Custom Circular Progress Bar Android

activity.xml

                    <ProgressBar
                        android:id="@+id/progress_bar"
                        style="?android:attr/progressBarStyleHorizontal"
                        android:layout_width="110dp"
                        android:layout_height="110dp"
                        android:background="@drawable/circle_shape"
                        android:indeterminate="false"
                        android:max="30"
                        android:progress="15"
                        android:progressDrawable="@drawable/circular_progress_bar"
                        android:layout_centerVertical="true"
                        android:layout_centerInParent="true"
                        android:layout_centerHorizontal="true"

                        />

circle_shape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="ring"
    android:innerRadiusRatio="2.5"
    android:thickness="3dp"
    android:useLevel="false">

    <solid android:color="#CCC" />

</shape>

circular_progress_bar

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="270"
    android:toDegrees="270">
    <shape
        android:innerRadiusRatio="2.5"
        android:shape="ring"
        android:thickness="3dp"
        android:useLevel="true"><!-- this line fixes the issue for lollipop api 21 -->

        <gradient
            android:angle="0"
            android:endColor="#42A530"
            android:startColor="#42A530"
            android:type="linear"
            android:useLevel="false" />
    </shape>
</rotate>

CustomProgressBarActivity.java

private ProgressBarAnimation progressBarAnimation;

progressBar = (ProgressBar) findViewById(R.id.progress_bar);

progressBarAnimation = new ProgressBarAnimation(vhHeaderTwo.progressBar, 0, Integer.parseInt(studentAttendance.getTotal().getPresentDays()));
progressBar.setMax(Integer.parseInt(studentAttendance.getTotal().getOperatingDays()));
progressBarAnimation.setDuration(800);
progressBarAnimation.setInterpolator(new AnticipateInterpolator());
progressBar.startAnimation(progressBarAnimation);
progressBar.getProgressDrawable().setColorFilter(Color.parseColor(primaryColor), PorterDuff.Mode.SRC_IN);

ProgressBarAnimation.java

public class ProgressBarAnimation extends Animation {

    private ProgressBar progressBar;
    private float from;
    private float to;

    public ProgressBarAnimation(ProgressBar progressBar, float from, float to) {
        super();
        this.progressBar = progressBar;
        this.from = from;
        this.to = to;
    }


    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        super.applyTransformation(interpolatedTime, t);
        float value = from + (to - from) * interpolatedTime;
        progressBar.setProgress((int) value);
    }

}