powercamera.java

手机游戏对战平台。自己做的一个东东。 支持多个手机联网打游戏；采用socket链接通信。 平台：J2ME&JAVA

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package mmapi;

import java.io.IOException;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.Manager;
import javax.microedition.media.MediaException;
import javax.microedition.media.Player;
import javax.microedition.media.control.VideoControl;

/**
 * @author XJX
 */
public class PowerCamera extends MIDlet implements CommandListener,Runnable{
    private boolean midletPaused = false;
    
    private Display display = null;
    private Displayable resume = null;
    private List main = null;
    private PowerModel pm = null;
    private Player player = null;
    private VideoControl vc = null;
    private Command exitCommand = new Command("退出",Command.EXIT, 1);
    private Command captureCommand = new Command("拍照",Command.OK, 1);
    private Command backCommand = new Command("返回",Command.BACK, 1);
    
//<editor-fold defaultstate="collapsed" desc=" Generated Fields ">//GEN-BEGIN:|fields|0|
//</editor-fold>//GEN-END:|fields|0|

    /**
     * The VisualMIDlet constructor.
     */
    public PowerCamera() {
    }

//<editor-fold defaultstate="collapsed" desc=" Generated Methods ">//GEN-BEGIN:|methods|0|
//</editor-fold>//GEN-END:|methods|0|

//<editor-fold defaultstate="collapsed" desc=" Generated Method: initialize ">//GEN-BEGIN:|0-initialize|0|0-preInitialize
/**
 * Initilizes the application.
 * It is called only once when the MIDlet is started. The method is called before the <code>startMIDlet</code> method.
 */
private void initialize () {//GEN-END:|0-initialize|0|0-preInitialize
        // write pre-initialize user code here
//GEN-LINE:|0-initialize|1|0-postInitialize
        // write post-initialize user code here
}//GEN-BEGIN:|0-initialize|2|
//</editor-fold>//GEN-END:|0-initialize|2|

//<editor-fold defaultstate="collapsed" desc=" Generated Method: startMIDlet ">//GEN-BEGIN:|3-startMIDlet|0|3-preAction
/**
 * Performs an action assigned to the Mobile Device - MIDlet Started point.
 */
public void startMIDlet () {//GEN-END:|3-startMIDlet|0|3-preAction
        // write pre-action user code here
//GEN-LINE:|3-startMIDlet|1|3-postAction
        // write post-action user code here
}//GEN-BEGIN:|3-startMIDlet|2|
//</editor-fold>//GEN-END:|3-startMIDlet|2|

//<editor-fold defaultstate="collapsed" desc=" Generated Method: resumeMIDlet ">//GEN-BEGIN:|4-resumeMIDlet|0|4-preAction
/**
 * Performs an action assigned to the Mobile Device - MIDlet Resumed point.
 */
public void resumeMIDlet () {//GEN-END:|4-resumeMIDlet|0|4-preAction
        // write pre-action user code here
//GEN-LINE:|4-resumeMIDlet|1|4-postAction
        // write post-action user code here
}//GEN-BEGIN:|4-resumeMIDlet|2|
//</editor-fold>//GEN-END:|4-resumeMIDlet|2|

//<editor-fold defaultstate="collapsed" desc=" Generated Method: switchDisplayable ">//GEN-BEGIN:|5-switchDisplayable|0|5-preSwitch
/**
 * Switches a current displayable in a display. The <code>display</code> instance is taken from <code>getDisplay</code> method. This method is used by all actions in the design for switching displayable.
 * @param alert the Alert which is temporarily set to the display; if <code>null</code>, then <code>nextDisplayable</code> is set immediately
 * @param nextDisplayable the Displayable to be set
 */
public void switchDisplayable (Alert alert, Displayable nextDisplayable) {//GEN-END:|5-switchDisplayable|0|5-preSwitch
        // write pre-switch user code here
Display display = getDisplay ();//GEN-BEGIN:|5-switchDisplayable|1|5-postSwitch
if (alert == null) {
display.setCurrent (nextDisplayable);
} else {
display.setCurrent (alert, nextDisplayable);
}//GEN-END:|5-switchDisplayable|1|5-postSwitch
        // write post-switch user code here
}//GEN-BEGIN:|5-switchDisplayable|2|
//</editor-fold>//GEN-END:|5-switchDisplayable|2|

    /**
     * Returns a display instance.
     * @return the display instance.
     */
    public Display getDisplay () {
        return Display.getDisplay(this);
    }

    /**
     * Exits MIDlet.
     */
    public void exitMIDlet() {
        switchDisplayable (null, null);
        destroyApp(true);
        notifyDestroyed();
    }
        public void capture(){
        try{
            //捕获数据 可以通过参数定制编码类型以及图片的长度和高度
            byte[] imgData = vc.getSnapshot("encoding=jpeg&width=160&height=120");
            ViewImageUI vimage = new ViewImageUI(this, imgData);
            //显示图片，并让用户输入标题
            display.setCurrent(vimage);
            player.close();
            player = null;
            vc = null;
        }catch(MediaException ex){
            showInfo(ex.toString(),AlertType.ERROR);
        }
    }
        //把播放器资源释放，系统可能需要使用
    private void releasePlayer(){
        if(player != null){
            player.close();
            player = null;
        }if(vc != null){
            vc = null;
        }
    }
    public void back(){
        display.setCurrent(main);
    }
     private void showCamera(){
        try{
            //创建播放器
            if(player == null){
                player = Manager.createPlayer("capture://video");
            }
            player.realize();
            //获得VideoControl
            vc = (VideoControl)player.getControl("VideoControl");
            //将捕获的数据绘制到Canvas上
            CameraCanvas cc = new CameraCanvas(this, vc);
            cc.addCommand(captureCommand);
            cc.addCommand(backCommand);
            cc.setCommandListener(this);
            display.setCurrent(cc);
            player.start();
        }catch(IOException ex){
            ex.printStackTrace();
            player =null;
            vc = null;
        } catch(MediaException ex){
            ex.printStackTrace();
            player =null;
            vc = null;
        }
    }
       public void savePicture(Picture pic){
        pm.savePicture(pic);
        showInfo("成功保存图片到我的相册", AlertType.CONFIRMATION);
    }
 //错误提示
    public void showInfo(String message,AlertType type){
        Alert alert = new Alert("系统提示");
        alert.setString(message);
        alert.setTimeout(2000);
        alert.setType(type);
        display.setCurrent(alert, main);
    }
        public void setCurent(Displayable current){
        display.setCurrent(current);
    }
    /**
     * Called when MIDlet is started.
     * Checks whether the MIDlet have been already started and initialize/starts or resumes the MIDlet.
     */
    public void startApp() {
        if (midletPaused) {
            resumeMIDlet ();
        } else {
            initialize ();
            startMIDlet ();
        }
        
        midletPaused = false;
         if(display == null){
            display = Display.getDisplay(this);
            pm = new PowerModel(this);
            main = new List("主菜单", List.IMPLICIT, new String[]{"手机拍照","我的相册"}, null);
            main.addCommand(exitCommand);
            main.setCommandListener(this);
            resume = main;
        }
        display.setCurrent(resume);
    }

    /**
     * Called when MIDlet is paused.
     */
    public void pauseApp() {
        midletPaused = true;
        resume = display.getCurrent();
    }

    /**
     * Called to signal the MIDlet to terminate.
     * @param unconditional if true, then the MIDlet has to be unconditionally terminated and all resources has to be released.
     */
    public void destroyApp(boolean unconditional) {
         //退出程序,释放资源
        pm.release();
        releasePlayer(); 
    }

    public void commandAction(Command cmd,Displayable displayable) {
           if(cmd == exitCommand){
            destroyApp(false);
            notifyDestroyed();
        }else if(cmd == List.SELECT_COMMAND){
            String label = main.getString(main.getSelectedIndex());
            if(label.equals("手机拍照")){
                //判断是否支持MMAPI
                String support = PowerModel.isVideoCapture();
                if(support.equals("true")){
                    showCamera();
                }else{
                    showInfo("您的手机不支持拍照功能",AlertType.WARNING);
                }
            }else if(label.equals("我的相册")){
                //一次读取Picture[]数组，这里对内存消耗很大
                Picture[] pic = pm.getAllPicture();
                if(pic == null){
                    showInfo("相册为空", AlertType.INFO);
                }else{
                    ImageList list = new ImageList(this);
                    list.initTitle(pic);
                    display.setCurrent(list);
                }
            }
        }else if(cmd == captureCommand){
            Thread t=new Thread(this);
            t.start();
        }else if(cmd == backCommand){
            releasePlayer();
            back();
        }
    }

    public void run() {
       capture();
    }

}