Python特殊语法：filter、map、reduce、lambda [转]

package com.Aina.Android;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ViewSwitcher.ViewFactory;

public class Test_ImageSwitcher extends Activity implements OnClickListener,ViewFactory{
/** Called when the activity is first created. */
//所有要显示的图片资源索引
private static final Integer[] imagelist = {
R.drawable.img1,
R.drawable.img2,
R.drawable.img3,
R.drawable.img4,
R.drawable.img5,
R.drawable.img6,
R.drawable.img7,
R.drawable.img8
};
private ImageSwitcher imageswitcher;
private static int index = 0;
//设置各组件ID
private static final int Button_NEXT = 0x123456;
private static final int Button_BACK = 0x123457;
private static final int ImageSwitcher = 0x123458;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//创建一个线性布局
LinearLayout layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.HORIZONTAL);//水平布局
imageswitcher = new ImageSwitcher(this);
LinearLayout.LayoutParams p2 = new LinearLayout.LayoutParams(120,120);
layout.addView(imageswitcher,p2);
imageswitcher.setId(ImageSwitcher);//设置ID
imageswitcher.setFactory(this);//设置此对象的数据源
imageswitcher.setImageResource(imagelist[index]);
setContentView(layout);

//创建下一张按钮
Button next = new Button(this);
next.setId(Button_NEXT);
next.setText("下一张");
next.setOnClickListener(this);
LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(100,100);
layout.addView(next, p);
//创建上一张按钮
Button back = new Button(this);
back.setId(Button_BACK);
back.setText("上一张");
back.setOnClickListener(this);
layout.addView(back, p);
}
@Override
public void onClick(View v) {
if(v.getId()==Button_BACK){
index--;
if(index<0){
index = imagelist.length-1;
}
imageswitcher.setImageResource(imagelist[index]);
}else if(v.getId()==Button_NEXT){
index++;
if(index>=imagelist.length){
index = 0;
}
imageswitcher.setImageResource(imagelist[index]);
}
}
@Override
public View makeView() {
Log.i("TAG", "makeView()");
return new ImageView(this);
}
}