java코드입니다.
package com.codesample.shokudou;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import com.codesample.shokudou.databinding.ActivityMainBinding;
public abstract class MainActivity extends AppCompatActivity implements View.OnClickListener {
private ActivityMainBinding binding;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding=ActivityMainBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
widgets();
}
private void widgets(){
binding.buttonMenu.setOnClickListener(this);
binding.buttonLocation.setOnClickListener(this);
binding.buttonEvent.setOnClickListener(this);
}
@Override
public void onClick(View v){
int id = v.getId();
if(id == R.id.buttonMenu){
binding.menuScrollView.setVisibility(View.VISIBLE);
binding.locationScrollView.setVisibility(View.INVISIBLE);
binding.eventScrollView.setVisibility(View.INVISIBLE);
} else if(id == R.id.buttonLocation){
binding.menuScrollView.setVisibility(View.INVISIBLE);
binding.locationScrollView.setVisibility(View.VISIBLE);
binding.eventScrollView.setVisibility(View.INVISIBLE);
} else if(id == R.id.buttonEvent){
binding.menuScrollView.setVisibility(View.INVISIBLE);
binding.locationScrollView.setVisibility(View.INVISIBLE);
binding.eventScrollView.setVisibility(View.VISIBLE);
}
}
}
logcat에 나오는 오류들입니다...
2020-04-05 21:37:56.477 13825-13825/com.codesample.shokudou E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.codesample.shokudou, PID: 13825
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.codesample.shokudou/com.codesample.shokudou.MainActivity}: java.lang.InstantiationException: java.lang.Class<com.codesample.shokudou.MainActivity> cannot be instantiated
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2843)
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.InstantiationException: java.lang.Class<com.codesample.shokudou.MainActivity> cannot be instantiated
at java.lang.Class.newInstance(Native Method)
at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:69)
at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:41)
at android.app.Instrumentation.newActivity(Instrumentation.java:1215)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2831)
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)
현재 앱을 실행하면 계속 중단됨 이라고 뜨면서 앱 실행이 되지 않습니다.
제가 입문자라서 코드상에서 오류는 뜨지 않아서..
어디서 틀린건지를 잘 모르겠네요ㅠㅠ...
