我刚开始学习android，因此现在我的目标是使用具有多种功能的Youtube API创建应用，但是其中一项功能（例如搜索视频并在屏幕上列出它们）无法正常工作，并且没有任何功能错误，但是当我按搜索按钮时，什么也没发生。这是主类的代码
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.Toast;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.app.youtubedownloader.Adapter.MyAdapter;
import com.app.youtubedownloader.Model.VideoDetails;
import com.google.android.youtube.player.YouTubeBaseActivity;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
String API_KEY = "here is my api key";
ListView listView;
ArrayList<VideoDetails> videoDetailsArrayList;
MyAdapter myadapter;
String url = "https://www.googleapis.com/youtube/v3/search?";
String part = "snippet";
ImageButton searchbtn;
EditText searchfield;
String keySearch;
Integer maxResults = 10;
String order = "title";
@Override
protected void onCreate(Bundle savedInstanceState) {
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = findViewById(R.id.listvideos);
videoDetailsArrayList = new ArrayList<>();
myadapter = new MyAdapter(MainActivity.this, videoDetailsArrayList);
searchfield = findViewById(R.id.searchfield);
searchbtn = findViewById(R.id.searchbtn);
searchbtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
keySearch = searchfield.getText().toString();
displayVideos();
}
});
}
public void displayVideos(){
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
url = "https://www.googleapis.com/youtube/v3/search?" + "part=" + part + "&q=" + keySearch + "&maxResults=3" + "&order=" + order + "&key=" + API_KEY;
StringRequest stringRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try{
JSONObject jsonObject = new JSONObject(response);
JSONArray jsonArray = jsonObject.getJSONArray("items");
for(int i=0; i<jsonArray.length(); i++){
JSONObject jsonObject1 = jsonArray.getJSONObject(i);
JSONObject jsonVideoId = jsonObject1.getJSONObject("id");
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"));
videoDetailsArrayList.add(vd);
}
listView.setAdapter(myadapter);
myadapter.notifyDataSetChanged();
} catch(JSONException e){
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(),error.getMessage(),Toast.LENGTH_LONG).show();
}
});
requestQueue.add(stringRequest);
}
}
这是针对适配器类的
import android.app.Activity;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.app.youtubedownloader.Model.VideoDetails;
import com.app.youtubedownloader.R;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
public class MyAdapter extends BaseAdapter {
public Activity activity;
public ArrayList<VideoDetails> videoDetailsArrayList;
public LayoutInflater inflater;
public MyAdapter(Activity activity, ArrayList<VideoDetails> videoDetailsArrayList){
this.activity = activity;
this.videoDetailsArrayList = videoDetailsArrayList;
}
@Override
public Object getItem(int position) {
return this.videoDetailsArrayList.get(position);
}
@Override
public long getItemId(int position) {
return (long)position;
}
@Override
public View getView(int position, View convertView, ViewGroup viewGroup) {
if(inflater==null){
inflater = this.activity.getLayoutInflater();
}
if( convertView==null){
convertView = inflater.inflate(R.layout.list_item, null);
}
ImageView imageView = convertView.findViewById(R.id.ImageView);
TextView textView = convertView.findViewById(R.id.titleofitem);
LinearLayout linearLayout = convertView.findViewById(R.id.root);
final VideoDetails videoDetails = this.videoDetailsArrayList.get(position);
linearLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(activity, com.app.youtubedownloader.VideoPlay.class);
i.putExtra("videoId",videoDetails.getVideoID());
activity.startActivity(i);
}
});
Picasso.get().load(videoDetails.getUrl()).into(imageView);
textView.setText(videoDetails.getTitle());
return convertView;
}
@Override
public int getCount() {
return this.videoDetailsArrayList.size();
}
}
这是给吸气剂和装夹剂的
public class VideoDetails {
public String videoID, title, description, url;
public VideoDetails(String videoID,String title,String description,String url){
this.videoID = videoID;
this.title = title;
this.description = description;
this.url = url;
}
public VideoDetails(){
}
public String getVideoID() {
return videoID;
}
public void setVideoID(String videoID) {
this.videoID = videoID;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
我认为不需要XML文件。谢谢！ 附言我试图用邮递员测试我的url请求，并且它有效。 编辑：
"kind": "youtube#searchListResponse",
"etag": "\"p4VTdlkQv3HQeTEaXgvLePAydmU/zXtOj-qJByP8JvZOdTDcmmhSWNY\"",
"nextPageToken": "CAMQAA",
"regionCode": "MD",
"pageInfo": {
"totalResults": 1000000,
"resultsPerPage": 3
},
"items": [
{
"kind": "youtube#searchResult",
"etag": "\"p4VTdlkQv3HQeTEaXgvLePAydmU/XnyDQHIyLKnsfFTz76JxER0AjMg\"",
"id": {
"kind": "youtube#video",
"videoId": "aBABkTN8n_w"
},
"snippet": {
"publishedAt": "2018-12-17T12:07:35.000Z",
"channelId": "UCod_t2sXD_gRI11yFFGkoXg",
"title": "Best Funny Videos 2018 ● Cute girls doing funny things P3",
"description": "Hi my friends, please check our new compilation. Here is moments people funny videos and we hope that this video make your life more fun & you enjoy it ...",
"thumbnails": {
"default": {
"url": "https://i.ytimg.com/vi/aBABkTN8n_w/default.jpg",
"width": 120,
"height": 90
},
"medium": {
"url": "https://i.ytimg.com/vi/aBABkTN8n_w/mqdefault.jpg",
"width": 320,
"height": 180
},
"high": {
"url": "https://i.ytimg.com/vi/aBABkTN8n_w/hqdefault.jpg",
"width": 480,
"height": 360
}
},
"channelTitle": "Vines best fun",
"liveBroadcastContent": "none"
}
},
{
"kind": "youtube#searchResult",
"etag": "\"p4VTdlkQv3HQeTEaXgvLePAydmU/W8J9Seta9NO6dAqIWb5gcwfliPo\"",
"id": {
"kind": "youtube#video",
"videoId": "BgluGCjZKjM"
},
"snippet": {
"publishedAt": "2017-06-20T17:26:22.000Z",
"channelId": "UCeiZcfuj0r1ggNl0N_DVOgQ",
"title": "Best FAILS & Funny Videos ★ June 2017 Compilation ★ FailCity",
"description": "Best fails and funny videos compilation of the June 2017! Every week there's new funny fails and awesome win fail video compilations! ＳＵＢＳＣＲＩＢＥ ғᴏʀ ᴍᴏʀᴇ ...",
"thumbnails": {
"default": {
"url": "https://i.ytimg.com/vi/BgluGCjZKjM/default.jpg",
"width": 120,
"height": 90
},
"medium": {
"url": "https://i.ytimg.com/vi/BgluGCjZKjM/mqdefault.jpg",
"width": 320,
"height": 180
},
"high": {
"url": "https://i.ytimg.com/vi/BgluGCjZKjM/hqdefault.jpg",
"width": 480,
"height": 360
}
},
"channelTitle": "Net Fail",
"liveBroadcastContent": "none"
}
},
{
"kind": "youtube#searchResult",
"etag": "\"p4VTdlkQv3HQeTEaXgvLePAydmU/sy1iQ191YnpipX54MZQ-Z-bd2YU\"",
"id": {
"kind": "youtube#channel",
"channelId": "UCUd0dDUCXsjBPnG1qeUHZLw"
},
"snippet": {
"publishedAt": "2011-01-17T15:26:32.000Z",
"channelId": "UCUd0dDUCXsjBPnG1qeUHZLw",
"title": "funnyvideos",
"description": "",
"thumbnails": {
"default": {
"url": "https://yt3.ggpht.com/-mULWh9j1SAI/AAAAAAAAAAI/AAAAAAAAAAA/wtk972XjVNk/s88-c-k-no-mo-rj-c0xffffff/photo.jpg"
},
"medium": {
"url": "https://yt3.ggpht.com/-mULWh9j1SAI/AAAAAAAAAAI/AAAAAAAAAAA/wtk972XjVNk/s240-c-k-no-mo-rj-c0xffffff/photo.jpg"
},
"high": {
"url": "https://yt3.ggpht.com/-mULWh9j1SAI/AAAAAAAAAAI/AAAAAAAAAAA/wtk972XjVNk/s800-c-k-no-mo-rj-c0xffffff/photo.jpg"
}
},
"channelTitle": "funnyvideos",
"liveBroadcastContent": "upcoming"
}
}
]
}
答案 0 :(得分：0)
哦，我想我明白了。看起来您的响应返回正常，并且在处理每个“项目”的“ for”循环时，您正在获取对象“ id”，并且在该对象内部，您正在寻找“ videoId”。除三个结果中的最后一个以外，其他所有条件都很好，邮递员的结果如下所示：
{
"kind": "youtube#searchResult",
"etag": "\"p4VTdlkQv3HQeTEaXgvLePAydmU/sy1iQ191YnpipX54MZQ-Z-bd2YU\"",
"id": {
"kind": "youtube#channel",
"channelId": "UCUd0dDUCXsjBPnG1qeUHZLw"
},
它具有channelId而不是videoId。您应该做的是将每个JSON表达式捕获在自己的try / catch块中，这样一个不好的响应不会停止整个结果。像这样：
JSONObject jsonObject1 = jsonArray.getJSONObject(i);
JSONObject jsonId = jsonObject1.getJSONObject("id");
String video_id = "";
String channel_id = "";
try {
video_id = jsonId.getString("videoId");
}catch(JSONException e) {
channel_id = jsonId.getString("channelId");
}
您可以尝试添加更多日志记录，然后在运行代码时，至少可以通过查看日志来了解正在发生的情况：
public void displayVideos(){
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
url = "https://www.googleapis.com/youtube/v3/search?" + "part=" + part + "&q=" + keySearch + "&maxResults=3" + "&order=" + order + "&key=" + API_KEY;
Log.i("My App", "url=" + url);
StringRequest stringRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.i("My App", "response=" + response);
try{
Log.i("My App", "before jsonObject");
JSONObject jsonObject = new JSONObject(response);
Log.i("My App", "after jsonObject:" + jsonObject.toString());
Log.i("My App", "before jsonArray");
JSONArray jsonArray = jsonObject.getJSONArray("items");
Log.i("My App", "after jsonArray: count=" + jsonArray.length());
for(int i=0; i<jsonArray.length(); i++){
Log.i("My App", "before jsonObject1");
JSONObject jsonObject1 = jsonArray.getJSONObject(i);
Log.i("My App", "after jsonObject1:" + jsonObject1.toString());
Log.i("My App", "before jsonVideoId");
JSONObject jsonVideoId = jsonObject1.getJSONObject("id");
Log.i("My App", "after jsonVideoId:" + jsonVideoId.toString());
... (your other code here)
Log.i("My App", "before videoId");
String video_id = jsonVideoId.getString("videoId");
Log.i("My App", "after videoId:" + video_id);
... (your other code here)
}
listView.setAdapter(myadapter);
myadapter.notifyDataSetChanged();
} catch(JSONException e){
Log.e("My App", e.getLocalizedMessage());
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("My App", error.getMessage());
Toast.makeText(getApplicationContext(),error.getMessage(),Toast.LENGTH_LONG).show();
}
});
requestQueue.add(stringRequest);
}
}