Android8.1 Launcher3 修改PageIndicatorLineCaret为小圆点

原生Launcher的PageIndicatorLineCaret是横线，而且在手指离开屏幕后会消失。
现在修改为小圆点，不消失，先上图：

直接在原有基础上修改
src/com/android/launcher3/pageindicators/PageIndicatorLineCaret.java

增加两个变量：

//当前页面indexprivate int mActivePage;//小圆点画笔private Paint mDotPaint;

初始化：

mDotPaint = new Paint();mDotPaint.setAntiAlias(true);

src/com/android/launcher3/pageindicators/PageIndicatorLineCaret.java -> onDraw():

 @Override    protected void onDraw(Canvas canvas) {        /* 修改 begin *///        if (mTotalScroll == 0 || mNumPagesFloat == 0) {//            return;//        }        // Compute and draw line rect.        /*float progress = Utilities.boundToRange(((float) mCurrentScroll) / mTotalScroll, 0f, 1f);        int availableWidth = canvas.getWidth();        int lineWidth = (int) (availableWidth / mNumPagesFloat);        int lineLeft = (int) (progress * (availableWidth - lineWidth));        int lineRight = lineLeft + lineWidth;        canvas.drawRect(lineLeft, canvas.getHeight() - mLineHeight, lineRight, canvas.getHeight(),                mLinePaint);*/        int lengh = mNumPages * 20 + (mNumPages - 1) * 30;        int x = (getMeasuredWidth() - lengh) / 2;        for (int i = 0; i < mNumPages; i++) {            if (mActivePage == i) {                mDotPaint.setColor(Color.WHITE);            } else {                mDotPaint.setColor(Color.GRAY);            }            canvas.drawCircle(x, getMeasuredHeight() / 2, 10, mDotPaint);            x += 50;        }        /* 修改 end */    }

记录当前所在页面index：

@Override    public void setActiveMarker(int activePage) {        mActivePage = activePage;    }

大功告成！！！

Android8.1 Launcher3 修改PageIndicatorLineCaret为小圆点

Android8.1 Launcher3 修改PageIndicatorLineCaret为小圆点

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