任何人都可以帮忙，为什么我会得到这个例外!!!
01-15 00:15:51.380 24298-24298/creotive.walleta3 E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at creotive.walleta3.Reminder$5.onDateSet(Reminder.java:290)
at android.app.DatePickerDialog.tryNotifyDateSet(DatePickerDialog.java:199)
at android.app.DatePickerDialog.onClick(DatePickerDialog.java:154)
at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:185)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5306)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)
我的代码是这样的：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.reminder_layout);
editDate=(EditText)findViewById(R.id.edt_date);
setReminderButt = (Button) findViewById(R.id.setReminderButt);
setReminderButt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog = new Dialog(Reminder.this);
dialog.setContentView(R.layout.activity_dialog1);
dialog.setTitle("Reminder Alarm");
editTime=(EditText)findViewById(R.id.edt_time);
setButton=(Button)dialog.findViewById(R.id.btn_set);
date=(Button)dialog.findViewById(R.id.date_picker);
time=(Button)dialog.findViewById(R.id.time_picker);
date.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(Reminder.this, "Reagon", Toast.LENGTH_SHORT).show();
final Calendar c = Calendar.getInstance();
myYear = c.get(Calendar.YEAR);
myMonth = c.get(Calendar.MONTH);
myDay = c.get(Calendar.DAY_OF_MONTH);
showDialog(ID_DATEPICKER);
}
});
time.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final Calendar c = Calendar.getInstance();
myHour = c.get(Calendar.HOUR_OF_DAY);
myMinute = c.get(Calendar.MINUTE);
showDialog(ID_TIMEPICKER);
}
});
setButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
requestCode=(int)System.currentTimeMillis();
try{
msg=editMessage.getText().toString();
}catch (Exception e) {
msg="";
}
dateTime=dateStr.trim()+" "+timeStr.trim();
try {
SimpleDateFormat formatter = new SimpleDateFormat( "dd-MM-yyyy HH:mm" );
setDate=(Date)formatter.parse(dateTime);
} catch (ParseException e){
}
al=new Alarm();
al.SetAlarm(Reminder.this, msg, requestCode, setDate, dateTime);
Toast.makeText(getApplicationContext(), "Alarm has set", Toast.LENGTH_LONG).show();
}
});
dialog.show();
}
});
}
@Override
protected Dialog onCreateDialog(int id) {
// TODO Auto-generated method stub
switch(id){
case ID_DATEPICKER:
return new DatePickerDialog(this,
myDateSetListener,
myYear, myMonth, myDay);
case ID_TIMEPICKER:
return new TimePickerDialog(this,
myTimeSetListener,
myHour, myMinute, false);
default:
return null;
}
}
private DatePickerDialog.OnDateSetListener myDateSetListener
= new DatePickerDialog.OnDateSetListener(){
@Override
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
dateStr=String.valueOf(dayOfMonth)+"-"+String.valueOf(monthOfYear+1)+"-"+String.valueOf(year);
editDate.setText(dateStr);
}
};
private TimePickerDialog.OnTimeSetListener myTimeSetListener
= new TimePickerDialog.OnTimeSetListener(){
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
timeStr=String.valueOf(hourOfDay)+":"+String.valueOf(minute);
editTime.setText(timeStr);
}
};
场景是这样的：我有按钮setReminder，当我点击它时，它会显示能够设置提醒时间和日期的对话框。这个对话框还有两个按钮setTime和setDate，点击每个按钮会抛出这种异常。想知道发生了什么!!!
P.S ---- Reminder.java:290是这行代码：editDate.setText（dateStr）;
答案 0 :(得分：1)
这一行
editTime=(EditText)findViewById(R.id.edt_time);
setContentView() 中夸大的布局时，告诉它查看您使用Dialog虚张声势的布局
将其更改为
editTime=(EditText) dialog.findViewById(R.id.edt_time);