Android相册效果（使用C#和Java分别实现）

运行效果

C#实现

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

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

<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>