[remoting android] Initialize It2Me host and implement Connect()

remoting/android/host/src/org/chromium/chromoting/host/MainActivity.java

Index: remoting/android/host/src/org/chromium/chromoting/host/MainActivity.java
diff --git a/remoting/android/host/src/org/chromium/chromoting/host/MainActivity.java b/remoting/android/host/src/org/chromium/chromoting/host/MainActivity.java
index 649fd42cfb1febfb164ab3e6df88d101b45b3e95..dacf21fb9e84b54e46e698d45b1df40472d61f7e 100644
--- a/remoting/android/host/src/org/chromium/chromoting/host/MainActivity.java
+++ b/remoting/android/host/src/org/chromium/chromoting/host/MainActivity.java
@@ -4,14 +4,30 @@
 
 package org.chromium.chromoting.host;
 
+import android.accounts.AccountManager;
+import android.content.Intent;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
+import android.view.View;
+
+import org.chromium.base.Log;
+import org.chromium.chromoting.base.OAuthTokenFetcher;
+import org.chromium.chromoting.host.jni.Host;
 
 /**
  * Main screen of the Chromoting Host application.
  */
 public class MainActivity extends AppCompatActivity {
+    private static final String TAG = "host";
+
+    /** Scope to use when fetching the OAuth token. */
+    private static final String TOKEN_SCOPE = "oauth2:https://www.googleapis.com/auth/googletalk";
+
+    private static final int REQUEST_CODE_CHOOSE_ACCOUNT = 0;
+
+    private Host mHost;
+    private String mAccountName;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
@@ -21,5 +37,45 @@ public class MainActivity extends AppCompatActivity {
 
         Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
+
+        if (mHost == null) {
+            mHost = new Host();
+        }
+    }
+
+    @SuppressWarnings("deprecation")
+    public void onShareClicked(View view) {
+        Intent intent = AccountManager.newChooseAccountIntent(
+                null, null, new String[] {"com.google"}, false, null, null, null, null);
+        startActivityForResult(intent, REQUEST_CODE_CHOOSE_ACCOUNT);
+    }
+
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        if (resultCode != RESULT_OK) {
+            return;
+        }
+
+        if (requestCode == REQUEST_CODE_CHOOSE_ACCOUNT) {
+            mAccountName = data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
+            requestAuthToken();
+        } else if (requestCode == OAuthTokenFetcher.REQUEST_CODE_RECOVER_FROM_OAUTH_ERROR) {
+            // User gave OAuth permission to this app (or recovered from any OAuth failure),
+            // so retry fetching the token.
+            requestAuthToken();
+        }
+    }
+
+    private void requestAuthToken() {
+        new OAuthTokenFetcher(this, mAccountName, TOKEN_SCOPE, new OAuthTokenFetcher.Callback() {
+            @Override
+            public void onTokenFetched(String token) {
+                mHost.connect(mAccountName, token);
+            }
+
+            @Override
+            public void onError(OAuthTokenFetcher.Error error) {
+                Log.e(TAG, "Error fetching token: %s", error.name());
+            }
+        }).fetch();
     }
 }