• android viewpager 图片翻页例子


    使用ViewPager这个类可以轻松实现多个页面的滑动功能

    viewpager默认在工具界面上是找不到的,需求添加android-support-v4.jar包;

    如果没有找到,需要打开Android SDK Manager在Extras中进行下载,最后记得引入工程中并build path。

    (不过,我把代码直接COPY到.XML好像就会自动添加了)

    例子说明:item01..item08是要翻页的图片,page_indicator_focused,page_indicator_unfocused是显示在底部的点点图片,要自己添加到resdrawable-hdpi中;

    .XML

    代码下载:http://pan.baidu.com/s/1mgA7MBY

     1 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     2     android:layout_width="fill_parent"
     3     android:layout_height="fill_parent"
     4     android:orientation="vertical" >
     5 
     6     <android.support.v4.view.ViewPager
     7         android:id="@+id/viewPager"
     8         android:layout_width="fill_parent"
     9         android:layout_height="wrap_content" />
    10 
    11     <RelativeLayout
    12         android:layout_width="fill_parent"
    13         android:layout_height="wrap_content"
    14         android:orientation="vertical" >
    15 
    16         <LinearLayout
    17             android:id="@+id/viewGroup"
    18             android:layout_width="fill_parent"
    19             android:layout_height="wrap_content"
    20             android:layout_alignParentBottom="true"
    21             android:layout_marginBottom="30dp"
    22             android:gravity="center_horizontal"
    23             android:orientation="horizontal" >
    24         </LinearLayout>
    25     </RelativeLayout>
    26 
    27 </FrameLayout>

    .JAVA

      1 package com.example.testa;
      2 
      3 import android.support.v4.view.PagerAdapter;
      4 import android.support.v4.view.ViewPager;
      5 import android.support.v4.view.ViewPager.OnPageChangeListener;
      6 import android.app.Activity;
      7 import android.os.Bundle;
      8 import android.view.View;
      9 import android.view.ViewGroup;
     10 import android.view.ViewGroup.LayoutParams;
     11 import android.widget.ImageView;
     12 import android.widget.LinearLayout;
     13 
     14 public class MainActivity extends Activity implements OnPageChangeListener {
     15 
     16     /**
     17      * ViewPager
     18      */
     19     private ViewPager viewPager;
     20 
     21     /**
     22      * 装点点的ImageView数组
     23      */
     24     private ImageView[] tips;
     25 
     26     /**
     27      * 装ImageView数组
     28      */
     29     private ImageView[] mImageViews;
     30 
     31     /**
     32      * 图片资源id
     33      */
     34     private int[] imgIdArray;
     35 
     36     @Override
     37     protected void onCreate(Bundle savedInstanceState) {
     38         super.onCreate(savedInstanceState);
     39         setContentView(R.layout.activity_main);
     40         ViewGroup group = (ViewGroup) findViewById(R.id.viewGroup);
     41         viewPager = (ViewPager) findViewById(R.id.viewPager);
     42 
     43         // 载入图片资源ID
     44         imgIdArray = new int[] { R.drawable.item01, R.drawable.item02,
     45                 R.drawable.item03, R.drawable.item04, R.drawable.item05,
     46                 R.drawable.item06, R.drawable.item07, R.drawable.item08 };
     47 
     48         // 将点点加入到ViewGroup中
     49         tips = new ImageView[imgIdArray.length];
     50         for (int i = 0; i < tips.length; i++) {
     51             ImageView imageView = new ImageView(this);
     52             imageView.setLayoutParams(new LayoutParams(10, 10));
     53             tips[i] = imageView;
     54             if (i == 0) {
     55                 tips[i].setBackgroundResource(R.drawable.page_indicator_focused);
     56             } else {
     57                 tips[i].setBackgroundResource(R.drawable.page_indicator_unfocused);
     58             }
     59 
     60             LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
     61                     new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,
     62                             LayoutParams.WRAP_CONTENT));
     63             layoutParams.leftMargin = 5;
     64             layoutParams.rightMargin = 5;
     65             group.addView(imageView, layoutParams);
     66         }
     67 
     68         // 将图片装载到数组中
     69         mImageViews = new ImageView[imgIdArray.length];
     70         for (int i = 0; i < mImageViews.length; i++) {
     71             ImageView imageView = new ImageView(this);
     72             mImageViews[i] = imageView;
     73             imageView.setBackgroundResource(imgIdArray[i]);
     74         }
     75 
     76         // 设置Adapter
     77         viewPager.setAdapter(new MyAdapter());
     78         // 设置监听,主要是设置点点的背景
     79         viewPager.setOnPageChangeListener(this);
     80         // 设置ViewPager的默认项, 设置为长度的100倍,这样子开始就能往左滑动
     81         viewPager.setCurrentItem((mImageViews.length) * 100);
     82 
     83     }
     84 
     85     /**
     86      * 
     87      * @author xiaanming
     88      * 
     89      */
     90     public class MyAdapter extends PagerAdapter {
     91 
     92         @Override
     93         public int getCount() {
     94             return Integer.MAX_VALUE;
     95         }
     96 
     97         @Override
     98         public boolean isViewFromObject(View arg0, Object arg1) {
     99             return arg0 == arg1;
    100         }
    101 
    102         @Override
    103         public void destroyItem(View container, int position, Object object) {
    104         }
    105 
    106         /**
    107          * 载入图片进去,用当前的position 除以 图片数组长度取余数是关键
    108          */
    109         @Override
    110         public Object instantiateItem(View container, int position) {
    111              try {    
    112                     ((ViewPager)container).addView(mImageViews[position % mImageViews.length], 0);  
    113                 }catch(Exception e){  
    114                     //handler something  
    115                 }  
    116                 return mImageViews[position % mImageViews.length];            
    117     
    118         }
    119 
    120     }
    121 
    122     @Override
    123     public void onPageScrollStateChanged(int arg0) {
    124 
    125     }
    126 
    127     @Override
    128     public void onPageScrolled(int arg0, float arg1, int arg2) {
    129 
    130     }
    131 
    132     @Override
    133     public void onPageSelected(int arg0) {
    134         setImageBackground(arg0 % mImageViews.length);
    135     }
    136 
    137     /**
    138      * 设置选中的tip的背景
    139      * 
    140      * @param selectItems
    141      */
    142     private void setImageBackground(int selectItems) {
    143         for (int i = 0; i < tips.length; i++) {
    144             if (i == selectItems) {
    145                 tips[i].setBackgroundResource(R.drawable.page_indicator_focused);
    146             } else {
    147                 tips[i].setBackgroundResource(R.drawable.page_indicator_unfocused);
    148             }
    149         }
    150     }
    151 
    152 }

    转自:http://blog.csdn.net/xiaanming/article/details/8966621

    打开链接可查看效果图

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  • 原文地址:https://www.cnblogs.com/jenson138/p/4287460.html
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