Question

So i have this code:

public class StreamingMp3Player extends Activity implements OnClickListener, OnTouchListener, OnCompletionListener, OnBufferingUpdateListener, OnItemSelectedListener{
    TextView textMsg, textPrompt;
    ImageView imageView;
    final String textSource = "http://www.sdads.ro/sdsad.php";
    private ImageButton buttonPlayPause;
    protected EditText editTextSongURL;

    private MediaPlayer mediaPlayer;

    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            moveTaskToBack(true);
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Spinner spinner = (Spinner) findViewById(R.id.spinner);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                this, R.array.planets_array, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);

        Button btn1 = (Button) findViewById(R.id.btn1);
        btn1.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub
                finish();
                System.exit(0);
            }
        });

        imageView = (ImageView) findViewById(R.id.imagine);
        textPrompt = (TextView)findViewById(R.id.textprompt);
        textMsg = (TextView)findViewById(R.id.textmsg);
        textMsg.post( new Runnable(){

            public void run(){


        URL textUrl;
        try {

            textUrl = new URL(textSource);
            BufferedReader bufferReader = new BufferedReader(new InputStreamReader(textUrl.openStream()));
            String StringBuffer;
            String stringText = "";
            while ((StringBuffer = bufferReader.readLine()) != null) {
                stringText += StringBuffer;
            }
            bufferReader.close();
            textMsg.setText(stringText);
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            textMsg.setText(e.toString());
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            textMsg.setText(e.toString());
        }
        textMsg.postDelayed(this,(1000*10));
            }

        });


        initView();
        spinner.setOnItemSelectedListener(new StreamingMp3Player());
    }




    private void initView() {

        buttonPlayPause = (ImageButton)findViewById(R.id.ButtonTestPlayPause);
        buttonPlayPause.setOnClickListener(this);


        editTextSongURL = (EditText)findViewById(R.id.EditTextSongURL);
        editTextSongURL.setText("Romantic FM");

        mediaPlayer = new MediaPlayer();
        mediaPlayer.setOnBufferingUpdateListener(this);
        mediaPlayer.setOnCompletionListener(this);
    }



    public void onClick(View v) {
        if(v.getId() == R.id.ButtonTestPlayPause){

            try {
                mediaPlayer.setDataSource("http://dfgdgfdgf:8080"); 

                mediaPlayer.prepare(); 
            } catch (Exception e) {
                e.printStackTrace();
            }

            //mediaFileLengthInMilliseconds = mediaPlayer.getDuration(); 

            if(!mediaPlayer.isPlaying()){
                mediaPlayer.start();
                //buttonPlayPause.setBackgroundColor(Color.RED);
                buttonPlayPause.setImageResource(R.drawable.button_pause);
            }else {
                mediaPlayer.pause();
                buttonPlayPause.setImageResource(R.drawable.button_play);
                //System.out.println("Pauza");

            }


        }
    }

     public void onItemSelected(AdapterView<?> parent,
                View view, int pos, long id) {
            if(pos == 1) {
                mediaPlayer.pause();
            }

            }

            public void onNothingSelected(AdapterView parent) {
              // Do nothing.
            }

    public void onCompletion(MediaPlayer mp) {

        buttonPlayPause.setImageResource(R.drawable.button_play);

    }


    public void onBufferingUpdate(MediaPlayer arg0, int arg1) {
        // TODO Auto-generated method stub

    }


    public boolean onTouch(View arg0, MotionEvent arg1) {
        // TODO Auto-generated method stub
        return false;
    }



}

And this code, is where i get the value from the spinner:

public void onItemSelected(AdapterView<?> parent,
                View view, int pos, long id) {
            if(pos == 1) {
                mediaPlayer.pause();
            }

            }

            public void onNothingSelected(AdapterView parent) {
              // Do nothing.
            }

It is supposed to pause mediaplayer, instead i get error.This is from logcat:

05-27 12:39:05.554: E/AndroidRuntime(1432): FATAL EXCEPTION: main
05-27 12:39:05.554: E/AndroidRuntime(1432): java.lang.NullPointerException
05-27 12:39:05.554: E/AndroidRuntime(1432):     at com.hrupin.streamingmedia.StreamingMp3Player.onItemSelected(StreamingMp3Player.java:161)
05-27 12:39:05.554: E/AndroidRuntime(1432):     at android.widget.AdapterView.fireOnSelected(AdapterView.java:871)
05-27 12:39:05.554: E/AndroidRuntime(1432):     at android.widget.AdapterView.access$200(AdapterView.java:42)
05-27 12:39:05.554: E/AndroidRuntime(1432):     at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:837)
05-27 12:39:05.554: E/AndroidRuntime(1432):     at android.os.Handler.handleCallback(Handler.java:587)
05-27 12:39:05.554: E/AndroidRuntime(1432):     at android.os.Handler.dispatchMessage(Handler.java:92)
05-27 12:39:05.554: E/AndroidRuntime(1432):     at android.os.Looper.loop(Looper.java:123)
05-27 12:39:05.554: E/AndroidRuntime(1432):     at android.app.ActivityThread.main(ActivityThread.java:3683)
05-27 12:39:05.554: E/AndroidRuntime(1432):     at java.lang.reflect.Method.invokeNative(Native Method)
05-27 12:39:05.554: E/AndroidRuntime(1432):     at java.lang.reflect.Method.invoke(Method.java:507)
05-27 12:39:05.554: E/AndroidRuntime(1432):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-27 12:39:05.554: E/AndroidRuntime(1432):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-27 12:39:05.554: E/AndroidRuntime(1432):     at dalvik.system.NativeStart.main(Native Method)

So what am i doing wrong? What is causing the app to crash when i select the spinner value which is supposed to pause mediaplayer?

Answer 1

Your Spinner object is declared in the OnCreate() method which is totally hidden from the onItemSelected() method, just declare it on class level below the MediaPlayer object, like below,

 private MediaPlayer mediaPlayer;
 private Spinner spinner;