android那些事之Bitmap、InputStream、Drawable、byte[]、Base64之间的转换关系

          // 将Bitmap转换成InputStream(压缩率quality、100表示不压缩、10表示压缩90%)
          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;
          }
          
          // 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;
          }
          
          // 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;
          }
          
          //将Bitmap转换成Base64
          public  String getImgStr(Bitmap bit){
             ByteArrayOutputStream bos=new ByteArrayOutputStream();
             bit.compress(CompressFormat.JPEG,  100, bos);//参数100表示不压缩
             byte[] bytes=bos.toByteArray();
             return Base64.encodeToString(bytes, Base64.DEFAULT);
          }   
               
          //将Base64转换成bitmap
          public  Bitmap getimg(String str){
              byte[] bytes;
              bytes=Base64.decode(str,   0);
              return BitmapFactory.decodeByteArray(bytes,   0, bytes.length);
          }   

最近遇到比较多的转换关系，所以就整理下贴出来与大家分享咯。。。