中代码:
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromXDelta="0" android:toXDelta="-100%p"
android:duration="500" />
<alpha android:fromAlpha="1.0" android:toAlpha="0.1"
android:duration="500" />
</set>
push_right_in.xml文件中代码:
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromXDelta="-100%p" android:toXDelta="0"
android:duration="500" />
<alpha android:fromAlpha="0.1" android:toAlpha="1.0"
android:duration="500" />
</set>
push_right_out.xml文件中代码:
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromXDelta="0" android:toXDelta="100%p"
android:duration="500" />
<alpha android:fromAlpha="1.0" android:toAlpha="0.1"
android:duration="500" />
</set>
如果大家想实现带指引效果的左右滑动,请访问博文:http://www.cnblogs.com/hanyonglu/archive/2012/04/07/2435589.html
如果想实现带渐显按钮的左右滑动效果,请访问博文:http://www.cnblogs.com/hanyonglu/archive/2012/02/13/2350171.html
下载地址:点击下载
最后,希望转载的朋友能够尊重作者的劳动成果,加上转载地址:http://www.cnblogs.com/hanyonglu/archive/2012/02/13/2349827.html 谢谢。
结束。^_^