InputStream 与Drawable之间的互转

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;

public class FormatTools {
 private static FormatTools tools = new FormatTools();

 private FormatTools() {
 }

 public static FormatTools getInstance() {
  if (tools == null) {
   tools = new FormatTools();
   return tools;
  }
  return tools;
 }

 // 将byte[]转换成InputStream
 public InputStream Byte2InputStream(byte[] b) {
  ByteArrayInputStream bais = new ByteArrayInputStream(b);
  return bais;
 }

 // 将InputStream转换成byte[]
 public byte[] InputStream2Bytes(InputStream is) {
  String str = "";
  byte []readByte = new byte[1024];
  int readCount = -1;
  try {
   while ((readCount = is.read(readByte,0,1024)) != -1) {
    str += new String(readByte).trim();
   }
   return str.getBytes();
  } catch (Exception e) {
   e.printStackTrace();
  }
  return null;
 }

 // 将Bitmap转换成InputStream
 public InputStream Bitmap2InputStream(Bitmap bm) {
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  bm.compress(Bitmap.CompressFormat.JPEG, 100, baos);
  InputStream is = new ByteArrayInputStream(baos.toByteArray());
  return is;
 }

 // 将Bitmap转换成InputStream
 public InputStream Bitmap2InputStream(Bitmap bm, int quality) {
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  bm.compress(Bitmap.CompressFormat.PNG, quality, baos);
  InputStream is = new ByteArrayInputStream(baos.toByteArray());
  return is;
 }
 // 将InputStream转换成Bitmap
 public Bitmap InputStream2Bitmap(InputStream is) {
  return BitmapFactory.decodeStream(is);
 }

 // Drawable转换成InputStream
 public InputStream Drawable2InputStream(Drawable d) {
  Bitmap bitmap = this.drawable2Bitmap(d);
  return this.Bitmap2InputStream(bitmap);
 }

 // InputStream转换成Drawable
 public Drawable InputStream2Drawable(InputStream is) {
  Bitmap bitmap = this.InputStream2Bitmap(is);
  return this.bitmap2Drawable(bitmap);
 }

 // Drawable转换成byte[]
 public byte[] Drawable2Bytes(Drawable d) {
  Bitmap bitmap = this.drawable2Bitmap(d);
  return this.Bitmap2Bytes(bitmap);
 }

 // byte[]转换成Drawable
 public Drawable Bytes2Drawable(byte[] b) {
  Bitmap bitmap = this.Bytes2Bitmap(b);
  return this.bitmap2Drawable(bitmap);
 }

 // Bitmap转换成byte[]
 public byte[] Bitmap2Bytes(Bitmap bm) {
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
  return baos.toByteArray();
 }

 // byte[]转换成Bitmap
 public Bitmap Bytes2Bitmap(byte[] b) {
  if (b.length != 0) {
   return BitmapFactory.decodeByteArray(b, 0, b.length);
  }
  return null;
 }

 // Drawable转换成Bitmap
 public Bitmap drawable2Bitmap(Drawable drawable) {
  Bitmap bitmap = Bitmap
    .createBitmap(
      drawable.getIntrinsicWidth(),
      drawable.getIntrinsicHeight(),
      drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
        : Bitmap.Config.RGB_565);
  Canvas canvas = new Canvas(bitmap);
  drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),
    drawable.getIntrinsicHeight());
  drawable.draw(canvas);
  return bitmap;
 }

 // Bitmap转换成Drawable
 public Drawable bitmap2Drawable(Bitmap bitmap) {
  BitmapDrawable bd = new BitmapDrawable(bitmap);
  Drawable d = (Drawable) bd;
  return d;
 }
}