java - 显示错误消息的代码 :- error: incompatible types: Schedule_fragment cannot be converted to Fragment

Question

向分段 Activity 添加时钟时显示上列错误的代码。 显示的错误消息是 - 错误:不兼容的类型:Schedule_fragment 无法转换为 Fragment。 我对此很陌生，并且从 YouTube 教程中编写了此代码，现在尝试与我的代码合并。请帮忙。

package com.example.fastfill.ui.main;   
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.DialogFragment;
import androidx.fragment.app.Fragment;  
import com.example.fastfill.R;


public class Schedule_fragment extends Fragment implements TimePickerFragment.TimePickerListener {
    private TextView displaytime;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.schedule_fragment);
        displaytime=findViewById(R.id.displaytime);
        Button showtime=findViewById(R.id.showtime);
        showtime.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view){
                DialogFragment timePickerFragment=new TimePickerFragment();
                timePickerFragment.show(getSupportFragmentManager(),"timePicker");
            }
        });
    }
    @Override
    public void onTimeSet(TimePicker timePicker, int hour, int minute) {
        displaytime.setText("Hour = " +hour + "Minute = "+ minute);
    }
}

Answer 1

您正在扩展AppCompatActivity，如果您想使用Schedule_fragment作为fragment，则需要扩展Fragment。