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Michael Hill
Michael Hill

Create a Float Text Progress Bar for Android with this Simple Guide


How to Create a Custom Progress Bar in Android




If you are developing an Android app that involves loading data or performing some tasks in the background, you might want to use a progress bar to show the user the status of the operation. A progress bar is a graphical element that displays the progress of a task or process, usually as a horizontal or circular bar that fills up as the task progresses. In this article, you will learn what a progress bar is, why you should use it in your Android app, how to use the default progress bar provided by Android, and how to create your own custom progress bar with different styles and effects.




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What is a Progress Bar and Why Use It?




Definition and Function of a Progress Bar




A progress bar is a visual indicator that shows the user how much of a task or process has been completed, how much is left, and how long it will take. A progress bar can be either determinate or indeterminate, depending on whether the duration or amount of work is known or not. A determinate progress bar shows a specific percentage or value of completion, while an indeterminate progress bar shows a generic animation that indicates that something is happening, but does not provide any information about the progress.


Benefits of Using a Progress Bar in Android Apps




Using a progress bar in your Android app can provide several benefits for both you and your users, such as:



  • It can improve the user experience by providing feedback and reducing uncertainty about the status of the operation.



  • It can increase user engagement and retention by creating a sense of anticipation and achievement.



  • It can prevent user frustration and confusion by avoiding long waits or unresponsive screens.



  • It can enhance the design and aesthetics of your app by adding some animation and color.



How to Use the Default Progress Bar in Android




Types and Styles of the Default Progress Bar




Android provides a default ProgressBar class that you can use to display a progress bar in your app. The ProgressBar class supports two types of progress bars: horizontal and circular. The horizontal progress bar is a linear bar that fills up from left to right, while the circular progress bar is a spinning wheel that rotates indefinitely. You can also choose from different styles of the default progress bar, such as large, small, inverse, or secondary.


How to Add and Customize the Default Progress Bar in XML and Java




To add a default progress bar to your app, you need to declare it in your layout XML file and assign it an ID. For example, to add a large circular progress bar, you can use the following code:


<ProgressBar android:id="@+id/progressBarLarge" style="?android:attr/progressBarStyleLarge" android:layout_width="wrap_content" android:layout_height="wrap_content" />


To customize the default progress bar, you can use various attributes in XML or methods in Java. For example, you can change the color, size, visibility, or indeterminate state of the progress bar. You can also set or get the current progress value, maximum value, or secondary value of the progress bar. For example, to set the color of the progress bar to red in XML, you can use the following code:


<ProgressBar android:id="@+id/progressBarLarge" style="?android:attr/progressBarStyleLarge" android:layout_width="wrap_content" android:layout_height="wrap_content" android:indeterminateTint="@color/red" />


To set the progress value of the progress bar to 50% in Java, you can use the following code:


ProgressBar progressBarLarge = findViewById(R.id.progressBarLarge); progressBarLarge.setProgress(50);


How to Create a Custom Progress Bar in Android




If you want to create a custom progress bar that has a different shape, color, or animation than the default one, you have three options: using an image or icon as the indeterminate drawable, using a layer list to define the background and progress drawable, or using a custom view to draw the progress bar programmatically.


How to Use an Image or Icon as the Indeterminate Drawable




If you want to use an image or icon as the indeterminate drawable of your progress bar, you need to create a drawable XML file that references your image or icon file. For example, if you have an image file named progress_bar_image.png in your drawable folder, you can create a drawable XML file named progress_bar_image.xml with the following code:


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<?xml version="1.0" encoding="utf-8"?> <bitmap xmlns:android=" android:src="@drawable/progress_bar_image" />


Then, you need to set the indeterminateDrawable attribute of your progress bar to point to your drawable XML file. For example, you can use the following code:


<ProgressBar android:id="@+id/progressBarImage" style="?android:attr/progressBarStyle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:indeterminateDrawable="@drawable/progress_bar_image" />


This will create a progress bar that uses your image or icon as the indeterminate drawable, which will rotate indefinitely.


How to Use a Layer List to Define the Background and Progress Drawable




If you want to use a layer list to define the background and progress drawable of your progress bar, you need to create a drawable XML file that contains a layer-list element with two items: one for the background and one for the progress. For example, if you want to create a horizontal progress bar with a blue background and a green progress, you can create a drawable XML file named progress_bar_layer_list.xml with the following code:


<?xml version="1.0" encoding="utf-8"?> <layer-list xmlns:android=" <item> <shape android:shape="rectangle"> <solid android:color="@color/blue"/> </shape> </item> <item> <clip> <shape android:shape="rectangle"> <solid android:color="@color/green"/> </shape> </clip> </item> </layer-list>


Then, you need to set the background and progressDrawable attributes of your progress bar to point to your drawable XML file. For example, you can use the following code:


<ProgressBar android:id="@+id/progressBarLayerList" style="?android:attr/progressBarStyleHorizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/progress_bar_layer_list" android:progressDrawable="@drawable/progress_bar_layer_list" />


This will create a horizontal progress bar that uses your layer list as the background and progress drawable, which will fill up from left to right.


How to Use a Custom View to Draw the Progress Bar Programmatically




If you want to use a custom view to draw the progress bar programmatically, you need to create a subclass of View that overrides the onDraw method and the onMeasure method. The onDraw method is where you draw the progress bar using the Canvas and Paint objects, while the onMeasure method is where you specify the size and dimensions of your custom view. For example, if you want to create a circular progress bar that has a gradient color and a text showing the percentage, you can create a custom view class named ProgressBarCircle with the following code:


public class ProgressBarCircle extends View private Paint paint; private RectF rectF; private int progress; private int max; private int colorStart; private int colorEnd; private int colorText; private float tex


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