Android控件开发之Gallery

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<Gallery
android:id="@+id/gallery"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:spacing="2px" />
<!-- android:spacing="2px"用来设置图片之间的间距 -->

</LinearLayout>

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter
{
private Context context;

private int[] MyImageIDs =
{
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,
R.drawable.img13,
R.drawable.img14,
R.drawable.img15,
R.drawable.img16,
R.drawable.img17,
R.drawable.img18,
R.drawable.img19,
R.drawable.img20
};

public ImageAdapter(Context context)
{
this.context = context;
}

// 获取图片个数
public int getCount()
{
return MyImageIDs.length;
//return Integer.MAX_VALUE;
}
// 获取图片在库中的位置
public Object getItem(int position)
{
return position;
}

// 获取图片在库中的ID
public long getItemId(int id)
{
return id;
}

public View getView(int position, View convertView, ViewGroup parent)
{
ImageView imageview = new ImageView(this.context);

// 给ImageView设置资源
imageview.setImageResource(this.MyImageIDs[position]);
// 设置布局 图片120*120
imageview.setLayoutParams(new Gallery.LayoutParams(120, 120));
// 设置显示比例类型
imageview.setScaleType(ImageView.ScaleType.FIT_XY);

//imageview.setScaleType(ImageView.ScaleType.FIT_CENTER);
return imageview;
}
}

//要想实现图片无限循环可拖动修改getCount()  函数改为返回值为return Integer.MAX_VALUE;
//imageview.setImageResource(this.MyImageIDs[position] % MyImageIDs.length.);  即可

Activity源码

package com.sx.Gallery;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Gallery;
import android.widget.Toast;

public class GalleryActivity extends Activity
{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

CreateGallery();
}

private void CreateGallery()
{
//获得Gallery对象
Gallery gellery=(Gallery)this.findViewById(R.id.gallery);

//添加ImageAdapter给Gallery对象 注意哦Gallery类并没有setAdapter这个方法 这个方法是从AbsSpinner类继承的
gellery.setAdapter(new ImageAdapter(this));

//设置Gallery的背景图片
//gellery.setBackgroundResource(R.drawable.bg0);

//设置Gallery的事件监听
gellery.setOnItemClickListener(new GalleryItemListener());

}
class GalleryItemListener implements OnItemClickListener
{
public void onItemClick(AdapterView<?> parent, View view, int position,  long id)
{
Toast.makeText(GalleryActivity.this, "你选择了" + (position + 1) + " 号图片", Toast.LENGTH_SHORT).show();
}

}
}