嘗試繪制自定義視圖如何檢測單擊了哪個切片

Question

我正在創建自定義視圖，就像下面的屏幕。 我可以繪制視圖，但無法為每個視圖創建單獨的點擊事件。 如何為每個圓弧視圖設置單獨的點擊事件？。 提前致謝。

這是代碼：

ArcView.java

public class ItemView extends View {

Utils utils;

int left, right, top, bottom;

private int color;
private int start;
private int sweep;
private boolean inner;
private RectF oval;
public float center_x, center_y;
int divOn;
public float radius;

public ItemView(Context context, int color, int start, int sweep) {
    super(context);
    this.color = color;
    this.start = start;
    this.sweep = sweep;
    utils = Utils.getInstance(getContext());
}

public ItemView(Context context, int color, int start, int sweep, boolean inner, int divOn) {
    super(context);
    this.color = color;
    this.start = start;
    this.sweep = sweep;
    this.inner = inner;
    this.divOn = divOn;
    utils = Utils.getInstance(getContext());
}

public RectF getOval() {
    return oval;
}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    //There is another flag for inner white circle
    if (inner) {
        float width = (float) getWidth();
        float height = utils.getScreenHeight() - utils.getActionBarSize();

        radius = (width - utils.dpTopixel(50)) / divOn;




        Path path = new Path();
        path.addCircle((width - utils.dpTopixel(50)) / divOn,
                (height - utils.dpTopixel(50)) / divOn, radius,
                Path.Direction.CW);

        Paint paint = new Paint();
        paint.setColor(ContextCompat.getColor(getContext(), color));
        paint.setStrokeWidth(5);
        paint.setStyle(Paint.Style.FILL);
        paint.setAntiAlias(true);


        final RectF oval = new RectF();
        paint.setStyle(Paint.Style.FILL);


        left = -(int) radius;
        right = (int) radius;
        top = (getHeight() / 2) - (int) radius;
        bottom = (getHeight() / 2) + (int) radius;

        oval.set(left,
                top,
                right,
                bottom);
        canvas.drawArc(oval, start, sweep, true, paint);
    } else {

        float width = (float) getWidth();
        float height = utils.getScreenHeight() - utils.getActionBarSize();
        float radius;
        radius = (width - utils.dpTopixel(50)) / divOn;

        Path path = new Path();
        path.addCircle((width - utils.dpTopixel(50)) / 1,
                (width - utils.dpTopixel(50)) / 1, radius,
                Path.Direction.CW);

        Paint paint = new Paint();
        paint.setColor(ContextCompat.getColor(getContext(), color));
        paint.setStrokeWidth(5);
        paint.setStyle(Paint.Style.FILL);
        paint.setAntiAlias(true);
        oval = new RectF();
        paint.setStyle(Paint.Style.FILL);



        TextPaint textPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG | Paint.SUBPIXEL_TEXT_FLAG);
        textPaint.setColor(ContextCompat.getColor(getContext(), R.color.white));
        textPaint.setTextAlign(Paint.Align.CENTER);

        /*Paint.FontMetrics metrics = paint.getFontMetrics();
        float textheight = Math.abs(metrics.top - metrics.bottom);
        float x = getWidth() / 2;
        float y = (getHeight() / 2) + (height / 2);

        canvas.drawText("My Text", x, y, paint);*/





        left = -(int) radius;
        right = (int) radius;
        top = (getHeight() / 2) - (int) radius;
        bottom = (getHeight() / 2) + (int) radius;

        center_x = width / 2;
        center_y = utils.getOffset();

        int xPos = (getWidth() / 2);
        int yPos = (int) ((getHeight() / 2) - ((textPaint.descent() + textPaint.ascent()) / 2)) ;
        //((textPaint.descent() + textPaint.ascent()) / 2) is the distance from the baseline to the center.



        oval.set(left,
                top,
                right,
                bottom);
        canvas.drawArc(oval, start, sweep, true, paint);





    }
}

}

utils 類來檢測高度和寬度並轉換為 px

我想要等式來檢查我點擊哪個圓圈

Answer 1

創建切片選擇監聽器，覆蓋onTouchEvent在自定義類，這片觸摸事件（用行動ACTION_UP）計算是使用x，y值。 然后，您可以從切片選定的偵聽器調用該函數並傳遞有關選定切片的詳細信息。