如何下载图像并将其放入 Android 的视图中

Question

I use an API (...) I receive an url that contain a png, and I have trouble to show the picture.

I have to download the picture, and to show it. I put a gesture to request an other picture, so I have to delete the older picture when the user ask the newest one (when he make the gesture on the picture)

So, I've a method that download and show the picture (but the screen still black... ):

    private void downloadImage() {
    Bitmap bitmap = null;
    try {
        URL urlImage = new URL("http://www.google.fr/intl/en_com/images/srpr/logo1w.png");
        HttpURLConnection connection = (HttpURLConnection) urlImage.openConnection();
        InputStream inputStream = connection.getInputStream();
        bitmap = BitmapFactory.decodeStream(inputStream);
        Log.v("", "is showed");
        image.setImageBitmap(bitmap);
        Log.v("", "isn't");
        } 
    catch (MalformedURLException e) {
        e.printStackTrace();
        } 
    catch (IOException e) {
        e.printStackTrace();}
    }

in the onLoad, I've put

setContentView(R.layout.secondtab);

image = (ImageView)findViewById(R.id.ivImage);

and I'va declared the ImageView image before @Override.

In the xml, it's like that:

<?xml version="1.0" encoding="utf-8"?>

<android.gesture.GestureOverlayView
    android:id="@+id/gestures" android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:layout_weight="1.0"
    android:eventsInterceptionEnabled="true" android:gestureStrokeType="single" 
    android:gestureColor="#00FFFFFF"/>

<ImageView 
android:id="@+id/ivImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scrollbars="vertical"
/>

Thank you for the help:-)

Answer 1

Maybe try image.postInvalidate() ? Or just invalidate it if you are running all of this on the UI thread.

Answer 2

My error was that there was twice the same line:

setContentView(R.layout.secondtab);

now it's running, I just have to resize it!

Thanks to StackOverFlow!