进度条3

package com.bawie.www.week1demo;import android.app.Activity;import android.os.Bundle;import android.support.annotation.Nullable;/** * Created by 杨文倩 on 2017/11/4. */public class Trapezoid  extends Activity {    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    }}