PicassoTrust.java

 public static class PicassoTrustAll {

      private  static Picasso mInstance = null;

      private PicassoTrustAll(Context context) {
        
        OkHttpClient.Builder client = new OkHttpClient.Builder();
        client.hostnameVerifier(new HostnameVerifier() {
          @Override
          public boolean verify(String s, SSLSession sslSession) {
            return true;
          }
        });
        TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
          @Override
          public void checkClientTrusted(
              java.security.cert.X509Certificate[] x509Certificates,
              String s) throws java.security.cert.CertificateException {
          }

          @Override
          public void checkServerTrusted(
              java.security.cert.X509Certificate[] x509Certificates,
              String s) throws java.security.cert.CertificateException {
          }

          @Override
          public java.security.cert.X509Certificate[] getAcceptedIssuers() {
            return new java.security.cert.X509Certificate[] {};
          }
        } };
        try {
          SSLContext sc = SSLContext.getInstance("TLS");
          sc.init(null, trustAllCerts, new java.security.SecureRandom());
          client.sslSocketFactory(sc.getSocketFactory());
        } catch (Exception e) {
          e.printStackTrace();
        }

        mInstance = new Picasso.Builder(context)
            .downloader(new OkHttp3Downloader(client.build()))
            .listener(new Picasso.Listener() {
              @Override
              public void onImageLoadFailed(Picasso picasso, Uri uri, Exception exception) {
              }
            }).build();

      }

      public static Picasso getInstance(Context context) {
        if (mInstance == null) {
          new PicassoTrustAll(context);
        }
        return mInstance;
      }
    }