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

Question

我的代码如下。它在Android Studio中给出了一个错误。任何人请帮助我。我的PHP代码没问题，但为什么会给出此错误？

注册.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();

}
}

我的背景.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" />

安卓工作室错误是：

E/Android运行时：致命异常：异步任务 #1 进程： com.example.smtanverhossain.myphpmysqlapplication， PID： 5445 java.lang.RuntimeException：执行 doInBackground(( 时出错 at android.os.AsyncTask$3.done(AsyncTask.java：300( at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java：355( at java.util.concurrent.FutureTask.setException(FutureTask.java：222( at java.util.concurrent.FutureTask.run(FutureTask.java：242( at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java：231( at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java：1112( at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java：587( at java.lang.Thread.run(Thread.java：818( 原因：java.lang.ClassCastException： com.android.okhttp.internal.http.HttpURLConnectionImpl 无法强制转换 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$2.call(AsyncTask.java：288( at java.util.concurrent.FutureTask.run(FutureTask.java：237( at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java：231( at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java：1112( at java.util.concurrent.ThreadPoolExecutor$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

这意味着您无法在此行投射到HttpsURLConnection：

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

这样做的原因是您的 URL 使用HTTP而不是HTTPS.当您使用HTTP调用url.openConnection()时，它会返回一个HttpURLConnection，同样适用于HTTPS。这在文档中有说明。

解决方案应该是用HttpURLConnection替换所有HttpsURLConnection并移除石膏以HttpsURLConnection。

Answer 2

@Tohu的解决方案可能会解决您的转换错误，我想让您看到的东西，您正在将活动的上下文传递给 asynktask，您正在通过调用finish()来破坏，这可能会在您使用活动上下文显示 toast 时给您一个错误。 因此，请确保您提供有效的上下文，例如：-。

getApplicationContext()