tonetest.java

来自「jBuilderX无线应用开发源代码」· Java 代码 · 共 49 行

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

public class ToneTest extends MIDlet implements CommandListener {
    
    private TextBox   tb;
	private final static Command exit = new Command("Exit", Command.EXIT, 1);
    private final static Command play = new Command("Play", Command.ITEM, 1);
    private Display   display;
	
	public ToneTest(){
		tb = new TextBox("Tone", "60", 3, TextField.NUMERIC);
		tb.addCommand(play);
		tb.addCommand(exit);
		tb.setCommandListener(this);
	}

    public void startApp() {
		display  = Display.getDisplay(this);
		display.setCurrent(tb);
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional){
    }

    public void commandAction(Command c, Displayable s){
		if(c == exit){
			destroyApp(false);
			notifyDestroyed();
		}
		else if (c == play){
			//获得用户输入的曲调数值，将其转化为整数，并保证其在0到127之间
			String str=tb.getString();
	 		int i=Integer.parseInt(str);
	 		if(i<0)i=0;
	  		if(i>127)i=127;
	 		try {
				//播放用户输入的曲调数值，以最大音量播放，播放时间为1秒
    	 		Manager.playTone(i, 1000, 100);
	 		} 
	 		catch (MediaException e) { }
		}
	}
}