Switch to using settings for android sdk location

Summary: A settings screen has been added where android home can be set. This changes the downstream code to use this value rather than the `env.PATH` variable.

Reviewed By: passy

Differential Revision: D17713288

fbshipit-source-id: 51551652c9c2f468e1117c18785123348e4b4576

src/init.tsx

@@ -16,7 +16,7 @@ import BugReporter from './fb-stubs/BugReporter';
 import setupPrefetcher from './fb-stubs/Prefetcher';
 import {createStore} from 'redux';
 import {persistStore} from 'redux-persist';
-import reducers, {Actions, State as StoreState} from './reducers/index';
+import reducers, {Store, Actions, State as StoreState} from './reducers/index';
 import dispatcher from './dispatcher/index';
 import TooltipProvider from './ui/components/TooltipProvider';
 import config from './utils/processConfig';
@@ -27,6 +27,7 @@ import fbConfig from './fb-stubs/config';
 import {isFBEmployee} from './utils/fbEmployee';
 import WarningEmployee from './chrome/WarningEmployee';
 import React from 'react';
+import path from 'path';
 
 const store = createStore<StoreState, Actions, any, any>(
   reducers,
@@ -72,6 +73,21 @@ const AppFrame = () => {
   );
 };
 
+function setProcessState(store: Store) {
+  const androidHome = store.getState().settingsState.androidHome;
+
+  if (!process.env.ANDROID_HOME) {
+    process.env.ANDROID_HOME = androidHome;
+  }
+
+  // emulator/emulator is more reliable than tools/emulator, so prefer it if
+  // it exists
+  process.env.PATH =
+    ['emulator', 'tools', 'platform-tools']
+      .map(directory => path.resolve(androidHome, directory))
+      .join(':') + `:${process.env.PATH}`;
+}
+
 function init() {
   ReactDOM.render(<AppFrame />, document.getElementById('root'));
   initLauncherHooks(config(), store);
@@ -85,6 +101,8 @@ function init() {
 
 // rehydrate app state before exposing init
 persistStore(store, undefined, () => {
+  // Make sure process state is set before dispatchers run
+  setProcessState(store);
   dispatcher(store, logger);
   // make init function callable from outside
   window.Flipper.init = init;