等待进程完成以启动另一个进程

当用户单击我的按钮时，它会执行两个功能：发送短信和发送电子邮件。

当我单击此按钮时，正在发送短信，突然弹出电子邮件选择客户端窗口。我希望仅在完成短信发送功能后才显示电子邮件客户端选择器窗口。

我应该如何更改我的代码？

     Button hi= (Button) findViewById(R.id.button1);
     hi.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            sendsms();
            sendemail();
     } 

     private void sendemail() {

        Intent email = new Intent(Intent.ACTION_SEND);
        email.putExtra(Intent.EXTRA_EMAIL, new String[]{ to1});
        email.putExtra(Intent.EXTRA_CC, new String[]{ to2});
        email.putExtra(Intent.EXTRA_BCC, new String[]{to3});
        email.putExtra(Intent.EXTRA_BCC, new String[]{to4});
        email.putExtra(Intent.EXTRA_BCC, new String[]{to5});

        email.putExtra(Intent.EXTRA_SUBJECT, subject);
        email.putExtra(Intent.EXTRA_TEXT, emailmessage);

        //need this to prompts email client only
        email.setType("message/rfc822");

        startActivity(Intent.createChooser(email, "Choose an Email client :"));


    }


    sendsms()
    {
        String receipentsNumber[] = {"111","222","333","444","555"};

        for (int i = 0; i < receipentsNumber.length; i++) {

            try {
                SmsManager smsManager = SmsManager.getDefault();
                smsManager.sendTextMessage(receipentsNumber[i], null, message, null,
                        null);
                System.ot.println(getApplicationContext(), "SMS Sent to" + " " + receipentsNumber[i], Toast.LENGTH_LONG).show();

            } catch (Exception e) {
                Toast.makeText(getApplicationContext(),
                        "SMS faild, please try again later!", Toast.LENGTH_LONG)
                        .show();
                e.printStackTrace();
            }

        }
    }

});