Resolve issue that app crashes when clicks a TextView with autoLink be set to email or all but the system has no email client.

FixCrashWhenSystemHasNoEmailClient

@Override
public void startActivity(Intent intent) {
    if (intent.toString().indexOf("mailto") != -1) { // Any way to judge that this is to sead an email
        PackageManager pm = getPackageManager();
        // The first Method
        List<ResolveInfo> activities = pm.queryIntentActivities(intent, 0);
        if (activities == null || activities.size() == 0) {
            // Do anything you like, or just return
            return;
        }

        // Another method
        // ResolveInfo resolveInfo = pm.resolveActivity(intent, 0);
        // if (resolveInfo == null)

        // Yet another metod
        // Intent.createChooser(intent, "Choose email client");
    }
    super.startActivity(intent);
}