Android 笔记：Android将图像转换成流存储与将流转换成图像

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1、将图片转换成二进制流

public byte[] getBitmapByte(Bitmap bitmap){      ByteArrayOutputStream out = new ByteArrayOutputStream();      //参数1转换类型，参数2压缩质量，参数3字节流资源    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);      try {          out.flush();          out.close();      } catch (IOException e) {          e.printStackTrace();      }      return out.toByteArray();  }

2、将二进制流转换成图片（Bitmap）

public Bitmap getBitmapFromByte(byte[] temp){      if(temp != null){          Bitmap bitmap = BitmapFactory.decodeByteArray(temp, 0, temp.length);          return bitmap;      }else{          return null;      }  }

将二进制流转换成图片（Drawable）

public Drawable getBitmapFromByte(byte[] temp){      if(temp != null){          Drawable drawable = Drawable.createFromStream(bais, "image");        return drawable ;      }else{          return null;      }  }

3、将Bitmap转换成Drawable

public static Bitmap drawableToBitmap(Drawable drawable){                int width = drawable.getIntrinsicWidth();                int height = drawable.getIntrinsicHeight();                Bitmap bitmap = Bitmap.createBitmap(width, height,                        drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888                                : Bitmap.Config.RGB_565);                Canvas canvas = new Canvas(bitmap);                drawable.setBounds(0,0,width,height);                drawable.draw(canvas);                return bitmap;            }

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