Custom Progress Bar in Android

The ProgressBar class contains an attribute indeterminateDrawable which replaces the default indicator with the drawable specified. Let’s see what happens when we place an icon in the ProgressBar. The code for activity_main.xml looks like this:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="https://schemas.android.com/apk/res/android"
    xmlns:app="https://schemas.android.com/apk/res-auto"
    xmlns:tools="https://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.journaldev.spinninglogo.MainActivity">

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:indeterminateDrawable="@mipmap/ic_launcher"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

The output that the above layout reflects in our application is given below. Oops! What’s wrong with the ProgressBar? Why isn’t it rotating? Well we need to set a RotateDrawable as the value of the attribute. A RotateDrawable is defined in the xml by encapsulating the current drawable and assigning it the angle and degrees of rotation. The tag <rotate> is used to do so in the xml as shown below. The code for the progress_icon.xml RotateDrawable is given below.

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="https://schemas.android.com/apk/res/android" >
    <item>
        <rotate
            android:drawable="@mipmap/ic_launcher"
            android:fillAfter="true"
            android:fromDegrees="0"
            android:pivotX="50%"
            android:pivotY="50%"
            android:toDegrees="360" />
    </item>
</layer-list>

The attribute android:fillAfter indicates that the transformation is applied after the animation is over. android:toDegrees value can be increased or decreased to change the speed of rotation. Generally it’s recommended to set it in multiples of 360. Let’s set the above drawable in the ProgressBar present in the activity_main.xml.

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:indeterminateDrawable="@drawable/progress_icon"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

The output reflected in the application is shown below. Let’s create a basic application that displays a string in a TextView from an ArrayList after a delay. The code for the xml layout file activity_main.xml is given below.

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="https://schemas.android.com/apk/res/android"
    xmlns:app="https://schemas.android.com/apk/res-auto"
    xmlns:tools="https://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.journaldev.spinninglogo.MainActivity">

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:indeterminateDrawable="@drawable/progress_icon"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="32dp"
        android:text="TAP ME TO GET A RANDOM QUOTE"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="A Greeting Message Awaits You"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

Take note of the efficient use of ConstraintLayout in the above code. The code for the MainActivity.java is given below.

package com.journaldev.spinninglogo;

import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {


    TextView textView;
    List<String> quotesList;
    ProgressBar progressBar;
    int i = 0;

    Handler handler = new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        quotesList = new ArrayList<>();

        quotesList.add("Hi");
        quotesList.add("Happy New Year");
        quotesList.add("Hope you have a good day");
        quotesList.add("Merry Christmas");

        Button btnTap = findViewById(R.id.button);
        textView = findViewById(R.id.textView);
        progressBar = findViewById(R.id.progressBar);


        btnTap.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                progressBar.setVisibility(View.VISIBLE);
                textView.setVisibility(View.GONE);
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {

                        if (i == quotesList.size())
                            i = 0;

                        textView.setVisibility(View.VISIBLE);
                        textView.setText(quotesList.get(i++));
                        progressBar.setVisibility(View.GONE);

                    }
                }, 3000);
            }
        });

    }


}

The output of the above application in action is given below. Note: Ignore the flickering rotation in the gifs. It’s absolutely smooth when running on a device. This brings an end to this tutorial. We’ve implemented a RotationDrawable inside a ProgressBar to achieve a spinning logo like indicator. This should be good for showing a loading progress in apps. You can download the final Android Custom Progress Bar project from the link below.

Download Android Custom Progress Bar Project

Reference: API Doc