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; } }
这样就实现了日历的简单功能。
