android: Catch exception if numbers are too large for Integer

src/frontends/android/app/src/main/java/org/strongswan/android/ui/VpnProfileDetailActivity.java

@@ -623,8 +623,15 @@ public class VpnProfileDetailActivity extends AppCompatActivity
 	private Integer getInteger(EditText view)
 	{
 		String value = view.getText().toString().trim();
+		try
+		{
 			return value.isEmpty() ? null : Integer.valueOf(value);
 		}
+		catch (NumberFormatException e)
+		{
+			return null;
+		}
+	}
 
 	private class SelectUserCertOnClickListener implements OnClickListener, KeyChainAliasCallback
 	{