Android Textview Edittext Button Imageview Complete Guide

 Last Update:2025-06-23T00:00:00     .NET School AI Teacher - SELECT ANY TEXT TO EXPLANATION.    7 mins read      Difficulty-Level: beginner

Understanding the Core Concepts of Android TextView, EditText, Button, ImageView

Android TextView, EditText, Button, ImageView: Details and Important Information

TextView

Key Attributes:

  • android:text: Sets the text in the TextView.
  • android:textSize: Defines the size of the text.
  • android:textColor: Specifies the color of the text.
  • android:typeface: Allows you to specify the typeface (e.g., normal, sans, serif).
  • android:fontFamily: Sets the font family to use for this TextView.
  • android:gravity: Aligns the text within its container.
  • android:maxLines: Limits the number of lines the text can occupy.
  • android:ellipsize: Defines how long text should be truncated. Common values are start, middle, end, and marquee.

Use Cases:

  • Displaying static information such as labels or brief descriptions.
  • Showing user-generated content in a read-only form.
  • Implementing text-based counters or timers.

Example:

<TextView
    android:id="@+id/myTextView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="This is a TextView example."
    android:textSize="16sp"
    android:textColor="#FF0000"
    android:gravity="center" />

EditText

Definition: The EditText widget provides a user interface for text input. You can configure it with various input filters, typefaces, and other properties to accept specific types of data.

Key Attributes:

  • android:hint: Provides a hint for the input field (this will appear until the user starts typing).
  • android:inputType: Specifies the keyboard and input method type. Examples include text, phone, number, emailAddress, etc.
  • android:maxLength: Sets the maximum number of characters that can be entered.
  • android:text: Defines the default text in the EditText.
  • android:gravity: Sets the alignment of the text within the input field.
  • android:singleLine: Whether the EditText is a single line text entry.
  • android:background: Customize the background appearance of the input field.

Use Cases:

  • Collecting user inputs like names, passwords, phone numbers, and email addresses.
  • Implementing multi-line text input fields for detailed notes or descriptions.
  • Creating search bars for filtering lists or performing searches.

Example:

<EditText
    android:id="@+id/myEditText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="Type something here..."
    android:inputType="textEmailAddress"
    android:maxLength="50" />

Button

Definition: A Button widget is used to create clickable buttons within an app. Users can tap on these buttons to initiate actions or navigate between different screens.

Key Attributes:

  • android:text: Sets the text displayed on the button.
  • android:textSize: Defines the size of the button text.
  • android:textColor: Sets the color of the button text.
  • android:drawableLeft, android:drawableRight, etc.: Includes drawable images on the left/right of the text.
  • android:background: Customizes the background of the button.
  • android:onClick: Specifies the name of a listener method called when a click event occurs on the button.

Use Cases:

  • Initiating actions such as submitting a form, starting a process, or making a selection.
  • Navigating between app screens or activities.
  • Enabling/disabling features or settings.

Example:

<Button
    android:id="@+id/myButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Click Me!"
    android:textSize="18sp"
    android:textColor="#FFFFFF"
    android:background="#FF9900"
    android:onClick="onButtonClick" />

In the corresponding activity, you define the onButtonClick method:

public void onButtonClick(View view) {
    // Your logic here
}

ImageView

Definition: The ImageView widget displays an image resource, which can be static or animated. It is commonly used to display app logos, icons, or graphical elements.

Key Attributes:

  • android:src: Specifies the drawable resource to use as the image source.
  • android:contentDescription: Provides a textual description of the image, typically for accessibility purposes.
  • android:scaleType: Controls how the image is resized and aligned to fit within the ImageView. Options include fitXY, centerCrop, centerInside, etc.
  • android:tint: Applies a color tint to the image.
  • android:maxWidth, android:maxHeight: Set the maximum width and height for the ImageView.

Use Cases:

  • Displaying application logo or icon.
  • Show images downloaded from the internet or stored locally.
  • Enhance the visual appeal by integrating graphics with UI components.

Example:

<ImageView
    android:id="@+id/myImageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/my_image"
    android:contentDescription="My Image"
    android:scaleType="centerCrop"
    android:maxWidth="200dp"
    android:maxHeight="200dp" />

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Step-by-Step Guide: How to Implement Android TextView, EditText, Button, ImageView

Overview

The application will include:

  1. An ImageView to display an image.
  2. A TextView to display a message.
  3. An EditText for the user to input text.
  4. A Button to trigger an action that will display the text from the EditText in the TextView.

Step 1: Set Up Your Android Project

  1. Open Android Studio and create a new project.
  2. Choose "Empty Activity" and click Next.
  3. Name your application (e.g., TextViewEditTextButtonImageViewApp), choose a package name, and set the language to Java or Kotlin as per your preference. Here, we'll use Java.
  4. Make sure the minimum API level is set to a level that’s compatible with all the features we’ll use (API 21 or above is recommended).
  5. Click "Finish" to create the project.

Step 2: Modify the Layout File

We will modify the default activity_main.xml layout file to add TextView, EditText, Button, and ImageView components.

activity_main.xml

Open res/layout/activity_main.xml and add the following code:

<?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:padding="16dp"
    tools:context=".MainActivity">

    <!-- ImageView -->
    <ImageView
        android:id="@+id/imageView"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_centerHorizontal="true"
        android:src="@drawable/ic_launcher_background" />

    <!-- TextView -->
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/imageView"
        android:layout_marginTop="16dp"
        android:layout_centerHorizontal="true"
        android:text="Enter some text and click the button!"
        android:textSize="18sp"
        android:textStyle="bold" />

    <!-- EditText -->
    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/textView"
        android:layout_marginTop="16dp"
        android:hint="Type something here!" />

    <!-- Button -->
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/editText"
        android:layout_marginTop="16dp"
        android:layout_centerHorizontal="true"
        android:text="Show Text" />

</RelativeLayout>

Step 3: Modify the MainActivity File

We will now write some logic in the MainActivity.java (or MainActivity.kt if using Kotlin) file to handle the button click event and update the TextView based on the user's input in the EditText.

MainActivity.java

Open src/main/java/com/example/textviewedittextbuttonimageviewapp/MainActivity.java and add the following code:

package com.example.textviewedittextbuttonimageviewapp;

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

public class MainActivity extends AppCompatActivity {

    private EditText editText;
    private TextView textView;
    private Button button;

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

        // Initialize the views
        editText = findViewById(R.id.editText);
        textView = findViewById(R.id.textView);
        button = findViewById(R.id.button);

        // Set up the button click listener
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Get the text from the EditText
                String inputText = editText.getText().toString();
                // Set the text of the TextView
                textView.setText(inputText);
            }
        });
    }
}

This code sets up the views by finding them in the layout, and then sets an OnClickListener on the Button. When the Button is clicked, it retrieves the text from the EditText and sets it to the TextView.

Step 4: Run the Application

  1. Click the "Run" button in Android Studio.
  2. Select a virtual device or a physical device.
  3. If everything is set up correctly, the application will be installed and launched on the device/emulator.

Step 5: Test the Application

  • Type some text into the EditText.
  • Click the Button.
  • The TextView should update to display the text you entered in the EditText.

Conclusion

This simple application demonstrates the basic usage of TextView, EditText, Button, and ImageView in Android. You can expand upon this by adding more features or using additional components. Happy coding!

If you're using Kotlin, here's the equivalent MainActivity.kt:

MainActivity.kt

Top 10 Interview Questions & Answers on Android TextView, EditText, Button, ImageView

Top 10 Questions and Answers: Android TextView, EditText, Button, ImageView

A TextView widget is used to display text to the user. It is commonly used for displaying static text or dynamic text that can be updated at runtime. To set text programmatically, you can use the setText() method. Here is an example:

TextView myTextView = findViewById(R.id.my_text_view);
myTextView.setText("Hello, World!");

2. How can you make the text in a TextView selectable?

To make text selectable in a TextView, you need to set the android:textIsSelectable attribute to true in your XML layout file or use the method setTextIsSelectable(true) in your Java/Kotlin code.

XML:

<TextView
    android:id="@+id/my_text_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Select this text"
    android:textIsSelectable="true"/>

Java:

TextView myTextView = findViewById(R.id.my_text_view);
myTextView.setTextIsSelectable(true);

3. What is the difference between TextView and EditText in Android?

  • TextView: This widget is used to display text to the user. The text in a TextView is not editable.
  • EditText: This widget is used to accept text input from the user. The text in an EditText is editable.

Example usage:

<TextView
    android:id="@+id/my_text_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Read-only text"/>

<EditText
    android:id="@+id/my_edit_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

4. How can you change the font style, size, and color of a TextView?

You can change the font style, size, and color of a TextView using the android:textColor, android:textSize, and android:typeface attributes in XML, or programmatically by using the setTextColor(), setTextSize(), setTypeface() methods in Java/Kotlin.

XML:

<TextView
    android:id="@+id/my_text_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Styled Text"
    android:textColor="#FF0000"
    android:textSize="20sp"
    android:typeface="serif"/>

Java:

TextView myTextView = findViewById(R.id.my_text_view);
myTextView.setTextColor(Color.RED);
myTextView.setTextSize(20);
myTextView.setTypeface(Typeface.SERIF);

5. How do you handle button clicks in Android?

To handle button clicks, you should set an OnClickListener to the Button. This can be done in Java/Kotlin code or directly via XML attributes.

Java:

Button myButton = findViewById(R.id.my_button);
myButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Toast.makeText(MainActivity.this, "Button Clicked", Toast.LENGTH_SHORT).show();
    }
});

Kotlin:

val myButton: Button = findViewById(R.id.my_button)
myButton.setOnClickListener {
    Toast.makeText(this, "Button Clicked", Toast.LENGTH_SHORT).show()
}

6. Can you set an image to a Button in Android?

Yes, you can set an image to a Button using the android:drawableStart, android:drawableTop, android:drawableEnd, or android:drawableBottom attributes in XML, or by using the setCompoundDrawablesWithIntrinsicBounds() method in Java/Kotlin.

XML:

<Button
    android:id="@+id/my_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Click Me"
    android:drawableStart="@drawable/ic_launcher_foreground"/>

Java:

Button myButton = findViewById(R.id.my_button);
myButton.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_launcher_foreground, 0, 0, 0);

7. How to validate user input in EditText?

To validate user input in an EditText, you can get the text from the EditText and check it against your validation criteria. For example, to ensure that the user enters an email address, you can use the Patterns.EMAIL_ADDRESS pattern.

Java:

EditText myEditText = findViewById(R.id.my_edit_text);
String input = myEditText.getText().toString();
if (Patterns.EMAIL_ADDRESS.matcher(input).matches()) {
    // Valid email
} else {
    // Invalid email
}

8. How do you update the visibility of a View in Android?

To update the visibility of a View, you can use the setVisibility() method with one of these constants: View.VISIBLE, View.INVISIBLE, or View.GONE.

Java:

TextView myTextView = findViewById(R.id.my_text_view);
myTextView.setVisibility(View.GONE); // Hide the TextView

9. How to set and handle click events on an ImageView in Android?

You can set an image to an ImageView using the android:src attribute in XML or programmatically, and then handle click events by setting an OnClickListener.

XML:

<ImageView
    android:id="@+id/my_image_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_launcher_foreground"/>

Java:

ImageView myImageView = findViewById(R.id.my_image_view);
myImageView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // Handle image click
    }
});

10. How to set a background image for a TextView using programmatically in Android?

To set a background image for a TextView programmatically, you can use the setBackgroundResource() method.

Java:

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