안드로이드 스튜디오 로그인/회원가입 오류

Question

 

Debug

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.geuriro, PID: 571
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.geuriro/com.example.geuriro.LoginActivity}: java.lang.ClassCastException: androidx.appcompat.widget.AppCompatImageView cannot be cast to android.widget.EditText
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: java.lang.ClassCastException: androidx.appcompat.widget.AppCompatImageView cannot be cast to android.widget.EditText
        at com.example.geuriro.LoginActivity.onCreate(LoginActivity.java:38)
        at android.app.Activity.performCreate(Activity.java:7136)
        at android.app.Activity.performCreate(Activity.java:7127)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:193) 
        at android.app.ActivityThread.main(ActivityThread.java:6669) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 

Answer 1

에러 메세지를 잘 읽어보세요. 거기에 힌트가 있습니다.

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.geuriro/com.example.geuriro.LoginActivity}: java.lang.ClassCastException: androidx.appcompat.widget.AppCompatImageView cannot be cast to android.widget.EditText

LoginActivity에서,  AppCompatImageView( = ImageView)를 EditText로 형변환할 수 없다는 의미입니다.  레이아웃에는 ImageView로 정의되어 있고 코드에서는 EditText로 사용하고 있는 부분을 찾아 정확한 타입을 사용하도록 하시면 될 듯.