Android 如何让notifyDataSetChanged()开始工作?
我试图根据在另一个微调器中选择的项目更改微调器的值。用于填充这两个微调器的值位于名为array的xml文件中。数组文件看起来像Android 如何让notifyDataSetChanged()开始工作?,android,android-arrayadapter,android-spinner,onitemclicklistener,notifydatasetchanged,Android,Android Arrayadapter,Android Spinner,Onitemclicklistener,Notifydatasetchanged,我试图根据在另一个微调器中选择的项目更改微调器的值。用于填充这两个微调器的值位于名为array的xml文件中。数组文件看起来像 <string-array name="eventYear"> <item>2010</item> <item>2010</item> <item>2010</item> </string-array> <strin
<string-array name="eventYear">
<item>2010</item>
<item>2010</item>
<item>2010</item>
</string-array>
<string-array name="eventName">
<item>something</item>
<item>something</item>
<item>something</item>
<item>something</item>
.
.
.
</string-array>
2010
2010
2010
某物
某物
某物
某物
.
.
.
下面是onCreate方法和其他相关代码
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_report_selection);
// Display UI Elements
Log.v("RS", "Displaying Headers and Form");
headerText = (TextView) findViewById(R.id.headerTextView);
subheaderText = (TextView) findViewById(R.id.subHeaderTextView);
headerForm = (LinearLayout) findViewById(R.id.headerForm);
// For Event Year
yearTextView = (TextView) findViewById(R.id.yearTextView);
yearSpinner = (Spinner) findViewById(R.id.yearSpinner);
adapter0 = ArrayAdapter.createFromResource(
ReportSelectionActivity.this, R.array.eventYear,
android.R.layout.simple_spinner_dropdown_item);
adapter0.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
yearSpinner.setAdapter(adapter0);
// When a year is selected change the options in the event name spinner
yearSpinner.setOnItemSelectedListener(new myOnItemSelectedListner());
// For Event Names
nameTextView = (TextView) findViewById(R.id.nameTextView);
nameSpinner = (Spinner) findViewById(R.id.nameSpinner);
ArrayAdapter<CharSequence> adapter1 = ArrayAdapter.createFromResource(
ReportSelectionActivity.this, R.array.plzSelect,
android.R.layout.simple_spinner_dropdown_item);
adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
nameSpinner.setAdapter(adapter1);
// Add table rows to view
yearTableRow = (TableRow) findViewById(R.id.yearTableRow);
nameTableRow = (TableRow) findViewById(R.id.nameTableRow);
}
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u report\u selection);
//显示UI元素
Log.v(“RS”,“显示标题和表单”);
headerText=(TextView)findViewById(R.id.headerTextView);
subheaderText=(TextView)findViewById(R.id.subHeaderTextView);
HeadPerform=(线性布局)findViewById(R.id.HeadPerform);
//活动年
yearTextView=(TextView)findViewById(R.id.yearTextView);
yearSpinner=(微调器)findViewById(R.id.yearSpinner);
adapter0=ArrayAdapter.createFromResource(
ReportSelectionActivity.this,R.array.eventYear,
android.R.layout.simple\u微调器\u下拉菜单\u项);
adapter0.setDropDownViewResource(android.R.layout.simple\u微调器\u下拉菜单\u项);
yearSpinner.setAdapter(适配器0);
//选择年份后,更改事件名称微调器中的选项
yearSpinner.setOnItemSelectedListener(新的MyOnItemSelectedListener());
//对于事件名称
nameTextView=(TextView)findViewById(R.id.nameTextView);
nameSpinner=(微调器)findViewById(R.id.nameSpinner);
ArrayAdapter适配器1=ArrayAdapter.createFromResource(
ReportSelectionActivity.this、R.array.plzSelect、,
android.R.layout.simple\u微调器\u下拉菜单\u项);
adapter1.setDropDownViewResource(android.R.layout.simple\u微调器\u下拉菜单\u项);
nameSpinner.setAdapter(适配器1);
//添加要查看的表行
yearTableRow=(TableRow)findViewById(R.id.yearTableRow);
nameTableRow=(TableRow)findViewById(R.id.nameTableRow);
}
适配器0是一个全局变量
私有类myOnItemSelectedListner实现OnItemSelectedListener{
@凌驾
已选择公共视图(适配器视图arg0、视图arg1、内部arg2、,
长arg3){
//TODO自动生成的方法存根
整数计数=0;
如果(计数>=1){
//TODO自动生成的方法存根
//从微调器中选择年份
int data=Integer.parseInt(yearSpinner.getItemAtPosition(arg2)
.toString());
Log.v(“RS”,“数据:+数据”);
//根据选择的年份,初始化
//新建适配器并将其设置为事件名称微调器
交换机(数据){
案例2010:
adapter0=ArrayAdapter.createFromResource(
ReportSelectionActivity.this,
R.array.eventName2010,
android.R.layout.simple\u微调器\u下拉菜单\u项);
案例2011:
adapter0=ArrayAdapter.createFromResource(
ReportSelectionActivity.this,
R.array.eventName2011,
android.R.layout.simple\u微调器\u下拉菜单\u项);
案例2012:
adapter0=ArrayAdapter.createFromResource(
ReportSelectionActivity.this,
R.array.eventName2012,
android.R.layout.simple\u微调器\u下拉菜单\u项);
违约:
adapter0=ArrayAdapter.createFromResource(
ReportSelectionActivity.this、R.array.plzSelect、,
android.R.layout.simple\u微调器\u下拉菜单\u项);
}
//将适配器添加到微调器
adapter0.setDropDownViewResource(android.R.layout.simple\u微调器\u下拉菜单\u项);
nameSpinner.setAdapter(适配器0);
//更改用户界面视图
adapter0.notifyDataSetChanged();
}//if语句结束
计数++;
}
@凌驾
未选择公共无效(AdapterView arg0){
//TODO自动生成的方法存根
}
}//私有类myOnItemSelectedListener的结束
那么为什么notifyDataSetChanged()不起作用呢
更新代码
私有类myOnItemSelectedListner实现OnItemSelectedListener{
阵列适配器;
字符串[]数组;
@凌驾
已选择公共视图(适配器视图arg0、视图arg1、内部arg2、,
长arg3){
//Log.v(“RS”,“在未选择的情况下”);
//TODO自动生成的方法存根
//整数计数=0;
/*如果(计数>=1){*/
//TODO自动生成的方法存根
//从微调器中选择年份
int数据;
试一试{
data=Integer.parseInt(yearSpinner.getItemAtPosition(arg2)
.toString());
}捕获(数字格式){
数据=0;
}
Log.v(“RS”,“数据:+数据”);
//根据选择的年份,初始化
//新建适配器并将其设置为事件名称微调器
交换机(数据){
案例2010:
Log.v(“RS”,“案例2010”);
适配器1.clear();
array=getResources().getStringArray(R.array.eventName2010);
list=newarraylist(Arrays.asList(array));
适配器1.add((字符序列)
private class myOnItemSelectedListner implements OnItemSelectedListener {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
int count = 0;
if (count >= 1) {
// TODO Auto-generated method stub
// Get the year selected from the spinner
int data = Integer.parseInt(yearSpinner.getItemAtPosition(arg2)
.toString());
Log.v("RS", "Data: " + data);
// Depending on which year has been selected intialize the
// new adapter and set it for the event name spinner
switch (data) {
case 2010:
adapter0 = ArrayAdapter.createFromResource(
ReportSelectionActivity.this,
R.array.eventName2010,
android.R.layout.simple_spinner_dropdown_item);
case 2011:
adapter0 = ArrayAdapter.createFromResource(
ReportSelectionActivity.this,
R.array.eventName2011,
android.R.layout.simple_spinner_dropdown_item);
case 2012:
adapter0 = ArrayAdapter.createFromResource(
ReportSelectionActivity.this,
R.array.eventName2012,
android.R.layout.simple_spinner_dropdown_item);
default:
adapter0 = ArrayAdapter.createFromResource(
ReportSelectionActivity.this, R.array.plzSelect,
android.R.layout.simple_spinner_dropdown_item);
}
// Add adapter to spinner
adapter0.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
nameSpinner.setAdapter(adapter0);
// Change UI view
adapter0.notifyDataSetChanged();
}// End of if statment
count++;
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}// End of private class myOnItemSelectedListener
private class myOnItemSelectedListner implements OnItemSelectedListener {
ArrayAdapter<CharSequence> adapter;
String[] array;
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// Log.v("RS", "In on onItemSelected");
// TODO Auto-generated method stub
// int count = 0;
/* if (count >= 1) { */
// TODO Auto-generated method stub
// Get the year selected from the spinner
int data;
try{
data = Integer.parseInt(yearSpinner.getItemAtPosition(arg2)
.toString());
}catch(NumberFormatException e){
data = 0;
}
Log.v("RS", "Data: " + data);
// Depending on which year has been selected intialize the
// new adapter and set it for the event name spinner
switch (data) {
case 2010:
Log.v("RS", "Case 2010");
adapter1.clear();
array = getResources().getStringArray(R.array.eventName2010);
list = new ArrayList<String>(Arrays.asList(array));
adapter1.add((CharSequence) list);
/*
* = ArrayAdapter.createFromResource(
* ReportSelectionActivity.this, R.array.eventName2010,
* android.R.layout.simple_spinner_dropdown_item)
*/
;
case 2011:
Log.v("RS", "Case 2011");
adapter1.clear();
array = getResources().getStringArray(R.array.eventName2011);
list = new ArrayList<String>(Arrays.asList(array));
adapter1.add((CharSequence) list);
/*
* adapter0 = ArrayAdapter.createFromResource(
* ReportSelectionActivity.this, R.array.eventName2011,
* android.R.layout.simple_spinner_dropdown_item);
*/
case 2012:
Log.v("RS", "Case 2012");
adapter1.clear();
array = getResources().getStringArray(R.array.eventName2012);
list = new ArrayList<String>(Arrays.asList(array));
adapter1.add((CharSequence) list);
/*
* adapter0 = ArrayAdapter.createFromResource(
* ReportSelectionActivity.this, R.array.eventName2012,
* android.R.layout.simple_spinner_dropdown_item);
*/
default:
Log.v("RS", "Case default");
adapter1.clear();
array = getResources().getStringArray(R.array.plzSelect);
list = new ArrayList<String>(Arrays.asList(array));
adapter1.add((CharSequence) list);
/*
* adapter0 = ArrayAdapter.createFromResource(
* ReportSelectionActivity.this, R.array.plzSelect,
* android.R.layout.simple_spinner_dropdown_item);
*/
}
// Add adapter to spinner
adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
nameSpinner.setAdapter(adapter1);
// Change UI view
// Log.v("RS", "notifying view of change");
adapter1.notifyDataSetChanged();
/*
* }// End of if statment
*/
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}// End of private class myOnItemSelectedListener
int count = 0;
if (count >= 1) {
int count = 0;
if (count >= 1) {