capturecanvas.java

来自「Java ME手机应用开发大全一书的配套光盘上的源码」· Java 代码 · 共 43 行

package picturepuzzle;
import javax.microedition.lcdui.*;
public class CaptureCanvas extends Canvas implements CommandListener{
    
    private Command captureCommand;
    private GameMIDlet midlet;
    
    public CaptureCanvas(GameMIDlet midlet){
        this.midlet = midlet;
        captureCommand = new Command("Capture", Command.SCREEN, 1);
        addCommand(captureCommand);
        setCommandListener(this);
    }
    
    /**
     * 绘制黄色的背景色
     */
    public void paint(Graphics g) {
        g.setColor(0x00FFFF00); 
        g.fillRect(0, 0, getWidth(), getHeight());
    }
    
    /**
     * 单击"Capture"软键捕获图像的响应方法
     */
    public void commandAction(Command command , Displayable displayable) {
        if(command == captureCommand){
            //为了避免阻塞，启用新线程捕获图像
			new Thread() {
                public void run(){
                    midlet.takePhoto();
                }
            }.start();
        }
    }
    
    public void keyPressed(int keyCode) {
        int key = getGameAction(keyCode);
        if (key == Canvas.FIRE) {
            midlet.takePhoto();
        }
    }
}