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114.7. Fragment 中调用 findViewById

			
package cn.netkiller.album;

import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.fragment.app.Fragment;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link ClockFragment#newInstance} factory method to
 * create an instance of this fragment.
 */
public class ClockFragment extends Fragment {
    private static final String TAG = ClockFragment.class.getSimpleName();
    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    public ClockFragment() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment ClockFragment.
     */
    // TODO: Rename and change types and number of parameters
    public static ClockFragment newInstance(String param1, String param2) {
        ClockFragment fragment = new ClockFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_clock, container, false);
        TextView textViewDate = view.findViewById(R.id.textViewDate);

        Handler handler = new Handler();
        handler.postDelayed(() -> {
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("M月d日 EEEE", Locale.CHINESE);
            String date = simpleDateFormat.format(new Date());
            textViewDate.setText(date);
            Log.d(TAG, date);
        }, 30000);

        return view;
    }
}