图片上传

private void sendImage(Bitmap bm)
{
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bm.compress(Bitmap.CompressFormat.PNG, 60, stream);
    byte[] bytes = stream.toByteArray();
    String img = new String(Base64.encodeToString(bytes, Base64.DEFAULT));
    AsyncHttpClient client = new AsyncHttpClient();
    RequestParams params = new RequestParams();
    params.add("img", img);
    client.post("http:xxx/postIcon", params, new AsyncHttpResponseHandler() {
        @Override
        public void onSuccess(int i, Header[] headers, byte[] bytes) {
            Toast.makeText(MainActivity.this, "Upload Success!", Toast.LENGTH_LONG).show();

        }
        @Override
        public void onFailure(int i, Header[] headers, byte[] bytes, Throwable throwable) {
            Toast.makeText(MainActivity.this, "Upload Fail!", Toast.LENGTH_LONG).show();
        }
    });
}