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Byt

import java.io.BufferedOutputStream;
04.import java.io.ByteArrayOutputStream;
05.import java.io.File;
06.import java.io.FileOutputStream;
07.import java.io.IOException;
08.import java.io.InputStream;
09.
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.}