package zieckey.j2me.study.mmapi;

public class AppRuntimeDetect
{
    public static boolean CAPTURE_PHOTO = false;
    public static boolean CAPTURE_VIDEO = false;
    public static boolean CAPTURE_AUDIO = false;
    public static boolean IS_MIDP2 = false;
    
    static
    {
        //判断是否支持录音

        CAPTURE_AUDIO = "true".equals( System.getProperty( "supports.audio.capture" ) ) ? true : false;
        //判断是否支持录像

        CAPTURE_VIDEO = "true".equals( System.getProperty( "supports.video.capture" ) ) ? true : false;
        
        //判断MIDP版本

        String platform = System.getProperty( "microedition.profiles" );
        if ( -1 != platform.indexOf("MIDP-2.0" ) )
        {
            IS_MIDP2 = true;
        }
        
        //判断是否支持拍照

        String snapshot = System.getProperty( "video.snapshot.encodings" );
        if ( snapshot != null )
        {
            CAPTURE_PHOTO = true;
        }
    }
}


package zieckey.j2me.study.mmapi;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.List;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

/**
 * 本程序用来说明获得当前硬件设备的媒体处理能力集的方法
 * @author zieckey
 */
public class ConfigMIDlet extends MIDlet implements CommandListener
{

    private Display    display;
    private Command    cmdExit;
    private List    menu;

    public ConfigMIDlet( )
    {
        display = Display.getDisplay( this );// 提取系统设备的Display对象

        cmdExit = new Command( "Exit", Command.SCREEN, 2 );// 对该菜单的相应应用到当前整个屏幕

    }

    protected void startApp() throws MIDletStateChangeException
    {

        // 构造一List组件，用于显示文本

        menu = new List( "Main", List.IMPLICIT );

        if ( AppRuntimeDetect.CAPTURE_AUDIO )
        {
            menu.append( "Capture audio", null );
        }
        if ( AppRuntimeDetect.CAPTURE_VIDEO )
        {
            menu.append( "Capture video", null );
        }
        if ( AppRuntimeDetect.IS_MIDP2 )
        {
            menu.append( "Is MIDP 2.0", null );
        }
        if ( AppRuntimeDetect.CAPTURE_PHOTO )
        {
            menu.append( "Capture photo", null );
        }
        
        menu.addCommand( cmdExit );
        menu.setCommandListener( (CommandListener)this );

        // 将menu设置为当前显示的组件

        display.setCurrent( menu );
    }

    protected void destroyApp( boolean arg0 ) throws MIDletStateChangeException
    {
    }

    protected void pauseApp()
    {
    }

    public void commandAction( Command cmd, Displayable arg1 )
    {
        // 对该命令的响应

        if ( cmd == cmdExit )
        {
            try
            {
                destroyApp( true );
            } catch ( MIDletStateChangeException e )
            {
                e.printStackTrace( );
            }
            notifyDestroyed( );
        }
    }
}