Caused By NullPointerException

Question

Here is my code:-

 package com.example.covid19;

    import androidx.annotation.NonNull;
    import androidx.appcompat.app.AppCompatActivity;



    import android.content.Intent;
    import android.os.Bundle;
    import android.view.MenuItem;
    import android.widget.TextView;

    public class DetailActivity extends AppCompatActivity {

        private int positonCountry;
        TextView tvCountry,tvCases,tvRecovered,tvCritical,tvActive,tvTodayCases,tvTotalDeaths,tvTodayDeaths;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_detail);

            Intent intent= getIntent();
            positonCountry=intent.getIntExtra("position",0);


            getSupportActionBar().setTitle("Details of "+AffectedCountires.countryModelList.get(positonCountry).getCountry() );
            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
            getSupportActionBar().setDisplayShowHomeEnabled(true);


            tvCases=findViewById(R.id.tvtotalCases);
            tvActive=findViewById(R.id.tvActive);
            tvCountry=findViewById(R.id.tvCountry);
            tvCritical=findViewById(R.id.tvCritical);
            tvRecovered=findViewById(R.id.tvRecovered);
            tvTodayCases=findViewById(R.id.tvtodayCases);
            tvTodayDeaths=findViewById(R.id.tvTodayDeath);
            tvTotalDeaths=findViewById(R.id.tvtotalDeaths);


            tvCountry.setText(AffectedCountires.countryModelList.get(positonCountry).getCountry());
            tvCases.setText(AffectedCountires.countryModelList.get(positonCountry).getCases());
            tvActive.setText(AffectedCountires.countryModelList.get(positonCountry).getActive());
            tvCritical.setText(AffectedCountires.countryModelList.get(positonCountry).getCritical());
            tvRecovered.setText(AffectedCountires.countryModelList.get(positonCountry).getRecovered());
            tvTodayDeaths.setText(AffectedCountires.countryModelList.get(positonCountry).getTodaysDeaths());
            tvTodayCases.setText(AffectedCountires.countryModelList.get(positonCountry).getTodayCases());
            tvTotalDeaths.setText(AffectedCountires.countryModelList.get(positonCountry).getDeaths());
    enter code here





        }

        @Override
        public boolean onOptionsItemSelected(@NonNull MenuItem item) {
            if(item.getItemId()==android.R.id.home)
                finish();
            return super.onOptionsItemSelected(item);
        }
    }

Cause of the error:- Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference at com.example.covid19.DetailActivity.onCreate(DetailActivity.java:41)

The Error is in line which is in Bold

Your one of textView's Id is not matched with actual id given in layout. So at the time of setText textview is null and throwing nullPointerException — Sumit Jain, Jun 07 '20 at 03:03

score 0 · Answer 1 · answered Jun 07 '20 at 03:24

In your case,when you set text to TextView, there are less possibility are text may be null. To prevent this, you have 2 solutions.

Check value is null or not before set text to textView
This case for you, You can write in this way,

textView.setText(value+"");

Caused By NullPointerException

1 Answers1