当我单击按钮保存用户信息时，应用程序只是关闭，我无法访问数据库以查看信息是否已保存。 当我评论“verifyUser(mail)”部分时，我只得到吐司作为答案，但应用程序也关闭。 我实在不知道这是什么bug。
这是我的代码
package be.heh.projet_inventaire import android.content.AsyncQueryHandler import android.content.Intent import android.os.AsyncTask import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.text.Editable import android.text.TextWatcher import android.util.Patterns import android.view.View import android.widget.Toast import androidx.activity.viewModels import be.heh.projet_inventaire.bd.MyDB import be.heh.projet_inventaire.bd.User import be.heh.projet_inventaire.bd.UserRecord import kotlinx.android.synthetic.main.activity_main.bt_Inscription_Connexion import kotlinx.android.synthetic.main.activity_main.bt_Inscription_main import kotlinx.android.synthetic.main.activity_main.et_email import kotlinx.android.synthetic.main.activity_main.et_pwd import kotlinx.android.synthetic.main.activity_main.* import java.lang.Exception class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { AsyncTask.execute {MyDB.getDatabase(this).userDao()} val viewModel: UserViewModel by viewModels() super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) et_email.addTextChangedListener(object : TextWatcher{ override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) { } override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) { } override fun afterTextChanged(s: Editable?) { mailValidator(s.toString()) } }) et_pwd.addTextChangedListener(object : TextWatcher{ override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) { } override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) { } override fun afterTextChanged(s: Editable?) { PwdValidator(s.toString()) } }) } fun xmlClickEvent(v: View) { when(v.id){ bt_Inscription_main.id -> addUser() bt_Inscription_Connexion.id -> versConnexion() } } private fun validMail(email: String): Boolean { val emailPattern = Patterns.EMAIL_ADDRESS return emailPattern.matcher(email).matches() } private fun mailValidator(email: String): Boolean { if (validMail(email)) { tvEmailError.visibility = View.GONE return true } else { tvEmailError.text = "Adresse e-mail non valide" tvEmailError.visibility = View.VISIBLE return false } } private fun PwdValidator(password: String): Boolean { if (password.length >= 4) { tvPwdError.visibility = View.GONE// //tilPwd.error = null return true } else { //tilPwd.error = "Le mot de passe doit contenir au moins 4 caractères" tvPwdError.text = "Le mot de passe doit contenir au moins 4 caractères" tvPwdError.visibility = View.VISIBLE return false } } fun verifyUser(email: String) : Boolean{ var user = UserRecord (0,"","","") AsyncTask.execute { user = MyDB.getDatabase(this).userDao().get(email) } if (user == null){return true} else(return false) } fun addUser(){ try { val mail = et_email.text.toString() val pwd = et_pwd.text.toString() if(mailValidator(mail) && PwdValidator(pwd)){ if(verifyUser(mail)) { val u = User( 0, mail, pwd ) var role = "" AsyncTask.execute{ val db = MyDB.getDatabase(this) val dao = db.userDao() val liste = dao.get() if (liste.isEmpty()) { role = "S_U" } else { role = "basic" } val u1 = UserRecord(0, u.email, u.pwd, role) dao.insertUser(u1) } Toast.makeText(this, "user créé", Toast.LENGTH_LONG).show(); } else{ tvEmailError.text = "Cet utilisateur existe déjà" tvEmailError.visibility = View.VISIBLE } } else{ tvEmailError.text = "Entrez une adresse mail valide" tvEmailError.visibility = View.VISIBLE tvPwdError.text = "Le mot de passe doit contenir au moins 4 caractères" tvPwdError.visibility = View.VISIBLE } } catch (e:Exception){ e.printStackTrace() } } fun versConnexion(){ val connexion = Intent(this,ConnexionActivity::class.java) startActivity(connexion) } }
我尝试过的：
我尝试了很多东西，但我什至不知道为什么它不起作用，所以它有点随机
解决方案1
如果没有通过 terry/catch 块中的 e.printStackTrace 方法将错误消息打印到控制台窗口，任何人都不可能告诉您出了什么问题。
解决方案2
日志：
KeyboardViewController.show():438 Requesting to show sub view with id 2131428318(key_pos_password_header_numbers) which doesn't exist in current keyboard view jyl at klb.a(PG:195) at bty.a(PG:4) at com.google.android.apps.inputmethod.latin.keyboard.LatinPasswordKeyboard.a(PG:19) at kfh.a(PG:15) at kev.a(PG:31) at kev.H(PG:26) at kez.d(PG:10) at kez.b(PG:108) at com.android.inputmethod.latin.LatinIME.b(PG:339) at dwq.onStartInputView(PG:786) at android.inputmethodservice.InputMethodService.doStartInput(InputMethodService.java:2339) at android.inputmethodservice.InputMethodService$InputMethodImpl.startInput(InputMethodService.java:620) at android.inputmethodservice.InputMethodService$InputMethodImpl.dispatchStartInputWithToken(InputMethodService.java:649) at android.inputmethodservice.IInputMethodWrapper.executeMessage(IInputMethodWrapper.java:199) at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:44) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:223) at android.app.ActivityThread.main(ActivityThread.java:7656) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
FATAL EXCEPTION: AsyncTask #2
Process: be.heh.projet_inventaire, PID: 12811
java.lang.NullPointerException: Can't toast on a thread that has not called Looper.prepare()
at com.android.internal.util.Preconditions.checkNotNull(Preconditions.java:157)
at android.widget.Toast.getLooper(Toast.java:179)
at android.widget.Toast.<init>(Toast.java:164)
at android.widget.Toast.makeText(Toast.java:492)
at android.widget.Toast.makeText(Toast.java:480)
at be.heh.projet_inventaire.MainActivity.addUser$lambda-2(MainActivity.kt:127)
at be.heh.projet_inventaire.MainActivity.$r8$lambda$BkrwyiTzOFeXUe8qS3noNnSP7sk(Unknown Source:0)
at be.heh.projet_inventaire.MainActivity$$ExternalSyntheticLambda1.run(Unknown Source:6)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:305)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:923)
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