本文介绍了在Android中调用自定义View的onDraw()方法的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经为Calendar创建了一个CustomView.我有一个onDraw方法可在日历中绘制文本.当我单击它时，我想更改文本的颜色.我该如何实现?
I have created a CustomView for Calendar. I have an onDraw method to draw the text in the calendar. I want to change the color of the day Text when i click on it. How can i achieve it?
CalendarView.java:
CalendarView.java :
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 int CALENDAR_WIDTH;
private static int CALENDAR_HEIGHT;
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);
// CALENDAR_HEIGHT = 700;
// CALENDAR_WIDTH = 700;
//
CALENDAR_HEIGHT = (int) res.getDimension(R.dimen.calendar_height);
CALENDAR_WIDTH = (int) res.getDimension(R.dimen.calendar_width);
System.out.println("Width and Hight :"+CALENDAR_WIDTH+" "+CALENDAR_HEIGHT);
System.out.println("Dimen Width and Height : "+R.dimen.calendar_width+" "+R.dimen.calendar_height);
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) {
System.out.println("Width : "+CALENDAR_WIDTH);
System.out.println("Height : "+CALENDAR_HEIGHT);
setMeasuredDimension(CALENDAR_WIDTH, CALENDAR_HEIGHT);
// setMeasuredDimension(100,200);
}
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);
}
}
}
Cell.java:
Cell.java :
package com.example.calendar_module;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.util.Log;
public class Cell {
private static final String TAG = "Cell";
protected Rect mBound = null;
protected int mDayOfMonth = 1; // from 1 to 31
protected Paint mPaint = new Paint(Paint.SUBPIXEL_TEXT_FLAG
|Paint.ANTI_ALIAS_FLAG);
int dx, dy;
protected String mDayString;
private Cell cell ;
public Cell(int dayOfMon, Rect rect, float textSize, boolean bold) {
mDayOfMonth = dayOfMon;
mBound = rect;
mPaint.setTextSize(textSize);
mPaint.setColor(Color.BLACK);
if(bold) mPaint.setFakeBoldText(true);
dx = (int) mPaint.measureText(String.valueOf(mDayOfMonth)) / 2;
dy = (int) (-mPaint.ascent() + mPaint.descent()) / 2;
}
public Cell(String day,Rect rect,float textSize,boolean bold)
{
mDayString = day;
mBound = rect;
mPaint.setTextSize(textSize);
mPaint.setColor(Color.BLACK);
if(bold) mPaint.setFakeBoldText(true);
dx = (int) mPaint.measureText(String.valueOf(mDayString)) / 2;
dy = (int) (-mPaint.ascent() + mPaint.descent()) / 2;
}
public Cell(String day , Rect rect , float textSize , int newColor)
{
mDayString = day;
mBound = rect;
mPaint.setTextSize(textSize);
mPaint.setColor(newColor);
dx = (int) mPaint.measureText(String.valueOf(mDayString)) / 2;
dy = (int) (-mPaint.ascent() + mPaint.descent()) / 2;
}
public Cell(int dayOfMon, Rect rect, float textSize) {
this(dayOfMon, rect, textSize, false);
}
public Cell(String day,Rect rect,float textSize)
{
this(day,rect,textSize,false);
}
protected void draw(Canvas canvas) {
canvas.drawText(String.valueOf(mDayOfMonth), mBound.centerX() - dx, mBound.centerY() + dy, mPaint);
}
public int getDayOfMonth() {
return mDayOfMonth;
}
public boolean hitTest(int x, int y) {
return mBound.contains(x, y);
}
public Rect getBound() {
return mBound;
}
public String toString() {
return String.valueOf(mDayOfMonth)+"("+mBound.toString()+")";
}
}
CalendarActivity.java
CalendarActivity.java
package com.example.calendar_module;
import java.util.GregorianCalendar;
import com.example.calendar_module.CalendarView.OnCellTouchListener;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.Rect;
import android.os.Bundle;
import android.os.Handler;
import android.text.format.DateUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class CalendarActivity extends Activity{
public static final String MIME_TYPE = "vnd.android.cursor.dir/vnd.example.calendar_module.date";
public static String mClickedDate, mClickedMonth;
CalendarView mView = null;
TextView mHit;
Handler mHandler = new Handler();
private Button mNextButton;
private Button mPreviousButton;
private TextView mMonthText ;
private int mMonthInt;
private ListView mEventListView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mView = (CalendarView)findViewById(R.id.calendar);
mEventListView = (ListView) findViewById(R.id.EventsList);
mEventListView.setAdapter(new BadgeAdapter(this));
mView.setOnCellTouchListener(new OnCellTouchListener() {
@Override
public void onTouch(Cell cell) {
TextView mMonthText = (TextView)findViewById(R.id.MonthText);
mClickedDate = ""+cell.getDayOfMonth();
mClickedMonth =""+mMonthText.getText();
// System.out.println("Clicked date is : "+mClickedDate+" "+mClickedMonth);
// startActivity(new Intent(CalendarActivity.this,Event.class));
// cell = new Cell(cell.getDayOfMonth(),new Rect(cell.getBound()),Color.MAGENTA);
}
});
mNextButton = (Button) findViewById(R.id.NextMonth);
mPreviousButton = (Button) findViewById(R.id.PreviousMonth);
mMonthText = (TextView) findViewById(R.id.MonthText);
mMonthText.setText(DateUtils.getMonthString(mView.getMonth(), DateUtils.LENGTH_LONG)+", "+mView.getYear());
// System.out.println("CurrentMonth is : "+mView.getMonth());
// if(getIntent().getAction().equals(Intent.ACTION_PICK))
// findViewById(R.id.hint).setVisibility(View.INVISIBLE);
mNextButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mView.nextMonth();
mMonthText.setText(DateUtils.getMonthString(mView.getMonth(), DateUtils.LENGTH_LONG)+", "+mView.getYear());
}
});
mPreviousButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
mView.previousMonth();
mMonthText.setText(DateUtils.getMonthString(mView.getMonth(), DateUtils.LENGTH_LONG)+", "+mView.getYear());
}
});
System.out.println("Calendar View Height : "+mView.getHeight());
}
private class RedCell extends Cell {
public RedCell(Cell cell) {
super(cell.getDayOfMonth(),new Rect(cell.getBound()), R.dimen.cell_text_size);
mPaint.setColor(Color.RED);
}
}
}
推荐答案
在您的View的onClick()方法中调用mView.invalidate();.这将最终调用onDraw()，然后将为您的视图运行绘图代码.
Call mView.invalidate(); in your onClick() method for that View. This will call onDraw() (eventually), which will then run the drawing code for your view.
这篇关于在Android中调用自定义View的onDraw()方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！