运行效果
C#实现
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using Android.App;using Android.OS;using Android.Widget;namespace ImageDemo{ [Activity(Label = "@string/ApplicationName", MainLauncher = true, Icon = "@drawable/icon")] public class MainActivity : Activity { private Gallery _gallery; private ImageView _selectedImg; private readonly int[] _imageIds = { Resource.Drawable.test1, Resource.Drawable.test2, Resource.Drawable.test3, Resource.Drawable.test4, Resource.Drawable.test5, Resource.Drawable.test6, Resource.Drawable.test7, Resource.Drawable.test8 }; protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); SetContentView(Resource.Layout.Main); _gallery = FindViewById<Gallery>(Resource.Id.gallery); _selectedImg = FindViewById<ImageView>(Resource.Id.currentImg); _gallery.Adapter = new ImageAdapter(this, _imageIds); _gallery.ItemSelected += Gallery_ItemSelected; } private void Gallery_ItemSelected(object sender, AdapterView.ItemSelectedEventArgs e) { _selectedImg.SetImageResource(_imageIds[e.Position]); } }public class ImageAdapter : BaseAdapter { private readonly Context _context; private readonly int[] _imageIds; public ImageAdapter(Context context,int[]imageIds) { _context = context; _imageIds = imageIds; } public override Object GetItem(int position) { return null; } public override long GetItemId(int position) { return 0; } public override int Count { get { return _imageIds.Length; } } public override View GetView(int position, View convertView, ViewGroup parent) { var image = new ImageView(_context); image.SetImageResource(_imageIds[position]); image.LayoutParameters = new Gallery.LayoutParams(150, 100); image.SetScaleType(ImageView.ScaleType.FitXy); return image; } }} |
Java实现
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package com.example.halower.gallerydemo;import android.content.Context;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageView;import static android.widget.Gallery.LayoutParams;public class MainActivity extends ActionBarActivity { private int[] imageIds = { R.drawable.test1, R.drawable.test2, R.drawable.test3, R.drawable.test4, R.drawable.test5, R.drawable.test6, R.drawable.test7, R.drawable.test8 }; Gallery gallery; ImageView currentView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); gallery=(Gallery) findViewById(R.id.gallery); ImageAdapter adapter=new ImageAdapter(this,imageIds); currentView = (ImageView)findViewById(R.id.currentImg); gallery.setAdapter(adapter); gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){ @Override public void onItemSelected(AdapterView<?> parent, View view, int position,long id) { currentView.setImageResource(imageIds[position]); } @Override public void onNothingSelected(AdapterView<?> parent) { } }); }}class ImageAdapter extends BaseAdapter{ Context _context; int[] imageIds; public ImageAdapter(Context context,int[] imageIds){ _context=context; this.imageIds=imageIds; } @Override public int getCount() { return imageIds.length; } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView=new ImageView(_context); imageView.setImageResource(imageIds[position]); imageView.setScaleType(ImageView.ScaleType.FIT_XY); imageView.setLayoutParams(new LayoutParams(70,100)); return imageView; }} |
layout
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"> <ImageView android:layout_width="320dp" android:layout_height="320dp" android:id="@+id/currentImg" android:layout_centerHorizontal="true" /> <Gallery android:layout_width="match_parent" android:layout_height="wrap_content" android:unselectedAlpha="0.6" android:spacing="2pt" android:layout_below="@+id/currentImg" android:id="@+id/gallery" /></RelativeLayout> |
