Question

我有一个ImageView，我需要做的就是在应用加载时从互联网上显示图像。有一种非常简单的方法吗？

Answer 1

ImageView.setImageURI似乎不适用于互联网资源，因此您应该自己阅读位图。

InputStream is = new URL("http://example.com/myimage.jpg").openStream();
Bitmap bitmap = BitmapFactory.decodeStream(is);
is.close(); 
ImageView iv = (ImageView) findViewById(R.id.myImage);
iv.setImageBitmap(bitmap);

但是这会在UI线程上加载图像，这会导致打嗝。最好在不同的线程中进行，例如使用：

new AsyncTask<String, Void, Bitmap>() {
    protected Bitmap doInBackground(String... params) {
        try {
            return loadBitmap(params[0]);
        } catch (Exception e) {
            Log.e("imagetask", "error loading bitmap", e);
            return null;
        }
    }

    protected Bitmap loadBitmap(String urlSpec) throws IOException {
        InputStream is = new URL(urlSpec).openStream();
        try {
            return BitmapFactory.decodeStream(is);
        } finally {
            is.close();
        } 
    }

    protected void onPostExecute(Bitmap bitmap) {
        if (bitmap != null) {
            ImageView iv = (ImageView) findViewById(R.id.myImage);
            iv.setImageBitmap(bitmap);
        }
    }
}.execute("http://example.com/myimage.jpg");

Answer 2

HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet( url);

HttpResponse response = client.execute( get );
Bitmap bitmap = BitmapFactory.decodeStream( response.getEntity().getContent() );

Android - 如何从URL显示图像？

2 个答案: