这是Java端。它具有Spinner适配器以及setOnItemClickListener方法。当我评论＆＃34; spTitles＆＃34; setadAdapter方法，程序运行。但是无论我是否评论spCategories setAdapter方法
，程序都会运行import java.util.ArrayList;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.app.TimePickerDialog;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.TimePicker;
import android.widget.Toast;
import com.playmaker.BudgetOh.R;
import com.playmaker.BudgetOh.adapter.CategoriesAdapter;
import com.playmaker.BudgetOh.manager.CategoriesManager;
import com.playmaker.BudgetOh.manager.ExpenseManager;
import com.playmaker.BudgetOh.model.Expense;
public class EditExpense extends Activity implements OnClickListener,
OnItemSelectedListener, OnDateSetListener, OnTimeSetListener {
private Spinner spTitles, spCategories;
;
private String cat_item;
private ArrayList<Expense> allExpenses;
private ArrayList<String> allTitles;
private Expense expense;
private String titlePosition;
private ExpenseManager expenseManager;
private Button btnEditExpenseDate, btnEditExpenseTime, btnAddExpense; //actually modify expense;
private EditText etEditExpenseTitle, etEditExpenseAmount, etEditExpenseComments;
private int mYear, mDay, mMonth, mHour, mMinute;
static final int DATE_DIALOG_ID = 0;
static final int TIME_DIALOG_ID = 1;
private ArrayAdapter<String> catAdapter;
private String title, date, time, amount, category, comment;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit_expense);
init();
allExpenses = expenseManager.getAllExpenses();
for (Expense expense : allExpenses) {
allTitles.add(expense.getTitle());
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_dropdown_item_1line, allTitles);
//Populting the categories
String[] osArray = {"Food and Drinks", "Transportation", "Health", "Leisure", "Other"};
catAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, osArray);
spTitles.setAdapter(adapter);
spCategories.setAdapter(catAdapter);
}
private void init() {
expenseManager = new ExpenseManager(this);
expense = new Expense();
//For Spinners
spTitles = (Spinner) findViewById(R.id.spTitles);
spCategories = (Spinner) findViewById(R.id.spCategories);
//For Buttons
btnEditExpenseTime = (Button) findViewById(R.id.btnEditExpenseTime);
btnEditExpenseDate = (Button) findViewById(R.id.btnEditExpenseDate);
btnAddExpense = (Button) findViewById(R.id.btnModifyExpense);
//For EditText
etEditExpenseTitle = (EditText) findViewById(R.id.etEditExpenseTitle);
etEditExpenseAmount = (EditText) findViewById(R.id.etEditExpenseAmount);
etEditExpenseComments = (EditText) findViewById(R.id.etEditExpenseComments);
//Setting Onclick listeners for all the buttons
btnEditExpenseDate.setOnClickListener(this);
btnEditExpenseTime.setOnClickListener(this);
btnAddExpense.setOnClickListener(this);
spTitles.setOnItemSelectedListener(this);
spCategories.setOnItemSelectedListener(this);
allExpenses = new ArrayList<Expense>();
allTitles = new ArrayList<String>();
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnEditExpenseTime:
showDialog(TIME_DIALOG_ID);
break;
case R.id.btnEditExpenseDate:
showDialog(DATE_DIALOG_ID);
break;
case R.id.btnModifyExpense:
time = btnEditExpenseTime.getText().toString();
date = btnEditExpenseDate.getText().toString();
title = etEditExpenseTitle.getText().toString();
category = cat_item;
amount = etEditExpenseAmount.getText().toString();
comment = etEditExpenseComments.getText().toString();
expense.setTitle(title);
expense.setDate(date);
expense.setTime(time);
expense.setAmount(amount);
expense.setCategory(category);
expense.setComment(comment);
long ret = expenseManager.updateExpense(expense);
if (ret != -1) {
clearFields();
Toast.makeText(getApplicationContext(), "Entry Added"
, Toast
.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), "Failed-Entry"
, Toast
.LENGTH_LONG).show();
}
expenseManager.close();
break;
}
}
private void clearFields() {
etEditExpenseComments.setText("");
etEditExpenseAmount.setText("");
etEditExpenseTitle.setText("");
btnEditExpenseDate.setText("Date");
btnEditExpenseTime.setText("Time");
}
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
mHour = hourOfDay;
mMinute = minute;
updateTime();
}
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
mYear = year;
mMonth = monthOfYear;
mDay = dayOfMonth;
updateDate();
}
private void updateDate() {
this.btnEditExpenseDate.setText(new StringBuilder().append(mMonth + 1).append("-")
.append(mDay).append("-").append(mYear).append(" "));
}
private void updateTime() {
this.btnEditExpenseTime.setText(new StringBuilder().append(mHour).append(":")
.append(mMinute).append(" "));
}
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position,
long arg3) {
switch (arg0.getId()) {
case R.id.spTitles:
titlePosition = allTitles.get(position);
expense = expenseManager.getExpense(titlePosition);
etEditExpenseComments.setText(expense.getComment());
etEditExpenseAmount.setText(expense.getAmount());
etEditExpenseTitle.setText(expense.getTitle());
break;
case R.id.spCategories:
cat_item = arg0.getItemAtPosition(position).toString();
break;
default:
break;
}
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DATE_DIALOG_ID:
return new DatePickerDialog(this, this, mYear, mMonth, mDay);
case TIME_DIALOG_ID:
return new TimePickerDialog(this, this, mHour, mMinute, true);
default:
break;
}
return null;
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
switch (arg0.getId()) {
case R.id.spTitles:
etEditExpenseTitle.setText("");
etEditExpenseAmount.setText("");
etEditExpenseComments.setText("");
break;
default:
break;
}
}
}
这是xml文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.playmaker.BudgetOh.activities.EditExpense">
<Spinner
android:id="@+id/spTitles"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp">
<EditText
android:id="@+id/etEditExpenseTitle"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:ems="10"
android:gravity="center"
android:hint="Expense Title"
android:paddingTop="10dp"></EditText>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<Button
android:id="@+id/btnEditExpenseDate"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.86"
android:text="Date" />
<Button
android:id="@+id/btnEditExpenseTime"
android:layout_width="163dp"
android:layout_height="wrap_content"
android:text="Time" />
</LinearLayout>
<EditText
android:id="@+id/etEditExpenseAmount"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:ems="10"
android:gravity="center"
android:hint="Expense Amount"
android:paddingTop="10dp"></EditText>
<TextView
android:id="@+id/tvCategory"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="15dp"
android:text="@string/CategoriesString"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textSize="25sp"
/>
<Spinner
android:id="@+id/spCategories"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#E3CF57">
</Spinner>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:gravity="center"
android:text="Comments"
android:textSize="25sp" />
<EditText
android:id="@+id/etEditExpenseComments"
android:layout_width="match_parent"
android:layout_height="70dp"
android:ems="10"
android:hint="Please enter you brief comments on your expense"
android:inputType="textMultiLine">
</EditText>
<Button
android:id="@+id/btnModifyExpense"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:text="Add Expense"
android:textSize="20sp" />
<LinearLayout
android:id="@+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="30dp"
android:orientation="horizontal">
<Button
android:id="@+id/action_bar_button_cancel"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="CANCEL" />
<Button
android:id="@+id/action_bar_button_ok"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="OK" />
</LinearLayout>
</LinearLayout>
<requestFocus />
</ScrollView>
</LinearLayout>