上传图像中的未知错误：从 asynchttpResponsehandler 派生的类匿名类必须声明为抽象

Question

我是新手 如果可能，请查看以下代码我不明白问题我的程序正在尝试将文件上传到服务器。但是在这部分代码中有一个我无法理解的错误

错误：从 asynchttpResponsehandler 派生的类匿名类必须声明为抽象或在 asynchttpResponsehandler 中实现抽象方法 onsuccess()

package com.ehhg.upap1;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
 import android.net.Uri;
import android.os.Build;
import android.preference.PreferenceActivity;
import android.provider.MediaStore;
import android.support.v4.app.ActivityCompat;
 import android.support.v4.content.ContextCompat;
 import android.support.v4.text.PrecomputedTextCompat;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.text.PrecomputedText;
 import android.view.View;
 import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.Toast;
 import android.Manifest;
 import com.loopj.android.http.AsyncHttpClient;
 import com.loopj.android.http.AsyncHttpRequest;
 import com.loopj.android.http.*;
 import com.loopj.android.http.RequestParams;
 import com.squareup.picasso.Picasso;
 import org.json.JSONException;
 import org.json.JSONObject;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.nio.file.FileSystemNotFoundException;
 import java.security.acl.Permission;
 import java.util.jar.Manifest.*;
 import cz.msebera.android.httpclient.entity.mime.Header;


public void uploadImage(File file) {
    AsyncHttpClient myClient = new AsyncHttpClient();

    RequestParams params = new RequestParams();
    try {
        params.put("file", file);
    } catch (FileNotFoundException e) {
    }
    myClient.post(url + "android/upload.php", params, new AsyncHttpResponseHandler() {

      @Override
        public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
            try {
                JSONObject jsonObject = new JSONObject(new String(responseBody));
                if (jsonObject.getString("status").equals("success")) {
                    Picasso.with(getBaseContext())
                            .load(url + "android/uploads/" + jsonObject.getString("filename"))
                            .into(img);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

        }


        public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
            Toast.makeText(getBaseContext(), new String(responseBody), Toast.LENGTH_LONG).show();
        }
    });
}

Answer 1

错误说AsyncHttpResponseHandler必须实现onSuccess函数。

编辑：在检查了其他用户评论的导入后，您导入了错误的 Header 类。您需要导入 cz.msebera.android.httpclient.Header 而不是 cz.msebera.android.httpclient.entity.mime.Header 类。

看下面的代码来理解

myClient.post(url + "android/upload.php", params, new AsyncHttpResponseHandler() {

    // following line is uncommented
    @Override
    public void onSuccess(int statusCode, cz.msebera.android.httpclient.Header[] headers, byte[] responseBody) {
        try {
            JSONObject jsonObject = new JSONObject(new String(responseBody));
            if (jsonObject.getString("status").equals("success")) {
                Picasso.with(getBaseContext())
                        .load(url + "android/uploads/" + jsonObject.getString("filename"))
                        .into(img);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

    }


    public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
        Toast.makeText(getBaseContext(), new String(responseBody), Toast.LENGTH_LONG).show();
    }
});

希望对你有帮助。