Question

我正在尝试从我的Android Activity发送一封电子邮件，如下所示：

@Override
        public void onClick(View view) {                       
            processdialog = new ProgressDialog(LoginScreen.this);
            processdialog.setTitle("Test mail sturen...");
            processdialog.setMessage("even wachten a.u.b..."); 
            processdialog.setCancelable(false);
            processdialog.show();
            testMailButton.setEnabled(false);
            AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {
                @Override
                protected void onPreExecute() {
                    super.onPreExecute();


                }

                @Override
                protected Void doInBackground(Void... arg0) {
                    try {
                        properties.setProperty("emailTo", emailContactField.getText().toString());
                        properties.setProperty("emailFrom", emailField.getText().toString());
                        properties.setProperty("passWFrom", passwordField.getText().toString());
                        String[] temp = { properties.getProperty("emailTo").toString()};
                        setupMail.updateUserInfo(temp,properties.getProperty("emailFrom"), properties.getProperty("passWFrom"));
                        loggedIn = setupMail.sendTestMail();
                        loginTryDone = true;
                    } catch (Exception e1) {
                        e1.printStackTrace();
                    }
                    return null;
                }

                @Override
                protected void onPostExecute(Void result) {
                    if (processdialog != null) {
                        processdialog.dismiss();
                        testMailButton.setEnabled(true);
                    }
                }

            };
            if(!loggedIn){
                task.execute();

但是我的用户界面并没有给我进行进度调整，只是停留了几秒钟，直到发送邮件为止。谁能告诉我这里做错了什么？感谢

Answer 1

请使用AsyncTask执行此操作。线程锁定ProgressDialog，为此您没有看到它。

@Override
public void onClick(View v) {
    if(!loggedIn){
        new MailTask().execute((Void) null);
    }
}

private class MailTask extends AsyncTask<Void, Void, Void> {

    ProgressDialog pd;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pd = new ProgressDialog(Z.this);
        pd.setTitle("TITLE");
        pd.setMessage("MESSAGE");
        pd.show();

        testMailButton.setEnabled(false);

    }

    @Override
    protected Void doInBackground(Void... params) {
        try {
            properties.setProperty("emailTo", emailContactField.getText().toString());
            properties.setProperty("emailFrom", emailField.getText().toString());
            properties.setProperty("passWFrom", passwordField.getText().toString());
            String[] temp = { properties.getProperty("emailTo").toString()};
            setupMail.updateUserInfo(temp,properties.getProperty("emailFrom"), properties.getProperty("passWFrom"));
            loggedIn = setupMail.sendTestMail();
            loginTryDone = true;
        } catch (Exception e1) {
            e1.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        if (pd != null) {
            pd.dismiss();
            testMailButton.setEnabled(true);
        }
    }
}

Answer 2

我已经找到了问题所在。这与我使Activity等待Asynctask的事实有关。这让它无法使用。感谢大家的帮助。

UI在发送电子邮件时卡住了

2 个答案: