Android TextView

Widgets are user interface (UI) elements that help users to interact with Android applications. It is one of many equipments that can be used to improvise the user interface of your application. TextView refers to a widget that displays text on the screen according to the layout, size, color, etc. set in a specific TextView. You can modify or edit the options themselves.

Structure:

public class TextView
  extends View 
  implements ViewTreeObserver.OnPreDrawListener

Class Hierarchy:

java.lang.Object
android.view.View
android.widget.TextView

Syntax:

<Any_Layout>
    .
    .
<TextView>
        android:Attribute1 = " attribute1 value"
        android:Attribute2 = "attribute2 value"
.
        android:AttributeN = "attributeN value"
</TextView>
    .
    .
</Any_Layout>

The layout here can be any layout such as Constraint, Relative, Linear, etc. (For more information on layout, see the article on Basic Layouts). Additionally, this documentcontainsinformation about a number of attributes in the table.

Example:

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ExampleActivity3">
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="Text View Example"
android:textColor="#151515"
android:textSize="30sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.482"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

Steps for including a TextView in an Android Application:

1. The first will be to create a new Android project or open an existing project to edit it in the Android Studio. Under any scenario, there must be an activity java class file and an XML layout activity file linked to the class.

2. Open the activity layout file and inserta textview in the layout.

3. Now in the SecondActivity.java file, connect theXML layout file as follows:

@Override
protected void onCreate(Bundle savedInstanceState)
    {
super.onCreate(savedInstanceState);


setContentView(R.layout.activity_second);
//activity_second is the name of the XML layout file to be displayed.
}

4. Let’s change the Text displayed in the TextView and show a toast when clicked.

5. The XML layout file and the Java file codesare as follows:

activity_second.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SecondActivity">
<TextView
android:id ="@+id/id1"
android:layout_width ="wrap_content"
android:layout_height ="wrap_content"
android:text ="Welcome To"
android:textSize ="26sp"
android:textStyle ="bold"
android:textColor ="@color/teal_200"
app:layout_constraintBottom_toBottomOf ="parent"
app:layout_constraintLeft_toLeftOf ="parent"
app:layout_constraintRight_toRightOf ="parent"
app:layout_constraintTop_toTopOf ="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

SecondActivity.java

import androidx.appcompat.app.AppCompatActivity;
import android.widget.TextView;
import android.widget.Toast;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;


public class SecondActivity extends AppCompatActivity {


// Creating the object
publicTextView txt;


@Override
protected void onCreate(Bundle savedInstanceState)
    {
super.onCreate(savedInstanceState);


setContentView(R.layout.activity_second);
txt= findViewById(R.id.id1);


// Changing the text of the Textview upon click
        // and also show a Toast message
txt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view)
            {
// Setting new text
txt.setText("Paradise");
// Showing Toast
Toast
.makeText(SecondActivity.this,
"Welcome to Paradise",
Toast.LENGTH_SHORT)
                        .show();
            }
        });
    }
}

Attributes of TextView