setContentView()中的问题当我运行应用程序时，它不起作用

Question

package com.example.uberapp;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.AppCompatTextView;
import android.content.Context;
import android.os.Bundle;
import uk.co.chrisjenx.calligraphy.CalligraphyConfig;
import uk.co.chrisjenx.calligraphy.CalligraphyContextWrapper;
public class MainActivity extends AppCompatActivity {

@Override
protected void attachBaseContext(Context newBase) {
super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

CalligraphyConfig.initDefault(new CalligraphyConfig.Builder()
.setDefaultFontPath("fonts/Arkhip_font.ttf")
.addCustomStyle(AppCompatTextView.class,android.R.attr.textViewStyle)
.setFontAttrId(R.attr.fontPath)
.build());
setContentView(R.activity_main);

}
}

Answer 1

尝试

setContentView(R.layout.activity_main);

这是正确的layout声明(R.layout前缀(