I don't know whats the problem.but it shows me "cannont resolve method 'findviewbyid(int)'".here is my code tell me how to fix it

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package com.example.afinal;

import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.widget.TextView;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.util.concurrent.TimeUnit;

/**
 * Created by admin on 13/07/2017.
 */

public class Tab1 extends Fragment {
    TextView textView;
    TextView label1;
    String  strDate;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy/dd/MM");

        Date day = new Date();
        strDate=sdf.format(new Date(day.getTime() - TimeUnit.DAYS.toMillis(1)));
        textView =(TextView)findViewById(R.id.textView);
        textView.setText(strDate);
        return inflater.inflate(R.layout.tab1,container,false);

        //  textView.setText(new Date().toString());
    }
}

What I have tried:

I tried using getView() method before findviewById(int).My app crashed after using that method.Am an beginner in android.Help me out Guys.

Posted 12-Jul-17 23:25pm

Bala Milka

Updated 12-Jul-17 23:57pm

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Afzaal Ahmad Zeeshan · Accepted Answer · 2017-07-12T23:57:00

Several things to understand here, first of all you are using findViewById, but in the Fragment derived class, secondly you are using it in the onCreateView() function. These are not allowed and you need to wait and call it from a later function (any other handler). A quick hack (and a bad practice) would be to think that you can just inflate a new view and capture the objects from there, just don't do that.

The best approach would be to call it any other function, such as onStart() function or any other function that gets executed when your View is shown to the user. It won't be a bad practice to show a "Loading..." to the user.

Java

public void onStart() {
    super.onStart(); // Call this here. 
    // Get it here.
    TextView textView = (TextView) getView().findViewById(R.id.textView);
}

Notice the fact that onViewCreated() function is never guaranteed to be called thus this function would be useful. For more, you should consider reading the Fragment[^] class reference to understand how functions get called — events get raised.

android - findViewById in Fragment - Stack Overflow[^]