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

Question

我的代码如下。它在 Android Studio 中出错。任何人都请帮助我。我的 PHP 代码没问题，但为什么会出现此错误？

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();


    }
}

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();
    }
}

而我的Androidmainfest.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 Process: com.example.smtanverhossain.myphpmysqlapplication, PID: 5445 java.lang.RuntimeException: An error occured while executing doInBackground() at android.os.AsyncTask.done(AsyncTask.java: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) at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:818) Caused by: java.lang.ClassCastException: com.android.okhttp.internal.http.HttpURLConnectionImpl cannot be cast to javax.net.ssl.HttpsURLConnection at com.example.smtanverhossain.myphpmysqlapplication.BackgroundTask.doInBackground(BackgroundTask.java:46) at com.example.smtanverhossain.myphpmysqlapplication.BackgroundTask.doInBackground(BackgroundTask.java:19) at android.os.AsyncTask.call(AsyncTask.java:288) at java.util.concurrent.FutureTask.run(FutureTask.java:237) at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:818)

Answer 1

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

这意味着您不能在这一行转换为 HttpsURLConnection：

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

这是因为您的 URL 使用 HTTP 而不是 HTTPS。当你用 HTTP 调用 url.openConnection() 时，它 returns 一个 HttpURLConnection 并且同样适用于 HTTPS。 documentation.

中说明了这一点

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

Answer 2

@Tohu 的解决方案可能会解决您的强制转换错误，这是我想让您看到的，您正在将 activity 的上下文传递给 asynktask，您正在通过调用 finish() ，当您使用 activity 上下文显示吐司时，这可能会给您带来错误。因此，请确保您提供了有效的上下文，例如：-.

getApplicationContext()

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

E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1 ERROR for Android

android

android-asynctask

android-sqlite

android-studio

android-sql