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我告诉他们我正在使用 MIDlet，我无法更改任何乐器的 midi 通道。我试过有无.shortMidiEvent(0xC0 + channel, program, 0);结果setProgram(channel, -1, program)。在我的手机上是诺基亚X3-02 仪器更改不起作用，只有midlet 的模拟器。这是代码片段

public final class Dmgcpu implements Runnable {
private Player player;
private static MIDIControl synth;

private void initSound() {
    try {

        player = Manager.createPlayer(Manager.MIDI_DEVICE_LOCATOR);
        player.prefetch();
        synth = (MIDIControl) player.getControl("javax.microedition.media.control.MIDIControl");
    } catch (Exception ex) {
    }

    synth.setProgram(0, -1, instSound_a);
    //synth.shortMidiEvent(0xC0, instSound_a, 0);

   //sound test
   synth.shortMidiEvent(0x90 + channel, note[i], volume * MASTER_VOLUME);

   thread_sleep(300);

   synth.shortMidiEvent(0x80 + channel, note[i], 0);

}

是你可以改变仪器，因为我知道你使用这样的player情况下的数组。我尝试并没有奏效。萨卢多斯

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1 回答 1

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媒体播放器对于 JavaME 来说总是很棘手。有些设备需要你 prefetch() ，而如果你这样做，其他设备会崩溃。有些人喜欢realize()，而另一些人则不喜欢。因此，最好将多个try/catch 块与prefetch() 和realize() 等一起使用。由于prefetch()，您的try 块可能会失败。所以试试这个：

public final class Dmgcpu implements Runnable {
private Player player = null;
private static MIDIControl synth = null;

private void initSound() {
  try {
    player = Manager.createPlayer(Manager.MIDI_DEVICE_LOCATOR);
  } catch (Exception e) {}
  try {
    player.realize();
  } catch (Exception e) {}
  try {
    player.prefetch();
  } catch (Exception e) {}
  try {
    synth = (MIDIControl) player.getControl("javax.microedition.media.control.MIDIControl");
  } catch (Exception ex) {}

    if (synth!=null) {
    synth.setProgram(0, -1, instSound_a);

    //synth.shortMidiEvent(0xC0, instSound_a, 0);

    //sound test
    synth.shortMidiEvent(0x90 + channel, note[i], volume * MASTER_VOLUME);

    thread_sleep(300);

    synth.shortMidiEvent(0x80 + channel, note[i], 0);
  }
}

有关媒体播放器的更多信息：http: //indiegamemusic.com/help.php ?id=1

于 2013-05-29T16:35:10.723 回答