这几天学习网上的一个记事本的一个程序，代码写的不错，在Android上如何显示日历呢还能进行手势的识别的功能？首先将效果图贴上：
因为加了GestureDetector的功能当点击的时候会跳转到相应的Activity，鼠标左右滑动可首先类似翻页的效果。
下面是CalenderActivity类，他的view是我们自己实现的CalendarView。
CalendarView calendarView=newCalendarView(this);
setContentView(calendarView);
public class CalendarActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
CalendarView calendarView = new CalendarView(this);
setContentView(calendarView);
}
public void showDiaryList(int year, int month, int day) {
Intent intent = new Intent(this, DiaryList.class);
intent.putExtra("cal", new GregorianCalendar(year, month, day));
startActivity(intent);
}
}
下面是CalenderView类，在这里面绘制了整个日历的界面：
public class CalendarView extends View {
static public class DateRect {
private int x;
private int y;
private int day;
public static int rectSize = 20;
public static int diff = 10;
public DateRect(int x, int y, int day) {
super();
this.x = x;
this.y = y;
this.day = day;
}
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
public int getDay() {
return day;
}
public void setDay(int day) {
this.day = day;
}
public boolean isSelected(float selX, float selY) {
if ((selX >= x - diff && selX <= x + rectSize + diff)
&& (selY >= y - rectSize - diff && selY <= y + diff)) {
return true;
}
return false;
}
}
public static final int INVALID_POSITION = -1;
private int leftPadding = 20;
private int topPadding = 100;
private int rowPadding;
private int colPadding;
private int year;
private int month;
private int day;
private Calendar cal = Calendar.getInstance();
private Calendar today = (Calendar) cal.clone();
private List<DateRect> rects;
private final Paint cPaint;
private final Paint tPaint;
private CalendarActivity calendar;
private GestureDetector mGestureDetector;
public CalendarView(Context context) {
super(context);
calendar = (CalendarActivity) context;
setFocusable(true);
setFocusableInTouchMode(true);
cPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
cPaint.setStyle(Paint.Style.FILL_AND_STROKE);
cPaint.setColor(Color.RED);
cPaint.setTextSize(20f);
tPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
tPaint.setStyle(Paint.Style.FILL_AND_STROKE);
tPaint.setColor(Color.BLACK);
tPaint.setTextSize(20f);
setBackgroundColor(Color.GREEN);
mGestureDetector = new GestureDetector(
new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2,
float velocityX, float velocityY) {
if (e1.getX() > e2.getX()) {
cal.add(Calendar.MONTH, 1);
CalendarView.this.invalidate();
}
if (e1.getX() < e2.getX()) {
cal.add(Calendar.MONTH, -1);
CalendarView.this.invalidate();
}
return true;
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
day = getDay(e.getX(), e.getY());
if (day != INVALID_POSITION) {
calendar.showDiaryList(year, month, day);
}
return true;
}
});
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
colPadding = (w - leftPadding) / 7;
rowPadding = (h - topPadding) / 7;
}
@Override
protected void onDraw(Canvas canvas) {
// Drawing commands go here
year = cal.get(Calendar.YEAR);
month = cal.get(Calendar.MONTH);
String yearMonth = year + "年" + (month + 1) + "月";
canvas.drawText(yearMonth, (colPadding * 7) / 2 - 35, 50, tPaint);
String[] weekStr = new String[] { "一", "二", "三", "四", "五", "六", "日" };
for (int i = 0; i < weekStr.length; i++) {
canvas.drawText(weekStr[i], leftPadding + i * colPadding,
topPadding, tPaint);
}
cal.set(Calendar.DATE, 1);
int month = cal.get(Calendar.MONTH);
int y = 1;
rects = new ArrayList<DateRect>();
while (cal.get(Calendar.MONTH) == month) {
int day = cal.get(Calendar.DATE);
int x = cal.get(Calendar.DAY_OF_WEEK);
if (x == 1) {
x = 7;
} else {
x = x - 1;
}
int dx = leftPadding + (x - 1) * colPadding;
int dy = topPadding + y * rowPadding;
rects.add(new DateRect(dx, dy, day));
if (cal.equals(today)) {
canvas.drawText(day + "", dx, dy, cPaint);
} else {
canvas.drawText(day + "", dx, dy, tPaint);
}
if (x == 7) {
y = y + 1;
}
cal.add(Calendar.DATE, 1);
}
cal.add(Calendar.DATE, -1);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
mGestureDetector.onTouchEvent(event);
return true;
}
private int getDay(float x, float y) {
for (DateRect rect : rects) {
if (rect.isSelected(x, y)) {
return rect.getDay();
}
}
return INVALID_POSITION;
}
}
这样就实现了简单功能的Android日历。
