Android UI控件详解-Gallery(画廊)

package com.example.gallery;

import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Gallery;

/**
*
* @author TXF
*
* 用Gallery(画廊)实现图片的无限循环
*
*/
@SuppressLint("ShowToast")
public class MainActivity extends Activity {
@SuppressWarnings("deprecation")
private Gallery mga;
private Context mcontext;
private Integer[] mImageIds = { R.drawable.a, R.drawable.b, R.drawable.c,
R.drawable.d, R.drawable.e };

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 通过findViewById找到gallery对象
mga = (Gallery) findViewById(R.id.gallery);
// 设置整个界面的背景
// mga.setBackgroundResource(R.drawable.ic_launcher);
// 设置适配器
mga.setAdapter(new MyAdapter(this));
// 设置gallery条目被点击的事件监听
mga.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> adapterView, View view,
int position, long id) {
Toast.makeText(MainActivity.this,
"你选择了：" + (position + 1) + "号图片", 0).show();

}
});

}

// 写一个类继承基本适配器(自定义适配器)
private class MyAdapter extends BaseAdapter {
public MyAdapter(Context c) {
mcontext = c;
}

@Override
public int getCount() {
// 整型的最大值为2的31次方减去1
return Integer.MAX_VALUE;
}

@Override
public Object getItem(int position) {
return mImageIds[position];
}

@Override
public long getItemId(int position) {
return position;
}

@SuppressWarnings("deprecation")
@Override
public View getView(int position, View view, ViewGroup parent) {
ImageView iv = new ImageView(mcontext);
// 给imageview设置图片资源
// 为了保证数组角标不能越界mImageIds里面的参数为position%mImageIds.length.
iv.setImageResource(mImageIds[position % mImageIds.length]);
// 设置布局图片以120*120显示(即图片显示尺寸)
iv.setLayoutParams(new Gallery.LayoutParams(200, 200));
// 设置显示比例类型
iv.setScaleType(ImageView.ScaleType.CENTER);
// 返回图片
return iv;
}

}

}

<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" >

<Gallery
android:id="@+id/gallery"
android:layout_width="match_parent"
android:layout_height="120dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:background="#55FFFF" />

</RelativeLayout>