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
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 */ 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 */ 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; } } 见博客文章：http://blog.csdn.net/itheima6/article/details/7516631