#android #AsyncTask #marvel

152e0d84b3529dd743e3.md

Fetching Marvel Characters. Andriod

Communuty developer.marvel.com

MainActivity.java

package com.example.user.adroidtest;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

    protected void onCreate(Bundle saveInstanceState) {
        super.onCreate(saveInstanceState);
        new RequestTask().execute("timestamp");
    }
}

md5.java

package com.example.user.adroidtest;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Created by http://stackoverflow.com/a/4846511/1393023
 */
public class md5 {
    public static final String md5(final String s) {
        final String MD5 = "MD5";
        try {
            // Create MD5 Hash
            MessageDigest digest = java.security.MessageDigest
                    .getInstance(MD5);
            digest.update(s.getBytes());
            byte messageDigest[] = digest.digest();

            // Create Hex String
            StringBuilder hexString = new StringBuilder();
            for (byte aMessageDigest : messageDigest) {
                String h = Integer.toHexString(0xFF & aMessageDigest);
                while (h.length() < 2)
                    h = "0" + h;
                hexString.append(h);
            }
            return hexString.toString();

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return "";
    }
}

RequestTask.java

package com.example.user.adroidtest;

import android.net.Uri;
import android.os.AsyncTask;
import android.util.Log;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Created by User on 28.05.2015.
 */
class RequestTask extends AsyncTask<String, Void, String> {
    private final String LOG_TAG = RequestTask.class.getSimpleName();

    @Override
    protected String doInBackground(String... params) {
        if (params.length == 0) {
            return null;
        }

        HttpURLConnection urlConnection = null;
        BufferedReader reader = null;

        String jsonStr = null;
        String privateKey = "{PRIVATE_KEY}";
        String apiKey = "{API_KEY}";

        try {

            final String BASE_URL = "http://gateway.marvel.com/v1/public/characters?";
            final String TS_PARAM = "ts";
            final String API_KEY_PARAM = "apikey";
            final String HASH_PARAM = "hash";

            Uri builtUri = Uri.parse(BASE_URL).buildUpon()
                    .appendQueryParameter(TS_PARAM, params[0])
                    .appendQueryParameter(API_KEY_PARAM, apiKey)
                    .appendQueryParameter(HASH_PARAM, md5.md5(params[0] + privateKey + apiKey))
                    .build();

            URL url = new URL(builtUri.toString());

            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.connect();

            // Read the input stream into a String
            InputStream inputStream = urlConnection.getInputStream();
            StringBuffer buffer = new StringBuffer();
            if (inputStream == null) {
                // Nothing to do.
                return null;
            }
            reader = new BufferedReader(new InputStreamReader(inputStream));

            String line;
            while ((line = reader.readLine()) != null) {
                buffer.append(line + "\n");
            }

            if (buffer.length() == 0) {
                return null;
            }
            jsonStr = buffer.toString();
        } catch (IOException e) {
            Log.e(LOG_TAG, "Error ", e);
            return null;
        } finally {
            if (urlConnection != null) {
                urlConnection.disconnect();
            }
            if (reader != null) {
                try {
                    reader.close();
                } catch (final IOException e) {
                    Log.e(LOG_TAG, "Error closing stream", e);
                }
            }
        }
        Log.i(LOG_TAG, jsonStr);
        return jsonStr;
    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        //Do anything with response..
    }
}