Can not assign string data from arraylist to textview

Question

I have an ArrayList in my mainActivity which stores String data. After declaring the ArrayList data are inserted from a database to the ArrayList. then when user clicks any element on ListView. I am trying to get data from the ArrayList using index value. Below is the code I am using.

ArrayList<String> list = new ArrayList<String>();
list.add("rice");
list.add("wheat");

Then I try to get data like

String data=list.get(0);
mtTextView.setText(data); //error is shown on this line

Where is the error and why I am getting the error. I cant find any wrong with the code

I followed below thread

assign arraylist value to textview

It tells to convert to string (as they had int value) but already i have string variable.

The only problem in the above code could be that mtTextView is not properly initialized or the list has null elements. Provide more code or add dummy values to setText to validate further. — thepace
– thepace, Commented Jan 20, 2016 at 9:15

Phillip Kigenyi · Accepted Answer · 2016-01-20 09:29:21Z

Make sure you initialise every thing properly. This is my code.

MainActivity.class

public class MainActivity extends AppCompatActivity {

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

        TextView textview = (TextView) findViewById(R.id.text);

        ArrayList<String> list = new ArrayList<String>();
        list.add("rice");
        list.add("wheat");

        String data=list.get(0);
        textview.setText(data);
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.codephillip.intmain.cpgenerator.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/text"
        android:text="Hello World!"/>
</RelativeLayout>

Muhammad Younas · Accepted Answer · 2016-01-20 09:20:48Z

0

TextView mtTextView= (TextView) findViewById(R.id.textview);
String data=list.get(0);
mtTextView.setText(data);

answered Jan 20, 2016 at 9:20

Muhammad Younas

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