Android开发之--读取文件夹下图片生成略缩图并点击显示大图

这是一个简单的Demo，目的是：读取文件夹下图片生成略缩图并点击显示大图。

先新建一个工程，创建一个ThumbnailsWindows的类，继承LinearLayout。代码如下：

[java]
<span style="font-size:16px;"><span style="font-size: 16px; ">package org.winplus.thum.view;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import cn.embel.thum.R;

public class ThumbnailsWindows extends LinearLayout {

    private static final String TAG = "ThumbnailsWindows";
    private Context mContext;
    private static ArrayList<String> paths = new ArrayList<String>();

    private ImageView imageView;

    public ThumbnailsWindows(Context context) {
        super(context);
        mContext = context;
        setupViews();
    }

    public ThumbnailsWindows(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        setupViews();
    }

    public void setupViews() {

        /**
         * 显示大图时需要使用，当然可以直接在此类中定义！这样还好控制一些~到时候再改吧，赶这过年呢
         */
        final LayoutInflater mLayoutInflater = LayoutInflater.from(getContext());
        View v = mLayoutInflater.inflate(R.layout.original_photo, null);
        imageView = (ImageView) v.findViewById(R.id.original);

        Map<String,Bitmap> maps = new TreeMap<String, Bitmap>();
        try {
            maps = buildThum();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        Iterator<String> it = maps.keySet().iterator();
        int i = 0;
        while (it.hasNext()) {
            String path = (String) it.next();
            Bitmap bm = maps.get(path);

            ImageButton image = new ImageButton(mContext);
            image.setImageBitmap(bm);
            image.setId(i++);
            addView(image);
            image.setOnTouchListener(listener);
        }

        addView(v);
    }

    /**
     * 定义按钮控件的Touch事件
     */
    OnTouchListener listener = new OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            /**
             * 控件按下的时候显示当前略缩图的大图
             */
            if(event.getAction() == MotionEvent.ACTION_DOWN){
                String path = paths.get(v.getId());
                InputStream inputStream = null;
                try {
                    inputStream = new FileInputStream(path);
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
                Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
                imageView.setImageBitmap(bitmap);
            }
            return false;
        }
    };

    /**
     * 获取图片地址列表
     * @param file
     * @return
     */
    private static ArrayList<String> imagePath(File file) {
        ArrayList<String> list = new ArrayList<String>();

        File[] files = file.listFiles();&n

补充：移动开发 , Android ,