simple_audio_midlet.java

《J2ME无线移动游戏开发》一书的配套光盘

package ch11;

import java.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.*;
import javax.microedition.midlet.*;

public class Simple_Audio_MIDlet
    extends MIDlet
    implements CommandListener {
  private Display mDisplay;
  private Form mMainForm;
  private Command mPlayCommand;

  public Simple_Audio_MIDlet() {
    mMainForm = new Form("一个简单播放器");

    mPlayCommand = new Command("播放", Command.SCREEN, 0);
    mMainForm.addCommand(mPlayCommand);
    mMainForm.addCommand(new Command("退出", Command.EXIT, 0));
    mMainForm.setCommandListener(this);

    mDisplay = Display.getDisplay(this);
  }

  public void startApp() {
    mDisplay.setCurrent(mMainForm);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {}

  // CommandListener method

  public void commandAction(Command c, Displayable s) {
    if (c.getCommandType() == Command.EXIT) {
      notifyDestroyed();
    }
    else if (c == mPlayCommand) {
      try {
        InputStream in = getClass().getResourceAsStream("/res/test.wav");
        Player p = Manager.createPlayer(in, "audio/x-wav");
        p.start();
      }
      catch (Throwable t) {
        Alert a = new Alert("警告：", t.toString(),
                            null, AlertType.ERROR);
        mDisplay.setCurrent(a, mMainForm);
      }
    }
  }
}