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我想製作一個小應用程序，它將在YouTube上搜索關鍵字並返回視頻列表。然後，我將使用該數據填充列表視圖。我正在嘗試使用YouTube數據api v3並使用此示例https://developers.google.com/youtube/v3/code_samples/java#search_by_keyword。但我得到這個錯誤。列表總是返回null。任何想法爲什麼？Youtube使用android api搜索
08-29 13:55:31.036: E/dalvikvm(32294): Could not find class 'com.google.api.services.youtube.YouTube$Builder', referenced from method com.example.youtubetomusic.YouTubeSearch.mainSearch
08-29 13:55:31.036: W/dalvikvm(32294): VFY: unable to resolve new-instance 2357 (Lcom/google/api/services/youtube/YouTube$Builder;) in Lcom/example/youtubetomusic/YouTubeSearch;
08-29 13:55:31.036: D/dalvikvm(32294): VFY: replacing opcode 0x22 at 0x0000
08-29 13:55:31.036: D/dalvikvm(32294): DexOpt: unable to opt direct call 0x57c4 at 0x0b in Lcom/example/youtubetomusic/YouTubeSearch;.mainSearch
08-29 13:55:31.076: I/Adreno-EGL(32294): <qeglDrvAPI_eglInitialize:320>: EGL 1.4 QUALCOMM Build: I0404c4692afb8623f95c43aeb6d5e13ed4b30ddbDate: 11/06/13
08-29 13:55:31.096: D/OpenGLRenderer(32294): Enabling debug mode 0
08-29 13:55:38.146: W/System.err(32294): java.lang.NoClassDefFoundError: com.google.api.services.youtube.YouTube$Builder
08-29 13:55:38.166: D/dalvikvm(32294): GC_FOR_ALLOC freed 231K, 2% free 16978K/17240K, paused 13ms, total 13ms
08-29 13:55:38.166: W/System.err(32294): at com.example.youtubetomusic.YouTubeSearch.mainSearch(YouTubeSearch.java:38)
08-29 13:55:38.166: W/System.err(32294): at com.example.youtubetomusic.YoutubeMain$1.onClick(YoutubeMain.java:31)
08-29 13:55:38.166: W/System.err(32294): at android.view.View.performClick(View.java:4438)
08-29 13:55:38.166: W/System.err(32294): at android.view.View$PerformClick.run(View.java:18422)
08-29 13:55:38.166: W/System.err(32294): at android.os.Handler.handleCallback(Handler.java:733)
08-29 13:55:38.166: W/System.err(32294): at android.os.Handler.dispatchMessage(Handler.java:95)
08-29 13:55:38.166: W/System.err(32294): at android.os.Looper.loop(Looper.java:136)
08-29 13:55:38.166: W/System.err(32294): at android.app.ActivityThread.main(ActivityThread.java:5001)
08-29 13:55:38.166: W/System.err(32294): at java.lang.reflect.Method.invokeNative(Native Method)
08-29 13:55:38.166: W/System.err(32294): at java.lang.reflect.Method.invoke(Method.java:515)
08-29 13:55:38.166: W/System.err(32294): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
08-29 13:55:38.166: W/System.err(32294): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
08-29 13:55:38.166: W/System.err(32294): at dalvik.system.NativeStart.main(Native Method)
08-29 13:55:38.166: I/System.out(32294): null
我的代碼看起來像這樣
package com.example.youtubetomusic;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Properties;
import com.google.api.client.googleapis.json.GoogleJsonResponseException;
import com.google.api.client.http.HttpRequest;
import com.google.api.client.http.HttpRequestInitializer;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.services.youtube.YouTube;
import com.google.api.services.youtube.model.SearchListResponse;
import com.google.api.services.youtube.model.SearchResult;
public class YouTubeSearch {
private static final String PROPERTIES_FILENAME = "youtube.properties";
private final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
private final JsonFactory JSON_FACTORY = new JacksonFactory();
private final long NUMBER_OF_VIDEOS_RETURNED = 10;
private YouTube youtube;
private String nextToken;
public List<SearchResult> mainSearch(String userEnteredText) {
// Read the developer key from youtube.properties
Properties properties = new Properties();
try {
InputStream in = YouTubeSearch.class.getResourceAsStream("/" + PROPERTIES_FILENAME);
properties.load(in);
} catch (IOException e) {
System.err.println("There was an error reading " + PROPERTIES_FILENAME + ": " + e.getCause()
+ " : " + e.getMessage());
System.exit(1);
}
try {
youtube = new YouTube.Builder(Auth.HTTP_TRANSPORT, Auth.JSON_FACTORY, new HttpRequestInitializer() {
public void initialize(HttpRequest request) throws IOException {
}
}).setApplicationName("youtube-cmdline-search-sample").build();
// Get query term from user.
String queryTerm = userEnteredText;/*getInputQuery();*/
YouTube.Search.List search = youtube.search().list("id,snippet");
String apiKey = properties.getProperty("youtube.apikey");
search.setKey(apiKey);
search.setQ(queryTerm);
/*
* We are only searching for videos (not playlists or channels). If we were searching for
* more, we would add them as a string like this: "video,playlist,channel".
*/
search.setType("video");
/*
* This method reduces the info returned to only the fields we need and makes calls more
* efficient.
*/
search.setFields("items(id/kind,id/videoId,snippet/title,snippet/publishedAt,snippet/thumbnails/default/url),nextPageToken");
search.setMaxResults(NUMBER_OF_VIDEOS_RETURNED);
SearchListResponse searchResponse = search.execute();
List<SearchResult> searchResultList = searchResponse.getItems();
nextToken=searchResponse.getNextPageToken();
if (searchResultList != null) {
return (searchResultList);
}
} catch (GoogleJsonResponseException e) {
System.err.println("There was a service error: " + e.getDetails().getCode() + " : "
+ e.getDetails().getMessage());
} catch (IOException e) {
System.err.println("There was an IO error: " + e.getCause() + " : " + e.getMessage());
} catch (Throwable t) {
t.printStackTrace();
}
return null;
}
}