Gallery事例

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页面布局content_main.xml

<? xml version= "1.0" encoding= "utf-8" ?><LinearLayout xmlns: android ="http://schemas.android.com/apk/res/android"    android :orientation= "vertical"    android :layout_width= "match_parent"    android :layout_height= "match_parent"    >    <!--定义一个ImageView组件-->    <ImageView        android :id= "@+id/imageView"        android :layout_width= "320dp"        android :layout_height= "320dp"        />    <!--定义一个Gallery组件-->    <!-- android:unselectedAlpha="0.6" 为没有选中的图片的透明度 -->    <Gallery        android :id= "@+id/gallery"        android :layout_width= "match_parent"        android :layout_height= "wrap_content"        android :layout_marginTop= "25dp"        android :unselectedAlpha= "0.6"        android :spacing= "2pt"        /></<span style="font-family: Arial, Helvetica, sans-serif;">LinearLayout</span><span style="font-family: Arial, Helvetica, sans-serif;">></span>

用BaseAdapter将图片显示在布局上

package com.eson.gallery ;import android.os.Bundle ;import android.support.v7.app.AppCompatActivity ;import android.view.View ;import android.view.ViewGroup ;import android.widget.AdapterView ;import android.widget.BaseAdapter ;import android.widget.Gallery ;import android.widget.ImageView ;public class GalleryTest extends AppCompatActivity {    int [] imageIds= new int []{            R.drawable. img1, R.drawable. img2, R.drawable. img3, R.drawable. img4,            R.drawable. img5 ,R.drawable. img6 ,R.drawable. img7 ,R.drawable. img8 ,            R.drawable. img9 ,R.drawable. img10 ,R.drawable. img11 ,R.drawable. img12 ,    } ;    private Gallery gallery ;    private ImageView imageView ;    @Override    protected void onCreate (Bundle savedInstanceState) {        super .onCreate(savedInstanceState) ;        setContentView(R.layout. activity_main );        gallery = (Gallery) findViewById(R.id. gallery );        //获取显示图片的ImageView对象        imageView = (ImageView) findViewById(R.id. imageView );        BaseAdapter adapter= new BaseAdapter() {            @Override            public int getCount () {                return imageIds . length;            }            @Override            public Object getItem( int position) {                return position ;            }            @Override            public long getItemId (int position) {                return position ;            }           //该方法返回View代表了每个列表项            @Override            public View getView( int position, View convertView , ViewGroup parent) {               //创建一个ImageView                ImageView imageView = new ImageView(GalleryTest. this) ;                imageView.setImageResource( imageIds[position]) ;                //设置ImageView设置布局参数                imageView.setLayoutParams( new Gallery.LayoutParams( 150 , 200 )) ;                return imageView;            }        };        gallery .setAdapter(adapter) ;        gallery .setOnItemSelectedListener( new AdapterView.OnItemSelectedListener() {            //当Gallery选项发生改变时触发该方法            @Override            public void onItemSelected (AdapterView<?> parent , View view , int position, long id) {                imageView.setImageResource( imageIds [position]);            }            @Override            public void onNothingSelected (AdapterView<?> parent) {            }        });    }}

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