android 实例代码（下） 进阶篇

package net.blogjava.mobile; import java.sql.Date; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.Typeface; import android.graphics.BitmapFactory.Options; import android.graphics.drawable.BitmapDrawable; import android.text.style.StyleSpan; import android.view.View; public class Grid extends CalendarParent { private String[] days = new String[42]; private int dayColor; private int innerGridColor; private int prevNextMonthDayColor; private int currentDayColor; private float daySize; private float dayTopOffset; private float currentDaySize; private float cellX = -1, cellY = -1; private float oldCellX = -1, oldCellY = -1; public void setCellX(float cellX) { oldCellX = this.cellX; this.cellX = cellX; } public void setCellY(float cellY) { oldCellY = this.cellY; this.cellY = cellY; } private int getMonthDays(int year, int month) { switch (month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: { return 31; } case 4: case 6: case 9: case 11: { return 30; } case 2: { if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) return 29; else return 28; } } return 0; } public Grid(Activity activity, View view) { super(activity, view); dayColor = activity.getResources().getColor(R.color.day_color); innerGridColor = activity.getResources().getColor( R.color.inner_grid_color); prevNextMonthDayColor = activity.getResources().getColor( R.color.prev_next_month_day_color); currentDayColor = activity.getResources().getColor( R.color.current_day_color); daySize = activity.getResources().getDimension(R.dimen.day_size); dayTopOffset = activity.getResources().getDimension( R.dimen.day_top_offset); currentDaySize = activity.getResources().getDimension( R.dimen.current_day_size); paint.setColor(activity.getResources().getColor(R.color.border_color)); java.util.Calendar calendar = java.util.Calendar.getInstance(); calendar.set(calendar.get(calendar.YEAR), calendar.get(calendar.MONTH), 1); int week = calendar.get(calendar.DAY_OF_WEEK); int currentMonth = calendar.get(calendar.MONTH); int monthDays = 0; int prevMonthDays = 0; int nextMonthDays = 0; monthDays = getMonthDays(calendar.get(calendar.YEAR), currentMonth); if (currentMonth == 0) prevMonthDays = getMonthDays(calendar.get(calendar.YEAR) - 1, 11); else prevMonthDays = getMonthDays(calendar.get(calendar.YEAR), currentMonth - 1); if (currentMonth == 11) nextMonthDays = getMonthDays(calendar.get(calendar.YEAR) + 1, 0); else prevMonthDays = getMonthDays(calendar.get(calendar.YEAR), currentMonth + 1); for (int i = week, day = prevMonthDays; i > 1; i--, day--) { days[i - 2] = "*" + String.valueOf(day); } for (int day = 1, i = week - 1; day <= monthDays; day++, i++) { days[i] = String.valueOf(day); } for (int i = week + monthDays - 1, day = 1; i < days.length; i++, day++) { days[i] = "*" + String.valueOf(day); } } private boolean isCurrentDay(int dayIndex, int currentDayIndex, Rect cellRect) { if (cellX != -1 && cellY != -1) { if (cellX > cellRect.left && cellX < cellRect.right && cellY > cellRect.top && cellY < cellRect.bottom) { return true; } else { return false; } } else { return dayIndex == currentDayIndex; } } @Override public void draw(Canvas canvas) { float left = borderMargin; float top = borderMargin + weekNameSize + weekNameMargin * 2 + 4; float calendarWidth = view.getMeasuredWidth() - borderMargin * 2; float calendarHeight = view.getMeasuredHeight() - top; float cellWidth = calendarWidth / 7; float cellHeight = calendarHeight / 6; paint.setColor(innerGridColor); canvas.drawLine(left, top, left + view.getMeasuredWidth() - borderMargin * 2, top, paint); // 画横线 for (int i = 1; i < 6; i++) { canvas.drawLine(left, top + (cellHeight - 1) * i, left + calendarWidth, top + (cellHeight - 1) * i, paint); } // 画竖线 for (int i = 1; i < 7; i++) { canvas.drawLine(left + cellWidth * i, top, left + cellWidth * i, view.getMeasuredHeight() - borderMargin, paint); } // 画日期 if (cellX < borderMargin || cellX > (view.getMeasuredWidth() - borderMargin) || cellY < top || cellY > (view.getMeasuredHeight() - borderMargin)) { cellX = oldCellX; cellY = oldCellY; } java.util.Calendar calendar = java.util.Calendar.getInstance(); int day = calendar.get(calendar.DATE); calendar.set(calendar.get(calendar.YEAR), calendar.get(calendar.MONTH), 1); int week = calendar.get(calendar.DAY_OF_WEEK); int currentDayIndex = week + day - 2; boolean flag = false; for (int i = 0; i < days.length; i++) { int row = i / 7; int col = i % 7; String text = String.valueOf(days[i]); if (text.startsWith("*")) { paint.setColor(prevNextMonthDayColor); } else { paint.setColor(dayColor); } text = text.startsWith("*") ? text.substring(1) : text; Rect dst = new Rect(); dst.left = (int) (left + cellWidth * col); dst.top = (int) (top + (cellHeight - 1) * row); dst.bottom = (int) (dst.top + cellHeight); dst.right = (int) (dst.left + cellWidth + 2); paint.setTextSize(daySize); float textLeft = left + cellWidth * col + (cellWidth - paint.measureText(text)) / 2; float textTop = top + (cellHeight - 1) * row + (cellHeight - paint.getTextSize()) / 2 + dayTopOffset; if (isCurrentDay(i, currentDayIndex, dst) && flag == false) { paint.setTextSize(currentDaySize); flag = true; Bitmap bitmap = BitmapFactory.decodeResource(activity .getResources(), R.drawable.day); Rect src = new Rect(); src.left = 0; src.top = 0; src.right = bitmap.getWidth(); src.bottom = bitmap.getHeight(); canvas.drawBitmap(bitmap, src, dst, paint); paint.setColor(currentDayColor); } canvas.drawText(text, textLeft, textTop, paint); } } }