Any faster way to dump UI hierarchy?

问题

Right now I'm using uiautomator do dump the UI like this:

adb shell uiautomator dump

And it works fine except that it takes around 3 seconds to perform it. So I wonder if there is a faster way to do it? Like creating a service that dump the UI or will it take just as long?

回答1:

Guess I should answer my own question as I found a better way to do it. I found this project that use uiautomator togheter with a light weight rpc server so you can send commands to the device:

https://github.com/xiaocong/android-uiautomator-server#build

This make the dumping almost instantly and works really nice. He also have a python project if you want to see how to make the rpc calls:

https://github.com/xiaocong/uiautomator

But I have created a small example here.

Start the server:

# Start the process
process = subprocess.Popen(
        'adb shell uiautomator runtest '
        'bundle.jar uiautomator-stub.jar '
        '-c com.github.uiautomatorstub.Stub', stdout=subprocess.PIPE, shell=True)
# Forward adb ports 
subprocess.call('adb forward tcp:9008 tcp:9009')

Function to call commands ("ping", "dumpWindowHierarchy" etc):

def send_command(self, method_name, *args):
    """
    Send command to the RPC server

    Args:
        method_name(string): Name of method to run
        *args: Arguments
    """
    data = {
        'jsonrpc': '2.0',
        'method': method_name,
        'id': 1,
    }
    if args:
        data['params'] = args
    request = urllib2.Request(
        'http://localhost:{0}/jsonrpc/0'.format(self.local_port),
        json.dumps(data),
        {
            'Content-type': 'application/json'
        })
    try:
        result = urllib2.urlopen(request, timeout=30)
    except Exception as e:
        return None
    if result is None:
        return None
    json_result = json.loads(result.read())
    if 'error' in json_result:
        raise JsonRPCError('1',
                           'Exception when sending command to '
                           'UIAutomatorServer: {0}'.format(
                               json_result['error']))
    return json_result['result']

Note that you have to push the files (bundle.jar anduiautomator-stub.jar) from the first project to the device first and put them in "/data/local/tmp/"

回答2:

Seems like an old thread but here is an updated solution. This can simply be achieved in JS/Node applications by using following npm module. This module uses the same server as mentioned in the above answer but does it seemlesly.

npm install uiautomator-server

Then add following code in your project:

const UIAutomator = require('uiautomator-server');

const myDevice = new UIAutomator((err, currDevice) => {

    if (err) {

    console.log(`Error starting UI Automator server : ${err}`);

    }
    console.log(`UI Automator server started`);

    currDevice.dump(false, (error, xmlDump) => {

      if (error) {

       console.log(`Error while getting dump : ${error}`);

      }
      console.log(`xmlDump in as string: ${xmlDump}`);

  });

});

Starting the server(creating new automator object) may take some time (around 1 sec), But once the serve is started, dump and other operations are very fast i.e less than 300 ms in most cases. You can create a new UIAutomator object once and then use the same instance later for all your operations

来源：https://stackoverflow.com/questions/27256911/any-faster-way-to-dump-ui-hierarchy

标签

android

android-layout

android-ui

android-uiautomator