UIDevice: dumpWindowHierarchy提示open failed: EACCES (Permission denied)错误

本文链接：https://blog.youkuaiyun.com/shfscut/article/details/77051131

代码如下：

@RunWith(AndroidJUnit4.class)
@SdkSuppress(minSdkVersion = 18)
public class UiTestDemo {
    @Test
    public void pressKey() throws RemoteException, IOException, UiObjectNotFoundException {
        UiDevice device=UiDevice.getInstance(InstrumentationRegistry.getInstrumentation());
        File myFile = new File(Environment.getExternalStorageDirectory() + "/shf.xml");
        System.out.println("it is test" + Environment.getExternalStorageDirectory());
        device.dumpWindowHierarchy(myFile);
    }
}

运行结果报错：open failed: EACCES (Permission denied)

究其原因：
1. AndroidManifest.xml增加权限控制

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

打开手机对应App的权限控制

进入 settings->apps-> YOURAPP -> permissions

通过以上设置，成功生成了xml文件

备注：
1. 通过System.out.println(“it is test” + Environment.getExternalStorageDirectory());获取文件存放在手机的位置(我的是：/storage/emulated/0)
2. pull该xml文件：adb pull /storage/emulated/0/shf.xml