Android的文本视图视图、文本、Android
2023-09-04 06:29:57
作者：感性不性感.
我创造的点击事件弹出窗口，里面的弹出窗口有文本视图和按钮...
如果我创建XML的ID和
设置文本 TextView的TXT =（TextView中）findViewById（R.id.text）
txt.setText（信息）;
我得到一个空指针异常。同样的情况对于一个按钮。
下面是我的code
包com.examples;
进口的java.util.ArrayList;
进口的java.util.Calendar;
进口java.util.GregorianCalendar中;
进口的java.util.List;
进口java.util.Locale中;
进口android.app.Activity;
进口android.content.Context;
进口android.content.Intent;
进口android.graphics.Color;
进口android.os.Bundle;
进口android.text.format.DateFormat;
进口android.util.Log;
进口android.view.Gravity;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.view.View.OnClickListener;
进口android.widget.AdapterView;
进口android.widget.BaseAdapter;
进口android.widget.Button;
进口android.widget.GridView;
进口android.widget.ImageView;
进口android.widget.PopupWindow;
进口android.widget.TextView;
进口android.widget.Toast;
进口android.widget.AdapterView.OnItemClickListener;
公共类主要活动扩展实现OnClickListener
{
私人最终的String []月= {一月，二月，月，月，日，月，七五，八五，九五，十月，月， 十二月 };
私有静态最后弦乐标签=主;
私人按钮selectedDayMonthYearButton;
私人按钮currentMonth;
私人ImageView的prevMonth;
私人ImageView的nextMonth;
私人的GridView calendarView;
私人GridCellAdapter适配器;
私人日历_calendar;
私人诠释月，年;
私人最终日期格式dateFormatter =新的日期格式（）;
私有静态最后弦乐dateTemplate =MMMM YYYY;
私人PopupWindow PW;
TextView的TXT1;
静态ViewHolder持有人;
私人无效getRequestParameters（）
{
意向意图= getIntent（）;
如果（意向！= NULL）
{
捆绑额外= intent.getExtras（）;
如果（临时演员！= NULL）
{
如果（临时演员！= NULL）
{
Log.d（标签，+++++ -----------------＆GT;+ extras.getString（PARAMS））;
}
}
}
}
/ **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate（包savedInstanceState）
{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.simple_calendar_view）;
_calendar = Calendar.getInstance（Locale.getDefault（））;
月= _calendar.get（Calendar.MONTH）;
Log.v（月，+月）;
年= _calendar.get（Calendar.YEAR）;
Log.v（年，+年）;
selectedDayMonthYearButton =（按钮）this.findViewById（R.id.selectedDayMonthYear）;
selectedDayMonthYearButton.setText（选择）;
prevMonth =（ImageView的）this.findViewById（R.id. prevMonth）;
prevMonth.setOnClickListener（本）;
currentMonth =（按钮）this.findViewById（R.id.currentMonth）;
currentMonth.setText（dateFormatter.format（dateTemplate，_calendar.getTime（）））;
nextMonth =（ImageView的）this.findViewById（R.id.nextMonth）;
nextMonth.setOnClickListener（本）;
calendarView =（GridView控件）this.findViewById（R.id.calendar）;
//初始化
适配器=新GridCellAdapter（getApplicationContext（），R.id.day_gridcell，月，年）;
adapter.notifyDataSetChanged（）;
calendarView.setAdapter（适配器）;
}
@覆盖
公共无效的onClick（视图v）
{
如果（V = = prevMonth）
{
如果（月＆其中; = 1）
{
月= 11;
年 - ;
} 其他
{
月 - ;
}
适配器=新GridCellAdapter（getApplicationContext（），R.id.day_gridcell，月，年）;
_calendar.set（年，月，_calendar.get（Calendar.DAY_OF_MONTH））;
currentMonth.setText（月[_calendar.get（Calendar.MONTH）] + - + _calendar.get（Calendar.YEAR））;
。//currentMonth.setText(_calendar.getTime（）的toString（））;
adapter.notifyDataSetChanged（）;
calendarView.setAdapter（适配器）;
}
如果（V == nextMonth）
{
如果（月＆GT; = 11）
{
一个月= 0;
今年++;
} 其他
{
一个月++;
}
适配器=新GridCellAdapter（getApplicationContext（），R.id.day_gridcell，月，年）;
_calendar.set（年，月，_calendar.get（Calendar.DAY_OF_MONTH））;
currentMonth.setText（月[_calendar.get（Calendar.MONTH）] + - + _calendar.get（Calendar.YEAR））;
。//currentMonth.setText(_calendar.getTime（）的toString（））;
adapter.notifyDataSetChanged（）;
calendarView.setAdapter（适配器）;
}
}
//内部类
公共类GridCellAdapter扩展了BaseAdapter实现OnClickListener
{
私有静态最后字符串变量=GridCellAdapter;
私人最终语境_context;
私人最终名单，其中，字符串＆GT;清单;
私人最终的String []平日=新的String [] {太阳报，星期一，星期二，星期三，星期四，星期五，星期六};
私人最终诠释[] daysOfMonth = {31，28，31，30，31，30，31，31，30，31，30，31};
私人最终诠释月份，年份;
INT daysInMonth，prevMonthDays;
私人最终诠释currentDayOfMonth;
私人按钮栅格单元;
当月//天
公共GridCellAdapter（上下文的背景下，INT textViewResourceId，INT月，年整型）
{
超（）;
this._context =背景;
this.list =新的ArrayList＆LT;字符串＆GT;（）;
this.month =月;
this.year =年;
Log.d（标签，月：+月++年+一年）;
台历挂历= Calendar.getInstance（）;
currentDayOfMonth = calendar.get（Calendar.DAY_OF_MONTH）;
printMonth（月，年）;
}
公共字符串的getItem（INT位置）
{
返回list.get（位置）;
}
@覆盖
公众诠释getCount将（）
{
返回则为list.size（）;
}
私人无效printMonth（INT毫米，INT日）
{
//天数仍留空白
//这个月的开始。
INT trailingSpaces = 0;
INT leadSpaces = 0;
INT daysIn prevMonth = 0;
INT prevMonth = 0;
INT prevYear = 0;
INT nextMonth = 0;
INT nextYear = 0;
GregorianCalendar的CAL =新的GregorianCalendar（YY，MM，currentDayOfMonth）;
当月//天
daysInMonth = daysOfMonth [毫米]
INT currentMonth =毫米;
如果（currentMonth == 11）
{
prevMonth = 10;
daysIn prevMonth = daysOfMonth [prevMonth]。
nextMonth = 0;
prevYear = YY;
nextYear = YY + 1;
}否则，如果（currentMonth == 0）
{
prevMonth = 11;
prevYear = YY - 1;
nextYear = YY;
daysIn prevMonth = daysOfMonth [prevMonth]。
nextMonth = 1;
} 其他
{
prevMonth = currentMonth - 1;
nextMonth = currentMonth + 1;
nextYear = YY;
prevYear = YY;
daysIn prevMonth = daysOfMonth [prevMonth]。
}
//计算出有多少的第一天之前才离开
// 月。
// getDay（）返回0代表星期日。
trailingSpaces = cal.get（Calendar.DAY_OF_WEEK） - 1;
如果（cal.isLeapYear（cal.get（Calendar.YEAR））及＆安培;毫米== 1）
{
++ daysInMonth;
}
//尾随月天
的for（int i = 0; I＆LT; trailingSpaces;我++）
{
list.add（将String.valueOf（（daysIn prevMonth - trailingSpaces + 1）+ I）+-grey+ - +月[prevMonth〕+ - + prevYear）;
}
//当月天
的for（int i = 1; I＆LT; = daysInMonth;我++）
{
list.add（将String.valueOf（ⅰ）+-WHITE+ - +月[毫米] + - +日）;
}
//领导每月的天数
的for（int i = 0; I＆LT;则为list.size（）％7;我++）
{
Log.d（标签，下个月：=+个月[nextMonth]）;
list.add（将String.valueOf第（i + 1）+-grey+ - +月[nextMonth] + - + nextYear）;
}
}
@覆盖
众长getItemId（INT位置）
{
返回的位置;
}
@覆盖
公共查看getView（INT位置，查看convertView，父母的ViewGroup）
{
Log.d（标签，getView ......）;
查看排= convertView;
如果（行== NULL）
{
// ROW通货膨胀
Log.d（标签，启动XML行通货膨胀......）;
LayoutInflater充气=（LayoutInflater）_context.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
行= inflater.inflate（R.layout.day_gridcell，父母，假）;
Log.d（标签，成功完成XML行通货膨胀！）;
}
//获取一个参考日栅格单元
栅格单元=（按钮）row.findViewById（R.id.day_gridcell）;
gridcell.setOnClickListener（本）;
//占间距
Log.d（标签，当前日期：+ currentDayOfMonth）;
的String [] day_color = list.get（位置）.split（ - ）;
gridcell.setText（day_color [0]）;
gridcell.setTag（day_color [0] + - + day_color [2] + - + day_color [3]）;
如果（day_color [1] .equals（灰色））
{
gridcell.setTextColor（Color.LTGRAY）;
}
如果（day_color [1] .equals（白））
{
gridcell.setTextColor（Color.WHITE）;
}
如果（位置== currentDayOfMonth）
{
gridcell.setTextColor（Color.BLUE）;
}
返回行;
}
@覆盖
公共无效的onClick（视图查看）
{
LayoutInflater充气=（LayoutInflater）Main.this.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
//从相应的XML文件中夸大我们的观点
最后查看布局= inflater.inflate（R.layout.popup，（ViewGroup中）findViewById（R.id.popup_menu_root））;
字符串date_month_year =（字符串）view.getTag（）;
PW =新PopupWindow（布局，200,75，真正的）;
持有人=新ViewHolder（）;
holder.text1 =（TextView中）view.findViewById（R.id.pop_txt）;
//holder.text1.setText("HIIIIIII）;
pw.dismiss（）;
pw.showAtLocation（布局，Gravity.CENTER_VERTICAL，10，30）;
Toast.makeText（getApplicationContext（），date_month_year，Toast.LENGTH_SHORT）.show（）;
selectedDayMonthYearButton.setText（选择：+ date_month_year）;
Log.v（按钮ID，+ R.id.bttn2）;
//layout.setVisibility(View.INVISIBLE）;
// findViewById（R.id.bttn2）.setOnClickListener（
//新OnClickListener（）{
////
//// // LayoutInflater吹气=（LayoutInflater）Main.this.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
//// //夸大我们从相应的XML文件视图
//// //最后查看布局= inflater.inflate（R.layout.popup，（ViewGroup中）findViewById（R.id.popup_menu_root））;
////
////
//// @覆盖
//公共无效的onClick（查看为arg0）{
//// // TODO自动生成方法存根
////// PW =新PopupWindow（布局，200,75，真正的）;
//////
////// pw.dismiss（）;
////// pw.showAtLocation（布局，Gravity.CENTER_VERTICAL，10，30）;
////
//}
//}）;
}
}
静态类ViewHolder {
TextView的文本1;
}
//list.setOnItemClickListener(new OnItemClickListener（）{
}
解决方案
正在调用 findViewById （）在查看得到了点击的，不是你的弹出窗口。
更改此：
holder.text1 =（TextView中）view.findViewById（R.id.pop_txt）;
要：
holder.text1 =（TextView中）pw.findViewById（R.id.pop_txt）;
I am creating a pop up window in click event, inside that pop up window there are text view and Button...
If I create an Id in XML and set the text by
TextView txt=(TextView)findViewById(R.id.text)
txt.setText("Message");
I get a Null pointer Exception. The same happens for a Button..
Here is my code
package com.examples;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.Locale;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.PopupWindow;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class Main extends Activity implements OnClickListener
{
private final String[] months = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
private static final String tag = "Main";
private Button selectedDayMonthYearButton;
private Button currentMonth;
private ImageView prevMonth;
private ImageView nextMonth;
private GridView calendarView;
private GridCellAdapter adapter;
private Calendar _calendar;
private int month, year;
private final DateFormat dateFormatter = new DateFormat();
private static final String dateTemplate = "MMMM yyyy";
private PopupWindow pw;
TextView txt1;
static ViewHolder holder;
private void getRequestParameters()
{
Intent intent = getIntent();
if (intent != null)
{
Bundle extras = intent.getExtras();
if (extras != null)
{
if (extras != null)
{
Log.d(tag, "+++++----------------->" + extras.getString("params"));
}
}
}
}
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.simple_calendar_view);
_calendar = Calendar.getInstance(Locale.getDefault());
month = _calendar.get(Calendar.MONTH);
Log.v("Months", ""+month);
year = _calendar.get(Calendar.YEAR);
Log.v("YEAR", ""+year);
selectedDayMonthYearButton = (Button) this.findViewById(R.id.selectedDayMonthYear);
selectedDayMonthYearButton.setText("Selected: ");
prevMonth = (ImageView) this.findViewById(R.id.prevMonth);
prevMonth.setOnClickListener(this);
currentMonth = (Button) this.findViewById(R.id.currentMonth);
currentMonth.setText(dateFormatter.format(dateTemplate, _calendar.getTime()));
nextMonth = (ImageView) this.findViewById(R.id.nextMonth);
nextMonth.setOnClickListener(this);
calendarView = (GridView) this.findViewById(R.id.calendar);
// Initialised
adapter = new GridCellAdapter(getApplicationContext(), R.id.day_gridcell, month, year);
adapter.notifyDataSetChanged();
calendarView.setAdapter(adapter);
}
@Override
public void onClick(View v)
{
if (v == prevMonth)
{
if (month <= 1)
{
month = 11;
year--;
} else
{
month--;
}
adapter = new GridCellAdapter(getApplicationContext(), R.id.day_gridcell, month, year);
_calendar.set(year, month, _calendar.get(Calendar.DAY_OF_MONTH));
currentMonth.setText(months[_calendar.get(Calendar.MONTH)] + "-" +_calendar.get(Calendar.YEAR));
//currentMonth.setText(_calendar.getTime().toString());
adapter.notifyDataSetChanged();
calendarView.setAdapter(adapter);
}
if (v == nextMonth)
{
if (month >= 11)
{
month = 0;
year++;
} else
{
month++;
}
adapter = new GridCellAdapter(getApplicationContext(), R.id.day_gridcell, month, year);
_calendar.set(year, month, _calendar.get(Calendar.DAY_OF_MONTH));
currentMonth.setText(months[_calendar.get(Calendar.MONTH)] + "-" +_calendar.get(Calendar.YEAR));
//currentMonth.setText(_calendar.getTime().toString());
adapter.notifyDataSetChanged();
calendarView.setAdapter(adapter);
}
}
// Inner Class
public class GridCellAdapter extends BaseAdapter implements OnClickListener
{
private static final String tag = "GridCellAdapter";
private final Context _context;
private final List<String> list;
private final String[] weekdays = new String[] { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
private final int[] daysOfMonth = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
private final int month, year;
int daysInMonth, prevMonthDays;
private final int currentDayOfMonth;
private Button gridcell;
// Days in Current Month
public GridCellAdapter(Context context, int textViewResourceId, int month, int year)
{
super();
this._context = context;
this.list = new ArrayList<String>();
this.month = month;
this.year = year;
Log.d(tag, "Month: " + month + " " + "Year: " + year);
Calendar calendar = Calendar.getInstance();
currentDayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);
printMonth(month, year);
}
public String getItem(int position)
{
return list.get(position);
}
@Override
public int getCount()
{
return list.size();
}
private void printMonth(int mm, int yy)
{
// The number of days to leave blank at
// the start of this month.
int trailingSpaces = 0;
int leadSpaces = 0;
int daysInPrevMonth = 0;
int prevMonth = 0;
int prevYear = 0;
int nextMonth = 0;
int nextYear = 0;
GregorianCalendar cal = new GregorianCalendar(yy, mm, currentDayOfMonth);
// Days in Current Month
daysInMonth = daysOfMonth[mm];
int currentMonth = mm;
if (currentMonth == 11)
{
prevMonth = 10;
daysInPrevMonth = daysOfMonth[prevMonth];
nextMonth = 0;
prevYear = yy;
nextYear = yy + 1;
} else if (currentMonth == 0)
{
prevMonth = 11;
prevYear = yy - 1;
nextYear = yy;
daysInPrevMonth = daysOfMonth[prevMonth];
nextMonth = 1;
} else
{
prevMonth = currentMonth - 1;
nextMonth = currentMonth + 1;
nextYear = yy;
prevYear = yy;
daysInPrevMonth = daysOfMonth[prevMonth];
}
// Compute how much to leave before before the first day of the
// month.
// getDay() returns 0 for Sunday.
trailingSpaces = cal.get(Calendar.DAY_OF_WEEK) - 1;
if (cal.isLeapYear(cal.get(Calendar.YEAR)) && mm == 1)
{
++daysInMonth;
}
// Trailing Month days
for (int i = 0; i < trailingSpaces; i++)
{
list.add(String.valueOf((daysInPrevMonth - trailingSpaces + 1) + i) + "-GREY" + "-" + months[prevMonth] + "-" + prevYear);
}
// Current Month Days
for (int i = 1; i <= daysInMonth; i++)
{
list.add(String.valueOf(i) + "-WHITE" + "-" + months[mm] + "-" + yy);
}
// Leading Month days
for (int i = 0; i < list.size() % 7; i++)
{
Log.d(tag, "NEXT MONTH:= " + months[nextMonth]);
list.add(String.valueOf(i + 1) + "-GREY" + "-" + months[nextMonth] + "-" + nextYear);
}
}
@Override
public long getItemId(int position)
{
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
Log.d(tag, "getView ...");
View row = convertView;
if (row == null)
{
// ROW INFLATION
Log.d(tag, "Starting XML Row Inflation ... ");
LayoutInflater inflater = (LayoutInflater) _context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.day_gridcell, parent, false);
Log.d(tag, "Successfully completed XML Row Inflation!");
}
// Get a reference to the Day gridcell
gridcell = (Button) row.findViewById(R.id.day_gridcell);
gridcell.setOnClickListener(this);
// ACCOUNT FOR SPACING
Log.d(tag, "Current Day: " + currentDayOfMonth);
String[] day_color = list.get(position).split("-");
gridcell.setText(day_color[0]);
gridcell.setTag(day_color[0] + "-" + day_color[2] + "-" + day_color[3]);
if (day_color[1].equals("GREY"))
{
gridcell.setTextColor(Color.LTGRAY);
}
if (day_color[1].equals("WHITE"))
{
gridcell.setTextColor(Color.WHITE);
}
if (position == currentDayOfMonth)
{
gridcell.setTextColor(Color.BLUE);
}
return row;
}
@Override
public void onClick(View view)
{
LayoutInflater inflater = (LayoutInflater) Main.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// inflate our view from the corresponding XML file
final View layout = inflater.inflate(R.layout.popup, (ViewGroup)findViewById(R.id.popup_menu_root));
String date_month_year = (String) view.getTag();
pw = new PopupWindow(layout, 200,75, true);
holder = new ViewHolder();
holder.text1 = (TextView) view.findViewById(R.id.pop_txt);
//holder.text1.setText("HIIIIIII");
pw.dismiss();
pw.showAtLocation(layout, Gravity.CENTER_VERTICAL, 10, 30);
Toast.makeText(getApplicationContext(), date_month_year, Toast.LENGTH_SHORT).show();
selectedDayMonthYearButton.setText("Selected: " + date_month_year);
Log.v("Button ID",""+R.id.bttn2);
//layout.setVisibility(View.INVISIBLE);
// findViewById(R.id.bttn2).setOnClickListener(
// new OnClickListener() {
////
//// //LayoutInflater inflater = (LayoutInflater) Main.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//// // inflate our view from the corresponding XML file
//// // final View layout = inflater.inflate(R.layout.popup, (ViewGroup)findViewById(R.id.popup_menu_root));
////
////
//// @Override
// public void onClick(View arg0) {
//// // TODO Auto-generated method stub
////// pw = new PopupWindow(layout, 200,75, true);
//////
////// pw.dismiss();
////// pw.showAtLocation(layout, Gravity.CENTER_VERTICAL, 10, 30);
////
// }
// });
}
}
static class ViewHolder {
TextView text1;
}
//list.setOnItemClickListener(new OnItemClickListener(){
}
解决方案
You are calling findViewById() on the View that got clicked, not your popup window.
Change this:
holder.text1 = (TextView) view.findViewById(R.id.pop_txt);
To:
holder.text1 = (TextView) pw.findViewById(R.id.pop_txt);
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