英文:
Next Page Token is not functional and display only maximum (50) results
问题
displayVideos();
}
private void displayVideos ()
{
RequestQueue requestQueue= Volley.newRequestQueue(this);
StringRequest stringRequest=new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
System.out.println(jsonObject.get("nextPageToken"));
JSONArray jsonArray = jsonObject.getJSONArray("items");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject1 = jsonArray.getJSONObject(i);
if (jsonObject1.has("id")){
JSONObject jsonVideoId=jsonObject1.getJSONObject("id");
if (jsonVideoId.has("kind")){
if(jsonVideoId.getString("kind").equals("youtube#video")){
JSONObject jsonObjectSnippet = jsonObject1.getJSONObject("snippet");
JSONObject jsonObjectDefault=jsonObjectSnippet.getJSONObject("thumbnails").getJSONObject("medium");
String video_id=jsonVideoId.getString("videoId");
VideoDetails vd=new VideoDetails();
vd.setVideoId(video_id);
vd.setTitle(jsonObjectSnippet.getString("title"));
vd.setDescription(jsonObjectSnippet.getString("description"));
vd.setUrl(jsonObjectDefault.getString("url"));
videoDetailsoArrayList.add(vd);
}
// recyclerView.setAdapter(adapter);
// adapter.notifyDataSetChanged();
}
}
}
}catch (JSONException e) {
e.printStackTrace();
}
the url I am trying to parse is
String url="https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UCVMWWQ985A_-SESZUy_SsVQ&maxResults=50&pageToken="+nextPageToken+"&order=date&pageToken=CAUQAA&key=API_KEY";
I have been searching to apply nextpage token or page token in android studio but couldn't get a specific tutorial. There are many examples, but being naive in Android Studio, I can't implement it into my code.
<details>
<summary>英文:</summary>
I am trying to fetch all videos of a channel using youtube data api, but my code is giving error and doesn't respond to PAGE token
displayVideos();
}
private void displayVideos ()
{
RequestQueue requestQueue= Volley.newRequestQueue(this);
StringRequest stringRequest=new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
System.out.println(jsonObject.get("nextPageToken"));
JSONArray jsonArray = jsonObject.getJSONArray("items");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject1 = jsonArray.getJSONObject(i);
if (jsonObject1.has("id")){
JSONObject jsonVideoId=jsonObject1.getJSONObject("id");
if (jsonVideoId.has("kind")){
if(jsonVideoId.getString("kind").equals("youtube#video")){
JSONObject jsonObjectSnippet = jsonObject1.getJSONObject("snippet");
JSONObject jsonObjectDefault=jsonObjectSnippet.getJSONObject("thumbnails").getJSONObject("medium");
String video_id=jsonVideoId.getString("videoId");
VideoDetails vd=new VideoDetails();
vd.setVideoId(video_id);
vd.setTitle(jsonObjectSnippet.getString("title"));
vd.setDescription(jsonObjectSnippet.getString("description"));
vd.setUrl(jsonObjectDefault.getString("url"));
videoDetailsoArrayList.add(vd);
}
// recyclerView.setAdapter(adapter);
// adapter.notifyDataSetChanged();
}
}
}
}catch (JSONException e) {
e.printStackTrace();
}
the url I am trying to parse is
String url="https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UCVMWWQ985A_-SESZUy_SsVQ&maxResults=50&pageToken="+nextPageToken+"&order=date&pageToken=CAUQAA&key=API_KEY";
I have been searchingb to apply nextpage token or page token in android studio but couldnt get specific tutorial. there are many examples but being naive in android studio I cant implement it into my code.
</details>
# 答案1
**得分**: 1
请注意，您的URL中包含两个`pageToken`参数的实例：
```html
"https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UCVMWWQ985A_-SESZUy_SsVQ&maxResults=50&pageToken=" + nextPageToken + "&order=date&pageToken=CAUQAA&key=API_KEY"
它应该只有一个实例才能正常工作；更精确地说，您的URL应该只包含这个实例：pageToken=" + nextPageToken + "。
另一方面，您上面的代码没有显示实现分页的循环部分。也就是说，您没有展示出实际上为变量nextPageToken赋有效值的代码片段。
因此，我无法确定您的程序是否能正常工作。
分页循环应该如下所示：
// 最初没有pageToken
nextPageToken = null;
// URL如上所示，不包含pageToken参数
url = ...
do {
调用API并使用URL：url + (nextPageToken != null ? "&pageToken=" + nextPageToken : "")
nextPageToken = jsonObject.get("nextPageToken");
} while (nextPageToken != null)
英文:
Please note that your URL does contain two instances of the parameter pageToken:
"https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UCVMWWQ985A_-SESZUy_SsVQ&maxResults=50&pageToken="+nextPageToken+"&order=date&pageToken=CAUQAA&key=API_KEY".
It should have only one for that to work OK; to be more precise, your URL should contain only this instance: pageToken="+nextPageToken+".
On the other hand, your code above does not show the loop implementing pagination. That is that you haven't shown the piece of code where you actually assign a valid value to the variable nextPageToken.
Therefore I cannot tell if your program will work or not.
The pagination loop would look like this:
// initially no pageToken
nextPageToken = null;
// URL as above, without the parameter pageToken
url = ...
do {
invoke the API on the URL: url + (nextPageToken != null ? "&pageToken=" + nextPageToken : "")
nextPageToken = jsonObject.get("nextPageToken");
} while (nextPageToken != null)
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论