java - 在android音板中，如何使一种声音在点击另一种声音后停止播放？

Question

如何修改此设置，以便如果一个声音已经在播放并且单击了另一个声音，则前一个声音停止播放并开始新选择的声音？提前感谢大家的帮助。 (这不是全部代码，只是最重要的)

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

使用对象成员变量来保存当前播放的声音，以便您可以调用 stop() 并且不要忘记对其进行空检查。离开 Activity 后，不要忘记 release() 您的 MediaPlayer 对象。

以下可能是更好的设计:将所有音频文件移动到资源目录并将文件名放在按钮的标签中，使用相同的单击事件处理程序来获取一个 MediaPlayer 对象的状态，如果它当前正在播放，从按钮的标签设置要播放的新文件并播放该文件。这将显着减少重复代码。