高仿优酷Android客户端图片左右滑动（自动切换）

来源：互联网发布：企业资质软件下载编辑：程序博客网时间：2024/04/30 14:38

本例是用ViewPager去做的实现，支持自动滑动和手动滑动，不仅优酷网，实际上有很多商城和门户网站都有类似的实现:

具体思路：

1. 工程中需要添加android-support-v4.jar,才能使用ViewPager控件.

2. 图片的自动切换: 可使用Timer或者ScheduledExecutorService,这个有多重方式可以实现.

同时要切换底部的dots（园点）

3.Handler+Message机制更新UI,这个相信大家都很熟练，不再描述

4. 实现的一些细节:注意本例中的优化：图片的自动切换启动了其他的线程，要在Activity在可见到不可见的状态,也就是在onStop()方法中将线程停止，在onStart()方法中开启线程。否则，Timer没有停止，或者反复开启，会引起较大的内存消耗，时间一长就程序就会崩掉。还有，就是在跳转到其他Activity的过程中会出现画面的卡顿

下面看一下效果图和具体代码:

工程结构如下图所示：

main.xml:


然后是具体的布局文件及代码实现:
main.xml:
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:background="#FFFFFF"    android:orientation="vertical" >    <RelativeLayout        android:layout_width="fill_parent"        android:layout_height="40dip"        android:background="@drawable/title_bk" >        <ImageButton            android:id="@+id/btn_back"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:background="@drawable/btn_back_selector"            android:src="@drawable/btn_back" />        <View            android:id="@+id/line0"            android:layout_width="1px"            android:layout_height="fill_parent"            android:layout_toRightOf="@id/btn_back"            android:background="#aa11264f" />        <View            android:layout_width="1px"            android:layout_height="fill_parent"            android:layout_toRightOf="@id/line0"            android:background="#009ad6" />        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerInParent="true"            android:text="优酷客户端"            android:textColor="#FFFFFF"            android:textSize="20sp" />    </RelativeLayout>    <FrameLayout        android:layout_width="fill_parent"        android:layout_height="140dip" >        <android.support.v4.view.ViewPager            android:id="@+id/vp"            android:layout_width="fill_parent"            android:layout_height="fill_parent" />        <LinearLayout            android:layout_width="fill_parent"            android:layout_height="35dip"            android:layout_gravity="bottom"            android:background="#33000000"            android:gravity="center"            android:orientation="vertical" >            <TextView                android:id="@+id/tv_title"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="中国家庭院校园区域名字体现"                android:textColor="#ffffff" />            <LinearLayout                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_marginTop="3dip"                android:gravity="center" >                <View                    android:id="@+id/v_dot0"                    style="@style/dot_style"                    android:background="@drawable/dot_focused" />                <View                    android:id="@+id/v_dot1"                    style="@style/dot_style" />                <View                    android:id="@+id/v_dot2"                    style="@style/dot_style" />                <View                    android:id="@+id/v_dot3"                    style="@style/dot_style" />                <View                    android:id="@+id/v_dot4"                    style="@style/dot_style" />            </LinearLayout>        </LinearLayout>    </FrameLayout></LinearLayout>

MyViewPagerActivity:

package com.tony.viewpager;import java.util.ArrayList;import java.util.List;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Parcelable;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.view.View;import android.widget.ImageView;import android.widget.ImageView.ScaleType;import android.widget.TextView;/** * 仿优酷Android客户端图片左右滑动 *  */public class MyViewPagerActivity extends Activity {private ViewPager viewPager; // android-support-v4中的滑动组件private List<ImageView> imageViews; // 滑动的图片集合private String[] titles; // 图片标题private int[] imageResId; // 图片IDprivate List<View> dots; // 图片标题正文的那些点private TextView tv_title;private int currentItem = 0; // 当前图片的索引号// An ExecutorService that can schedule commands to run after a given delay,// or to execute periodically.private ScheduledExecutorService scheduledExecutorService;// 切换当前显示的图片private Handler handler = new Handler() {public void handleMessage(android.os.Message msg) {viewPager.setCurrentItem(currentItem);// 切换当前显示的图片};};@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);imageResId = new int[] { R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.e };titles = new String[imageResId.length];titles[0] = "巩俐不低俗，我就不能低俗";titles[1] = "扑树又回来啦！再唱经典老歌引万人大合唱";titles[2] = "揭秘北京电影如何升级";titles[3] = "乐视网TV版大派送";titles[4] = "热血屌丝的反杀";imageViews = new ArrayList<ImageView>();// 初始化图片资源for (int i = 0; i < imageResId.length; i++) {ImageView imageView = new ImageView(this);imageView.setImageResource(imageResId[i]);imageView.setScaleType(ScaleType.CENTER_CROP);imageViews.add(imageView);}dots = new ArrayList<View>();dots.add(findViewById(R.id.v_dot0));dots.add(findViewById(R.id.v_dot1));dots.add(findViewById(R.id.v_dot2));dots.add(findViewById(R.id.v_dot3));dots.add(findViewById(R.id.v_dot4));tv_title = (TextView) findViewById(R.id.tv_title);tv_title.setText(titles[0]);//viewPager = (ViewPager) findViewById(R.id.vp);viewPager.setAdapter(new MyAdapter());// 设置填充ViewPager页面的适配器// 设置一个监听器，当ViewPager中的页面改变时调用viewPager.setOnPageChangeListener(new MyPageChangeListener());}@Overrideprotected void onStart() {scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();// 当Activity显示出来后，每两秒钟切换一次图片显示scheduledExecutorService.scheduleAtFixedRate(new ScrollTask(), 1, 2, TimeUnit.SECONDS);super.onStart();}@Overrideprotected void onStop() {// 当Activity不可见的时候停止切换scheduledExecutorService.shutdown();super.onStop();}/** * 换行切换任务 *  * @author Administrator *  */private class ScrollTask implements Runnable {public void run() {synchronized (viewPager) {System.out.println("currentItem: " + currentItem);currentItem = (currentItem + 1) % imageViews.size();handler.obtainMessage().sendToTarget(); // 通过Handler切换图片}}}/** * 当ViewPager中页面的状态发生改变时调用 *  * @author Administrator *  */private class MyPageChangeListener implements OnPageChangeListener {private int oldPosition = 0;/** * This method will be invoked when a new page becomes selected. * position: Position index of the new selected page. */public void onPageSelected(int position) {currentItem = position;tv_title.setText(titles[position]);dots.get(oldPosition).setBackgroundResource(R.drawable.dot_normal);dots.get(position).setBackgroundResource(R.drawable.dot_focused);oldPosition = position;}public void onPageScrollStateChanged(int arg0) {}public void onPageScrolled(int arg0, float arg1, int arg2) {}}/** * 填充ViewPager页面的适配器 *  * @author Administrator *  */private class MyAdapter extends PagerAdapter {@Overridepublic int getCount() {return imageResId.length;}@Overridepublic Object instantiateItem(View arg0, int arg1) {((ViewPager) arg0).addView(imageViews.get(arg1));return imageViews.get(arg1);}@Overridepublic void destroyItem(View arg0, int arg1, Object arg2) {((ViewPager) arg0).removeView((View) arg2);}@Overridepublic boolean isViewFromObject(View arg0, Object arg1) {return arg0 == arg1;}@Overridepublic void restoreState(Parcelable arg0, ClassLoader arg1) {}@Overridepublic Parcelable saveState() {return null;}@Overridepublic void startUpdate(View arg0) {}@Overridepublic void finishUpdate(View arg0) {}}}

Drawable目录下
btn_back_selector.xml:

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:drawable="@drawable/btn_top_pressed" android:state_focused="true"></item>    <item android:drawable="@drawable/btn_top_pressed" android:state_pressed="true"></item>    <item android:drawable="@drawable/btn_top_pressed" android:state_selected="true"></item>    <item android:drawable="@drawable/title_bk"></item></selector>

btn_top_pressed.xml:

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="rectangle" >    <gradient        android:angle="270"        android:endColor="#009ad6"        android:startColor="#11264f" /></shape>

dot_focused.xml:

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="oval" >    <solid android:color="#aaFFFFFF" />    <corners android:radius="5dip" /></shape>

dot_normal.xml:

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="oval" >    <solid android:color="#33000000" />    <corners android:radius="5dip" /></shape>

title_bk.xml:

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="rectangle" >    <gradient        android:angle="270"        android:endColor="#11264f"        android:startColor="#009ad6" /></shape>

源码下载地址:

http://download.csdn.net/detail/t12x3456/4751688