Autosizing TextView in Android - Software Development PDF Download

• Autosizing TextView in Android

  Last Updated : 15 Aug, 2022

  If a user inputs text that exceeds the screen size in an Android app, the TextView should gradually decrease in font size to accommodate the text. This article explores how developers can implement this feature to dynamically adjust the TextView size based on user input. Refer to the GIF below for a visual representation of the end result. Sample code is provided in both Java and Kotlin for Android development.

• TextView

  This section covers the implementation of autosizing TextView in Android using a dial pad as an example. The technique showcased can be applied in various scenarios such as building calculators where dynamic TextView resizing is necessary.

  

Step by Step Implementation

Step 1: Creating a New Project in Android Studio

• Create a fresh project in Android Studio by following the instructions outlined in an article on creating new projects. Modify the application name to 'Auto resize TextView', designate the layout as 'activity_main.xml', and pick either Java or Kotlin as the programming language.

Step 2: Dealing with the XML Files

• To exemplify auto-resizing of a TextView using a dial pad, insert the provided code snippet into the 'activity_main.xml' file to structure the user interface in a manner resembling a dial pad.

• <LinearLayout 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" android:orientation="vertical" tools:context=".MainActivity" >

  <TextView android:id="@id/primaryTextView" android:layout_width="match_parent" android:layout_height="100dp" android:hint="0" android:maxLines="2" app:autoSizeMaxTextSize="80sp" app:autoSizeMinTextSize="10sp" app:autoSizeStepGranularity="2sp" app:autoSizeTextType="uniform" />

  <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:orientation="horizontal" android:weightSum="3" >

  <Button android:layout_width="68dp" android:layout_height="68dp" android:layout_margin="8dp" android:onClick="clickedOne" android:text="1" android:textSize="24sp" />

Within the aforementioned code, one can observe attributes of the TextView such as 'app:autoSizeMaxTextSize="80sp"', representing the initial text sizes of the TextView.

AutoSizing TextView in Android

AutoSizing TextView in Android allows dynamic text resizing for better readability and user experience.

Attributes for AutoSizing TextView

• app:autoSizeMaxTextSize: Sets the maximum text size that the TextView can resize up to (e.g., 80sp).
• app:autoSizeMinTextSize: Specifies the minimum text size for the TextView (e.g., 10sp).
• app:autoSizeStepGranularity: Defines the step size for text resizing (e.g., 2sp).
• app:autoSizeTextType: Determines the text resizing type, with 'uniform' option for uniform resizing.

Recommendations for Usage

It's important not to set the height and width of the TextView as wrap_content to ensure proper auto-resizing. To disable auto-resizing, set the attribute to none.

Output Example

Working with the MainActivity File

In the MainActivity File, onClick functions for each Button are handled individually to set the TextView accordingly.

Java and Kotlin Implementation

• Java
• Kotlin

Android Development Notes

• Activity Lifecycle

  • An activity has a lifecycle managed by the system.
  • It goes through states like onCreate, onStart, onResume, onPause, onStop, onDestroy, etc.
  • For example, onCreate is where the UI is initialized.

• Views and ViewGroups

  • Views are UI components like TextView, EditText, Button.
  • ViewGroups are containers like LinearLayout, RelativeLayout, which hold Views.
  • For instance, a LinearLayout can arrange Views horizontally or vertically.

Output: Run on Emulator

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