Connect native Android app to Watson Sentiment Analysis in under 10 minutes

gistfile1.txt

package com.ibm.sentimentsensitiveapp;

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.util.HashMap;
import java.util.Map;


//adding Watson Developer Cloud SDK for Java:
import com.ibm.watson.developer_cloud.alchemy.v1.AlchemyLanguage;
import com.ibm.watson.developer_cloud.alchemy.v1.model.DocumentSentiment;

public class MainActivity extends AppCompatActivity {

    TextView textView;
    EditText editText;
    Button button;
    String sentiment;

    private class AskWatsonTask extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... textsToAnalyse) {

            System.out.println(editText.getText());

            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    textView.setText("what is happening inside a thread - we are running Watson AlchemyAPI");
                }
            });
            AlchemyLanguage service = new AlchemyLanguage();
            service.setApiKey("<here goes AlchemyAPI key from Bluemix>");

            Map<String, Object> params = new HashMap<String, Object>();
            params.put(AlchemyLanguage.TEXT, editText.getText());
            DocumentSentiment sentiment = service.getSentiment(params).execute();
            System.out.println(sentiment);

            //passing the result to be displayed at UI in the main tread
            return sentiment.getSentiment().getType().name();
        }

        //setting the value of UI outside of the thread
        @Override
        protected void onPostExecute(String result) {
            textView.setText("The message's sentiment is: " + result);
        }
    }

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

        //initialize UI parameters
        textView = (TextView) findViewById(R.id.textView);
        editText = (EditText) findViewById(R.id.editText);
        button = (Button) findViewById(R.id.button);

        //fire action when button is pressed
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                System.out.println("Logging to the console that the button pressed for the text : " + editText.getText());
                textView.setText("Displaying at UI the sentiment to be checked for : " + editText.getText());

                AskWatsonTask task = new AskWatsonTask();
                task.execute(new String[]{});
            }
        });
    }
}