如何从 webService，Android 创建图像

Question

所以，我有一个连接到 WebService 的应用程序，并且我已经从那里检索数据，现在我想检索一个图像链接并让 imageView 通过该链接获取该图像。这甚至可能吗？感谢任何帮助：D

        @Override
    protected Void doInBackground(Void... params) {
        HttpHandler sh = new HttpHandler();

        String jsonStr = sh.makeServiceCall(url);
        Log.e(TAG, "Response from URL: " + jsonStr);

        if (jsonStr != null) {
            try {

                JSONArray array = new JSONArray(jsonStr);
                for (int i = 0; i < array.length(); i++) {

                    JSONObject jsonObject = array.getJSONObject(i);

                    JSONArray paises = jsonObject.optJSONArray("paises");

                    if (paises != null) {
                        for (int j = 0; j < paises.length(); j++) {
                            JSONObject jsonObject1 = paises.getJSONObject(j);
                            System.out.println(jsonObject1.optString("Designacao"));
                            String K_PAIS = jsonObject1.getString("K_PAIS");
                            String Designacao = jsonObject1.getString("Designacao");
                            String URL_IMAGE_SMALL = jsonObject1.getString("URL_IMAGE_SMALL");
                            String URL_IMAGEM = "http://something.something.pt" + URL_IMAGE_SMALL;

                            new DownloadImage(imageView6).execute(URL_IMAGEM);

                            HashMap<String, String> pais = new HashMap<>();

                            pais.put("K_PAIS", K_PAIS);
                            pais.put("Designacao", Designacao);
                            pais.put("URL_IMAGE_SMALL", URL_IMAGE_SMALL);
                            pais.put("URL_IMAGEM", URL_IMAGEM);
                            listaPaises.add(pais);


                        }
                    }
                    System.out.println(jsonObject.optString("Designacao"));
                }



            } catch (final JSONException e) {
                Log.e(TAG, "Json parsing error: " + e.getMessage());
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(), "Json parsin error: " + e.getMessage(), Toast.LENGTH_LONG).show();
                    }
                });
            }
        } else {
            Log.e(TAG, "Couldn't get json from server.");
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(getApplicationContext(), "Couldn't get json from server. Check LogCat for possible errpr!", Toast.LENGTH_LONG).show();
                }
            });
        }
        return null;



    }
{...}
public class DownloadImage extends AsyncTask<String, Void, Bitmap> {
    ImageView bmImage;

    public DownloadImage(ImageView bmImage) {
        this.bmImage = (ImageView) bmImage;
    }

    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap mIcon11 = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            mIcon11 = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.d("Error", e.getStackTrace().toString());

        }
        return mIcon11;
    }

    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(result);
    }
}

Answer 1

你可以使用Picasso，一个很棒的图片库。

例子：

Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);

通过 Gradle 添加依赖：

compile 'com.squareup.picasso:picasso:2.5.2'

Answer 2

您可以使用任何第三方库 示例使用Glide 库

这个库将帮助您从url 获取和显示ImageView 上的图像。

示例：

Glide.with(context).load(image_url).into(your_image_view);

这是该库的链接：https://github.com/bumptech/glide

Answer 3

您必须像往常一样在 XML 中设置 ImageView。然后，您可以使用任何第三方库，例如 Picasso 或 Glide，它们将从 url 加载图像并将其设置到您的活动/片段中的 ImageView。

Answer 4

在你的应用 build.gradle 添加

compile 'com.github.bumptech.glide:glide:3.7.0'

使用此代码从 url 加载图像

 Glide.with(getApplicationContext()).load("image_url").into(ImageView);

Answer 5

如果您不想使用第三方库，请尝试此操作

 new DownloadImage(imamgeview).execute(url);

创建异步任务

 public class DownloadImage extends AsyncTask<String, Void, Bitmap> {
    CircleImageView bmImage;

    public DownloadImage(ImageView bmImage) {
        this.bmImage = (CircleImageView) bmImage;
    }

    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap mIcon11 = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            mIcon11 = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.d("Error", e.getStackTrace().toString());

        }
        return mIcon11;
    }

    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(result);
    }
}

我希望它适用于你的情况

Answer 6

第 1 步：创建名为 DownloadImage 的类

public class DownloadImage extends AsyncTask<String, Void, Bitmap> {
    CircleImageView bmImage;

    public DownloadImage(ImageView bmImage) {
        this.bmImage = (CircleImageView) bmImage;
    }

    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap mIcon11 = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            mIcon11 = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.d("Error", e.getStackTrace().toString());

        }
        return mIcon11;
    }

    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(result);
    }
}

第 2 步： 执行 AsyncTask

new DownloadImage(imgUserProfile).execute(userProfileUrl);

**像这样的Json Url：** https://graph.facebook.com/1220130444748799/picture?height=400&width=400&migration_overrides=%7Boctober_2012%3Atrue%7D