Question

我正在制作“日视图”日历应用。我已经使用列表视图创建了空日历，现在需要添加我的约会。

我的光标是全部设置，我可以检索我的约会，只需要在列表视图上绘制它们。棘手的部分是每个列表行是30分钟，我的一些约会可能会更长，几个小时。因此，需要能够指定列表视图中应该绘制约会的位置，即使它当前不在屏幕上。

Answer 1

我做了同样的观点。我开发了自己的CustomView并将其保存在ScrollView中。这个customView的高度是24 * 60 dip。因此，当我们保持倾斜而不是px时，视图的高度将会增加（我希望你知道px和dip之间的差异），宽度将是设备屏幕的宽度。

我无法与您分享完整的代码。但是，可以部分粘贴在这里。这将为您提供处理每件事情的清晰画面。

public class CustomDayView extends View implements OnTouchListener{

    private Paint p;
    private Paint textp;
    private Paint roundRectP;
    private int parentWidth = 0;
    private int parentHeight = 0;
    private int X_OFFSET = 5;
    private int Y_OFFSET = 5;
    private int HOUR_BLOCK_HEIGHT = 60;
    private int font_max_width;
    private ScrollView _scrollView;
    private int least_time_in_hours = 24*60;//6 * 60
    private RectF _rects[];
    private int font_height;
    private Context context;


    public CustomDayEmployeeView(Context context) {
        super(context);
        this.context = context;
        init();
    }
    public CustomDayEmployeeView(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
        init();
    }
    public CustomDayEmployeeView(Context context, AttributeSet attrs,
            int defStyle) {
        super(context, attrs, defStyle);
        this.context = context;
        init();
    }
     private void init(){
         //Creating Paint Objects
     //setting color
         //setting Fonts
         this.setOnTouchListener(this);
     calculateRectValues();
     }

    private void calculateRectValues() {
        // Calculating the Rects to draw in the paint this includes x,y points starting of the rect and width and height of the rectangle.
    int font_max_width = calculate the width needed to draw the hours from 0 to 24 hours;
    for(int i=0;i<no of appts;i++)
        _rects[j] = new RectF(font_max_width, convertTimetoSeconds("09:30"), screenwidth-font_max_width , convertTimetoSeconds("11:30");

    }

    private int convertTimetoSeconds(String _startTime) {
        // TODO Auto-generated method stub
        int total = Integer.parseInt(_startTime.substring(0,_startTime.indexOf(":"))) * 60;
        total += Integer.parseInt(_startTime.substring(_startTime.indexOf(":")+1, _startTime.length()));
        return total;
    }

    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // TODO Auto-generated method stub
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        parentWidth = MeasureSpec.getSize(widthMeasureSpec);
        parentHeight = MeasureSpec.getSize(heightMeasureSpec);
        calculateRectValues();
        setMeasuredDimension(screenwidth,24 * HOUR_BLOCK_HEIGHT);
    }


    public void draw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.draw(canvas);

        for(int i=0;i<25;i++)
        {
            String preString = "";
            String poststring = "";

            if(i == 12)
            {
                preString = "Noon";
                poststring = "";

            }
            else if(i%12 == 0)
            {
                preString = "12";
                poststring = " AM";
            }
            else if(i<12)
            {
                preString = i+"";
                poststring = " AM";
            }
            else
            {
                preString = i%12+"";
                poststring = " PM";
            }
            canvas.drawText(preString, X_OFFSET+3, i * HOUR_BLOCK_HEIGHT + font_height, p);
            canvas.drawText(poststring, X_OFFSET+p.measureText(preString), i * HOUR_BLOCK_HEIGHT + font_height, p);
            p.setTypeface(Typeface.create(Typeface.DEFAULT, Typeface.NORMAL));
            p.setColor(Color.parseColor("#cbcaca"));
            p.setStrokeWidth(0.2f);
            p.setPathEffect(new DashPathEffect(new float[] {1,2}, 0));
            canvas.drawLine(font_max_width, i * (HOUR_BLOCK_HEIGHT)+ font_height/2+HOUR_BLOCK_HEIGHT/2, parentWidth-8, i * (HOUR_BLOCK_HEIGHT)+ font_height/2+HOUR_BLOCK_HEIGHT/2, p);
            p.setColor(Color.parseColor("#f1f1f1"));
            p.setPathEffect(new PathEffect());
            p.setStrokeWidth(0.2f);
            canvas.drawLine(font_max_width, i * HOUR_BLOCK_HEIGHT+ font_height/2, parentWidth-8, i * HOUR_BLOCK_HEIGHT+ font_height/2, p);

        }
            for(int j=0;j<no of appts;j++)
            {
                    canvas.drawRoundRect(_rects[j], 3, 3, roundRectP);
                        canvas.drawText(obj._title, _rects[j].left+X_OFFSET,_rects[j].top + font_height + Y_OFFSET, textp);
            }
        }
    }


    public boolean onTouch(View v, MotionEvent event) {
        // TODO Auto-generated method stub
        int x = (int) event.getX();
        int y = (int) event.getY();
        for(int j=0;j<no of appts;j++)
        {
            if(_rects[j].contains(x, y))
            {
        //Selected J appointmrnt
        }
        }
        return true;
    }
}

我认为这会对你有所帮助。只需创建Object并将ArrayList中的约会传递给此对象的init，然后执行所需的调整。

Answer 2

如果它不在屏幕上，则无需绘制任何内容。

我会以这种方式实现列表适配器：getItem(int position)方法返回每个列表项表示的时间（实际上是时间间隔）。 getView(int position, View convertView, ViewGroup parent)定义哪些约会在给定位置的对应项目的区间内，并根据此信息更新项目的视图。

您可能还需要an endless adapter。

如何在Android中的ListView上绘制形状

2 个答案: