Add it in your root build.gradle at the end of repositories:
	allprojects {
		repositories {
			...
			maven { url 'https://jitpack.io' }
		}
	}

	dependencies {
	        compile 'com.github.jiang111:CProgressButton:{last-version}'
	}

//config in your app
CProgressButton.initStatusString(new String[]{"download","pause","complete","error","delete"});
 //use 
CProgressButton progressButton = (CProgressButton)findViewById(R.id.btn2);
if(progressButton.getState() != CProgressButton.STATE.NORMAL){
	progressButton.normal(0/1/2/3); //max value is String[].length - 1;  call anytime;
}else{
	progressButton.startDownload();  //you must call startDownload() before download(progress);
	progressButton.download(progress);
}

 <com.jiang.android.pbutton.CProgressButton
            android:layout_width="65dp"
            android:layout_marginLeft="50dp"
            android:gravity="center"
            app:stroke_width="1dp"  //stroke outside width -> the width in bounder.xml
            app:radius="40dp"       //outside  radius  -> the radius in bounder.xml
            app:color="@color/colorAccent"       //all line color the color in bounder.xml
            app:drawable_xml="@drawable/bounder"  //bg drawable
            android:textSize="12sp"
            android:textColor="@color/colorAccent"
            android:id="@+id/btn"
            android:layout_height="30dp" />

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <stroke android:color="@color/colorAccent" android:width="1dp" />
    <corners android:radius="40dp" />
</shape>

Copyright 2016 NewTab

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.