音乐（活动）在旋转设备时重新启动...为什么会发生这种情况？我如何阻止它重新启动？

Question

好吧，我想我的问题描述了自己，不管怎样，这里是代码

public class  NowPlaying extends Activity implements Serializable  {
    static MediaPlayer mp =new MediaPlayer();

    String artist;ProgressDialog pd;
    int position; String key=null ;
    /*int z=0;
    SeekBar songProgressBar ;
    TextView songCurrentDurationLabel;
    TextView songTotalDurationLabel ;
    private Handler mHandler = new Handler();
    private Utilities utils=new Utilities();
    */

    @SuppressLint("NewApi")
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.now_playing);
        Intent i = getIntent();
         position=i.getIntExtra("Data2", 0);
         /* songProgressBar = (SeekBar) findViewById(R.id.songProgressBar);
          songCurrentDurationLabel = (TextView) findViewById(R.id.songCurrentDurationLabel);
          songTotalDurationLabel = (TextView) findViewById(R.id.songTotalDurationLabel);
            */

        final ArrayList<SongDetails> songs = getIntent().getParcelableArrayListExtra("Data1"); 

         pd = new ProgressDialog(this);
         pd.setMessage("Loading...");


            Playservice(songs,position  );


        Button bfake=(Button) findViewById(R.id.bFake);
        LinearLayout LL=(LinearLayout) findViewById(R.id.LL);
        Button Pause=(Button)findViewById(R.id.bPlayPause);
        // songProgressBar.setOnSeekBarChangeListener((OnSeekBarChangeListener) this); // Important

        mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer player) {

                position=position+1;



                 Playservice(songs,position);





            }});
         bfake.setOnTouchListener(new OnSwipeTouchListener()
         {           public void onSwipeRight() {
                 position=position-1;   
                 Playservice(songs,position  );
             }
                public void onSwipeLeft() {
                 position=position+1;   
                 Playservice(songs,position );
                }
                public void onSwipeBottom() {
                    mp.stop();
                }
               });
            LL.setOnTouchListener(new OnSwipeTouchListener() {
               public void onSwipeBottom() {
                    mp.stop();
                }
               });  
            Pause.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) 
            {if(mp.isPlaying())
                mp.pause();
            else
                mp.start();
            }
            });
    }

     private void Playservice( ArrayList<SongDetails> songs, int position    )

         {



         int currentPosition= 0;
            int total = mp.getDuration();
           /* while (mp!=null && currentPosition<total) {
                try {
                    Thread.sleep(1000);
                    currentPosition= mp.getCurrentPosition();
                } catch (InterruptedException e) {
                    break;
                } catch (Exception e) {
                    break;
                }            
          //      songProgressBar.setProgress(currentPosition);
            */





          try {
                 String ab=songs.get(position).getPath2().toString();
                 artist=songs.get(position).getArtist();
                 new Xmlparse().execute(); 
                if(mp.isPlaying())
                    {   mp.stop();
                        }
                    mp.reset();
                    mp.setDataSource(ab) ;
                    mp.prepare();
                    mp.start();
            //      songProgressBar.setProgress(0);
                //  songProgressBar.setMax(mp.getDuration());
                    new Thread().start();
                } catch (IllegalArgumentException e) {

                    e.printStackTrace();
                } catch (SecurityException e) {
                    e.printStackTrace();
                } catch (IllegalStateException e) {
                    e.printStackTrace();
                } catch (IOException e)
                {
                    e.printStackTrace();
                } 


         }
     /*public void onStartTrackingTouch(SeekBar seekBar) {
        }

        public void onStopTrackingTouch(SeekBar seekBar) {
        }

        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
            if(fromUser) mp.seekTo(progress);

        }


*/
class Xmlparse extends AsyncTask<Void,Drawable,Drawable>
 {
    protected void onPostExecute(Drawable result) {
       // super.onPostExecute(result);
        pd.dismiss();
        LinearLayout LL=(LinearLayout) findViewById(R.id.LL);
         LL.setBackgroundDrawable(result);


        // Toast.makeText(getApplicationContext(),result, 1000).show();
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pd.show();
    }
    @Override
    protected Drawable doInBackground(Void... params) {
        Drawable s =getData();
        return s;
    }  

    public Drawable getData()
    {  Drawable drawable = null;//=new BitmapDrawable(bmp); 

        artist=artist.trim();
        artist=artist.replace(" ", "%20");

        try{

          URL url = new URL("http://ws.audioscrobbler.com/2.0/?method=artist.getinfo&artist=" +artist+              "&api_key=1732077d6772048ccc671c754061cb18");
        URLConnection connection = url.openConnection();
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();

        final Document document = db.parse(connection.getInputStream());
        document.getDocumentElement().normalize();
        XPathFactory xPathfactory = XPathFactory.newInstance();
        XPath xPathEvaluator = xPathfactory.newXPath();
        XPathExpression nameExpr = xPathEvaluator.compile("//lfm/artist/image");
        // XPathExpression nameExpr = xPathEvaluator.compile("//lfm/tracks/track/image");
        NodeList nl = (NodeList) nameExpr.evaluate(document, XPathConstants.NODESET);


        for (int zzz = 0; zzz < nl.getLength(); zzz++)
        {
            Node currentItem = nl.item(zzz);
            key = currentItem.getTextContent();


            // key = currentItem.getAttributes().getNamedItem("uri").getNodeValue();
        }URL ulrn = new URL(key);
        HttpURLConnection con = (HttpURLConnection)ulrn.openConnection();
        InputStream is = con.getInputStream();
        Bitmap bmp = BitmapFactory.decodeStream(is);
        drawable=new BitmapDrawable(bmp); 
        }
        catch(Exception e)
        {}
        return drawable;}   
  }}

Answer 1

它重新启动，因为您的活动已重新创建...每次用户更改设备的方向时，都会再次调用oncreate方法。要修复此问题，请将以下内容添加到清单文件中的活动中：

   android:configChanges="orientation|keyboardHidden">