LEER JSON

protected void onPostExecute(String s) {
            super.onPreExecute();
            String salida="";
            try {
                JSONArray consulta = new JSONArray(s);
                JSONObject a[]=new JSONObject[consulta.length()];
                for(int i=0;i<consulta.length();i++){
                    a[i]=consulta.getJSONObject(i);
                }

                for(JSONObject o : a)
                    salida+=o.getString("nombreH") +"\n---*'*---\n";


                tv.setText(salida);
            }
            catch(Exception e){
                tv.setText(e.getMessage());
            }

        }


===============================================================

package com.example.imageviewfromurl;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;

import com.squareup.picasso.Picasso;

public class MainActivity extends AppCompatActivity {

    ImageView im;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        im=(ImageView)findViewById(R.id.imageView);

        Picasso.get().load("http:\\/\\/cerroazul2020.000webhostapp.com\\/images\\/011blw_ons_crd_03.jpg").into(im);

    }
}


Agregar implementatiom de librería picasso en 
build.gradle (Module:app)

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.squareup.picasso:picasso:2.71828'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}