Sample radio streaming implementation with MediaPlayer (Android Activity)

SampleRadioStreamingActivity.java

import android.media.AudioManager;
import android.media.MediaPlayer;
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.CompoundButton;
import android.widget.Toast;
import android.widget.ToggleButton;
import java.io.IOException;

public class SampleRadioStreamingActivity extends AppCompatActivity {

    Button b_play;
    MediaPlayer mediaPlayer;
    String stream_rock = "http://stream.radioreklama.bg:80/radio1rock128";
    String stream_pop = "http://stream.radiorecord.ru:8100/rr_aac";
    String stream;
    Button b_1, b_2;
    boolean prepared = false;
    boolean started = false;

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

        b_1 = (Button) findViewById(R.id.b_1);
        b_2 = (Button) findViewById(R.id.b_2);
        b_2.setEnabled(false);
        b_play = (Button) findViewById(R.id.b_play);
        b_play.setEnabled(false);
        b_play.setText("SELECT STATION");
        mediaPlayer = new MediaPlayer();
        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

        b_1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                stream = stream_rock;
                b_play.setText("LOADING");
                new PlayerTask().execute(stream);
                b_1.setEnabled(false);
            }
        });
        b_2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                stream = stream_pop;
                b_play.setText("LOADING");
                new PlayerTask().execute(stream);
            }
        });


        b_play.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(started){
                    started = false;
                    mediaPlayer.pause();
                    b_play.setText("PLAY");
                } else {
                    started = true;
                    mediaPlayer.start();
                    b_play.setText("PAUSE");
                }
            }
        });
    }

    class PlayerTask extends AsyncTask<String, Void, Boolean> {
        @Override
        protected Boolean doInBackground(String... strings) {
            try {
                mediaPlayer.setDataSource(strings[0]);
                mediaPlayer.prepare();
                prepared = true;
            } catch (IOException e) {
                e.printStackTrace();
                Toast.makeText(SampleRadioStreamingActivity.this, "RADIO BUFFER FAILED!", Toast.LENGTH_SHORT).show();
            }
            return prepared;
        }

        @Override
        protected void onPostExecute(Boolean aBoolean){
            super.onPostExecute(aBoolean);
            b_play.setEnabled(true);
            b_play.setText("PLAY");
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        if(started){
            mediaPlayer.pause();
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        if(started){
            mediaPlayer.start();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if(prepared){
            mediaPlayer.release();
        }
    }
}