Android DatePicker因NullPointerException而崩溃
目前,我在应用程序中应用了一个Android DatePicker因NullPointerException而崩溃,android,datepicker,Android,Datepicker,目前,我在应用程序中应用了一个日期选择器,当我单击按钮时,它崩溃了。以下是日志: 08-18 00:22:39.564: E/AndroidRuntime(793): FATAL EXCEPTION: main 08-18 00:22:39.564: E/AndroidRuntime(793): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.stts.sparetimetradingsystem/c
日期选择器
,当我单击按钮时,它崩溃了。以下是日志:
08-18 00:22:39.564: E/AndroidRuntime(793): FATAL EXCEPTION: main
08-18 00:22:39.564: E/AndroidRuntime(793): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.stts.sparetimetradingsystem/com.stts.sparetimetradingsystem.employer.EditEventActivity}: java.lang.NullPointerException
08-18 00:22:39.564: E/AndroidRuntime(793): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
08-18 00:22:39.564: E/AndroidRuntime(793): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
08-18 00:22:39.564: E/AndroidRuntime(793): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
08-18 00:22:39.564: E/AndroidRuntime(793): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
08-18 00:22:39.564: E/AndroidRuntime(793): at android.os.Handler.dispatchMessage(Handler.java:99)
08-18 00:22:39.564: E/AndroidRuntime(793): at android.os.Looper.loop(Looper.java:123)
08-18 00:22:39.564: E/AndroidRuntime(793): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-18 00:22:39.564: E/AndroidRuntime(793): at java.lang.reflect.Method.invokeNative(Native Method)
08-18 00:22:39.564: E/AndroidRuntime(793): at java.lang.reflect.Method.invoke(Method.java:521)
08-18 00:22:39.564: E/AndroidRuntime(793): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-18 00:22:39.564: E/AndroidRuntime(793): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-18 00:22:39.564: E/AndroidRuntime(793): at dalvik.system.NativeStart.main(Native Method)
08-18 00:22:39.564: E/AndroidRuntime(793): Caused by: java.lang.NullPointerException
08-18 00:22:39.564: E/AndroidRuntime(793): at com.stts.sparetimetradingsystem.employer.EditEventActivity.updateDisplayFrom(EditEventActivity.java:532)
08-18 00:22:39.564: E/AndroidRuntime(793): at com.stts.sparetimetradingsystem.employer.EditEventActivity.onCreate(EditEventActivity.java:236)
08-18 00:22:39.564: E/AndroidRuntime(793): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-18 00:22:39.564: E/AndroidRuntime(793): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
08-18 00:22:39.564: E/AndroidRuntime(793): ... 11 more
很抱歉没有放置我的代码。这是我的密码:
private int mYear;
private int mMonth;
private int mDay;
static final int DATE_DIALOG_ID = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.edit_event);
edit_eventSpinner = (Spinner) findViewById(R.id.edit_spinner);
btnSaveEvent = (Button) findViewById(R.id.btnSaveEvent);
btnDeleteEvent = (Button) findViewById(R.id.btnDeleteEvent);
edit_error = (TextView) findViewById(R.id.edit_error);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.salary_array,
android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
edit_eventSpinner.setAdapter(adapter);
edit_eventSpinner
.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent,
View view, int position, long id) {
if (position == 0) {
rate = "/hour";
} else if (position == 1) {
rate = "/day";
} else {
rate = "/month";
}
}
public void onNothingSelected(AdapterView<?> parent) {
}
});
// getting event details from intent
Intent i = getIntent();
// getting event id (EID) from intent
eid = i.getStringExtra(TAG_EID);
// Getting complete event details in background thread
new GetEventDetails().execute();
// save button click event
btnSaveEvent.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
// starting background task to update event
String e = edit_eventName.getText().toString();
String c = edit_eventCName.getText().toString();
String s = edit_eventSalary.getText().toString();
String f = edit_eventFrom.getText().toString();
String t = edit_eventTo.getText().toString();
String whf = edit_eventWHFrom.getText().toString();
String wht = edit_eventWHTo.getText().toString();
});
// Delete button click event
btnDeleteEvent.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
// deleting event in background thread
new DeleteEvent().execute();
}
});
Button edit_pickDateFrom = (Button) findViewById(R.id.edit_pickDateFrom);
edit_pickDateFrom.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
showDialog(DATE_DIALOG_ID);
}
});
updateDisplayFrom();
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DATE_DIALOG_ID:
return new DatePickerDialog(this, mDateSetListenerFrom, mYear,
mMonth, mDay);
}
return null;
}
protected void onPrepareDialog(int id, Dialog dialog) {
switch (id) {
case DATE_DIALOG_ID:
((DatePickerDialog) dialog).updateDate(mYear, mMonth, mDay);
break;
}
}
// SET THE DATE FORMAT ALREADY USER SELECT FROM THE DATEPICKER
private void updateDisplayFrom() {
edit_eventFrom.setText(new StringBuilder()
// Month is 0 based so add 1
.append(mDay).append("-").append(mMonth + 1).append("-")
.append(mYear).append(""));
}
private DatePickerDialog.OnDateSetListener mDateSetListenerFrom = new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
mYear = year;
mMonth = monthOfYear;
mDay = dayOfMonth;
updateDisplayFrom();
}
};
private-int-mYear;
私人住宅;
私人国际日;
静态最终整数日期对话框ID=0;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.edit_事件);
edit\u eventSpinner=(Spinner)findviewbyd(R.id.edit\u Spinner);
btnSaveEvent=(按钮)findViewById(R.id.btnSaveEvent);
btnDeleteEvent=(按钮)findViewById(R.id.btnDeleteEvent);
edit_error=(TextView)findViewById(R.id.edit_error);
ArrayAdapter=ArrayAdapter.createFromResource(
这个,R.array.salary\u数组,
android.R.layout.simple\u微调器(项目);
setDropDownViewResource(android.R.layout.simple\u微调器\u下拉菜单\u项);
编辑_eventSpinner.setAdapter(适配器);
编辑事件微调器
.setOnItemSelectedListener(新的OnItemSelectedListener(){
已选择公共无效项(AdapterView父项,
视图、整型位置、长id){
如果(位置==0){
rate=“/小时”;
}否则如果(位置==1){
rate=“/天”;
}否则{
rate=“/月”;
}
}
未选择公共无效(AdapterView父级){
}
});
//从intent获取事件详细信息
Intent i=getIntent();
//从intent获取事件id(EID)
eid=i.getStringExtra(标签eid);
//在后台线程中获取完整的事件详细信息
新建GetEventDetails().execute();
//保存按钮单击事件
btnsaveent.setOnClickListener(新视图.OnClickListener(){
公共void onClick(视图arg0){
//正在启动后台任务以更新事件
字符串e=edit_eventName.getText().toString();
字符串c=edit_eventCName.getText().toString();
字符串s=edit_eventSalary.getText().toString();
字符串f=edit_eventFrom.getText().toString();
字符串t=edit_eventTo.getText().toString();
字符串whf=edit_eventWHFrom.getText().toString();
String wht=edit_eventWHTo.getText().toString();
});
//删除按钮单击事件
btnDeleteEvent.setOnClickListener(新视图.OnClickListener(){
公共void onClick(视图arg0){
//删除后台线程中的事件
新建DeleteEvent().execute();
}
});
Button edit_pickDateFrom=(Button)findViewById(R.id.edit_pickDateFrom);
编辑\u pickDateFrom.setOnClickListener(新视图.OnClickListener(){
公共void onClick(视图v){
showDialog(日期对话框ID);
}
});
updateDisplayFrom();
}
@凌驾
受保护的对话框onCreateDialog(int id){
开关(id){
案例日期\u对话框\u ID:
返回新的DatePickerDialog(this,mDateSetListenerFrom,mYear,
蒙斯(mDay);
}
返回null;
}
受保护的void onPrepareDialog(int id,对话框){
开关(id){
案例日期\u对话框\u ID:
((DatePickerDialog)对话框).updateDate(mYear、Ammonth、mDay);
打破
}
}
//设置用户从日期选择器中选择的日期格式
私有void updateDisplayFrom(){
编辑_eventFrom.setText(新的StringBuilder()
//月份以0为基础,因此添加1
.append(mDay).append(“-”).append(mMonth+1).append(“-”)
.append(mYear)。append(“”);
}
私有DatePickerDialog.OnDateSetListener mDateSetListenerFrom=新建DatePickerDialog.OnDateSetListener(){
公共无效onDateSet(日期选择器视图,整数年,整数月,
整数(每月的第几天){
迈耶=年;
Ammonth=蒙托夫年;
mDay=月的第几天;
updateDisplayFrom();
}
};
下面是我在初始化edit\u eventName等之后得到的新错误
08-18 01:09:56.764: E/AndroidRuntime(977): FATAL EXCEPTION: main
08-18 01:09:56.764: E/AndroidRuntime(977): java.lang.IllegalArgumentException: current should be >= start and <= end
08-18 01:09:56.764: E/AndroidRuntime(977): at android.widget.NumberPicker.setCurrent(NumberPicker.java:288)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.widget.DatePicker.updateDaySpinner(DatePicker.java:364)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.widget.DatePicker.updateSpinners(DatePicker.java:350)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.widget.DatePicker.init(DatePicker.java:346)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.app.DatePickerDialog.<init>(DatePickerDialog.java:124)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.app.DatePickerDialog.<init>(DatePickerDialog.java:83)
08-18 01:09:56.764: E/AndroidRuntime(977): at com.stts.sparetimetradingsystem.employer.EditEventActivity.onCreateDialog(EditEventActivity.java:527)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.app.Activity.onCreateDialog(Activity.java:2472)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.app.Activity.createDialog(Activity.java:881)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.app.Activity.showDialog(Activity.java:2547)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.app.Activity.showDialog(Activity.java:2514)
08-18 01:09:56.764: E/AndroidRuntime(977): at com.stts.sparetimetradingsystem.employer.EditEventActivity$5.onClick(EditEventActivity.java:245)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.view.View.performClick(View.java:2408)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.view.View$PerformClick.run(View.java:8816)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.os.Handler.handleCallback(Handler.java:587)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.os.Handler.dispatchMessage(Handler.java:92)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.os.Looper.loop(Looper.java:123)
08-18 01:09:56.764: E/AndroidRuntime(977): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-18 01:09:56.764: E/AndroidRuntime(977): at java.lang.reflect.Method.invokeNative(Native Method)
08-18 01:09:56.764: E/AndroidRuntime(977): at java.lang.reflect.Method.invoke(Method.java:521)
08-18 01:09:56.764: E/AndroidRuntime(977): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-18 01:09:56.764: E/AndroidRuntime(977): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-18 01:09:56.764: E/AndroidRuntime(977): at dalvik.system.NativeStart.main(Native Method)
08-18 01:09:56.764:E/AndroidRuntime(977):致命异常:main
08-18 01:09:56.764:E/AndroidRuntime(977):java.lang.IllegalArgumentException:current应该是>=start并且似乎您没有从发布的代码中的任何地方初始化编辑事件
您需要从布局中对该视图进行充气,就像您对其他视图进行充气一样:
edit_eventSpinner = (Spinner) findViewById(R.id.edit_spinner);
btnSaveEvent = (Button) findViewById(R.id.btnSaveEvent);
btnDeleteEvent = (Button) findViewById(R.id.btnDeleteEvent);
edit_error = (TextView) findViewById(R.id.edit_error);
正如swayam所提到的,您需要为任何希望在代码中使用的视图执行此操作
斯韦厄姆
同样,在代码中使用之前,初始化以下所有EditText视图
第二个错误
IllegalArgumentException:current应该是>=start,并且您缺少对XML的EditText视图的初始化
EditText edit_eventName = (EditText) findViewById(R.id.idOfThisEditTextInYourXML);
EditText edit_eventFrom = (EditText) findViewById(R.id.idOfThisEditTextInYourXML);
同样,在代码中使用之前,初始化以下所有EditText视图:
edit_eventCName
edit_eventSalary
edit_eventFrom
edit_eventTo
edit_eventWHFrom
edit_eventWHTo
您还缺少mDay、mMonth和mYear
的初始化。您需要为它们分配一些值(整数)
Post EditEventActivity.java:532和周围代码/您需要为我们附加代码以帮助您。在EditEventActivity.java的第532行中,您正在访问一个空引用。我想您忘了将日期选择器充气。我们需要第532行附近的代码。我已上载了我的代码,请查看并告诉我错误在哪里。非常感谢!我初始化了lize已经崩溃了,但当我点击datepicker按钮时仍然崩溃532是PrepareDialogy上受保护的void上方的空格你缺少进一步的初始化。请检查我的更新答案。因为当用户设置日期时,代码将附加日、月、年。然后将作为1个数据存储到我的数据库中。所以你知道如何将它们分离为Individual吗ual数据并存储为mYear、mDay和mMonth?为什么我
private int mYear = 2012; // example value
private int mMonth = 7; // example value
private int mDay =17; // example value