java - Android 中的自定义异步 Http 客户端

Question

我使用 https://github.com/loopj/android-async-http但我认为这可以应用于异步任务( native 任务)

AsyncHttpClient client = new AsyncHttpClient();
client.get("http://www.google.com", new AsyncHttpResponseHandler() {

    @Override
    public void onStart() {
        // called before request is started
       //Some debugging code here
    }

    @Override
    public void onSuccess(int statusCode, Header[] headers, byte[] response) {
        // called when response HTTP status is "200 OK"
        //here is the interesting part
    }

    @Override
    public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) {
        // called when response HTTP status is "4XX" (eg. 401, 403, 404)
         //Some debugging code here, show retry dialog, feedback etc. 
    }

    @Override
    public void onRetry(int retryNo) {
         //Some debugging code here-------

    }
});

我在许多单独的类(class)中经常使用它。 onStart、onFailure、onRetry到处都是一样的，只是复制粘贴而已，只是onSuccess不一样。

我想尽可能保持我的代码干净并重用我已经编写的代码，所以我的问题是，我如何在一个单独的"file"中进行自定义，然后再重用它。我只需要“OnSuccess”函数。谢谢

----------------------------------------

GET 和 POST 的解决方案(感谢 furkan3ayraktar)

第一个文件RequestListener

package com.classicharmony.krakenmessages.utils.AsyncHttp;
import org.apache.http.Header;
public interface RequestListener {
    public void onSuccess(int statusCode, Header[] headers, byte[] response);
}

第二个文件RequestHandler

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.util.Log;


import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;

import org.apache.http.Header;
import org.apache.http.entity.StringEntity;

import java.io.UnsupportedEncodingException;

public class RequestHandler {

    private static RequestHandler instance;

    private AsyncHttpClient client;
    private static final boolean SHOW_DEBUG_ALERT_DIALOG = true;

    private RequestHandler() {
        client = new AsyncHttpClient();

    }

    public static RequestHandler getInstance() {
        if (instance == null) {
            instance = new RequestHandler();
        }
        return instance;
    }


    public void make_get_Request(final Context context, final String url, final RequestListener listener) {
        client.get(url, new AsyncHttpResponseHandler() {

            @Override
            public void onStart() {
                Log.v("▒▒▒▒▒▒▒ GET ", url);
            }

            @Override
            public void onSuccess(int statusCode, Header[] headers, byte[] response) {
                listener.onSuccess(statusCode, headers, response);
            }

            @Override
            public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) {
                Log.e("▒▒▒▒▒▒▒ GET FAILED ", url);
                Log.e("▒▒▒▒▒▒▒ GET FAILED ", e.getLocalizedMessage());

                if (DUtils.isDebuggable(context) && SHOW_DEBUG_ALERT_DIALOG) {
                    AlertDialog.Builder builder = new AlertDialog.Builder(context);
                    builder.setTitle("▒▒▒▒▒ ERROR ▒▒▒▒▒");
                    String error_msg;
                    if (errorResponse != null) {
                        try {
                            error_msg = String.valueOf(new String(errorResponse, "UTF-8"));
                        } catch (UnsupportedEncodingException e1) {
                            error_msg = e.getLocalizedMessage();
                        }
                    } else {
                        error_msg = e.getLocalizedMessage();
                    }

                    builder.setMessage(context.getClass().getSimpleName() + " -> " + error_msg)
                            .setCancelable(true)
                            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int id) {
                                    dialog.dismiss();
                                }
                            });
                    AlertDialog alert = builder.create();
                    alert.show();
                }
            }

            @Override
            public void onRetry(int retryNo) {
                Log.e("▒▒▒▒▒▒▒ RETRYING ", "....." + String.valueOf(retryNo));

            }
        });
    }

    public void make_post_Request(final Context context, final StringEntity entity, final String url, final RequestListener listener) {
        client.post(context, url, entity, "application/json", new AsyncHttpResponseHandler() {

            @Override
            public void onStart() {
                Log.v("▒▒▒▒▒▒▒ POST ", url);
            }

            @Override
            public void onSuccess(int statusCode, Header[] headers, byte[] response) {
                listener.onSuccess(statusCode, headers, response);
            }

            @Override
            public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) {
                Log.e("▒▒▒▒▒▒▒ POST FAILED ", url);
                Log.e("▒▒▒▒▒▒▒ POST FAILED ", context.getClass().getSimpleName() + " -> " + e.getLocalizedMessage());


                if (DUtils.isDebuggable(context) && SHOW_DEBUG_ALERT_DIALOG) {
                    AlertDialog.Builder builder = new AlertDialog.Builder(context);
                    builder.setTitle("▒▒▒▒▒ ERROR ▒▒▒▒▒");
                    String error_msg;
                    if (errorResponse != null) {
                        try {
                            error_msg = String.valueOf(new String(errorResponse, "UTF-8"));
                        } catch (UnsupportedEncodingException e1) {
                            error_msg = e.getLocalizedMessage();
                        }
                    } else {
                        error_msg = e.getLocalizedMessage();
                    }

                    builder.setMessage(context.getClass().getSimpleName() + " -> " + error_msg)
                            .setCancelable(true)
                            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int id) {
                                    dialog.dismiss();
                                }
                            });
                    AlertDialog alert = builder.create();
                    alert.show();
                }

            }

            @Override
            public void onRetry(int retryNo) {
                Log.e("▒▒▒▒▒▒▒ RETRYING ", "....." + String.valueOf(retryNo));
            }
        });
    }

}

用于显示或不显示对话框的第三个“实用程序”。

public static boolean isDebuggable(Context ctx) {
    boolean debuggable = false;
    X500Principal DEBUG_DN = new X500Principal("CN=Android Debug,O=Android,C=US");
    try {
        PackageInfo pinfo = ctx.getPackageManager().getPackageInfo(ctx.getPackageName(), PackageManager.GET_SIGNATURES);
        Signature signatures[] = pinfo.signatures;

        CertificateFactory cf = CertificateFactory.getInstance("X.509");

        for (int i = 0; i < signatures.length; i++) {
            ByteArrayInputStream stream = new ByteArrayInputStream(signatures[i].toByteArray());
            X509Certificate cert = (X509Certificate) cf.generateCertificate(stream);
            debuggable = cert.getSubjectX500Principal().equals(DEBUG_DN);
            if (debuggable)
                break;
        }
    } catch (PackageManager.NameNotFoundException e) {
        //debuggable variable will remain false
    } catch (CertificateException e) {
        //debuggable variable will remain false
    }
    return debuggable;
}

如何为 POST 调用它的示例:

JSONObject jsonParams = new JSONObject();
        StringEntity entity;


        try {
            jsonParams.put("from_user_id", "dan");
            jsonParams.put("to_user_id", "vili");
            jsonParams.put("message", "hello world");
            entity = new StringEntity(jsonParams.toString());
        } catch (JSONException e) {
            e.printStackTrace();
            return;
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return;
        }

        RequestHandler handler = RequestHandler.getInstance();
        handler.make_post_Request(getActivity(), entity, "http://your_server/api/etc", new RequestListener() {
            @Override
            public void onSuccess(int statusCode, Header[] headers, byte[] response) {
                try {
                    String server_response = String.valueOf(new String(response, "UTF-8"));
                    Log.v("Server response",server_response);
                } catch (UnsupportedEncodingException e1) {

                }
            }
        });

Answer 1

您可以创建自己的 AsyncHttpResponseHandler 空版本，它不实现 onSuccess 方法。

public abstract class OWADVLHttpResponseHandler extends AsyncHttpResponseHandler {

    @Override
    public void onStart() {}

    @Override
    public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) {}

    @Override
    public void onRetry(int retryNo) {}
}

您的代码将如下所示:

AsyncHttpClient client = new AsyncHttpClient();
client.get("http://www.google.com", new OWADVLHttpResponseHandler() {
     @Override
     public void onSuccess(int statusCode, Header[] headers, byte[] response) {
      ....
    }
});

很明显，你可以在基类中的非覆盖方法中填写一些内容。