有关ViewFlipper的使用及设置动画效果的讲解

说到左右滑动，其实实现左右滑动的方式很多，有ViewPaer，自定义实现Viewgroup，gallery等都可以达到这种效果。这里做下ViewFliper实现左右滑动的效果。
会用到以下的技术：
1、ViewFlipper
2、GestureDetector
3、Animation
主要是这三个类在起作用。
ViewFlipper，不妨把它看做一个容器吧，你可以把许多的View放在这个容器中，让它展示给用户，虽然它每次只展示一个view，我感觉它的用途更好是作为广告展示，比如类似购物网站那样的广告滚动展示。比如可以设置自动播放功能，就可以滚动广告了！

原理：向左向右滑动主要是依赖手势来控制，手势向右滑动就调用 viewFlipper.showNext()方法，同理，向左滑动就会去调用viewFlipper.showPrevious()方法。

效果图如下：

接下来直接上代码：

首先在布局文件中添加ViewFlipper的标签：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:background="@drawable/pattern1" >    <Button        android:id="@+id/treasure_chest_btn"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:background="@drawable/treasure" />    <ViewFlipper        android:id="@+id/viewflipper"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_below="@id/treasure_chest_btn" >    </ViewFlipper>    <Button        android:id="@+id/garbage_btn"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_below="@id/viewflipper"        android:background="@drawable/garbage" /></RelativeLayout>

其次是在anim中定义动画：
slide_left_in.xml：

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" >    <!--     画面转换位置移动动画效果      开始向左动画     fromXDelta ： 动画开始时 X坐标位置     toXDelta ：动画结束时 X坐标位置     duration ：动画持续时间    -->    <translate        android:duration="800"        android:fromXDelta="100%p"        android:toXDelta="0" /></set>

slide_left_out.xml：

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" >    <translate        android:duration="800"        android:fromXDelta="0"        android:toXDelta="-100%p" /></set>

slide_right_in.xml：

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" >    <translate        android:duration="800"        android:fromXDelta="-100%p"        android:toXDelta="0" /></set>

slide_right_out.xml：

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" >    <translate        android:duration="800"        android:fromXDelta="0"        android:toXDelta="100%p" /></set>

最后是Activity中的实现：

package net.loonggg.demo.slider;import android.app.Activity;import android.os.Bundle;import android.view.GestureDetector;import android.view.GestureDetector.OnGestureListener;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.view.Window;import android.view.animation.Animation;import android.view.animation.Animation.AnimationListener;import android.view.animation.AnimationSet;import android.view.animation.AnimationUtils;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;import android.widget.ViewFlipper;public class MainActivity extends Activity implements OnGestureListener,OnTouchListener {private GestureDetector detector;private ViewFlipper myViewFlipper;private int[] imgs = { R.drawable.img0, R.drawable.img1, R.drawable.img2,R.drawable.img3, R.drawable.img4, R.drawable.img5 };private int displayedChildIndex = 0;private Button treasure_btn;private Button garbage_btn;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.main);myViewFlipper = (ViewFlipper) findViewById(R.id.viewflipper);treasure_btn = (Button) findViewById(R.id.treasure_chest_btn);garbage_btn = (Button) findViewById(R.id.garbage_btn);myViewFlipper.setOnTouchListener(this);myViewFlipper.setLongClickable(true);// 设置长按事件// myViewFlipper.setAutoStart(true);// 设置是否自动播放，默认不自动播放detector = new GestureDetector(this);addFlipperView();}/** * 向FlipperView中动态添加View */private void addFlipperView() {for (int i = 0; i < imgs.length; i++) {View view = LayoutInflater.from(this).inflate(R.layout.myviewflipper, null);TextView title = (TextView) view.findViewById(R.id.view_title);title.setText("头像");ImageView iv = (ImageView) view.findViewById(R.id.view_image);iv.setBackgroundResource(imgs[i]);myViewFlipper.addView(view);}}@Overridepublic boolean onDown(MotionEvent e) {return false;}@Overridepublic void onShowPress(MotionEvent e) {}@Overridepublic boolean onSingleTapUp(MotionEvent e) {return false;}@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,float distanceY) {return false;}@Overridepublic void onLongPress(MotionEvent e) {}@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {// 返回当前正在显示的子视图的索引displayedChildIndex = myViewFlipper.getDisplayedChild();final ImageView iv = (ImageView) myViewFlipper.getChildAt(displayedChildIndex).findViewById(R.id.view_image);if (e2.getX() - e1.getX() >= 100 && e1.getY() - e2.getY() >= 100) {AnimationSet outAnim = (AnimationSet) AnimationUtils.loadAnimation(this, R.anim.collect_treasure);iv.startAnimation(outAnim);outAnim.setAnimationListener(new AnimationListener() {public void onAnimationStart(Animation animation) {}public void onAnimationRepeat(Animation animation) {}public void onAnimationEnd(Animation animation) {showNextView();AnimationSet downAnim = (AnimationSet) AnimationUtils.loadAnimation(MainActivity.this, R.anim.up_or_down);treasure_btn.setAnimation(downAnim);iv.clearAnimation();}});} else if (e1.getX() - e2.getX() >= 100 && e2.getY() - e1.getY() >= 100) {AnimationSet outAnim = (AnimationSet) AnimationUtils.loadAnimation(this, R.anim.throw_garbage);iv.startAnimation(outAnim);outAnim.setAnimationListener(new AnimationListener() {public void onAnimationStart(Animation animation) {}public void onAnimationRepeat(Animation animation) {}public void onAnimationEnd(Animation animation) {showNextView();AnimationSet leftAnim = (AnimationSet) AnimationUtils.loadAnimation(MainActivity.this,R.anim.left_or_right);garbage_btn.setAnimation(leftAnim);iv.clearAnimation();}});} else if (e1.getX() - e2.getX() >= 100) {showNextView();} else if (e2.getX() - e1.getX() >= 100) {showPreviousView();}return false;}private void showPreviousView() {myViewFlipper.setInAnimation(AnimationUtils.loadAnimation(this,R.anim.slide_right_in));myViewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this,R.anim.slide_right_out));myViewFlipper.showPrevious();}private void showNextView() {myViewFlipper.setInAnimation(AnimationUtils.loadAnimation(this,R.anim.slide_left_in));myViewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this,R.anim.slide_left_out));myViewFlipper.showNext();}@Overridepublic boolean onTouch(View v, MotionEvent event) {return detector.onTouchEvent(event);}}

转载请注明出处：http://blog.csdn.net/loongggdroid/article/details/18262543