How to play audio continuously while orientation going to change in android

Question

I have develop application like media player to use for playing audio file from source but issue when I am change the orientation portrait to landscape button and other widget not working and other that is when I am again change orientation landscape to portrait so same issue button and seek bar is not working

my code is here

public class Aarati_Activity extends Fragment
{
    private ImageButton btnplay;
    private SeekBar seekbar;
    MediaPlayer mp;
    private ImageButton btnstop;
    private int finalTime = 0;
    private int startTime = 0;
    private int oneTimeOnly = 0;
    Handler handler=new Handler();

    public Aarati_Activity() {}

    int audiocurrent;
    int audiomax;
    private int mp_progress;    

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.activity_aarti_fragment, container, false);

        btnplay=(ImageButton)v.findViewById(R.id.btnplay);
        btnstop=(ImageButton)v.findViewById(R.id.btnstop);
        seekbar=(SeekBar)v.findViewById(R.id.seekbar);
        seekbar.setClickable(true);

        seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

                seekchange();
            }
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
            }
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {
            }
        });



        mp = MediaPlayer.create(getActivity(), R.raw.arti);
        audiomax=mp.getDuration();
        audiocurrent=mp.getCurrentPosition();

        btnstop.setOnClickListener(new OnClickListener() {


            @Override
            public void onClick(View v) {
                if(mp.isPlaying())
                {
                        mp.stop();
                        Toast.makeText(getActivity(), "Stop",Toast.LENGTH_LONG).show();
                        btnplay.setImageResource(R.drawable.ic_action_play);

                        try
                        {
                            mp.prepare();
                        } catch (IllegalStateException e) {

                            e.printStackTrace();

                        } catch (IOException e) {

                            e.printStackTrace();
                        }


                }
                    else
                    {
                        Toast.makeText(getActivity(),"Aarti Currently not playing",Toast.LENGTH_SHORT).show();
                    }

            }
        });


        btnplay.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                if(mp.isPlaying())
                {
                    mp.pause();
                    btnplay.setImageResource(R.drawable.ic_action_play);
                    Toast.makeText(getActivity(), "Pause",Toast.LENGTH_SHORT).show();
                    finalTime = mp.getDuration();
                    startTime = mp.getCurrentPosition();
                    if(oneTimeOnly == 0)

                       {
                         seekbar.setMax((int) finalTime);
                         oneTimeOnly = 1;
                       } 
                    seekbar.setProgress((int)startTime);

                    handler.postDelayed(UpdateSongTime,100);

                }
                else
                {   btnplay.setImageResource(R.drawable.ic_action_pause);
                    mp.start();
                    Toast.makeText(getActivity(), "Play",Toast.LENGTH_SHORT).show();
                    finalTime = mp.getDuration();
                    startTime = mp.getCurrentPosition();
                    if(oneTimeOnly == 0)

                      {
                         seekbar.setMax((int) finalTime);
                         oneTimeOnly = 1;
                      } 
                        seekbar.setProgress((int)startTime);

                        handler.postDelayed(UpdateSongTime,100);
                }
            }
        });

        return v;

    }   
    @SuppressLint("NewApi")
    public void seekchange()
       {
           mp_progress=seekbar.getProgress();
           mp.seekTo(mp_progress);
       }

  private Runnable UpdateSongTime = new Runnable() 
    {
     public void run()
        {
         startTime = mp.getCurrentPosition();
         seekbar.setProgress((int)startTime);
         handler.postDelayed(this, 100);
        }
    };
}

Answer 1

Basically, from the MVC (Model-View-Controller) viewpoint, an Activity is a Controller, the view hierarchy is the View, and the View and Controller get re-created each time the orientation changes. Meanwhile, song playing belongs to the Model.

Note that an activity has the methods onSaveInstanceState(Bundle) and onCreate(Bundle), and if the bundle passed to onCreate() is not null, it contains the information previously stored by onSaveInstanceState(). And there's also onRetainNonConfigurationInstance(). When the screen turns, the old activity is destroyed and a new activity is created, and these methods let the old activity pass important data to the new one.

Even after you create a service, you have to keep this MVC stuff in mind.

Answer 2

You need to use Service to play song. It will allow you to play song even when app is in background Tutorial