smooth progress bar in action bar

progressbar.xml

<?xml version="1.0" encoding="utf-8"?>

<fr.castorflex.android.smoothprogressbar.SmoothProgressBar
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/progressBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:indeterminate="true"
    android:minHeight="@dimen/progress_bar_height"
    app:spb_sections_count="6"
    app:spb_color="@color/orange"
    app:spb_speed="1.0"
    app:spb_stroke_width="@dimen/progress_bar_height"
    app:spb_stroke_separator_length="4dp"
    app:spb_reversed="false"
    app:spb_mirror_mode="false"
    />

ProgressBarWrapper.java

package util;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.ProgressBar;

import com.R;
import com.nineoldandroids.view.ViewHelper;

public class ProgressBarWrapper {
    private final boolean mAllowFade;
    ProgressBar mProgressBar;


    public ProgressBarWrapper(Context context, View decorView) {
        mAllowFade = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB;

        mProgressBar = (ProgressBar) LayoutInflater.from(context).inflate(R.layout.progressbar, null, false);
        mProgressBar.setVisibility(View.GONE);
        if (mAllowFade) {
            ViewHelper.setAlpha(mProgressBar, 0f);
        }

        // get the action bar layout
        int actionBarId = context.getResources().getIdentifier("action_bar_container", "id", "android");
        FrameLayout f = (FrameLayout) decorView.findViewById(actionBarId);
        if (f == null) {
            f = (FrameLayout) decorView.findViewById(com.actionbarsherlock.R.id.abs__action_bar_container);
        }

        // add the view to that layout
        FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        params.gravity = Gravity.BOTTOM;
        f.addView(mProgressBar, params);
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public void show() {
        mProgressBar.setVisibility(View.VISIBLE);
        if (mAllowFade) {
            ObjectAnimator.ofFloat(mProgressBar, "alpha", 0f, 1f).start();
        }
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public void hide() {
        if (mAllowFade) {
            ObjectAnimator anim = ObjectAnimator.ofFloat(mProgressBar, "alpha", 1f, 0f);
            anim.addListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mProgressBar.setVisibility(View.GONE);
                }
            });
            anim.start();
        } else {
            mProgressBar.setVisibility(View.GONE);
        }
    }
}

This was useful for me, thanks!