我所拥有的是一个日历小部件，按下后会打开，用户可以从日历中选择日期。我有变量来保存在DateSetup类中输入的日期，我按照代码使用putExtra（）将数据从一个类发送到另一个类，但是值没有显示出来。
应用程序的过程是在选择了日期后，用户将能够选择时间选择器小部件的时间。
在选择了日期和时间之后，将值发送到MySQL数据库，该数据库应显示日期/时间值。仅显示所选时间，但不显示所选日历中的日期。
DateSetup类
public class DateSetup extends MainActivity implements View.OnClickListener
{
//UI References
private EditText fromDateEtxt;
private EditText toDateEtxt;
// Dates Strings setup
String startDate;
String endDate;
DatePickerDialog fromDatePickerDialog;
DatePickerDialog toDatePickerDialog;
private SimpleDateFormat dateFormatter;
private DataDBAdapter2 Database;
Button btnHistory;
Button btnTime;
Button btnFuture;
Button btnManual;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.date_setup);
fromDateEtxt = (EditText) findViewById(R.id.etxt_fromdate);
fromDateEtxt.setInputType(InputType.TYPE_NULL);
fromDateEtxt.requestFocus();
toDateEtxt = (EditText) findViewById(R.id.etxt_todate);
toDateEtxt.setInputType(InputType.TYPE_NULL);
toDateEtxt.requestFocus();
btnTime = (Button)findViewById(R.id.btnSetDates);
btnFuture = (Button)findViewById(R.id.btnFutureSetups);
btnManual = (Button)findViewById(R.id.btnManualControl);
fromDateEtxt.setOnClickListener(this);
toDateEtxt.setOnClickListener(this);
// Open the database
Database = new DataDBAdapter2(this);
Database.open();
// Set the date format to English (Australia)
dateFormatter = new SimpleDateFormat("dd-MM-yyyy", Locale.ENGLISH);
btnHistory = (Button)findViewById(R.id.btnHistoryView);
btnHistory.setOnClickListener(this);
//-------------------------------------------
// Start Date (From date)
//-------------------------------------------
Calendar newCalendar = Calendar.getInstance();
fromDatePickerDialog = new DatePickerDialog(this, new OnDateSetListener()
{
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth)
{
Calendar newDate = Calendar.getInstance();
newDate.set(year, monthOfYear, dayOfMonth);
fromDateEtxt.setText(dateFormatter.format(newDate.getTime()));
//startDate = fromDateEtxt.getText().toString();
}
},newCalendar.get(Calendar.YEAR), newCalendar.get(Calendar.MONTH), newCalendar.get(Calendar.DAY_OF_MONTH));
//-------------------------------------------
// End Date (End date)
//-------------------------------------------
toDatePickerDialog = new DatePickerDialog(this, new OnDateSetListener()
{
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth)
{
Calendar newDate = Calendar.getInstance();
newDate.set(year, monthOfYear, dayOfMonth);
toDateEtxt.setText(dateFormatter.format(newDate.getTime()));
//endDate = toDateEtxt.getText().toString();
}
},newCalendar.get(Calendar.YEAR), newCalendar.get(Calendar.MONTH), newCalendar.get(Calendar.DAY_OF_MONTH));
// Set dates and continue to set times
btnTime.setOnClickListener(new View.OnClickListener()//OnClickListener()
{
@Override
public void onClick(View view)
{
// Start next activity
Intent i = new Intent(DateSetup.this, TimeSetup.class);
// Send data start data and End Date
//i.putExtra("START", startDate);
//i.putExtra("END", endDate);
i.putExtra("START", fromDateEtxt.getText().toString());
i.putExtra("END", toDateEtxt.getText().toString());
//i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
DateSetup.this.startActivity(i);
}
});
// History view
btnHistory.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v2)
{
Intent myIntent2 = new Intent(DateSetup.this, HistoryView.class);
myIntent2.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
DateSetup.this.startActivity(myIntent2);
}
});
// Future Settings View
btnFuture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
Intent myIntent3 = new Intent(DateSetup.this, CurrentView.class);
myIntent3.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
DateSetup.this.startActivity(myIntent3);
}
});
// Manual Control
btnManual.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
Intent myIntent4 = new Intent(DateSetup.this, IrrigationControl.class);
myIntent4.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
DateSetup.this.startActivity(myIntent4);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
//getMenuInflater().inflate(R.menu.date_setup, menu);
//getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
@Override
public void onClick(View view)
{
if(view == fromDateEtxt)
{
fromDatePickerDialog.show();
}
else if(view == toDateEtxt)
{
toDatePickerDialog.show();
}
}
}
TimeSetup2类
public class TimeSetup2 extends TimeSetup
{
Button btnBck;
Button btnSetDatesandTime;
String minutedisplay2;
String hourdisplay2;
private DataDBAdapter2 Database;
private TimePicker timePicker2;
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.time_setup2);
btnBck = (Button) findViewById(R.id.btnBack);
btnSetDatesandTime = (Button) findViewById(R.id.btnSet);
timePicker2 = (TimePicker)findViewById(R.id.timePicker2);
Database = new DataDBAdapter2(this);
Database.open();
// Back to previous activity
// http://stackoverflow.com/questions/4038479/android-go-back-to-previous-activity
btnBck.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
Intent myIntent = new Intent(TimeSetup2.this, TimeSetup.class);
TimeSetup2.this.startActivity(myIntent);
}
});
// Set time and dates
btnSetDatesandTime.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
// Generate random number for ID
Random r = new Random();
int i2 = r.nextInt(100-1) + 100;
// Convert from integer to string
String random2 = Integer.toString(i2);
//------------------------------------------------------
// Data from other classes to be sent to the database
//------------------------------------------------------
Intent intent = getIntent();
// Start Date and End date data
String StartD = intent.getStringExtra("START");
String EndD = intent.getStringExtra("END");
// Time Picker 1 Data (Working)
String StartTime1 = intent.getStringExtra("TIMEHOUR1");
String EndTime1 = intent.getStringExtra("TIMEMIN1");
// Time Picker 2 Data
//String StartTime2 = intent.getStringExtra("TIMEHOUR2");
//String EndTime2 = intent.getStringExtra("TIMEMIN2");
hourdisplay2 = timePicker2.getCurrentHour().toString();
minutedisplay2 = timePicker2.getCurrentMinute().toString();
// Send data to the Database
Database.insertData2(random2, StartD, EndD, StartTime1 + ":" + EndTime1, hourdisplay2 + ":" + minutedisplay2);
// Send data to the arduino board
// Show Message that the data has been sent
Toast.makeText(getApplicationContext(), "Irrigation Setups have been sent", Toast.LENGTH_LONG).show();
}
});
}
}
我一直坚持试图解决这个问题好几天。它可能是非常简单的我错过了，但我无法弄明白。
答案 0 :(得分：0)
唯一适合操作系统的数据类型是基本类型（int，long，float，boolean等），因此这意味着putExtra（）允许您仅存储基元。这就是你无法发送Calendar对象的原因。
尝试将您期间的字符串发送到下一个活动。