php - 通过 Android Studio 使用 MySQL 数据库登录应用程序

Question

正如标题所说，我试图通过从 MySQL 数据库获取用户名和密码来制作我的第一个具有简单登录功能的 Android 应用程序，但我在 logcat 中收到以下错误，并且当我单击时我的应用程序崩溃在登录按钮上

01-27 12:35:11.787 2509-2525/? E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #2
Process: com.example.klm.sql, PID: 2509
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:309)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)

Caused by: 
java.lang.ClassCastException: com.android.okhttp.internal.huc.HttpURLConnectionImpl cannot be cast to javax.net.ssl.HttpsURLConnection
at com.example.klm.sql.Background.doInBackground(Background.java:39)
at com.example.klm.sql.Background.doInBackground(Background.java:23)
at android.os.AsyncTask$2.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
at java.lang.Thread.run(Thread.java:818) 

有人可以告诉我这些错误是什么意思吗？我该如何解决它？

Answer 1

好的，我明白了。我所要做的就是改变:

String login_url = "http://10.0.2.2/login.php"; 

致:

String login_url = "https://10.0.2.2/login.php";