我在從URL中拉取位圖時遇到了一些問題。我在Stack上使用了另一個問題的例子,但它不會加載圖像。下面是代碼:Android - 從URL添加到rootview的位圖
public class Image extends Activity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Bitmap bitmap = DownloadImage("http://cogadget.com/cogadget/wp-content/uploads/2010/05/Android-Logo-50x50.jpg");
ImageView img = (ImageView) findViewById(R.id.imageView1);
img.setImageBitmap(bitmap);
}
private InputStream OpenHttpConnection(String urlString) throws IOException {
InputStream in = null;
int response = -1;
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
if (!(conn instanceof HttpURLConnection))
throw new IOException("Not an HTTP connection");
try {
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.connect();
response = httpConn.getResponseCode();
if (response == HttpURLConnection.HTTP_OK) {
in = httpConn.getInputStream();
}
} catch (Exception ex) {
throw new IOException("Error connecting");
}
return in;
}
private Bitmap DownloadImage(String URL) {
Bitmap bitmap = null;
InputStream in = null;
try {
in = OpenHttpConnection(URL);
bitmap = BitmapFactory.decodeStream(in);
in.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
return bitmap;
}
}
我試圖來用URL位圖的ImageView的。我可以在我的模擬器上連接到互聯網,但在logcat中它告訴我它無法建立連接。我還在互聯網的清單中設置了權限。我被可能是一個簡單的修補程序的傻眼了。
@Quanturium的回答是一個開始。但是你真的應該發佈你的logcat來查看你遇到的問題。 – DigCamara 2013-03-16 01:43:13