android 将图片内容解析成字节数组,将字节数组转换为ImageView

  1 package com.bingo.util;
  2 
  3 import java.io.BufferedOutputStream;
  4 import java.io.ByteArrayOutputStream;
  5 import java.io.File;
  6 import java.io.FileOutputStream;
  7 import java.io.IOException;
  8 import java.io.InputStream;
  9 
 10 import android.graphics.Bitmap;
 11 import android.graphics.BitmapFactory;
 12 import android.graphics.Matrix;
 13 
 14 public class ImageDispose {
 15         
 16         
 17         
 18         /**
 19          * @param 将图片内容解析成字节数组
 20          * @param inStream
 21          * @return byte[]
 22          * @throws Exception
 23 */
 24         public static byte[] readStream(InputStream inStream) throws Exception {
 25                 byte[] buffer = new byte[1024];
 26                 int len = -1;
 27                 ByteArrayOutputStream outStream = new ByteArrayOutputStream();
 28                 while ((len = inStream.read(buffer)) != -1) {
 29                         outStream.write(buffer, 0, len);
 30                 }
 31                 byte[] data = outStream.toByteArray();
 32                 outStream.close();
 33                 inStream.close();
 34                 return data;
 35 
 36         }
 37         /**
 38          * @param 将字节数组转换为ImageView可调用的Bitmap对象
 39          * @param bytes
 40          * @param opts
 41          * @return Bitmap
 42 */
 43         public static Bitmap getPicFromBytes(byte[] bytes,
 44                         BitmapFactory.Options opts) {
 45                 if (bytes != null)
 46                         if (opts != null)
 47                                 return BitmapFactory.decodeByteArray(bytes, 0, bytes.length,
 48                                                 opts);
 49                         else
 50                                 return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
 51                 return null;
 52         }
 53         /**
 54          * @param 图片缩放
 55          * @param bitmap 对象
 56          * @param w 要缩放的宽度
 57          * @param h 要缩放的高度
 58          * @return newBmp 新 Bitmap对象
 59 */
 60         public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h){
 61                 int width = bitmap.getWidth();
 62                 int height = bitmap.getHeight();
 63                 Matrix matrix = new Matrix();
 64                 float scaleWidth = ((float) w / width);
 65                 float scaleHeight = ((float) h / height);
 66                 matrix.postScale(scaleWidth, scaleHeight);
 67                 Bitmap newBmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,
 68                                 matrix, true);
 69                 return newBmp;
 70         }
 71         
 72         /**
 73      * 把Bitmap转Byte
 74      * @Author HEH
 75      * @EditTime 2010-07-19 上午11:45:56
 76 */
 77         public static byte[] Bitmap2Bytes(Bitmap bm){
 78                 ByteArrayOutputStream baos = new ByteArrayOutputStream();
 79                 bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
 80                 return baos.toByteArray();
 81         }
 82         /**
 83      * 把字节数组保存为一个文件
 84      * @Author HEH
 85      * @EditTime 2010-07-19 上午11:45:56
 86 */
 87     public static File getFileFromBytes(byte[] b, String outputFile) {
 88         BufferedOutputStream stream = null;
 89         File file = null;
 90         try {
 91             file = new File(outputFile);
 92             FileOutputStream fstream = new FileOutputStream(file);
 93             stream = new BufferedOutputStream(fstream);
 94             stream.write(b);
 95         } catch (Exception e) {
 96             e.printStackTrace();
 97         } finally {
 98             if (stream != null) {
 99                 try {
100                     stream.close();
101                 } catch (IOException e1) {
102                     e1.printStackTrace();
103                 }
104             }
105         }
106         return file;
107     }
108                 
109 }

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