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>