自定义饼状图，仿支付宝里面的资产分布情况。
compile ('com.xyzlf.view:pieview:0.0.1') {
exclude group: 'com.android.support', module: 'appcompat-v7'
}
有任何使用问题，可以给我发邮件：
Author：张利峰
E-mail：519578280@qq.com
Copyright(c)2016 xyzlf Open Source Project
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.