Log pos

 D/rihehriiherihihre: i......0.....top..50........bottom......323
 D/rihehriiherihihre: i......1.....top..373........bottom......493
 D/rihehriiherihihre: i......2.....top..543........bottom......663

Code ItemDecoration

/**
* Created by niudong 退款流程節(jié)點(diǎn)狀態(tài)View
*/
public class OrderRefundProcessDecoration extends RecyclerView.ItemDecoration {

// 寫右邊字的畫筆(具體信息)
private Paint mPaint;
// 左 上偏移長度
private int itemView_leftinterval;
private int itemView_topinterval;

// 圖標(biāo)
private final Bitmap mSuccessIcon;
private final Bitmap mProcessCompleteIcon;
private Bitmap mIcon;
private final int mIconWidth;
private final int IMG_W_H = ScreenUtils.dp2px( 17);//


// 在構(gòu)造函數(shù)里進(jìn)行繪制的初始化族购，如畫筆屬性設(shè)置等
public OrderRefundProcessDecoration(Context context) {
    // 軸點(diǎn)畫筆(紅色)
    mPaint = new Paint();
    mPaint.setStrokeWidth(ScreenUtils.dp2px(1.2f));
    mPaint.setAntiAlias(true);
    mPaint.setColor(Color.parseColor("#1FDCC6"));

    // 賦值ItemView的左偏移長度為200
    itemView_leftinterval = ScreenUtils.dp2px(15f);

    // 賦值ItemView的上偏移長度為50
    itemView_topinterval = ScreenUtils.dp2px(19f);

    // 獲取圖標(biāo)資源
    mSuccessIcon = scale(BitmapFactory.decodeResource(context.getResources(), R.drawable.icon_refund_process_success),IMG_W_H,IMG_W_H );
    mProcessCompleteIcon = scale(BitmapFactory.decodeResource(context.getResources(), R.drawable.icon_curr_refund_complete),IMG_W_H,IMG_W_H);

    mIcon = mProcessCompleteIcon;
    mIconWidth = mIcon.getWidth() / 2;
}

// 重寫getItemOffsets（）方法
// 作用：設(shè)置ItemView 左 & 上偏移長度
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
    super.getItemOffsets(outRect, view, parent, state);
    // 設(shè)置ItemView的左 & 上偏移長度分別為200 px & 50px,即此為onDraw()可繪制的區(qū)域
    outRect.set(itemView_leftinterval, view == parent.getChildAt(0) ? itemView_topinterval / 2 : itemView_topinterval, 0, 0);

}

// 重寫onDraw（）
// 作用:在間隔區(qū)域里繪制時(shí)光軸線 & 時(shí)間文本
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
    super.onDraw(c, parent, state);
    // 獲取RecyclerView的Child view的個(gè)數(shù)
    int childCount = parent.getChildCount();
    // 遍歷每個(gè)Item韩脑，分別獲取它們的位置信息谆奥，然后再繪制對應(yīng)的分割線
    for (int i = 0; i < childCount; i++) {
        // 獲取每個(gè)Item對象
        ConstraintLayout constraintLayout = (ConstraintLayout) parent.getChildAt(i);
        boolean isPass = TextUtils.equals("1", (String) constraintLayout.getTag(R.id.order_detail_refund_process));
        processIcon(isPass);
        /**
         * 繪制軸點(diǎn)
         */
        // 軸點(diǎn) = 圓 = 圓心(x,y)
        float centerx = mIconWidth;

        View oneChild = constraintLayout.getChildAt(0);
        int[] location = new int[2];
        oneChild.getLocationInWindow(location);
        float centery = constraintLayout.getTop() + oneChild.getHeight() / 2;

        /**
         * 繪制上半軸線
         */
        float upLine_up_x = centerx;
        float upLine_up_y = 0f;

        // 下端點(diǎn)坐標(biāo)(x,y)
        float upLine_bottom_x = centerx;
        float upLine_bottom_y = centery;
        if (i > 0) {
            //繪制上半部軸線

            processPaintColor(isPass);

            ConstraintLayout childPre = (ConstraintLayout) parent.getChildAt(i - 1);
            upLine_up_y = constraintLayout.getTop() - childPre.getHeight() / 2;
            c.drawLine(upLine_up_x, upLine_up_y, upLine_bottom_x, upLine_bottom_y, mPaint);
        }

        /**
         * 繪制下半軸線
         */

        // 上端點(diǎn)坐標(biāo)(x,y)
        float bottomLine_up_x = centerx;
        float bottom_up_y = centery;

        // 下端點(diǎn)坐標(biāo)(x,y)
        float bottomLine_bottom_x = centerx;
        float bottomLine_bottom_y = constraintLayout.getBottom();

        //繪制下半部軸線
        if (i != childCount - 1) {
            processPaintColor(isPass);
            c.drawLine(bottomLine_up_x, bottom_up_y, bottomLine_bottom_x, bottomLine_bottom_y, mPaint);
        }
        c.drawBitmap(mIcon, centerx - mIconWidth, centery - mIconWidth, mPaint);
    }
}

private void processIcon(boolean isPass) {
    if (isPass) {
        if (mIcon != mProcessCompleteIcon) {
            mIcon = mProcessCompleteIcon;
        }
    } else {
        if (mIcon != mSuccessIcon) {
            mIcon = mSuccessIcon;
        }
    }
}

private void processPaintColor(boolean isPass) {
    if (isPass) {
        if (mPaint.getColor() == Color.parseColor("#DEDEDE")) {
            mPaint.setColor(Color.parseColor("#1FDCC6"));
        }
    } else {
        if (mPaint.getColor() == Color.parseColor("#1FDCC6")) {
            mPaint.setColor(Color.parseColor("#DEDEDE"));
        }
    }
}

/**
 * 縮放圖片
 *
 * @return 縮放后的圖片
 */
public static Bitmap scale(final Bitmap bitmap,
                           final float w,
                           final float h) {

    int width = bitmap.getWidth();
    int height = bitmap.getHeight();
    Matrix matrix = new Matrix();
    float scaleWidht = ((float) w / width);
    float scaleHeight = ((float) h / height);
    /*
     * 通過Matrix類的postScale方法進(jìn)行縮放
     */
    matrix.postScale(scaleWidht, scaleHeight);
    Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
    return newbmp;

}
}