Question

我在服务器网址中有图像，然后我正在传递并显示到卡片中。我在android中使用LoaderImageView库并显示但是在Glass中我将url链接传递给了卡片。但是我得到了这个错误“CardBuilder类型中的方法addImage（Drawable）不适用于参数（String）”

代码：

 public static Drawable drawableFromUrl(String url)  {
        Bitmap x;


        try {
             HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
             connection.connect();
             InputStream input = connection.getInputStream();

             x = BitmapFactory.decodeStream(input);
             return new BitmapDrawable(x);

             } catch(MalformedURLException e) {
            //Do something with the exception.
        }

        catch(IOException ex) {
             ex.printStackTrace();
       }
        return null;

    }


    View view = new CardBuilder(getBaseContext(), CardBuilder.Layout.TITLE)
    .setText("TITLE Card")
    // .setIcon(R.drawable.ic_phone)
    .addImage(drawableFromUrl(link))
    .getView();

Answer 1

From the doc，addImage采用Drawable，int或Bitmap。它不需要String。

您可以使用AsyncTask或线程或任何您喜欢的内容下载图像并将其转换为Drawable。然后，您可以调用addImage。

例如：

// new DownloadImageTask().execute("your url...")

private class DownloadImageTask extends AsyncTask<String, Void, Drawable> {     
    protected Drawable doInBackground(String... urls) {
        String url = urls[0];
        return drawableFromUrl(url);
    }

    protected void onPostExecute(Drawable result) {
        // yourCardBuilder.addImage(link)
        // or start another activity and use the image there...
    }
}

public static Drawable drawableFromUrl(String url) throws IOException {
    Bitmap x;
    HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
    connection.connect();
    InputStream input = connection.getInputStream();
    x = BitmapFactory.decodeStream(input);
    return new BitmapDrawable(x);
}

我没有对代码进行测试，但希望您明白这一点。

另见：

修改

private Drawable drawableFromUrl(String url) { try { Bitmap bitmap; HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection(); connection.connect(); InputStream input = connection.getInputStream(); bitmap = BitmapFactory.decodeStream(input); return new BitmapDrawable(bitmap); } catch (IOException e) { return null; } } private class DownloadImageTask extends AsyncTask<String, Void, Drawable> { protected Drawable doInBackground(String... urls) { String url = urls[0]; return drawableFromUrl(url); } protected void onPostExecute(Drawable result) { stopSlider(); if(result != null) { mCardAdapter.setCards(createCard(getBaseContext(), result)); mCardAdapter.notifyDataSetChanged(); } } }

请参阅my GitHub repo上的完整示例。 SliderActivity可能对您有所帮助。

如何从网址显示图像

1 个答案: