<com.wingsofts.circlepercentview.CirclePercentView
    android:id="@+id/circleView"
    app:stripeWidth="15dp"    
    app:centerTextSize="16sp"
    app:percent="45"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

   mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int n = (int)(Math.random()*100);
                mCirclePercentView.setPercent(n);
            }
        });