Android开发实现高仿优酷的客户端图片左右滑动切换功能实例【附源码下载】

2019-10-22 18:22:58

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本文实例讲述了Android开发实现高仿优酷的客户端图片左右滑动切换功能。分享给大家供大家参考，具体如下：

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:

Android,高仿,优酷,客户端,图片,左右滑动,切换

工程结构如下图所示：

main.xml:

Android,高仿,优酷,客户端,图片,左右滑动,切换

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ID  private 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    };  };  @Override  public 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());  }  @Override  protected 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();  }  @Override  protected 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 {    @Override    public int getCount() {      return imageResId.length;    }    @Override    public Object instantiateItem(View arg0, int arg1) {      ((ViewPager) arg0).addView(imageViews.get(arg1));      return imageViews.get(arg1);    }    @Override    public void destroyItem(View arg0, int arg1, Object arg2) {      ((ViewPager) arg0).removeView((View) arg2);    }    @Override    public boolean isViewFromObject(View arg0, Object arg1) {      return arg0 == arg1;    }    @Override    public void restoreState(Parcelable arg0, ClassLoader arg1) {    }    @Override    public Parcelable saveState() {      return null;    }    @Override    public void startUpdate(View arg0) {    }    @Override    public 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>

完整源码点击此处本站下载。

希望本文所述对大家Android程序设计有所帮助。

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