本文介绍了从URL中黑莓显示图片的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我用下面的code至preVIEW从URL的图像。
I used following code to preview an image from an url.
Bitmap bannerImage=Bitmap.getBitmapResource("http://www.asianmirror.lk/english/images/stories/demo/hot_news/top_news/sanga1_latest.jpg");
BitmapField banner=new BitmapField(bannerImage);
add(banner);
但图像没有在UI preVIEW。是否有在黑莓的URL特殊的方式preVIEW图像。(我是指,要我把图像中的一个临时数组preVIEW形象?)谢谢
But the image doesn't preview in the UI. Is there is special way to preview images from a url in blackberry.(I means, shall I put the Image in to a temporary Array to preview the Image?) Thank you
推荐答案
试试这个 -
URLBitmapField wmf= new util.URLBitmapField("http://www.asianmirror.lk/english/images/stories/demo/hot_news/top_news/sanga1_latest.jpg")
add(wmf);
下面// URLBitmapField类给出 -
//URLBitmapField class is given below-
public class URLBitmapField extends BitmapField implements URLDataCallback {
EncodedImage result=null ;
public static Bitmap myImage;
public static EncodedImage _encoded_img=null ;
int _imgWidth = 140;
int _imgHeight = 140;
int _imgMargin = 10;
public URLBitmapField(String url) {
try {
http_image_data_extrator.getWebData(url, this);
}
catch (Exception e) {}
}
public Bitmap getBitmap() {
if (_encoded_img == null) return null;
return _encoded_img.getBitmap();
}
public void callback(final String data) {
if (data.startsWith("Exception")) return;
try {
byte[] dataArray = data.getBytes();
//bitmap = EncodedImage.createEncodedImage(dataArray, 0, dataArray.length);//no scale
_encoded_img = EncodedImage.createEncodedImage(dataArray, 0, dataArray.length); // with scale
_encoded_img = sizeImage(_encoded_img, _imgWidth, _imgHeight);
constants.image=_encoded_img;
//myImage=cropImage(_encoded_img.getBitmap());
setImage(_encoded_img);
UiApplication.getUiApplication().getActiveScreen().invalidate();
}
catch (final Exception e){}
}
public EncodedImage sizeImage(EncodedImage image, int width, int height) {
int currentWidthFixed32 = Fixed32.toFP(image.getWidth());
int currentHeightFixed32 = Fixed32.toFP(image.getHeight());
int requiredWidthFixed32 = Fixed32.toFP(width);
int requiredHeightFixed32 = Fixed32.toFP(height);
int scaleXFixed32 = Fixed32.div(currentWidthFixed32,
requiredWidthFixed32);
int scaleYFixed32 = Fixed32.div(currentHeightFixed32,
requiredHeightFixed32);
result = image.scaleImage32(scaleXFixed32, scaleYFixed32);
return result;
}
public class http_image_data_extrator {
static String url_="";
static StringBuffer rawResponse=null;
//static String result = null;
public static void getWebData(String url, final URLDataCallback callback) throws IOException {
//url_=url;
HttpConnection connection = null;
InputStream inputStream = null;
try {
if ((WLANInfo.getWLANState() == WLANInfo.WLAN_STATE_CONNECTED)
&& RadioInfo
.areWAFsSupported(RadioInfo.WAF_WLAN)) {
url += ";interface=wifi";
}
connection = (HttpConnection) Connector.open(url, Connector.READ, true);
String location=connection.getHeaderField("location");
if(location!=null){
if ((WLANInfo.getWLANState() == WLANInfo.WLAN_STATE_CONNECTED)
&& RadioInfo
.areWAFsSupported(RadioInfo.WAF_WLAN)) {
location += ";interface=wifi";
}
connection = (HttpConnection) Connector.open(location, Connector.READ, true);
}else{
connection = (HttpConnection) Connector.open(url, Connector.READ, true);
}
inputStream = connection.openInputStream();
byte[] responseData = new byte[10000];
int length = 0;
rawResponse = new StringBuffer();
while (-1 != (length = inputStream.read(responseData))) {
rawResponse.append(new String(responseData, 0, length));
}
int responseCode = connection.getResponseCode();
if (responseCode != HttpConnection.HTTP_OK){
throw new IOException("HTTP response code: "+ responseCode);
}
final String result = rawResponse.toString();
UiApplication.getUiApplication().invokeAndWait(new Runnable() {
public void run(){
callback.callback(result);
}
});
}
catch (final Exception ex) {
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
callback.callback("Exception (" + ex.getClass() + "): " + ex.getMessage());
}
});
}
}
}
public interface URLDataCallback {
public void callback(String data);
}
这篇关于从URL中黑莓显示图片的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!