android 将图片内容解析成字节数组,将字节数组转换为ImageView可调用的Bitmap对象,图片缩放,把字节数组保存为一个文件,把Bitmap转Byte

package com.bingo.util;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;

public class ImageDispose {
	
	
	
	/**
	 * @param 将图片内容解析成字节数组
	 * @param inStream
	 * @return byte[]
	 * @throws Exception
	 */
	public static byte[] readStream(InputStream inStream) throws Exception {
		byte[] buffer = new byte[1024];
		int len = -1;
		ByteArrayOutputStream outStream = new ByteArrayOutputStream();
		while ((len = inStream.read(buffer)) != -1) {
			outStream.write(buffer, 0, len);
		}
		byte[] data = outStream.toByteArray();
		outStream.close();
		inStream.close();
		return data;

	}
	/**
	 * @param 将字节数组转换为ImageView可调用的Bitmap对象
	 * @param bytes
	 * @param opts
	 * @return Bitmap
	 */
	public static Bitmap getPicFromBytes(byte[] bytes,
			BitmapFactory.Options opts) {
		if (bytes != null)
			if (opts != null)
				return BitmapFactory.decodeByteArray(bytes, 0, bytes.length,
						opts);
			else
				return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
		return null;
	}
	/**
	 * @param 图片缩放
	 * @param bitmap 对象
	 * @param w 要缩放的宽度
	 * @param h 要缩放的高度
	 * @return newBmp 新 Bitmap对象
	 */
	public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h){
		int width = bitmap.getWidth();
		int height = bitmap.getHeight();
		Matrix matrix = new Matrix();
		float scaleWidth = ((float) w / width);
		float scaleHeight = ((float) h / height);
		matrix.postScale(scaleWidth, scaleHeight);
		Bitmap newBmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,
				matrix, true);
		return newBmp;
	}
	
	/**
     * 把Bitmap转Byte
     * @Author HEH
     * @EditTime 2010-07-19 上午11:45:56
     */
	public static byte[] Bitmap2Bytes(Bitmap bm){
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
		return baos.toByteArray();
	}
	/**
     * 把字节数组保存为一个文件
     * @Author HEH
     * @EditTime 2010-07-19 上午11:45:56
     */
    public static File getFileFromBytes(byte[] b, String outputFile) {
        BufferedOutputStream stream = null;
        File file = null;
        try {
            file = new File(outputFile);
            FileOutputStream fstream = new FileOutputStream(file);
            stream = new BufferedOutputStream(fstream);
            stream.write(b);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (stream != null) {
                try {
                    stream.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
        return file;
    }
		
}