Fixes: #249 Added CustomTabs in register link

Author: jainkuniya

app/build.gradle

@@ -75,6 +75,7 @@ dependencies {
     compile 'commons-lang:commons-lang:2.6'
     compile 'org.ccil.cowan.tagsoup:tagsoup:1.2.1'
     compile 'com.squareup.picasso:picasso:2.5.2'
+    compile 'com.android.support:customtabs:23.3.0'
     compile('com.crashlytics.sdk.android:crashlytics:2.6.2@aar') {
         transitive = true;
     }

app/src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.zulip.android"
-    >
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.zulip.android">
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.GET_ACCOUNTS" />
@@ -17,6 +17,9 @@
     <uses-permission android:name="android.permission.USE_CREDENTIALS"/>
     <uses-permission android:name="android.permission.VIBRATE"/>
 
+    <uses-sdk android:targetSdkVersion="23" android:minSdkVersion="13"
+        tools:overrideLibrary="com.android.support:customtabs:23.3.0,android.support.customtabs"/>
+
     <application
         android:name="com.zulip.android.ZulipApp"
         android:allowBackup="false"

app/src/main/java/com/zulip/android/activities/LoginActivity.java

@@ -5,7 +5,9 @@
 import android.content.Intent;
 import android.content.IntentSender.SendIntentException;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
+import android.support.customtabs.CustomTabsIntent;
 import android.support.v7.app.AlertDialog;
 import android.support.v7.widget.Toolbar;
 import android.util.Log;
@@ -446,14 +448,33 @@ public void onTaskFailure(String result) {
                 asyncDevGetEmails.execute();
                 break;
             case R.id.register:
-                Intent intent = new Intent(Intent.ACTION_VIEW,Uri.parse(serverIn.getText().toString()+"register"));
-                startActivity(intent);
+                openRegister();
                 break;
             default:
                 break;
         }
     }
 
+    private void openRegister() {
+        Uri uri;
+        if (serverIn==null || serverIn.getText().toString().isEmpty() || serverIn.getText().toString().equals(""))
+        {
+            return;
+        }else
+        {
+            uri = Uri.parse(serverIn.getText().toString()+"register");
+        }
+        if (Build.VERSION.SDK_INT < 15)
+        {
+            Intent intent = new Intent(Intent.ACTION_VIEW,uri);
+            startActivity(intent);
+            return;
+        }
+        CustomTabsIntent.Builder builder = new CustomTabsIntent.Builder();
+        CustomTabsIntent intent = builder.build();
+        intent.launchUrl(LoginActivity.this,uri);
+    }
+
     private boolean isInputValidForDevAuth() {
         boolean isValid = true;