在android音板中，如何在單擊另一個聲音后停止播放聲音？

Question

如何修改此設置，以便如果一個聲音已經在播放而另一聲音被單擊，則先前的聲音會停止播放，而新選擇的聲音會開始播放？ 預先感謝大家的幫助。 （這不僅是所有代碼中最重要的）

public class newBoard extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.main);

    Toast.makeText(this, "Thank you for using this App.", Toast.LENGTH_LONG).show();

    // ads - load request to display
    AdView layout = (AdView)this.findViewById(R.id.adView);

    // ads - load display with an ad
    AdRequest adRequest = new AdRequest();
    adRequest.setTesting(true);

    layout.loadAd(adRequest);

    // import sound files
    final MediaPlayer sound01 = MediaPlayer.create(this, R.raw.sound01);
    final MediaPlayer sound02 = MediaPlayer.create(this, R.raw.sound02);
    final MediaPlayer sound03 = MediaPlayer.create(this, R.raw.sound03);
    final MediaPlayer sound04 = MediaPlayer.create(this, R.raw.sound04);
    final MediaPlayer sound05 = MediaPlayer.create(this, R.raw.sound05);
    final MediaPlayer sound06 = MediaPlayer.create(this, R.raw.sound06);
    final MediaPlayer sound07 = MediaPlayer.create(this, R.raw.sound07);
    final MediaPlayer sound08 = MediaPlayer.create(this, R.raw.sound08);
    final MediaPlayer sound09 = MediaPlayer.create(this, R.raw.sound09);
    final MediaPlayer sound10 = MediaPlayer.create(this, R.raw.sound10);
    final MediaPlayer sound11 = MediaPlayer.create(this, R.raw.sound11);
    final MediaPlayer sound12 = MediaPlayer.create(this, R.raw.sound12);
    final MediaPlayer sound13 = MediaPlayer.create(this, R.raw.sound13);
    final MediaPlayer sound14 = MediaPlayer.create(this, R.raw.sound14);
    final MediaPlayer sound15 = MediaPlayer.create(this, R.raw.sound15);
    final MediaPlayer sound16 = MediaPlayer.create(this, R.raw.sound16);
    final MediaPlayer sound17 = MediaPlayer.create(this, R.raw.sound17);
    final MediaPlayer sound18 = MediaPlayer.create(this, R.raw.sound18);
    final MediaPlayer sound19 = MediaPlayer.create(this, R.raw.sound19);
    final MediaPlayer sound20 = MediaPlayer.create(this, R.raw.sound20);
    final MediaPlayer sound21 = MediaPlayer.create(this, R.raw.sound21);
    final MediaPlayer sound22 = MediaPlayer.create(this, R.raw.sound22);
    final MediaPlayer sound23 = MediaPlayer.create(this, R.raw.sound23);
    final MediaPlayer sound24 = MediaPlayer.create(this, R.raw.sound24);
    final MediaPlayer sound25 = MediaPlayer.create(this, R.raw.sound25);

    // play sound files on clicks
    Button s01 = (Button) findViewById(R.id.button01); 
    s01.setText(this.getString(R.string.quote01));
    s01.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            try {
                sound01.prepare();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            sound01.start();                
            }

    });
    registerForContextMenu(s01);

    Button s02 = (Button) findViewById(R.id.button02); 
    s02.setText(this.getString(R.string.quote02));
    s02.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            try {
                sound02.prepare();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            sound02.start();
        }
    });
    registerForContextMenu(s02);

    Button s03 = (Button) findViewById(R.id.button03); 
    s03.setText(this.getString(R.string.quote03));
    s03.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            try {
                sound03.prepare();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            sound03.start();
        }
    });
    registerForContextMenu(s03);

    Button s04 = (Button) findViewById(R.id.button04); 
    s04.setText(this.getString(R.string.quote04));
    s04.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            try {
                sound04.prepare();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            sound04.start();
        }
    });
    registerForContextMenu(s04);

    Button s05 = (Button) findViewById(R.id.button05); 
    s05.setText(this.getString(R.string.quote05));
    s05.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            try {
                sound05.prepare();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            sound05.start();
        }
    });
    registerForContextMenu(s05);

    Button s06 = (Button) findViewById(R.id.button06); 
    s06.setText(this.getString(R.string.quote06));
    s06.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            try {
                sound06.prepare();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            sound06.start();
        }
    });
    registerForContextMenu(s06);

Answer 1

使用對象成員變量來保留您當前正在播放的聲音，以便您可以調用stop()並且不要忘記對它進行空檢查。 離開活動后，不要忘記release() MediaPlayer對象。

以下可能是一個更好的設計：將所有音頻文件移動到資產目錄，並將文件名放在按鈕的標記中，使用相同的click事件處理程序獲取一個MediaPlayer對象的狀態，如果當前正在播放，則將其停止，設置新文件以從按鈕的標簽播放並播放文件。 這將大大減少您的重復代碼。

Answer 2

使用單個MediaPlayer實例。 您的設備將在大多數設備上失敗，因為無論如何它都會分配給許多MediaPlayer實例。 同樣，重復的代碼也是不好的。 壞壞：

public class NewBoard extends Activity {
    private MediaPlayer player;
    private Resources res;

    private int buttonIds = { R.id.button01, R.id.button02, R.id.button03,
                              R.id.button04, R.id.button05, R.id.button06,
                              R.id.button07, R.id.button08, R.id.button09,
                              R.id.button10, R.id.button11, R.id.button12,
                              R.id.button13, R.id.button14, R.id.button15,
                              R.id.button16, R.id.button16, R.id.button17,
                              R.id.button18, R.id.button19, R.id.button20,
                              R.id.button21, R.id.button22, R.id.button23,
                              R.id.button24, R.id.button25 };

    private int soundIds =  { R.raw.sound01, R.raw.sound02, R.raw.sound03,
                              R.raw.sound04, R.raw.sound05, R.raw.sound06,
                              R.raw.sound07, R.raw.sound08, R.raw.sound09,
                              R.raw.sound10, R.raw.sound11, R.raw.sound12,
                              R.raw.sound13, R.raw.sound14, R.raw.sound15,
                              R.raw.sound16, R.raw.sound16, R.raw.sound17,
                              R.raw.sound18, R.raw.sound19, R.raw.sound20,
                              R.raw.sound21, R.raw.sound22, R.raw.sound23,
                              R.raw.sound24, R.raw.sound25 };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);

        //Kill this with fire -- just an unnecessary user annoyance.
        Toast.makeText(this, 
            "Thank you for using this App.", Toast.LENGTH_LONG).show();

        AdView layout = (AdView)findViewById(R.id.adView);
        AdRequest adRequest = new AdRequest();
        adRequest.setTesting(true);
        layout.loadAd(adRequest);

        player = new MediaPlayer();
        res = getResources();

        for(int i = 0, n = buttonIds.length(); i < n; i++) {
            Button button = (Button)findViewById(buttonIds[i]);
            button.setOnClickListener(new SoundClickListener(soundIds[i]));
        }
    }

    private class SoundClickListener implements OnClickListener {
        private int id;

        public SoundClickListener(int soundId) {
            id = soundId;
        }

        public void onClick(View v) {
            player.reset();
            player.setDataSource(
                res.openRawResourceFd(id).getFileDescriptor());
            player.prepare();
            player.start();
        }
    }
}

這樣的事情。 可能會編譯，也可能不會編譯。 另外，正如所評論的那樣，用火殺死Toast -真令人討厭。