我使用以下代码从手机或SDCard中检索图像,然后将该图像用于我的ListField。它提供输出,但生成屏幕需要很长时间。如何解决这个问题呢 ??谁能帮我??在此先感谢!!!
String text = fileholder.getFileName();
try{
String path="file:///"+fileholder.getPath()+text;
//path=”file:///SDCard/BlackBerry/pictures/image.bmp”
InputStream inputStream = null;
//Get File Connection
FileConnection fileConnection = (FileConnection) Connector.open(path);
inputStream = fileConnection.openInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int j = 0;
while((j=inputStream.read()) != -1) {
baos.write(j);
}
byte data[] = baos.toByteArray();
inputStream.close();
fileConnection.close();
//Encode and Resize image
EncodedImage eImage = EncodedImage.createEncodedImage(data,0,data.length);
int scaleFactorX = Fixed32.div(Fixed32.toFP(eImage.getWidth()),
Fixed32.toFP(180));
int scaleFactorY = Fixed32.div(Fixed32.toFP(eImage.getHeight()),
Fixed32.toFP(180));
eImage=eImage.scaleImage32(scaleFactorX, scaleFactorY);
Bitmap bitmapImage = eImage.getBitmap();
graphics.drawBitmap(0, y+1, 40, 40,bitmapImage, 0, 0);
graphics.drawText(text, 25, y,0,width);
}
catch(Exception e){}
答案 0 :(得分:6)
你应该读一次文件(在App开始时或在屏幕打开之前,可能会在那里放一个进度对话框),将图像放在数组中并在绘画中使用这个数组。