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res\drawable-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
IT经典笑语录:有一个小伙子在一个办公大楼的门口抽着烟,一个妇女路过他身边,并对他说,“你知道不知道这个东西会危害你的健康?我是说,你有没有注意到香烟盒上的那个警告(Warning)?” 小伙子说,“没事儿,我是一个程序员”。 那妇女说,“这又怎样?” 程序员说,“我们从来不关心Warning,只关心Error”
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://www.codes51.com/article/detail_113019.html
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