从远程装载PNG图片实例 |
| 作者：j2medev 来源：j2medev 发布时间：2006-7-25 8:55:42 |
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import java.io.*; import javax.microedition.io.*; import javax.microedition.lcdui.*; import javax.microedition.midlet.*; public class ImageLoader extends MIDlet implements CommandListener, Runnable { private Display mDisplay; private Form mForm; public ImageLoader() { mForm = new Form("Connecting..."); mForm.addCommand(new Command("Exit", Command.EXIT, 0)); mForm.setCommandListener(this); } public void startApp() { if (mDisplay == null) mDisplay = Display.getDisplay(this); mDisplay.setCurrent(mForm); // Do network loading in a separate thread. Thread t = new Thread(this); t.start(); } public void pauseApp() {} public void destroyApp(boolean unconditional) {} public void commandAction(Command c, Displayable s) { if (c.getCommandType() == Command.EXIT) notifyDestroyed(); } public void run() { HttpConnection hc = null; DataInputStream in = null; try { String url = getAppProperty("ImageLoader-URL"); hc = (HttpConnection)Connector.open(url); int length = (int)hc.getLength(); byte[] data = null; if (length != -1) { data = new byte[length]; in = new DataInputStream(hc.openInputStream()); in.readFully(data); } else { // If content length is not given, read in chunks. int chunkSize = 512; int index = 0; int readLength = 0; in = new DataInputStream(hc.openInputStream()); data = new byte[chunkSize]; do { if (data.length < index + chunkSize) { byte[] newData = new byte[index + chunkSize]; System.arraycopy(data, 0, newData, 0, data.length); data = newData; } readLength = in.read(data, index, chunkSize); index += readLength; } while (readLength == chunkSize); length = index; } Image image = Image.createImage(data, 0, length); ImageItem imageItem = new ImageItem(null, image, 0, null); mForm.append(imageItem); mForm.setTitle("Done."); } catch (IOException ioe) { StringItem stringItem = new StringItem(null, ioe.toString()); mForm.append(stringItem); mForm.setTitle("Done."); } finally { try { if (in != null) in.close(); if (hc != null) hc.close(); } catch (IOException ioe) {} } } } |
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