Question

我尝试使用 Glide

从服务器下载多张图片

这是代码

   for (String url : list) {
        RequestOptions requestOptions = RequestOptions.diskCacheStrategyOf(DiskCacheStrategy.ALL);

        Glide.with(this)
                .asBitmap()
                .load(url).addListener(new RequestListener<Bitmap>() {
            @Override
            public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Bitmap> target, boolean isFirstResource) {
                return false;
            }

            @Override
            public boolean onResourceReady(Bitmap resource, Object model, Target<Bitmap> target, DataSource dataSource, boolean isFirstResource) {
                Log.e("ProgressCheck", "onResourceReady: " + progress);

                return false;
            }
        })
                .apply(requestOptions)
                .submit();
    }

代码运行正常，但是当下载映像失败（由于无线网络断开或服务器不响应等原因）时，如何再次发送相同的请求？

还是有更好的方法使用 Glide

下载多张图片

Answer 1

我建议您采取另一种通过滑行加载图像的方法。

这是伪代码

JSONObject params = new JSONObject();
        params.put("tag", "login");
        params.put("username", username);
        params.put("password", password);
        final String requestBody = params.toString();

        StringRequest request = new StringRequest(Request.Method.POST, ApiService.auth,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        hideDialog();
                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            boolean error = jsonObject.getBoolean("error");

                            // Check for error node in json
                            if (!error) {
                                // user successfully logged in
                                // Create login_view session
                                session.setLogin(true);

                                // Now store the user in SQLite
                                String uid = jsonObject.getString("uid");

                                JSONObject user = jsonObject.getJSONObject("user");
                                String username1 = user.getString("username");
                                String email = user.getString("email");
                                String city = user.getString("city");
                                String subdistrict = user.getString("subdistrict");
                                String name = user.getString("name");
                                String nickname = user.getString("nickname");
                                String address = user.getString("address");
                                String phone = user.getString("phone");
                                String birth_date = user.getString("birth_date");
                                String gender = user.getString("gender");
                                String created_at = user.getString("created_at");
                                String updated_at = user.getString("updated_at");
                                String weight = user.getString("weight");
                                String height = user.getString("height");
                                String prohibition = user.getString("prohibition");

                                Toast.makeText(Login.this, "Successfully logged in, congrats!", Toast.LENGTH_SHORT).show();

                                // Inserting row in users table
                                db.addUser(uid, username1, email, city, subdistrict, name, nickname, address, phone, birth_date, gender, created_at, updated_at);
                                db.updateMedicalInfo(weight, height, prohibition, updated_at);
                                // Launch main activity
                                Intent intent = new Intent(Login.this, Home.class);
                                startActivity(intent);
                                finish();
                            } else {
                                // Error in login_view. Get the error message
                                String errorMsg = jsonObject.getString("error_msg");
                                Toast.makeText(getApplicationContext(), errorMsg, Toast.LENGTH_LONG).show();
                            }
                        } catch (JSONException e) {
                            // JSON error
                            e.printStackTrace();
                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e("VOLLEY", error.toString());
                hideDialog();
            }
        }) {

            @Override
            protected Map<String, String> getParams() {
                // Posting parameters to login_view url
                Map<String, String> params = new HashMap<>();
                params.put("tag", "login");
                params.put("username", username);
                params.put("password", password);

                return params;
            }

            @Override
            public String getBodyContentType() {
                return "application/json; charset=utf-8";
            }

            @Override
            public byte[] getBody() throws AuthFailureError {
                try {
                    return requestBody == null ? null : requestBody.getBytes("utf-8");
                } catch (UnsupportedEncodingException uee) {
                    VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s", requestBody, "utf-8");
                    return null;
                }
            }
        };

Answer 2

如果error或fallback策略对您没有用，那么在4.3.0版本中，您可以在失败时启动新请求：

Glide.with(fragment)
  .load(url)
  .error(
      Glide.with(fragment)
        .load(url))
        .into(imageView);

在https://bumptech.github.io/glide/doc/options.html#starting-a-new-request-on-failure

了解更多信息

如果使用glide下载图像失败，如何再次请求

2 个答案: