detectmma.java

《j2me开发精解〉（詹健飞）CD-rom附带源码。用netbeans

package com.j2medev.ch8.mmapi;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.Manager;

public class DetectMMA extends MIDlet implements CommandListener {
    
    private Display display = null;
    private Form form = null;
    public static final Command exitCommand = new Command("退出",Command.EXIT, 1);
    
    public void startApp() {
        if(display == null){
            display = Display.getDisplay(this);
            form = new Form("MMAPI特性");
            form.addCommand(exitCommand);
            form.setCommandListener(this);
            //判断系统是否支持MMAPI，可能版本为1.1或者1.0
            String version = System.getProperty("microedition.media.version");
            if(version != null){
                //支持MMAPI
                form.append("MMAPI版本："+version+"\n");
                //支持协议列表
                String[] sp_protocal = Manager.getSupportedProtocols(null);
                form.append("支持协议"+"\n");
                for(int i = 0;i<sp_protocal.length;i++){
                    form.append(sp_protocal[i]+"\n");
                }
                //支持媒体格式列表
                String[] sp_type = Manager.getSupportedContentTypes(null);
                form.append("支持媒体类型"+"\n");
                for(int j = 0;j<sp_type.length;j++){
                    form.append(sp_type[j]+"\n");
                }
                //拍照格式
                form.append("支持拍照格式"+"\n");
                form.append(System.getProperty("video.snapshot.encodings")+"\n");
                //是否支持混音
                form.append("支持混音："+(System.getProperty("supports.mixing").equals("true")?"是":"否")+"\n");
                form.append("音频捕获："+(System.getProperty("supports.audio.capture").equals("true")?"是":"否")+"\n");
                form.append("视频捕获："+(System.getProperty("supports.video.capture").equals("true")?"是":"否")+"\n");
                form.append("支持记录："+(System.getProperty("supports.recording").equals("true")?"是":"否")+"\n");
                //音频和视频编码格式
                form.append("音频编码："+System.getProperty("audio.encodings")+"\n");
                form.append("视频编码："+System.getProperty("video.encodings")+"\n");
            }else{
                form.append("不支持MMAPI");
            }
            display.setCurrent(form);
        }
        display.setCurrent(form);
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
    }
    
    public void commandAction(Command cmd,Displayable displayable){
        //退出应用程序
        if(cmd == exitCommand){
            destroyApp(false);
            notifyDestroyed();
        }
    }
}