错误日志：
error: Failed to start an Appium session, err was: Error: Could not find adb in tools, platform-tools, or supported build-tools under "Documents/Software/adt-bundle-mac-x86_64-20131030/sdk"; do you have android SDK or build-tools installed into this location? Supported build tools are: 17.0.0, 18.0.1, 19.0.0, 19.0.1, android-4.2.2, android-4.3, android-4.4
info: Error: Could not find adb in tools, platform-tools, or supported build-tools under "Documents/Software/adt-bundle-mac-x86_64-20131030/sdk"; do you have android SDK or build-tools installed into this location? Supported build tools are: 17.0.0, 18.0.1, 19.0.0, 19.0.1, android-4.2.2, android-4.3, android-4.4
at ADB.checkSdkBinaryPresent (/usr/local/lib/node_modules/appium/lib/devices/android/adb.js:96:10)
at ADB.checkAdbPresent (/usr/local/lib/node_modules/appium/lib/devices/android/adb.js:123:8)
at null. (/usr/local/lib/node_modules/appium/lib/devices/android/android-common.js:274:30)
at /usr/local/lib/node_modules/appium/node_modules/async/lib/async.js:551:21
at /usr/local/lib/node_modules/appium/node_modules/async/lib/async.js:227:13
at iterate (/usr/local/lib/node_modules/appium/node_modules/async/lib/async.js:134:13)
at /usr/local/lib/node_modules/appium/node_modules/async/lib/async.js:145:25
at /usr/local/lib/node_modules/appium/node_modules/async/lib/async.js:229:17
at /usr/local/lib/node_modules/appium/node_modules/async/lib/async.js:556:34
at androidCommon.checkAppPresent (/usr/local/lib/node_modules/appium/lib/devices/android/android-common.js:286:5)