Add find by id for Android

app/android.js

@@ -15,6 +15,7 @@ var errors = require('./errors')
   , temp = require('temp')
   , async = require('async')
   , path = require('path')
+  , getTempPath = require('./helpers').getTempPath
   , UnknownError = errors.UnknownError;
 
 var Android = function(opts) {
@@ -50,6 +51,7 @@ var Android = function(opts) {
     , databaseEnabled: false
   };
   this.lastCmd = null;
+  this.apkStrings = null;
 };
 
 // Clear data, wait for app close, then start app.
@@ -299,7 +301,7 @@ Android.prototype.findElements = function(strategy, selector, cb) {
   this.findElementOrElements(strategy, selector, true, "", cb);
 };
 
-Android.prototype.findElementOrElements = function(strategy, selector, many, context, cb) {
+Android.prototype.findElementOrElementsMain = function(strategy, selector, many, context, cb) {
   var params = {
     strategy: strategy
     , selector: selector
@@ -347,6 +349,55 @@ Android.prototype.findElementOrElements = function(strategy, selector, many, con
   }
 };
 
+Android.prototype.findElementOrElements = function(strategy, selector, many, context, cb) {
+  if (strategy === "id") {
+    var me = this;
+    var ensureStringsExist = function(innerCb) {
+      if (me.apkStrings === null) {
+        var stringsFromApkJarPath = path.resolve(__dirname, '../app/android/strings_from_apk.jar');
+        var outputPath = path.resolve(getTempPath(), me.appPackage);
+        var makeStrings = ['java -jar ', stringsFromApkJarPath,
+                               ' ', me.adb.apkPath, ' ', outputPath].join('');
+        logger.debug(makeStrings);
+        exec(makeStrings, {}, function(err, stdout, stderr) {
+          if (err) {
+            logger.debug(stderr);
+            return innerCb("error making strings");
+          }
+          logger.debug("Made strings");
+          var jsonFile = path.resolve(outputPath, 'strings.json');
+          me.apkStrings = JSON.parse(fs.readFileSync(jsonFile, 'utf8'));
+          innerCb(null);
+        });
+      } else {
+        innerCb(null);
+      }
+    };
+
+    var findElementById = function(innerCb) {
+        var oldSelector = selector;
+        selector = me.apkStrings[selector];
+        if (typeof selector === "undefined") {
+          return innerCb(null,{
+                      status: status.codes.UnknownError.code
+                      , value: "ID " + oldSelector + " doesn't exist in res/values/strings.xml"
+         });
+        }
+
+        // Perform a name search using the string value for the given id.
+        strategy = "name";
+        innerCb(null);
+    };
+    var topCb = cb;
+    return async.series([
+      function(cb) { ensureStringsExist(cb); },
+      function(cb) { findElementById(cb); }
+    ], function(cb) { me.findElementOrElementsMain(strategy, selector, many, context, topCb); });
+  } else {
+    this.findElementOrElementsMain(strategy, selector, many, context, cb);
+  }
+};
+
 Android.prototype.findElementFromElement = function(element, strategy, selector, cb) {
   this.findElementOrElements(strategy, selector, false, element, cb);
 };