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

              1
            //
             将Bitmap转换成InputStream(压缩率quality、100表示不压缩、10表示压缩90%)
              2
            public InputStream Bitmap2InputStream(Bitmap bm, int quality) {
  3               ByteArrayOutputStream baos = new ByteArrayOutputStream();
  4              bm.compress(Bitmap.CompressFormat.PNG, quality, baos);
  5               InputStream is = new ByteArrayInputStream(baos.toByteArray());
  6return is;
  7          }
  8  9// 将Bitmap转换成InputStream 10public InputStream Bitmap2InputStream(Bitmap bm) {
 11               ByteArrayOutputStream baos = new ByteArrayOutputStream();
 12               bm.compress(Bitmap.CompressFormat.JPEG, 100, baos);
 13               InputStream is = new ByteArrayInputStream(baos.toByteArray());
 14return is;
 15          }
 16 17// 将InputStream转换成Bitmap 18public Bitmap InputStream2Bitmap(InputStream is) {
 19return BitmapFactory.decodeStream(is);
 20          }
 21 22// Drawable转换成InputStream 23public InputStream Drawable2InputStream(Drawable d) {
 24               Bitmap bitmap = this.drawable2Bitmap(d);
 25returnthis.Bitmap2InputStream(bitmap);
 26          }
 27 28// InputStream转换成Drawable 29public Drawable InputStream2Drawable(InputStream is) {
 30               Bitmap bitmap = this.InputStream2Bitmap(is);
 31returnthis.bitmap2Drawable(bitmap);
 32          }
 33 34// Drawable转换成byte[] 35publicbyte[] Drawable2Bytes(Drawable d) {
 36               Bitmap bitmap = this.drawable2Bitmap(d);
 37returnthis.Bitmap2Bytes(bitmap);
 38          }
 39 40// byte[]转换成Drawable 41public Drawable Bytes2Drawable(byte[] b) {
 42               Bitmap bitmap = this.Bytes2Bitmap(b);
 43returnthis.bitmap2Drawable(bitmap);
 44          }
 45 46// Bitmap转换成byte[] 47publicbyte[] Bitmap2Bytes(Bitmap bm) {
 48               ByteArrayOutputStream baos = new ByteArrayOutputStream();
 49               bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
 50return baos.toByteArray();
 51          }
 52 53// byte[]转换成Bitmap 54public Bitmap Bytes2Bitmap(byte[] b) {
 55if (b.length !=   0) {
 56return BitmapFactory.decodeByteArray(b,   0, b.length);
 57              }
 58returnnull;
 59          }
 60 61// 将byte[]转换成InputStream 62public InputStream Byte2InputStream(byte[] b) {
 63               ByteArrayInputStream bais = new ByteArrayInputStream(b);
 64return bais;
 65          }
 66 67// 将InputStream转换成byte[] 68publicbyte[] InputStream2Bytes(InputStream is) {
 69               String str = "";
 70byte[] readByte = newbyte[1024];
 71int readCount = -  1;
 72try {
 73while ((readCount = is.read(readByte,   0, 1024)) != -  1) {
 74                       str += new String(readByte).trim();
 75                  }
 76return str.getBytes();
 77               } catch (Exception e) {
 78                  e.printStackTrace();
 79              }
 80returnnull;
 81          }
 82 83// Drawable转换成Bitmap 84public Bitmap drawable2Bitmap(Drawable drawable) {
 85               Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
 86                       drawable.getIntrinsicHeight(), drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
 87               Canvas canvas = new Canvas(bitmap);
 88               drawable.setBounds(  0,   0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
 89              drawable.draw(canvas);
 90return bitmap;
 91          }
 92 93// Bitmap转换成Drawable 94public Drawable bitmap2Drawable(Bitmap bitmap) {
 95               BitmapDrawable bd = new BitmapDrawable(bitmap);
 96               Drawable d = (Drawable) bd;
 97return d;
 98          }
 99100//将Bitmap转换成Base64101public  String getImgStr(Bitmap bit){
102              ByteArrayOutputStream bos=new ByteArrayOutputStream();
103              bit.compress(CompressFormat.JPEG,  100, bos);//参数100表示不压缩104byte[] bytes=bos.toByteArray();
105return Base64.encodeToString(bytes, Base64.DEFAULT);
106          }   
107108//将Base64转换成bitmap109public  Bitmap getimg(String str){
110byte[] bytes;
111               bytes=Base64.decode(str,   0);
112return BitmapFactory.decodeByteArray(bytes,   0, bytes.length);
113           }