Hi,
I am new to Android development, I have started to learn Java. However
as a beginner I am facing some issues. Here is the problem, your help
will be much appreciated. I started learning Java from and use Hello
android book to teach me some Java coding. Although what I have
learned from book has worked so far, however I tried to incorporate a
extra functionality of date-picker to see how I can use the Android
documentation and apply date picker functionality.
Here are the list of problems I am facing
1. DATE_DIALOG_ID cannot be resolved.
2. mDateDisplay cannot be resolved.
3. mDay cannot be resolved
4. mMonth cannot be resolved.
5. mPickDate cannot be resolved
6. Text view cannot be resolved to a type
7. R.id.display cannot be resolved.
Please help if your time permits. Thank you very much.
package org.example.sudoku;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import java.util.Calendar;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.Toast;
public class sudoku extends Activity implements OnClickListener {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// capture our View elements
mDateDisplay = (TextView) findViewById(R.id.dateDisplay);
mPickDate = (Button) findViewById(R.id.pickDate);
// add a click listener to the button
mPickDate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
showDialog(DATE_DIALOG_ID);
}
});
// get the current date
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
mMonth = c.get(Calendar.MONTH);
mDay = c.get(Calendar.DAY_OF_MONTH);
// display the current date
updateDisplay();
// Set up click listeners for all the buttons
View continueButton = findViewById(R.id.continue_button);
continueButton.setOnClickListener(this);
View newButton = findViewById(R.id.new_button);
newButton.setOnClickListener(this);
View aboutButton = findViewById(R.id.about_button);
aboutButton.setOnClickListener(this);
View exitButton = findViewById(R.id.exit_button);
exitButton.setOnClickListener(this);
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DATE_DIALOG_ID:
return new DatePickerDialog(this,
mDateSetListener,
mYear, mMonth, mDay);
}
return null;
}
// updates the date we display in the TextView
private void updateDisplay() {
mDateDisplay.setText(
new StringBuilder()
// Month is 0 based so add 1
.append(mMonth + 1).append("-")
.append(mDay).append("-")
.append(mYear).append(" "));
}
// the callback received when the user "sets" the date in the
dialog
private DatePickerDialog.OnDateSetListener mDateSetListener =
new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth)
{
mYear = year;
mMonth = monthOfYear;
mDay = dayOfMonth;
updateDisplay();
}
};
// ...
public void onClick(View v) {
switch (v.getId()) {
case R.id.about_button:
Intent i = new Intent(this, About.class);
startActivity(i);
break;
// More buttons go here (if any) ...
}
}
}
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