执行testng appium用例失败，自动截图

package com.fsssc.htsgl.utils;
import io.appium.java_client.android.AndroidDriver;

import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.WebElement;
import org.testng.ITestResult;
import org.testng.TestListenerAdapter;
import com.fc.boxapk.ApkBoxOperation;

public class ScreenShotListener extends TestListenerAdapter {
    @Override
    public void onTestFailure(ITestResult tr) {
         //安卓程序的操作类 
        ApkBoxOperation apkRemoteControl = ApkBoxOperation.getInstance();
        //监控截图的driver
        AndroidDriver<WebElement> driver = apkRemoteControl.driver;
        // 截图文件夹
        File path = new File("screenshots");
        //截图位置及文件名  名称为 标识 + 类名 + 方法名
        String name = path.getAbsolutePath() + File.separator + MysqlUtils.executionFlag+"_"+MysqlUtils.exeClassName +"."+ tr.getMethod().getMethodName() + ".png";
        // 
        File screenShot = driver.getScreenshotAs(OutputType.FILE);
        try {
            FileUtils.copyFile(screenShot, new File(name));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

package com.fsssc.htsgl.testcases;
import java.io.IOException;
import junit.framework.Assert;
import org.testng.annotations.Listeners;
import org.testng.annotations.Test;
import com.fc.boxapk.ApkBoxOperation;
import com.fc.htgl.utils.MysqlUtils;
import com.fc.htgl.utils.PropsUtil;
import com.fc.htgl.utils.ScreenshotListener;
// 监听
@Listeners({ScreenShotListener.class})
public class DevTest{
    //安卓程序初始化
    ApkBoxOperation apkBoxOperation  = ApkBoxOperation.getInstance();  
    // 赋值一个执行编码给执行标识
    String executionFlag = PropsUtil.timeToString();
    
    @Test
    public void testCase() throws IOException {
         //本次类名赋值给变量
        MysqlUtils.exeClassName = Thread.currentThread().getStackTrace()[1].getClassName();
        // 执行标识赋值给变量
        MysqlUtils.executionFlag = executionFlag;
        // 安卓程序登录
        apkBoxOperation.courierLogin("13488883323", "4566656");    
        // 执行完毕 断言失败，执行截图
        Assert.assertFalse(true);
        // 关掉app
        apkBoxOperation.driver.closeApp();        
    }
}