MainActivity.java Source code

Introduction

Here is the source code for MainActivity.java

Source

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.text.method.ScrollingMovementMethod;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import java.util.List;

import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.conf.ConfigurationBuilder;

public class MainActivity extends Activity {
    TextView textViewCountChars, textViewTimeline;
    EditText editTextTweet, editTextUsername;

    Twitter twitter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editTextTweet = (EditText) findViewById(R.id.editTextTweet);
        editTextTweet.addTextChangedListener(new MyTextWatcher());
        textViewCountChars = (TextView) findViewById(R.id.textViewCountChars);
        editTextUsername = (EditText) findViewById(R.id.editTextUsername);
        textViewTimeline = (TextView) findViewById(R.id.textViewTimeline);
        textViewTimeline.setMovementMethod(new ScrollingMovementMethod());

        ConfigurationBuilder builder = new ConfigurationBuilder();
        builder.setOAuthConsumerKey("TYPE YOUR OWN VALUE HERE").setOAuthConsumerSecret("TYPE YOUR OWN VALUE HERE")
                .setOAuthAccessToken("TYPE YOUR OWN VALUE HERE")
                .setOAuthAccessTokenSecret("TYPE YOUR OWN VALUE HERE");

        TwitterFactory factory = new TwitterFactory(builder.build());
        twitter = factory.getInstance();
    }

    // Button click listeners

    public void onTweetButtonClick(View view) {
        new MyAsyncTaskTweet().execute(editTextTweet.getText().toString());
    }

    public void onTimelineButtonClick(View view) {
        new MyAsyncTaskTimeline().execute(editTextUsername.getText().toString());
    }

    // Count characters in the Tweet field

    class MyTextWatcher implements TextWatcher {

        @Override
        public void afterTextChanged(Editable s) {
            textViewCountChars.setText("" + editTextTweet.getText().length());
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }

    }

    // The AsyncTask classes

    public class MyAsyncTaskTweet extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... tweet) {
            String result = "";

            try {

                twitter.updateStatus(tweet[0]);
                result = getResources().getString(R.string.success);

            } catch (TwitterException twitterException) {
                result = getResources().getString(R.string.twitter_failure);
            } catch (Exception e) {
                result = getResources().getString(R.string.general_failure);
            }

            return result;
        }

        @Override
        protected void onPostExecute(String result) {
            editTextTweet.setHint(result);
            editTextTweet.setText("");
        }
    }

    public class MyAsyncTaskTimeline extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... username) {
            String result = new String("");
            List<twitter4j.Status> statuses = null;

            try {

                statuses = twitter.getUserTimeline(username[0]);

            } catch (TwitterException twitterException) {
                result = getResources().getString(R.string.twitter_failure);
            } catch (Exception e) {
                result = getResources().getString(R.string.general_failure);
            }

            for (twitter4j.Status status : statuses) {
                result += status.getText();
                result += "\n";
            }
            return result;
        }

        @Override
        protected void onPostExecute(String result) {
            editTextUsername.setText("");
            textViewTimeline.setText(result);
        }
    }
}