appium中怎么连接android真机测试

启动appium，执行testng测试脚本，脚本启动配置项如下：
import io.appium.java_client.AppiumDriver;import org.openqa.selenium.By;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.remote.CapabilityType;
import org.openqa.selenium.remote.DesiredCapabilities;

DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setCapability(CapabilityType.BROWSER_NAME, "");//这句不是必须的
capabilities.setCapability("deviceName","Android Emulator");
capabilities.setCapability("platformVersion", "4.4");
capabilities.setCapability("platformName","Android");
capabilities.setCapability("appPackage", "com.android.calculator2");
capabilities.setCapability("appActivity", ".Calculator");
AppiumDriver driver = new AppiumDriver(new URL("http://127.0.0.1:4723/wd/hub"), cap