111.7. 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;
}
}