J2ME 键盘没有响应急求（在线等）
远程控制网络摄像头按键之后没有反映，苦恼中
public class GetCanvas extends GameCanvas implements Runnable {
protected Get get;
protected Thread thread;
protected int sign, sign1;
private Graphics graphics;
Image im;
Image t;
public Form fmViewPng;
private boolean sleeping;
private Display display;
public GetCanvas(){
super(false);
fmViewPng=new Form( " ");
}
public void start() {
sleeping = false;
thread=new Thread(this);
//input();
thread.start();
}
public void stop(){
sleeping = true;
}
public void run(){
Graphics g = getGraphics();
while (!sleeping){
input();
/* try{
System.out.println( "Connect server error ");
String url = "http://193.60.171.10/cgi-bin/camctrl.cgi?move=left ";
HttpConnection connection =(HttpConnection)Connector.open(url);
InputStream iStrm = connection.openInputStream();
}catch (IOException ioe) {}*/
// keyPressed(4);
try{
Image im;
if((im=getImage())!=null){
ImageItem ii=new ImageItem(null,im,ImageItem.LAYOUT_DEFAULT,null);
if(fmViewPng.size()!=0)
fmViewPng.set(0,ii);
else
fmViewPng.append(ii);
// input();
}
else{
fmViewPng.append( "Unsuccessful download. ");
}
}
catch(Exception e){
System.err.println( "Msg: "+e.toString());
}//input();
// Display.getDisplay(get).setCurrent(fmViewPng);
// display.setCurrent(fmViewPng);
try {
Thread.sleep(20);
} catch (Exception e) {}
}
flushGraphics();
}
private void input(){
int keyState = getKeyStates();
// System.out.println( "Connect server error ");
if((keyState & LEFT_PRESSED) != 0){
try{
System.out.println( "Connect server error ");
String url = "http://193.60.171.10/cgi-bin/camctrl.cgi?move=left ";
HttpConnection connection =(HttpConnection)Connector.open(url);
InputStream iStrm = connection.openInputStream();
}catch (IOException ioe) {}
} else if ((keyState & RIGHT_PRESSED) != 0){
try{
String url = "http://193.60.171.10/cgi-bin/camctrl.cgi?move=right ";
HttpConnection connection =(HttpConnection)Connector.open(url);
InputStream iStrm = connection.openDataInputStream();
}catch (IOException ioe) {}
}else if((keyState & UP_PRESSED) != 0){
try{
String url = "http://193.60.171.10/cgi-bin/camctrl.cgi?move=up ";
HttpConnection connection =(HttpConnection)Connector.open(url);
InputStream iStrm = connection.openInputStream();
}catch (IOException ioe) {}
}else if((keyState & DOWN_PRESSED) != 0){
try{
String url = "http://193.60.171.10/cgi-bin/camctrl.cgi?move=down ";
HttpConnection connection =(HttpConnection)Connector.open(url);
InputStream iStrm = connection.openInputStream();
}catch (IOException ioe) {}
}
}
private Image getImage() throws IOException{
String url= "http://193.60.171.10/cgi-bin/video.jpg ";
HttpConnection connection=(HttpConnection)Connector.open(url);
InputStream iStrm=connection.openDataInputStream();
Image im=null;
try{
byte imageData[];
int length=(int)connection.getLength();
if(length!=-1){
imageData=new byte[length];
iStrm.read(imageData);
}
else{
ByteArrayOutputStream bStrm=new ByteArrayOutputStream();
int ch;
while((ch=iStrm.read())!=-1){
bStrm.write(ch);
}
imageData=bStrm.toByteArray();
bStrm.close();
}
im=Image.createImage(imageData,0,imageData.length);
}
finally{
if(iStrm!=null)
iStrm.close();
if(connection!=null)
connection.close();
}
return(im==null? null:im);
}
}
PS：http://193.60.171.10/cgi-bin/camctrl.cgi?move=down
http://193.60.171.10/cgi-bin/camctrl.cgi?move=left
是控制远程摄像头的转向
[解决办法]
upppppppppppppppp
[解决办法]
这个我估计你的程序在按键之后就死锁了,所以没有响应
[解决办法]
最好获取摄像头图片的部分放在另外一个线程里，不然阻塞的话，很难响应按键
