Question

我想知道在执行Android应用时如何跳转到另一行代码。

这是我的问题。

首先，这是我的代码： - 。

    listView.setOnItemClickListener

            (new AdapterView.OnItemClickListener() {

                 @Override

                 public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {







                         int Current_Song;

                         Songs song = Song.get(i);



                         //If mediaPlayer is not used before, this will make oldsong as present song.

                         if (Old_Song == -326523) {

                             Old_Song = song.getSong();

                         }



                         Current_Song = song.getSong();



                         ImageView IVP_P = (ImageView) findViewById(R.id.P_PImage);





                         //If mediaPlayer is paused.

                         if (IsPaused) {

                             P_and_P.setImageResource(R.drawable.ic_pause_white_48dp);

                             //If the song paused is same as the new song.

                             if (Current_Song == Old_Song) {



                                 mediaplayer.start();

                             }



                             //If the song Paused is not the new song.

                             else {

                                 if (mediaplayer != null) {

                                     mediaplayer.release();

                                     mediaplayer = null;

                                 }



                                 int result = mAudioManager.requestAudioFocus(mOnAudioFocusChangeListener, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);



                                 if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {

                                     mediaplayer = mediaplayer.create(SongsListActivity.this, song.getSong());

                                     Old_Song = song.getSong();

                                     NameD.setText(song.getNameOfSong());

                                     RateD.setText(song.getDeveloperRate());

                                     ImageD.setImageResource(song.getImage());

                                     mediaplayer.start();

                                     mediaplayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

                                         @Override

                                         public void onCompletion(MediaPlayer mediaPlayer) {

                                             P_and_P.setImageResource(R.drawable.ic_play_arrow_white_48dp);

                                             IsPaused = true;

                                         }

                                     });

                                 }

                             }

                             IsPaused = false;



                         } else if (mediaplayer != null) {

                             //If mediaPlayer is already Playing a song.

                             if (mediaplayer.isPlaying()) {

                                 P_and_P.setImageResource(R.drawable.ic_play_arrow_white_48dp);

                                 mediaplayer.pause();

                                 IVP_P.setImageResource(R.drawable.ic_play_arrow_black_24dp);

                                 IsPaused = true;

                             }

                         }



                         //If mediaPlayer is used for first time and if mediaPlayer is neither paused

                         else {



                             if (mediaplayer != null) {

                                 mediaplayer.release();

                                 mediaplayer = null;

                             }



                             int result = mAudioManager.requestAudioFocus(mOnAudioFocusChangeListener, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);



                             if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {

                                 mediaplayer = mediaplayer.create(SongsListActivity.this, song.getSong());

                                 Old_Song = song.getSong();

                                 NameD.setText(song.getNameOfSong());

                                 RateD.setText(song.getDeveloperRate());

                                 ImageD.setImageResource(song.getImage());

                                 mediaplayer.start();

                                 P_and_P.setImageResource(R.drawable.ic_pause_white_48dp);



                                 mediaplayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

                                     @Override

                                     public void onCompletion(MediaPlayer mediaPlayer) {

                                         P_and_P.setImageResource(R.drawable.ic_play_arrow_white_48dp);

                                         IsPaused = true;

                                         P_and_P.setImageResource(R.drawable.ic_pause_white_48dp);



                                     }

                                 });

                             }

                         }



                     }



             }

            );

现在，每当执行进入任何onCompletion（）方法时，我都希望执行从onItemClick（）方法的开头开始执行。

我该怎么办？

更详细： -

这里我的应用程序使用ListView和Adapter显示歌曲列表。歌曲的细节存储在一个arrayList中（如你所能看到的）。当一个项目被点击时，它获取该项目的位置，然后引用arrayList的相应元素，获取相应歌曲的位置然后播放那首歌。我想要的是，当一首歌结束，并调用onCompletion（）方法时，我想增加i的值（在我的代码的第4行看一下），然后转到onItemClick的第一行方法

Answer 1

你所谈论的内容被称为GOTO，被广泛认为是糟糕的设计。相反，将要调用的代码提取到方法中，并从要执行它的两个（所有）位置调用它。

如何在执行Android应用程序时跳转到另一行代码

1 个答案: