How to use this.adb.back method in Appium Android Driver

1var webdriverio = require('webdriverio');2var options = {3    desiredCapabilities: {4    }5};6var client = webdriverio.remote(options);7    .init()8    .back()9    .end();10driver.navigate().back();11driver.navigate().back();12driver.navigate().back();13driver.navigate().back();14    public boolean onOptionsItemSelected(MenuItem item) {15        switch (item.getItemId()) {16                Intent intent = new Intent(this, MainActivity.class);17                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);18                startActivity(intent);19                return true;20        }21        return super.onOptionsItemSelected(item);22    }23    public void onBackPressed() {24        Intent intent = new Intent(this, MainActivity.class);25        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);26        startActivity(intent);27    }28    public boolean onKeyDown(int keyCode, KeyEvent event) {29        if (

1var wd = require('wd');2var desired = {3};4var driver = wd.promiseChainRemote('localhost', 4723);5  .init(desired)6  .then(function() { return driver.back(); })7  .then(function() { return driver.sleep(1000); })8  .then(function() { return driver.quit(); })9  .done();

1const wd = require('wd');2const { androidConfig } = require('./config');3const { assert } = require('chai');4const driver = wd.promiseChainRemote(androidConfig);5(async function () {6  try {7    await driver.init(androidConfig.capabilities);8    await driver.setImplicitWaitTimeout(10000);9    await driver.back();10  } catch (err) {11    console.log(err);12  }13})();14const currentActivity = await driver.currentActivity();15assert.equal(currentActivity, 'com.example.android.apis.ApiDemos');

1var wd = require('wd');2var assert = require('assert');3var desiredCaps = {4};5driver.init(desiredCaps).then(function () {6  return driver.back();7});8driver.quit();