我在Android中使用一个自定义设计的CalendarView。我在布局中使用Scrollview时，自定义设计的CalendarView未显示在屏幕上。
什么可能导致CalendarView消失？
我的布局是：
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/NextMonth"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="@string/NextMonth" />
<Button
android:id="@+id/PreviousMonth"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:text="@string/PreviousMonth" />
<TextView
android:id="@+id/MonthText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="Month" />
<TextView
android:id="@+id/SundayText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/PreviousMonth"
android:layout_marginLeft="25dp"
android:text="@string/SundayText"
android:textSize="10sp" />
<TextView
android:id="@+id/MondayText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/PreviousMonth"
android:layout_marginLeft="22dp"
android:layout_toRightOf="@+id/SundayText"
android:text="@string/MondayText"
android:textSize="10sp" />
<TextView
android:id="@+id/TuesdayText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/PreviousMonth"
android:layout_marginLeft="20dp"
android:layout_toRightOf="@+id/MondayText"
android:text="@string/Tuesday"
android:textSize="10sp" />
<TextView
android:id="@+id/WednesdayText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/PreviousMonth"
android:layout_marginLeft="22dp"
android:layout_toRightOf="@+id/TuesdayText"
android:text="@string/Wednesday"
android:textSize="10sp" />
<TextView
android:id="@+id/Thursday"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/PreviousMonth"
android:layout_marginLeft="20dp"
android:layout_toRightOf="@+id/WednesdayText"
android:text="@string/ThurdayText"
android:textSize="10sp" />
<TextView
android:id="@+id/Friday"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/PreviousMonth"
android:layout_marginLeft="22dp"
android:layout_toRightOf="@+id/Thursday"
android:text="@string/FridayText"
android:textSize="10sp" />
<TextView
android:id="@+id/Saturday"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/PreviousMonth"
android:layout_marginLeft="27dp"
android:layout_toRightOf="@+id/Friday"
android:text="@string/SaturdayText"
android:textSize="10sp" />
<com.example.calendar_module.CalendarView
android:id="@+id/calendar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/NextMonth" />
</RelativeLayout>
</ScrollView>
我的CalenderView类文件：
package com.example.calendar_module;
import java.util.Calendar;
import android.app.ActionBar.LayoutParams;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.MonthDisplayHelper;
import android.view.MotionEvent;
import android.widget.ImageView;
public class CalendarView extends ImageView {
private static int WEEK_TOP_MARGIN = 0;
private static int WEEK_LEFT_MARGIN = 05;
private static int CELL_WIDTH = 20;
private static int CELL_HEIGH = 20;
private static int CELL_MARGIN_TOP = 05;
private static int CELL_MARGIN_LEFT = 29;
private static float CELL_TEXT_SIZE;
private static final String TAG = "CalendarView";
private String[] mDayString = {"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
private Calendar mRightNow = null;
private Drawable mWeekTitle = null;
private Cell mToday = null;
private Cell[][] mCells = new Cell[6][7];
private Cell[] mDayCells = new Cell[7];
private OnCellTouchListener mOnCellTouchListener = null;
MonthDisplayHelper mHelper;
Drawable mDecoration = null;
public interface OnCellTouchListener {
public void onTouch(Cell cell);
}
public CalendarView(Context context) {
this(context, null);
}
public CalendarView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CalendarView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mDecoration = context.getResources().getDrawable(R.drawable.typeb_calendar_today);
initCalendarView();
}
private void initCalendarView() {
mRightNow = Calendar.getInstance();
// prepare static vars
Resources res = getResources();
WEEK_TOP_MARGIN = (int) res.getDimension(R.dimen.week_top_margin);
WEEK_LEFT_MARGIN = (int) res.getDimension(R.dimen.week_left_margin);
CELL_WIDTH = (int) res.getDimension(R.dimen.cell_width);
CELL_HEIGH = (int) res.getDimension(R.dimen.cell_heigh);
CELL_MARGIN_TOP = (int) res.getDimension(R.dimen.cell_margin_top);
CELL_MARGIN_LEFT = (int) res.getDimension(R.dimen.cell_margin_left);
CELL_TEXT_SIZE = res.getDimension(R.dimen.cell_text_size);
// set background
// setImageResource(R.drawable.background);
mWeekTitle = res.getDrawable(R.drawable.calendar_week);
mHelper = new MonthDisplayHelper(mRightNow.get(Calendar.YEAR), mRightNow.get(Calendar.MONTH));
}
private void initCells() {
class _calendar {
public int day;
public boolean thisMonth;
public _calendar(int d, boolean b) {
day = d;
thisMonth = b;
}
public _calendar(int d) {
this(d, false);
}
};
_calendar tmp[][] = new _calendar[6][7];
for(int i=0; i<tmp.length; i++) {
int n[] = mHelper.getDigitsForRow(i);
for(int d=0; d<n.length; d++) {
if(mHelper.isWithinCurrentMonth(i,d))
tmp[i][d] = new _calendar(n[d], true);
else
tmp[i][d] = new _calendar(n[d]);
}
}
Calendar today = Calendar.getInstance();
int thisDay = 0;
mToday = null;
if(mHelper.getYear()==today.get(Calendar.YEAR) && mHelper.getMonth()==today.get(Calendar.MONTH)) {
thisDay = today.get(Calendar.DAY_OF_MONTH);
}
// // build cells
Rect Bound = new Rect(CELL_MARGIN_LEFT, CELL_MARGIN_TOP, CELL_WIDTH+CELL_MARGIN_LEFT, CELL_HEIGH+CELL_MARGIN_TOP);
// for( int i=0 ; i < 7 ; i++ )
// {
//
// mDayCells[i] = new Cell(mDayString[i],new Rect(Bound),CELL_TEXT_SIZE);
// Bound.offset(CELL_WIDTH, 0);
//
// }
//
// Bound.offset(0, CELL_HEIGH); // move to next row and first column
// Bound.left = CELL_MARGIN_LEFT;
// Bound.right = CELL_MARGIN_LEFT+CELL_WIDTH;
//
for(int week=0; week<mCells.length; week++) {
for(int day=0; day<mCells[week].length; day++)
{
if(tmp[week][day].thisMonth) {
if(day==0 || day==6 )
mCells[week][day] = new RedCell(tmp[week][day].day, new Rect(Bound), CELL_TEXT_SIZE);
else
mCells[week][day] = new Cell(tmp[week][day].day, new Rect(Bound), CELL_TEXT_SIZE);
} else {
mCells[week][day] = new GrayCell(tmp[week][day].day, new Rect(Bound), CELL_TEXT_SIZE);
}
Bound.offset(CELL_WIDTH, 0); // move to next column
// get today
if(tmp[week][day].day==thisDay && tmp[week][day].thisMonth) {
mToday = mCells[week][day];
mDecoration.setBounds(mToday.getBound());
}
}
Bound.offset(0, CELL_HEIGH); // move to next row and first column
Bound.left = CELL_MARGIN_LEFT;
Bound.right = CELL_MARGIN_LEFT+CELL_WIDTH;
}
}
@Override
public void onLayout(boolean changed, int left, int top, int right, int bottom) {
// Rect re = getDrawable().getBounds();
// WEEK_LEFT_MARGIN = CELL_MARGIN_LEFT = (right-left - re.width()) / 2;
// mWeekTitle.setBounds(WEEK_LEFT_MARGIN, WEEK_TOP_MARGIN, WEEK_LEFT_MARGIN+mWeekTitle.getMinimumWidth(), WEEK_TOP_MARGIN+mWeekTitle.getMinimumHeight());
initCells();
super.onLayout(changed, left, top, right, bottom);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(CELL_WIDTH, CELL_HEIGH);
}
public void setTimeInMillis(long milliseconds) {
mRightNow.setTimeInMillis(milliseconds);
initCells();
this.invalidate();
}
public int getYear() {
return mHelper.getYear();
}
public int getMonth() {
return mHelper.getMonth();
}
public void nextMonth() {
mHelper.nextMonth();
initCells();
invalidate();
}
public void previousMonth() {
mHelper.previousMonth();
initCells();
invalidate();
}
public boolean firstDay(int day) {
return day==1;
}
public boolean lastDay(int day) {
return mHelper.getNumberOfDaysInMonth()==day;
}
public void goToday() {
Calendar cal = Calendar.getInstance();
mHelper = new MonthDisplayHelper(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH));
initCells();
invalidate();
}
public Calendar getDate() {
return mRightNow;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if(mOnCellTouchListener!=null){
for(Cell[] week : mCells) {
for(Cell day : week) {
if(day.hitTest((int)event.getX(), (int)event.getY())) {
mOnCellTouchListener.onTouch(day);
}
}
}
}
return super.onTouchEvent(event);
}
public void setOnCellTouchListener(OnCellTouchListener p) {
mOnCellTouchListener = p;
}
@Override
protected void onDraw(Canvas canvas) {
// draw background
super.onDraw(canvas);
mWeekTitle.draw(canvas);
// draw cells
for(Cell[] week : mCells) {
for(Cell day : week) {
day.draw(canvas);
}
}
// draw today
if(mDecoration!=null && mToday!=null) {
mDecoration.draw(canvas);
}
}
public class GrayCell extends Cell {
public GrayCell(int dayOfMon, Rect rect, float s) {
super(dayOfMon, rect, s);
mPaint.setColor(Color.LTGRAY);
}
}
private class RedCell extends Cell {
public RedCell(int dayOfMon, Rect rect, float s) {
super(dayOfMon, rect, s);
mPaint.setColor(0xdddd0000);
}
}
}
答案 0 :(得分：0)
我认为，您的自定义height的{{1}}等于== 0.尝试记录它。如果它是正确的，只需覆盖view并设置onMeasure的大小。
并且esle：为什么在xml view？你能想象它在height == match_parent中的样子吗？）
UPD：好的，在您的情况下ScrollView。您的自定义height == 0中必须使用override onMeasure()方法，如下所示：
view宽度和高度值，以像素为单位。
祝你好运！