Android Open Source - AndroidRatesAPISample Main Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.oanda.APISample;
/*from   ww  w. j a  v a 2 s .c  o  m*/
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

public class MainActivity extends Activity {

    String baseURLString = "http://api-sandbox.oanda.com/";
    GetInstrumentsTask instrumentsTask;
    GetInstrumentPriceTask priceTask;
    ProgressDialog dialog;

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

        Button refreshButton = (Button) findViewById(R.id.refresh);
        refreshButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                instrumentsTask.cancel(true);
                priceTask.cancel(true);
                startInstrumentsTask();

            }
        });

        startInstrumentsTask();
    }

    private void startInstrumentsTask() {
        dialog = ProgressDialog.show(MainActivity.this, "",
                "Loading. Please wait...", true);
        instrumentsTask = new GetInstrumentsTask();
        instrumentsTask.execute((Void) null);
    }

    private void initializeListView(List<String> data) {
        dialog.dismiss();
        ListView listView = (ListView) findViewById(R.id.listview);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                R.layout.row, data);
        listView.setAdapter(adapter);
    }

    private JSONArray httpGetCall(String urlString, String jsonArrayName) {
        JSONArray result = null;
        HttpClient client = new DefaultHttpClient();
        HttpGet request = new HttpGet(urlString);
        try {
            HttpResponse getResponse = client.execute(request);
            BufferedReader reader = new BufferedReader(
                    new InputStreamReader(
                            getResponse.getEntity().getContent(), "UTF-8"));
            StringBuilder builder = new StringBuilder();
            for (String line = null; (line = reader.readLine()) != null;) {
                builder.append(line).append("\n");
            }
            result = new JSONObject(builder.toString()).getJSONArray(jsonArrayName);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    public class GetInstrumentPriceTask extends
            AsyncTask<Void, Void, JSONArray> {
        String urlString = baseURLString + "v1/prices?instruments=";
        String pair;

        public GetInstrumentPriceTask(List<String> pairs) {
 
/*
Commented out because instruments returns invalid pairs for quote (fix in progress)
            StringBuffer buffer = new StringBuffer();
            for (String pair : pairs) {
                buffer.append(pair).append("%2C");
            }
            urlString += buffer.toString();
*/
            urlString += "EUR_USD%2CEUR_CAD%2CUSD_CAD%2CUSD_JPY%2CEUR_GBP%2CCAD_JPY%2CGBP_USD%2CGBP_CAD";
        }



        @Override
        protected JSONArray doInBackground(Void... arg0) {
            return httpGetCall(urlString, "prices");
        }

        @Override
        protected void onPostExecute(JSONArray result) {
            ArrayList<String> listCellText = new ArrayList<String>();
            try {
                for (int i = 0; i < result.length(); i++) {
                    JSONObject obj = result.getJSONObject(i);
                    listCellText.add(obj.getString("instrument")
                            + "\nBid Price:"
                            + obj.getString("bid") + "\nAsk Price:"
                            + obj.getString("ask"));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            initializeListView(listCellText);
        }
    }

    public class GetInstrumentsTask extends AsyncTask<Void, Void, JSONArray> {
        String urlString = baseURLString + "v1/instruments";

        @Override
        protected JSONArray doInBackground(Void... arg0) {
            return httpGetCall(urlString, "instruments");
        }
        @Override
        protected void onPostExecute(JSONArray instrumentResult) {
            final ArrayList<String> instruments = new ArrayList<String>();
            for (int i = 0; i < instrumentResult.length(); i++) {
                try {
                    JSONObject obj = instrumentResult.getJSONObject(i);
                    instruments.add(obj.getString("instrument"));
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
            priceTask = new GetInstrumentPriceTask(instruments);
            priceTask.execute((Void) null);
        }
    }
}

Java Source Code List

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