Android基础之ImageSwitcher与Gallery

1、配置布局文件 main.xml

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

<?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="fill_parent">     <ImageSwitcher         android:id="@+id/imageSwitcher"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_centerInParent="true"         />     <Gallery         android:id="@+id/gallery"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:spacing="8dp"         android:layout_alignParentBottom="true"         /> </RelativeLayout>

2、程序主要代码 MainActivity.java

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97

package com.yin.picture_view;   import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageSwitcher; import android.widget.ImageView; import android.widget.ViewSwitcher.ViewFactory;   public class MainActivity extends Activity {       // 显示图片的资源     private static int[] images = { R.drawable.s0, R.drawable.s1,             R.drawable.s2, R.drawable.s3, R.drawable.s4, R.drawable.s5,             R.drawable.s6, R.drawable.s7, R.drawable.s8, R.drawable.s9 };     Gallery gallery;     ImageSwitcher is;       public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         gallery = (Gallery) findViewById(R.id.gallery);         is = (ImageSwitcher) findViewById(R.id.imageSwitcher);           gallery.setAdapter(new ImageAdapter(this));         // 让选定的图片在中心显示         gallery.setSelection(images.length / 2);           // 为Gallery绑定监听器；         gallery.setOnItemSelectedListener(new OnItemSelectedListener() {             public void onItemSelected(AdapterView<?> parent, View view,                     int position, long id) {                 // 当在Gallery中选定一张图片是 ImageSwitcher同步显示同一张                 // position%images.length 为了让图片循环显示                 is.setImageResource(images[position % images.length]);               }               public void onNothingSelected(AdapterView<?> parent) {               }         });           is.setFactory(new ImageFactory(this));       }       private class ImageAdapter extends BaseAdapter {         private Context context;           public ImageAdapter(Context context) {             this.context = context;         }           // 可以return images.lenght(),在这里返回Integer.MAX_VALUE         // 是为了使图片循环显示         public int getCount() {             return Integer.MAX_VALUE;         }           public Object getItem(int position) {             return null;         }           public long getItemId(int position) {             return 0;         }           public View getView(int position, View convertView, ViewGroup parent) {             ImageView iv = new ImageView(context);             iv.setImageResource(images[position % images.length]);             iv.setLayoutParams(new Gallery.LayoutParams(90, 90));             iv.setAdjustViewBounds(true);             return iv;         }     }       private class ImageFactory implements ViewFactory {         private Context context;           public ImageFactory(Context context) {             this.context = context;         }           public View makeView() {             ImageView iv = new ImageView(context);             iv.setLayoutParams(new ImageSwitcher.LayoutParams(200, 200));             return iv;         }     } }