Question

我有2项活动。第一个活动具有形式，用户可以插入一些信息。然后有一个按钮，它导致第二个活动，其中用户插入一些更多的信息，然后保存在MySQL数据库中。我使用intent.putExtra但不保存数据库中的任何内容。因为我是android的新手，所以我不确定这是否正确。我已将此帖How to get extra data from intent in android?用作参考这是第一项活动

public class Reservation extends Activity {
    static String Name;
static String Email;
static String Phone;
static String Comment;
static String DateTime;
static String numberOfPeople;

private EditText editText1, editText3, editText2, editText4, txtDate, editText5; 
private Button btnMenues, btnCalendar, btnTimePicker;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.reservation);

    editText1 = (EditText) findViewById(R.id.personName);
    editText3 = (EditText) findViewById(R.id.personPhone);
    editText2 = (EditText) findViewById(R.id.personEmail);
    editText4 = (EditText) findViewById(R.id.personComment);
    txtDate = (EditText) findViewById(R.id.datePicker);
    editText5 = (EditText) findViewById(R.id.editText5);

    btnCalendar = (Button) findViewById(R.id.btnCalendar);
    btnMenues = (Button) findViewById(R.id.continueWithReservation);


    btnMenues.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            //Name = editText1.getText().toString();
            //Phone = editText3.getText().toString();
            //Email = editText2.getText().toString();
            //Comment = editText4.getText().toString();
            //DateTime = txtDate.getText().toString();
            //DateTime = txtTime.getText().toString();
            //numberOfPeople = numberOfPeoples.getText().toString();
            //new SummaryAsyncTask().execute((Void) null);

            Intent intent = new Intent(Reservation.this, ReservationSecond.class);
            String Name = editText1.getText().toString();
            String Email = editText2.getText().toString();
            String Phone = editText3.getText().toString();
            String Comment = editText4.getText().toString();
            String DateTime = txtDate.getText().toString();
            String numberOfPeople = editText5.getText().toString();

            intent.putExtra(Name, Name.getBytes().toString());
            intent.putExtra(Email, Email.getBytes().toString());
            intent.putExtra(Phone, Phone.getBytes().toString());
            intent.putExtra(Comment, Comment.getBytes().toString());
            intent.putExtra(DateTime, DateTime.getBytes().toString());
            intent.putExtra(numberOfPeople, numberOfPeople.getBytes().toString());
            startActivity(intent);
        }
    }); 
}
}

这是第二个必须接收数据并保存在BD中的活动

public class ReservationSecond extends Activity {

String getName;
String getEmail;
String getPhone;
String getComment;
String getDateTime;
String getnumberOfPeople;

private Button btnMenues;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.reservation_second);

    btnMenues = (Button) findViewById(R.id.finish);

    btnMenues.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Bundle extras = getIntent().getExtras();
            if (extras != null) {
                getName = extras.getString("Name");
                getEmail = extras.getString("Email");
                getPhone = extras.getString("Phone");
                getComment = extras.getString("Comment");
                getDateTime = extras.getString("DateTime");
                getnumberOfPeople = extras.getString("numberOfPeople");
        }

            new SummaryAsyncTask().execute((Void) null);

            startActivity(getIntent());
        }
    }); 
}

class SummaryAsyncTask extends AsyncTask<Void, Void, Boolean> {

    private void postData(String getNameToData, String getEmailData, String getPhoneData,
            String getCommentData, String getDateTimeData, String getnumberOfPeopleData) {

        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://link/saveReservation.php");

        try {
            ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(4);
            nameValuePairs.add(new BasicNameValuePair("Name", getNameToData));
            nameValuePairs.add(new BasicNameValuePair("Email", getEmailData));
            nameValuePairs.add(new BasicNameValuePair("Phone", getPhoneData));
            nameValuePairs.add(new BasicNameValuePair("Comment", getCommentData));
            nameValuePairs.add(new BasicNameValuePair("Date", getDateTimeData));
            nameValuePairs.add(new BasicNameValuePair("numberOfPeople", getnumberOfPeopleData));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            HttpResponse response = httpclient.execute(httppost);
        }
        catch(Exception e)
        {
            Log.e("log_tag", "Error:  "+e.toString());
        }
    }

    @Override
    protected Boolean doInBackground(Void... params) {
        postData(getName, getEmail, getPhone, getComment, getDateTime, getnumberOfPeople );
        return null;
    }

}
}

更新。在这样的第二次活动中？

if (extras != null) {
                extras.getString("Name");
                extras.getString("Email");
                extras.getString("Phone");
                extras.getString("Comment");
                extras.getString("DateTime");
                extras.getString("numberOfPeople");
            }

而不是

                if (extras != null) {
                String Name = extras.getString("Name");
                String Email = extras.getString("Email");
                String Phone = extras.getString("Phone");
                String Comment = extras.getString("Comment");
                String DateTime = extras.getString("DateTime");
                String numberOfPeople = extras.getString("numberOfPeople");
            }

这是getReservation.php

$icon = mysql_connect("localhost","user","password");
if(!$icon)
{
   die('Could not connect : ' . mysql_erroe());
}
mysql_select_db("database", $icon)or die("database selection error");
echo json_encode($data);

$Name=$_POST['Name'];
$Phone=$_POST['Phone'];
$Email=$_POST['Email'];
$Comment=$_POST['Comment'];
$DateTime=$_POST['DateTime'];
$numberOfPeople=$_POST['numberOfPeople'];

 mysql_query("INSERT INTO reservation (Name, Phone, Email, Comment, DateTime, numberOfPeople)
VALUES ('$Name', '$Phone', '$Email', '$Comment', NOW(), '$numberOfPeople')",$icon);

mysql_close（$图标）;

Answer 1

请参阅the documentation了解putExtra（）的工作原理以及您必须将其作为输入 enter image description here

为了获得这样的额外费用

extras.getString("Name");

你必须像这样把它们放在

intent.putExtra("Name", Name.getBytes().toString());

注意名称

周围的额外引号

另外，因为你传递的是字符串，所以你可以这样做

intent.putExtra("Name", Name);

- ＆gt; bytes - ＆gt;字符串转换是多余的

Answer 2

您将值移交为键和值。这不起作用，因为更改的值也会更改密钥并阻止您在第二个Activity中获取您的信息。

试试这个：

intent.putExtra("Name", Name.getBytes().toString());
intent.putExtra("Email", Email.getBytes().toString());
intent.putExtra("Phone", Phone.getBytes().toString());
intent.putExtra("Comment", Comment.getBytes().toString());
intent.putExtra("DateTime", DateTime.getBytes().toString());
intent.putExtra("numberOfPeople", numberOfPeople.getBytes().toString());

Answer 3

您将用户输入的值作为附加项中的键传递。因此，如果你试图通过＆＃34; Name＆＃34;那么它将不会有任何价值。键。

使用

    intent.putExtra("Name", Name.getBytes().toString());

而不是

    intent.putExtra(Name, Name.getBytes().toString());

同样在第二个活动中使用您声明的全局变量而不是创建本地变量。在传递全局变量并初始化本地变量时。

使用

    if (extras != null) {
            Name = extras.getString("Name");
            Email = extras.getString("Email");
            Phone = extras.getString("Phone");
            Comment = extras.getString("Comment");
            DateTime = extras.getString("DateTime");
            numberOfPeople = extras.getString("numberOfPeople");
    }

活动不会保留传递的信息android

3 个答案: