android传送图片和图片与byte转换

activity 之间直接传递图片时  Intent intent = new Intent(this, NewActivity.class);  intent.putExtra("BitmapImage", bitmap);  Bitmap bitmap = (Bitmap) intent.getParcelableExtra("BitmapImage");去掉seekBarBackground  创建一个blank drawable 然后satBar.setProgressDrawable(invisibleBackground);  也许这样也可以setBackgroundDrawable(null)1、Drawable → Bitmappublic static Bitmap drawableToBitmap(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);          //canvas.setBitmap(bitmap);          drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());          drawable.draw(canvas);          return bitmap;  } public static Bitmap drawableToBitmap(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);        //canvas.setBitmap(bitmap);        drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());        drawable.draw(canvas);        return bitmap;}2、从资源中获取BitmapJava代码 Resources res=getResources();   Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic); Resources res=getResources();Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);3、Bitmap → byte[]Java代码 private byte[] Bitmap2Bytes(Bitmap bm){      ByteArrayOutputStream baos = new ByteArrayOutputStream();        bm.compress(Bitmap.CompressFormat.PNG, 100, baos);        return baos.toByteArray();     } private byte[] Bitmap2Bytes(Bitmap bm){    ByteArrayOutputStream baos = new ByteArrayOutputStream();     bm.compress(Bitmap.CompressFormat.PNG, 100, baos);     return baos.toByteArray();   }4、 byte[] → BitmapJava代码 private Bitmap Bytes2Bimap(byte[] b){              if(b.length!=0){                  return BitmapFactory.decodeByteArray(b, 0, b.length);              }              else {                  return null;              }        }  

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