通过在我的Android应用中使用Google YouTube API V3，RuntimeException

Question

我想从YouTube频道获取视频列表。

您将在下面看到与此类相互作用的YouTube和我的活动。我会得到一个例外" java.lang.runtimeException：无法启动活动videoListactivity "呼叫 youtube.search.list.list.execute（）;

我是Android的新手，所以我认为这是一个愚蠢的错误。请帮助找到它，或者建议另一种方式从YouTube获取数据。

youtubeconnector类

import com.google.api.client.http.HttpRequest;
import com.google.api.client.http.HttpRequestInitializer;
import com.google.api.client.http.javanet.NetHttpTransport;
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;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class YoutubeConnector {
    private static YouTube youtube;
    private static YouTube.Search.List query;
    public static final String KEY = DeveloperKey.DEVELOPER_KEY;
    public static List<VideoItem> search() throws IOException {
        youtube = new YouTube.Builder(new NetHttpTransport(), new JacksonFactory(), new HttpRequestInitializer() {
            @Override
            public void initialize(HttpRequest httpRequest) throws IOException {
            }
        }).setApplicationName(R.string.app_name).build();
        query = youtube.search().list("id,snippet");
        query.setKey(KEY);
        query.setType("video");
        query.setChannelId("**************");
        query.setFields("items(id/videoId,snippet/title,snippet/description,snippet/thumbnails/default/url)");
        SearchListResponse response = query.execute();
        List<SearchResult> results = response.getItems();
        List<VideoItem> items = new ArrayList<VideoItem>();
        for (SearchResult result : results) {
            VideoItem item = new VideoItem();
            item.setTitle(result.getSnippet().getTitle());
            item.setDescription(result.getSnippet().getDescription());
            item.setThumbnailURL(result.getSnippet().getThumbnails().getDefault().getUrl());
            item.setId(result.getId().getVideoId());
            items.add(item);
        }
        return items;
    }
}

视频抗性类

public class VideoListActivity extends ListActivity{
    List<VideoItem> videoFileList;
    public class VideoAapter extends ArrayAdapter{
    //.....................
    }
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        try {
            videoFileList = YoutubeConnector.search();
        } catch (IOException e) {
            e.printStackTrace();
        }
        setListAdapter(new VideoAapter(VideoListActivity.this, R.layout.list_item_video, videoFileList));
    }
}

logcat

06-16 18:14:56.926 30817-30817/com.example.alex.youtubecanal W/art: Failed to find OatDexFile for DexFile /data/data/com.example.alex.youtubecanal/files/instant-run/dex/slice-slice_5-classes.dex ( canonical path /data/data/com.example.alex.youtubecanal/files/instant-run/dex/slice-slice_5-classes.dex) with checksum 0x7eb43558 in OatFile /data/data/com.example.alex.youtubecanal/cache/slice-slice_5-classes.dex
06-16 18:14:57.631 30817-30817/com.example.alex.youtubecanal I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
06-16 18:14:57.631 30817-30817/com.example.alex.youtubecanal I/System.out: (HTTPLog)-Static: isShipBuild true
06-16 18:14:57.631 30817-30817/com.example.alex.youtubecanal I/System.out: (HTTPLog)-Thread-1-786658172: SmartBonding Enabling is false, SHIP_BUILD is true, log to file is false, DBG is false
06-16 18:14:57.631 30817-30817/com.example.alex.youtubecanal I/System.out: (HTTPLog)-Thread-1-786658172: SMARTBONDING_FEATURE_ENABLED is false
06-16 18:14:57.636 30817-30817/com.example.alex.youtubecanal I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
06-16 18:14:57.636 30817-30817/com.example.alex.youtubecanal I/System.out: KnoxVpnUidStorageknoxVpnSupported API value returned is false
06-16 18:14:57.636 30817-30817/com.example.alex.youtubecanal D/AndroidRuntime: Shutting down VM
06-16 18:14:57.641 30817-30817/com.example.alex.youtubecanal E/AndroidRuntime: FATAL EXCEPTION: main
                                                                               Process: com.example.alex.youtubecanal, PID: 30817
                                                                               java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.alex.youtubecanal/com.example.alex.youtubecanal.VideoListActivity}: android.os.NetworkOnMainThreadException
                                                                                   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3133)
                                                                                   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3243)
                                                                                   at android.app.ActivityThread.access$1000(ActivityThread.java:218)
                                                                                   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1718)
                                                                                   at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                   at android.os.Looper.loop(Looper.java:145)
                                                                                   at android.app.ActivityThread.main(ActivityThread.java:6917)
                                                                                   at java.lang.reflect.Method.invoke(Native Method)
                                                                                   at java.lang.reflect.Method.invoke(Method.java:372)
                                                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
                                                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
                                                                                Caused by: android.os.NetworkOnMainThreadException
                                                                                   at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)
                                                                                   at java.net.InetAddress.lookupHostByName(InetAddress.java:418)
                                                                                   at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)
                                                                                   at java.net.InetAddress.getAllByName(InetAddress.java:215)
                                                                                   at com.android.okhttp.HostResolver$1.getAllByName(HostResolver.java:29)
                                                                                   at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:245)
                                                                                   at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:128)
                                                                                   at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:370)
                                                                                   at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:298)
                                                                                   at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:399)
                                                                                   at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:110)
                                                                                   at com.android.okhttp.internal.http.DelegatingHttpsURLConnection.connect(DelegatingHttpsURLConnection.java:89)
                                                                                   at com.android.okhttp.internal.http.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:25)
                                                                                   at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:93)
                                                                                   at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:981)
                                                                                   at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:419)
                                                                                   at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:352)
                                                                                   at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:469)
                                                                                   at com.example.alex.youtubecanal.YoutubeConnector.search(YoutubeConnector.java:37)
                                                                                   at com.example.alex.youtubecanal.VideoListActivity.onCreate(VideoListActivity.java:58)
                                                                                   at android.app.Activity.performCreate(Activity.java:6609)
                                                                                   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1134)
                                                                                   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3086)
                                                                                   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3243) 
                                                                                   at android.app.ActivityThread.access$1000(ActivityThread.java:218) 
                                                                                   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1718) 
                                                                                   at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                                   at android.os.Looper.loop(Looper.java:145) 
                                                                                   at android.app.ActivityThread.main(ActivityThread.java:6917) 
                                                                                   at java.lang.reflect.Method.invoke(Native Method) 
                                                                                   at java.lang.reflect.Method.invoke(Method.java:372) 
                                                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404) 
                                                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199) 

Answer 1

您需要在异步线程中运行onCreate()外的YoutubeConnector.search。这基本上意味着该方法正在拖延程序，并导致程序崩溃或挂起。要修复，创建一个名为搜索的新类，例如：

searchClass.java：

import android.os.AsyncTask;
import java.io.IOException;
public class Search extends AsyncTask<String, Void, Void> {
    @Override
    protected Void doInBackground(String... params) {
        try {
            videoFileList = YoutubeConnector.search();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
    @Override
    protected void onPostExecute(String a){
        VideoListActivity.context.updateAdapter();
    }
}

videoListactivity.java：

public class VideoListActivity extends ListActivity{
    static List<VideoItem> videoFileList;
    static Context context;
    public class VideoAapter extends ArrayAdapter{
    //.....................
    }
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Search search= new Search();
        search.execute(new String[]{});

    }
    public void updateAdapter(ArrayList<String> list) {
        setListAdapter(new VideoAapter(VideoListActivity.this,R.layout.list_item_video, videoFileList));
     }
}

希望这会起作用:)。如果没有，只需发布错误，我们就会返回。祝你好运！

Answer 2

看起来这个问题来自networkonmainthreadexception。查看此示例。希望它有帮助！