static Bitmap drawableToBitmap(Drawable drawable) // drawable 转换成bitmap
        int width = drawable.getIntrinsicWidth();// 取drawable的长宽
        int height = drawable.getIntrinsicHeight();
        Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ?Bitmap.Config.ARGB_8888:Bitmap.Config.RGB_565;// 取drawable的颜色格式
        Bitmap bitmap = Bitmap.createBitmap(width, height, config);// 建立对应bitmap
        Canvas canvas = new Canvas(bitmap);// 建立对应bitmap的画布
        drawable.setBounds(0, 0, width, height);
        drawable.draw(canvas);// 把drawable内容画到画布中
        return bitmap;
 调用代码，getDrawable过期了，但是还可以用，替换的方法暂未发现
 Bitmap bitmap = drawableToBitmap(this.getResources().getDrawable(R.drawable.ic_launcher));
2.图片转base64
 public String Bitmap2StrByBase64(Bitmap bit){
        ByteArrayOutputStream bos=new ByteArrayOutputStream();
        bit.compress(Bitmap.CompressFormat.JPEG, 40, bos);//参数100表示不压缩
        byte[] bytes=bos.toByteArray();
        return Base64.encodeToString(bytes, Base64.DEFAULT);
1.Drawable—>Bitmap
Resources res=getResources();
Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.sample_0);
Resources res=getResources();
private byte[] Bitmap2Bytes(Bitmap bm){
2.Bitmap---->Drawable
Drawable drawable =new BitmapDrawable(bmp);
3、Drawable → 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;
4、从资源中获取Bitmap
Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);
5、Bitmap → byte[]
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
    return baos.toByteArray();   }
6、 byte[] → Bitmap
   private Bitmap Bytes2Bimap(byte[] b){
                    if(b.length!=0){
                            return BitmapFactory.decodeByteArray(b, 0, b.length);
                    else {
                            return null;