Android Dropbox V2 NetworkOnMainThreadException

一段时间以来，我一直在努力让Dropbox V2与我的应用程序配合使用，我不知道还能做些什么。我基本上遵循了在线教程和其他来源，但我不断地遇到错误，使我无法继续前进。奇怪的是，当我第一次输入新代码时，它工作得很好。一旦我开始添加确认上传成功的警报或其他任何东西，它在尝试登录时就开始出错。我感觉应用程序仍然是通过旧代码登录的，但我无法确认这一点，因为当时我没有保存项目的副本。我试着将代码放在一个单独的线程中，但仍然会出错。好像它没有像应该的那样连接到API，但我不知道我在这里做错了什么。我将应用程序密钥放在令牌上，这意味着什么不同吗？ 这是我的密码：

try {
        DbxRequestConfig config = new DbxRequestConfig("dropbox/java-tutorial");
        client = new DbxClientV2(config, "token");

        // Get current account info
        FullAccount account = client.users().getCurrentAccount();
        System.out.println(account.getName().getDisplayName());

        // Get files and folder metadata from Dropbox root directory
        ListFolderResult result = client.files().listFolder("");
        while (true) {
            for (Metadata metadata : result.getEntries()) {
                System.out.println(metadata.getPathLower());
            }

            if (!result.getHasMore()) {
                break;
            }

            result = client.files().listFolderContinue(result.getCursor());
        }
    } catch(DbxException e){}

以及文件上载代码：

Thread t = new Thread(new Runnable() {
                @Override
                public void run() {
                    Exception mException=null;
                    FileMetadata metadata=null;
                    try {
                        // Upload "test.txt" to Dropbox
                        //dialog.dismiss();
                        metadata = client.files().uploadBuilder("/"+title+".sheet").uploadAndFinish(fis);

                    }  catch(DbxException e){
                        mException = e;
                    }
                    catch(IOException e){
                        mException = e;
                    }

                    if (mException != null) {
                        //dialog.dismiss();
                        final Exception finalE = mException;
                        Handler h = new Handler(Looper.getMainLooper());
                        h.post(new Runnable() {
                            public void run() {
                                Log.e(TAG, "Failed to upload file.", finalE);
                                Toast.makeText(MainActivity.this,
                                        "An error has occurred",
                                        Toast.LENGTH_SHORT)
                                        .show();
                            }
                        });
                    } else if (metadata == null) {
                        //dialog.dismiss();
                        final Exception finalE = mException;
                        Handler h = new Handler(Looper.getMainLooper());
                        h.post(new Runnable() {
                            public void run() {
                                Log.e(TAG, "Failed to upload file.", finalE);
                                Toast.makeText(MainActivity.this,
                                        "An error has occurred",
                                        Toast.LENGTH_SHORT)
                                        .show();
                            }
                        });
                    } else {
                        //dialog.dismiss();
                        final String message = metadata.getName() + " size " + metadata.getSize() + " modified " +
                                DateFormat.getDateTimeInstance().format(metadata.getClientModified());
                        Handler h = new Handler(Looper.getMainLooper());
                        h.post(new Runnable() {
                            public void run() {
                                Toast.makeText(MainActivity.this,
                                        message,
                                        Toast.LENGTH_SHORT)
                                        .show();
                            }
                        });

                    }
                }
            });
            t.start();

---

任何想法或提示都将不胜感激。

最终通过异步任务解决。我也未能获得身份验证令牌，而是愚蠢地使用我的密钥

异步任务：

import android.content.Context;
import android.os.AsyncTask;
import com.dropbox.core.DbxException;
import com.dropbox.core.v2.DbxClientV2;
import com.dropbox.core.DbxRequestConfig;
import com.dropbox.core.v2.users.FullAccount;

public class ConnectToDB extends AsyncTask<String, Void, FullAccount> {
    private final Context mContext;
    private DbxClientV2 mDbxClient;
    private Exception mException;
    private String token;
    private Callback mCallback;

    public interface Callback {
        void onLoginComplete(FullAccount result, DbxClientV2 client);
        void onError(Exception e);
    }

    ConnectToDB(Context context, String token, Callback callback) {
        mContext = context;
        this.token=token;
        mCallback=callback;
    }

    @Override
    protected void onPostExecute(FullAccount result) {
        super.onPostExecute(result);
        if (mException != null) {
            mCallback.onError(mException);
        } else if (result == null) {
            mCallback.onError(null);
        } else {
            mCallback.onLoginComplete(result, mDbxClient);
        }
    }

    @Override
    protected FullAccount doInBackground(String... params) {
        DbxRequestConfig config = new DbxRequestConfig("appName");
        mDbxClient = new DbxClientV2(config, this.token);

        try {
            // Get current account info
            return mDbxClient.users().getCurrentAccount();
        }catch (DbxException e){
            mException = e;
        }
        return null;
    }
}

可能重复的

public void initDropBox(){
    if (prefs.getString("dbKey", "").equals("")) {
        Auth.startOAuth2Authentication(this,"appKey");
        prefs.edit().putString("dbKey", Auth.getOAuth2Token()).commit();
    }else{
        initAndLoadData(prefs.getString("dbKey", ""));
    }
}
@Override
protected void onResume()
{
    super.onResume();
    try{
        String accessToken = prefs.getString("dbKey",null);
        if (accessToken == null) {
            accessToken = Auth.getOAuth2Token();
            if (accessToken != null) {
                prefs.edit().putString("dbKey", accessToken).apply();
                initAndLoadData(accessToken);
            }
        }else{
            initAndLoadData(accessToken);
        }
    }catch(Exception e){}
}
private void initAndLoadData(String accessToken) {
    final MainActivity context = this;
    new ConnectToDB(this, accessToken, new ConnectToDB.Callback() {
        @Override
        public void onLoginComplete(FullAccount result, DbxClientV2 client) {
            context.client = client;
            Log.e(TAG, "Success.", null);
        }

        @Override
        public void onError(Exception e) {
            Log.e(TAG, "Failed to login.", e);
            Toast.makeText(MainActivity.this,
                    "An error has occurred",
                    Toast.LENGTH_SHORT)
                    .show();
        }
    }).execute();
}