Android 下載圖片

URL fileURL = null;
Bitmap bitmap = null;
try {
fileURL = new URL(picUrl);
} catch (MalformedURLException err) {
err.printStackTrace();
}
try {
HttpURLConnection conn = (HttpURLConnection) fileURL
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
int length = (int) conn.getContentLength();
if (length != -1) {
byte[] imgData = new byte[length];
byte[] buffer = new byte[512];
int readLen = 0;
int destPos = 0;
while ((readLen = is.read(buffer)) > 0) {
System.arraycopy(buffer, 0, imgData, destPos, readLen);
destPos += readLen;
}
bitmap = BitmapFactory.decodeByteArray(imgData, 0,
imgData.length);
}
} catch (IOException e) {
e.printStackTrace();
}
holder.iv.setImageBitmap(bitmap);