E/AndroidRuntime：致命异常：Android的AsyncTask#1错误

Question

我的代码在下面。它在Android Studio中给出了一个错误。任何人请帮帮我。我的PHP代码是可以的，但是为什么它会给出这个错误呢？

register.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class Register extends AppCompatActivity {
    EditText et_name, et_number;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);

        et_name = (EditText) findViewById(R.id.nametxt);
        et_number = (EditText) findViewById(R.id.numbertxt);

    }

    public void userReg(View view){

        String names = et_name.getText().toString();
        String numbers = et_number.getText().toString();

        String method = "register";
        BackgroundTask backgroundTask = new BackgroundTask(this);
        backgroundTask.execute(method,names,numbers);
        finish();


    }
}

import android.content.Context;
import android.net.Uri;
import android.os.AsyncTask;
import android.widget.Toast;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;

import javax.net.ssl.HttpsURLConnection;

public class BackgroundTask extends AsyncTask<String,Void,String> {

    Context ctx;

    BackgroundTask(Context ctx){

        this.ctx = ctx;

    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(String... params) {
        String reg_url = "http://192.168.1.2/logins/register.php";
        String method = params[0];
        if(method.equals("register")){

            String name = params[1];
            String number = params[2];
            try {
                URL url = new URL(reg_url);
                HttpsURLConnection httpsURLConnection = (HttpsURLConnection) url.openConnection();
                httpsURLConnection.setRequestMethod("POST");
                httpsURLConnection.setDoOutput(true);
                OutputStream os = httpsURLConnection.getOutputStream();
                BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(os,"UTF-8"));
                String data = URLEncoder.encode("names","UTF-8")+"="+URLEncoder.encode(name,"UTF-8")+"&"
                        +URLEncoder.encode("numbers","UTF-8")+"="+URLEncoder.encode(number,"UTF-8");
                bufferedWriter.write(data);
                bufferedWriter.flush();
                bufferedWriter.close();
                os.close();
                InputStream IS = httpsURLConnection.getInputStream();
                IS.close();
                return "Registration Success...";
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }


        }

        return null;
    }

    @Override
    protected void onProgressUpdate(Void... values) {
        super.onProgressUpdate(values);
    }

    @Override
    protected void onPostExecute(String result) {
        Toast.makeText(ctx,result,Toast.LENGTH_LONG).show();
    }
}

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

E/AndroidRuntime：致命异常：AsyncTask#1进程：com.example.SmTanverHossain.MyphpMysqlApplication，PID:5445 java.lang.RuntimeException：在Android.os.AsyncTask$3执行doInBackground（）时出错。done(AsyncTask.java:300)在java.util.concurrent.FutureTask.FinishCompletion(futureTask.java:355)在java.util.concurrent.FutureTask.SetExceptionssain.myphpMysqlApplication.BackgroundTask.DoinBackground(BackgroundTask.java:19)在Android.os.AsyncTask$2。call(asynctask.java:288)在java.util.concurrent.FutureTask.run(FutureTask.java:237)在Android.os.AsyncTask$SerialExecutor$1。run(asynctask.java:231) 在java.util.concurrent.ThreadPoolExecutor.RunWorker（ThreadPoolExecutor.java:1112) 在java.util.concurrent.ThreadPoolExecutor$worker.run(ThreadPoolExecutor.java:587) 在java.lang.Thread.Run（thread.java:818)

Answer 1

日志中解释了该错误:导致的原因：java.lang.ClassCastException：com.android.okhttp.internal.http.httpurlConnectionImpl不能强制转换为javax.net.ssl.httpsurlConnection

这意味着您不能在此行强制转换为HttpSurlConnection:

HttpsURLConnection httpsURLConnection = (HttpsURLConnection) url.openConnection();

这是因为您的URL使用http而不是https。当您使用http调用url.openconnection()时，它将返回httpurlconnection并且同样适用于https。这在文件中有说明。

解决方案应该是将所有httpsurlconnection替换为httpsurlconnection，并删除对httpsurlconnection的强制转换。