a circle progress button like iOS 
 

Usage:

Gradle

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

Step 2. Add the dependency  

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

code

//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);
}
 

xml

layout

 <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" />
 

drawable-> bounder.xml

<?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>