发送邮件反馈的页面，如何判断邮件已经发送成功并退出当前页面？

如题上代码：     Intent mE_mailIntent = new Intent(android.content.Intent.ACTION_SEND);
     mE_mailIntent.setType("message/rfc822");
     
String[] strE_mailBody = new String[]{
help_feedback.getText().toString()};

String[] tos= {"[email protected]"};
String[] ccs= {"[email protected]"};
mE_mailIntent.putExtra(Intent.EXTRA_EMAIL, tos);
mE_mailIntent.putExtra(Intent.EXTRA_CC, ccs);
mE_mailIntent.putExtra(Intent.EXTRA_TEXT, strE_mailBody);
mE_mailIntent.putExtra(Intent.EXTRA_SUBJECT, "反馈信息");
         

if(strE_mailBody.length == 0){
Toast.makeText(getApplicationContext(), "请输入反馈意见！",
     Toast.LENGTH_SHORT).show();

}
else  {
  //发送邮件
  startActivity(Intent.createChooser(mE_mailIntent, "Your client"));
            
 
}
        
      }
   
 }
      );