Misc fixes

- align wifi connection dialog edittext to viewStart
- Generate a random password when wifi tether password is null

Change-Id: Ia5ca6098c9ef4641cb4f8b4e2b126da061e62830
Fixes: 67749595
Fixes: 64967301
Test: robotests

src/com/android/settings/wifi/tether/WifiTetherSettings.java

@@ -28,6 +28,7 @@ import android.net.wifi.WifiManager;
 import android.os.Bundle;
 import android.os.UserManager;
 import android.support.annotation.VisibleForTesting;
+import android.text.TextUtils;
 import android.util.Log;
 
 import com.android.internal.logging.nano.MetricsProto;
@@ -40,6 +41,7 @@ import com.android.settingslib.core.AbstractPreferenceController;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.UUID;
 
 public class WifiTetherSettings extends RestrictedDashboardFragment
         implements WifiTetherBasePreferenceController.OnTetherConfigUpdateListener {
@@ -156,6 +158,7 @@ public class WifiTetherSettings extends RestrictedDashboardFragment
 
         config.SSID = mSSIDPreferenceController.getSSID();
         config.preSharedKey = mPasswordPreferenceController.getPassword();
+        ensureWifiConfigHasPassword(config);
         config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA2_PSK);
         config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
         config.apBand = mApBandPreferenceController.getBandIndex();
@@ -176,6 +179,15 @@ public class WifiTetherSettings extends RestrictedDashboardFragment
                 .updateDisplay();
     }
 
+    @VisibleForTesting
+    static void ensureWifiConfigHasPassword(WifiConfiguration config) {
+        if (TextUtils.isEmpty(config.preSharedKey)) {
+            String randomUUID = UUID.randomUUID().toString();
+            //first 12 chars from xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
+            config.preSharedKey = randomUUID.substring(0, 8) + randomUUID.substring(9, 13);
+        }
+    }
+
     @VisibleForTesting
     class TetherChangeReceiver extends BroadcastReceiver {
         @Override