How to display ArrayList value in TextView?

Question

I want to display a value stored in my ArrayList in my TextView so when the application is run the name appears in the TextView alongside other details.

I can read the values from the ArrayList and they display in the logcat. They also display on a ListView but I cant get them to display on the TextView.

private ArrayList<Country> countries;

    private ArrayList<Country> countries;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        lvCountries = findViewById(R.id.main_activity_lv_countries);
        tvDetails = findViewById(R.id.activity_country_details);
        lvCountries.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //create an intent for the FlagDisplayActivity
                Intent intentBundle = new Intent(MainActivity.this, FlagDisplayActivity.class);
                Bundle bundleName = new Bundle();

                //put arg2 as an extra in the intent. arg2 represents the item clicked on
                //e.g arg2 will be 0 if the first item was clicked
                intentBundle.putExtra(countries.get(position).getName(), countries.get(position).getFlagImageResourceId());
                //start the activity
                startActivityForResult(intentBundle, DELETE_REQUEST);
            }
        });

        countries = new ArrayList<>();
        countries.add(new Country("Australia", 100, "Canberra", "English", "Dollars", R.drawable.australia));
        countries.add(new Country("China", 5771876, "Beijing", "Chinese", "Renminbi", R.drawable.china));
        countries.add(new Country("Germany", 126860301, "Berlin", "German", "Euros", R.drawable.germany));
        countries.add(new Country("India", 60550075, "New Delhi", "Indian", "Rupees", R.drawable.india));
        countries.add(new Country("UK", 100, "London", "English", "GBP", R.drawable.uk));

        for (int i = 0; i < countries.size(); i++) {
            Log.d(TAG, "onCreate: name: " + countries.get(i).getName() + " Population: " + countries.get(i).getPopulation());
        }

        //Create a String ArrayList to store the country names
        ArrayList<String> countryNames = new ArrayList<>();


        //For every Country object in the countries ArrayList
        for (Country country : countries) {
            //Add the name of the country to the String ArrayList
            countryNames.add(country.getName() + " " + country.getPopulation() + " " + country.getCapitalCity() + " " + country.getLanguage() + " " + country.getCurrency() + " " + country.getFlagImageResourceId());
        }

        //Create an ArrayAdapter using the countryNames String ArrayList
        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, countryNames);
        //Set the adapter on the ListView
        lvCountries.setAdapter(adapter);

    }

Information does not display in the TextView.

Answer 1

here it is completely working code for display name and population of countries from arraylist in ListView by CustomAdapter. follow steps as listed. Already Listview lvCountries in your MainActivity.

1.Country.java

public class Country {

String name;int population; String capital,language,currentcy;
int image;

public Country(String name, int population, String capital, String language, String currentcy, int image) {
    this.name = name;
    this.population = population;
    this.capital = capital;
    this.language = language;
    this.currentcy = currentcy;
    this.image = image;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getPopulation() {
    return population;
}

public void setPopulation(int population) {
    this.population = population;
}

public String getCapital() {
    return capital;
}

public void setCapital(String capital) {
    this.capital = capital;
}

public String getLanguage() {
    return language;
}

public void setLanguage(String language) {
    this.language = language;
}

public String getCurrentcy() {
    return currentcy;
}

public void setCurrentcy(String currentcy) {
    this.currentcy = currentcy;
}

public int getImage() {
    return image;
}

public void setImage(int image) {
    this.image = image;
}
}

2. in res in layout add entity_country.xml

    <TextView android:id="@+id/lit_item_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="15sp" android:textColor="#000" /> <TextView android:id="@+id/lit_item_population" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="15sp" android:textColor="#89a"/> <TextView android:id="@+id/lit_item_capital" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="15sp" android:textColor="#f00"/> <TextView android:id="@+id/lit_item_language" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="15sp" android:textColor="#7788ff"/> <TextView android:id="@+id/lit_item_currency" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="15sp" android:textColor="#007700"/>

3. CustomAdapter.java

============ starts ======

class CustomAdapter extends BaseAdapter {

private ArrayList<Country> _data;
Context _c;

CustomAdapter(ArrayList<Country> data, Context c) {
    _data = data;
    _c = c;
    Log.d("inside customAdapter", "inside customAdapter constructor...");
}

public int getCount() {
    // TODO Auto-generated method stub
    return _data.size();
}

public Object getItem(int position) {
    // TODO Auto-generated method stub
    return _data.get(position);
}

public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}

public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    View v = convertView;
    if (v == null) {
        LayoutInflater vi = (LayoutInflater) _c
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = vi.inflate(R.layout.entity_country, null);
    }

    TextView lit_item_name = (TextView) v.findViewById(R.id.lit_item_name);
    TextView lit_item_population = (TextView) v.findViewById(R.id.lit_item_population);
    TextView lit_item_capital = (TextView) v.findViewById(R.id.lit_item_capital);
    TextView lit_item_language = (TextView) v.findViewById(R.id.lit_item_language);
    TextView lit_item_currency = (TextView) v.findViewById(R.id.lit_item_currency);
    ImageView list_item_image = (ImageView) v.findViewById(R.id.list_item_image);

    Log.d("tvcredit==>", " "+lit_item_name.getText().toString());



    final Country tpj = _data.get(position);
    lit_item_name.setText(tpj.name+"");
    lit_item_population.setText(tpj.population+"");
    lit_item_capital.setText(tpj.capital+"");
    lit_item_language.setText(tpj.language+"");
    lit_item_currency.setText(tpj.currentcy+"");

    list_item_image.setImageResource(tpj.image);

    LinearLayout ll_parent=(LinearLayout)v.findViewById(R.id.ll_parent);
    ll_parent.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(_c,tpj.name+"\n"+tpj.capital,Toast.LENGTH_LONG).show();

            //======== code as per your requirement =========
            //Intent intent=new Intent(_c,TargetActivity.class);
            //intent.putExtra("name",tpj.name+"");
            //intent.putExtra("name",tpj.capital+"");
            //_c.startActivity(intent);
        }
    });
    return v;
}}

============ ends =========

4. inside MainActivity.java in onCreate Method just write

    ListView lvCountries = (ListView)findViewById(R.id.lvCountries); ArrayList<Country> countries; countries = new ArrayList<>(); countries.add(new Country("Australia", 100, "Canberra", "English", "Dollars", R.drawable.australia)); countries.add(new Country("China", 5771876, "Beijing", "Chinese", "Renminbi", R.drawable.china)); countries.add(new Country("Germany", 126860301, "Berlin", "German", "Euros", R.drawable.germany)); countries.add(new Country("India", 60550075, "New Delhi", "Indian", "Rupees", R.drawable.india)); countries.add(new Country("UK", 100, "London", "English", "GBP", R.drawable.uk)); CustomAdapter customAdapter=new CustomAdapter(countries,getApplicationContext()); lvCountries.setAdapter(customAdapter);

i have checked it, sure it will be helpful for you.