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

Question

我的代码如下。它在Android Studio中出错。有人请帮助我。我的PHP代码没问题，但为什么会出现这个错误？

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();


    }
}

而我的Background.java代码是

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();
    }
}

我的Androidmanifest.xml是

<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" />

Android Studio错误是：

E / AndroidRuntime：FATAL EXCEPTION：AsyncTask＃1进程：com.example.smtanverhossain.myphpmysqlapplication，PID：5445 java.lang.RuntimeException：在android.os.AsyncTask $ 3.done（AsyncTask.java）上执行doInBackground（）时发生错误：300）at java.util.concurrent.FutureTask.finishCompletion（FutureTask.java:355）at java.util.concurrent.FutureTask.setException（FutureTask.java:222）at java.util.concurrent.FutureTask.run（FutureTask。 java：242）在android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:231）java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112）java.util.concurrent.ThreadPoolExecutor $ Worker。在java.lang.Thread.run上运行（ThreadPoolExecutor.java:587）（Thread.java:818）引起：java.lang.ClassCastException：com.android.okhttp.internal.http.HttpURLConnectionImpl无法强制转换为javax.net com.example.smtanverho的com.example.smtanverhossain.myphpmysqlapplication.BackgroundTask.doInBackground（BackgroundTask.java:46）中的.ssl.HttpsURLConnection在Android的java.util.concurrent.FutureTask.run（FutureTask.java:237）的android.os.AsyncTask $ 2.call（AsyncTask.java:288）上的ssain.myphpmysqlapplication.BackgroundTask.doInBackground（BackgroundTask.java:19）。 os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:231）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112）java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:587） ）在java.lang.Thread.run（Thread.java:818）

Answer 1

该错误在日志中解释：Caused by: java.lang.ClassCastException: com.android.okhttp.internal.http.HttpURLConnectionImpl cannot be cast to javax.net.ssl.HttpsURLConnection

这意味着您无法在此行投射到HttpsURLConnection：

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

这是因为您的URL使用HTTP而不是HTTPS。当你用url.openConnection()调用HTTP时，它返回一个HttpURLConnection，同样适用于HTTPS。这在documentation中说明。

解决方案应该是用HttpsURLConnection替换所有HttpURLConnection并将铸件移除到HttpsURLConnection。

Answer 2

@Tohu的解决方案可能会解决你的强制转换错误，我想把你带到你的视线，你正在通过调用finish()将你正在破坏的活动的上下文传递给asynktask，这可能会给你一个错误用活动背景显示烤面包。因此，请确保提供有效的上下文，例如： - 。

getApplicationContext()