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我正在使用TimerTask和ImageLoader類將n圖像加載到圖像項目。如何在J2ME中加載圖像？
public class Imageloader implements Runnable{
private ImageItem item=null;
private String url=null;
/*
* initializes the imageItem
*/
public Imageloader(ImageItem item,String url){
this.item=item;
this.url=url;
}
private Image getImage(String url) throws IOException {
item.setLabel(item.getLabel()+12);
System.out.println("Test 5");
HttpConnection connection = null;
DataInputStream inp = null;
int length;
byte[] data;
try {System.out.println("Test 6");
connection = (HttpConnection) Connector.open(url);
item.setLabel(item.getLabel()+13);
connection.getResponseMessage();
System.out.println("Test 7");
length = (int) connection.getLength();
item.setLabel(item.getLabel()+14);
System.out.println("Length is "+length);
System.out.println("Test 8");
data = new byte[length];
inp = new DataInputStream(connection.openInputStream());
item.setLabel(item.getLabel()+15);
System.out.println("Test 9");
inp.readFully(data);
item.setLabel(item.getLabel()+16);
System.out.println("Test 10");
return Image.createImage(data, 0, data.length);
}
finally {
if (connection != null) connection.close();
if (inp != null)inp.close();
}
}
public void run() {
System.out.println("Test 1");
Image image=null;
try{
if (url!=null){
System.out.println("Test 2");
image=getImage(url);
System.out.println("Test 3");
item.setImage(image);
item.setLabel(item.getLabel()+17);
System.out.println("Test 4");
}
else{
item.setAltText("Map address specified is incorrect");
}
}
catch(IOException e){
item.setAltText("Map cannot be loaded now");
}
}
}
public class MapTimer extends TimerTask{
DatagramConnection connection=null;
String message=null;
Imageloader imageretriever;
ImageItem item=null;
MapTimer (DatagramConnection connection,String message,ImageItem Img_map){
this.connection=connection;
this.message=message;
this.item=Img_map;
item.setLabel(item.getLabel()+1);
System.out.println("Map is initizlized...");
}
public void run() {
System.out.println("Map starting...");
item.setLabel(item.getLabel()+2);
String serverquery=null;
try {
item.setLabel(item.getLabel()+3);
sendMessage(message);
item.setLabel(item.getLabel()+4);
//serverquery=receiveMessage() ;
item.setLabel(item.getLabel()+5);
//item.setLabel(" Loading....");
//formatmessage(serverquery);
String url="http://maps.google.com/maps/api/staticmap?center=Brooklyn+Bridge,New+York,NY&zoom=14&size=512x512&maptype=roadmap"+
"&markers=color:blue|label:S|40.702147,-74.015794&markers=color:green|label:G|40.711614,-74."+
"&markers=color:red|color:red|label:C|40.718217,-73.998284&sensor=false";
Imageloader Im=new Imageloader(item,url);
item.setLabel(item.getLabel()+6);
(new Thread(Im)).start();
item.setLabel(item.getLabel()+7);
System.out.println("server map query is::: "+serverquery);
} catch (IOException ex) {
System.out.println("Error2"+ex);
}
catch(Exception e){
System.out.println("Error3"+e);
}
}
/*
* Sends a message via UDP to server
*/
private void sendMessage(String message) throws IOException{
Datagram packet_send=null;
if (connection != null){
byte[] packetsenddata=message.getBytes();
packet_send = connection.newDatagram(packetsenddata,packetsenddata.length);
connection.send(packet_send);
packet_send = null;
}
}
}
這是我如何設置計時器;
MapTimer maptimer=new MapTimer (connection,mapquery ,Img_map);
Timer timer=new Timer();
timer.schedule(maptimer, 5000, 100000);
它的正常工作與enulator但我對我的暴徒部署，圖像不中.. 圖像標籤是有點像Stopping 234567234567這意味着我的定時器運行良好。它沒有進入ImageLoader類...如何加載這個圖像？