Android自动化测试初探(二): Hierarchyviewer 捕获Element的实现原理

                Android SDK tools下的工具hierarchyviewer可以展现Device上的Element的层次分布和自身属性,其核心函数之一就是LoadScene,研究后发现其实现方法是向Device4939端口通过socket的方式发送了一个DUMP的命令,Device会自动处理该命令并将所有Screen上的Element层次结构和属性一并发回,实现代码如下:

public static void listElement(IDevice device){

Socket socket;

      BufferedReader in;

      BufferedWriter out;

      socket = null;

      in = null;

      out = null;

           

      do{

        DeviceBridge.setupDeviceForward(device);

      }while(4939!=DeviceBridge.getDeviceLocalPort(device));

           

      socket = new Socket();

      try {

socket.connect(new InetSocketAddress("127.0.0.1", DeviceBridge.getDeviceLocalPort(device)));

 

out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));

 

in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

           

System.out.println("==> DUMP");

out.write((new StringBuilder()).append("DUMP -1").toString());

           

out.newLine();

            out.flush();

            do

            {

                  String line;

if ((line = in.readLine()) == null || "DONE.".equalsIgnoreCase(line))

                        break;

                  line = line.trim();

                  System.out.println(line);

            } while (true);

      } catch (IOException e) {

                  e.printStackTrace();

      }

}

运行后的结果摘录其中一部分(button5),列举如下。注:当前device中运行的是2.1SDK中自带的Calculator程序:

com.android.calculator2.ColorButton@43b8bee8 mText=1,5 getEllipsize()=4,null mMinWidth=1,0 mMinHeight=1,0 mMeasuredWidth=2,79 mPaddingBottom=1,0 mPaddingLeft=1,0 mPaddingRight=1,0 mPaddingTop=1,0 mMeasuredHeight=2,78 mLeft=2,81 mPrivateFlags_DRAWING_CACHE_INVALID=3,0x0 mPrivateFlags_DRAWN=4,0x20 mPrivateFlags=8,16779312 mID=9,id/digit5 mRight=3,160 mScrollX=1,0 mScrollY=1,0 mTop=1,0 mBottom=2,78 mUserPaddingBottom=1,0 mUserPaddingRight=1,0 mViewFlags=9,402669569 getBaseline()=2,54 getHeight()=2,78 layout_gravity=4,NONE layout_weight=3,1.0 layout_bottomMargin=1,0 layout_leftMargin=1,1 layout_rightMargin=1,0 layout_topMargin=1,0 layout_height=11,FILL_PARENT layout_width=11,FILL_PARENT getTag()=4,null getVisibility()=7,VISIBLE getWidth()=2,79 hasFocus()=5,false isClickable()=4,true isDrawingCacheEnabled()=5,false isEnabled()=4,true isFocusable()=4,true isFocusableInTouchMode()=5,false isFocused()=5,false isHapticFeedbackEnabled()=4,true isInTouchMode()=4,true isOpaque()=5,false isSelected()=5,false isSoundEffectsEnabled()=4,true willNotCacheDrawing()=5,false willNotDraw()=5,false

另外还支持如下命令:

- LIST will show the list of windows:

LIST

43514758 com.android.launcher/com.android.launcher.Launcher

4359e4d0 TrackingView

435b00a0 StatusBarExpanded

43463710 StatusBar

43484c58 Keyguard

DONE.

 

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