使用方式：
//偷個懶用的像素 沒用dp <ScrollRuleView android:layout_width="match_parent" android:layout_height="200dp" app:count="100"http://配置最大刻度 app:fatLine="10"http://粗線寬 app:thinLine="8"http://細線寬 app:gap="30"http:// app:length="80" > </com.xiaov.ruleview.ScrollRuleView>三角形TriangleView和RuleView封裝在一個ScrollRuleView中，供外部直接使用。
1.draw出來刻度線和三角形。 2.增加跟隨手指移動 3.在move里回調value給上邊顯示當前刻度值。
//畫刻度線 PRotected void onDraw(Canvas canvas) { super.onDraw(canvas); startX= (int)(mPaint.measureText("0")/2);//fix view destroy data exit for (int i = 0; i < count+1; i++) { if(i%10==0){ String text = String.valueOf(i); mPaint.setStrokeWidth(fatLine); canvas.drawLine(startX, 0, startX , 100, mPaint);//line height 100 canvas.drawText(text,startX- mPaint.measureText(text)/2,150, mPaint);//from y 150 }else{ mPaint.setStrokeWidth(thinLine); canvas.drawLine(startX, 0, startX ,60, mPaint);//line height 60 } startX = startX + gap; } }//這里用的屬性動畫移動 layout方式回調后 移動失效public boolean onTouchEvent(MotionEvent event) { int x = (int) event.getX(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: lastX = x; break; case MotionEvent.ACTION_MOVE: float offsetX = x - lastX;// layout(getLeft() + offsetX, getTop() ,getRight() + offsetX, getBottom());//用layout移動的方式 回調給上層View時 move失效 float translationX = getTranslationX() + offsetX; //限制向右滑動 0 if(translationX>= mOffsetRight && mOffsetRight !=0 ){ translationX= mOffsetRight; } //限制向左滑動 100 if(Math.abs(translationX)>=getMeasuredWidth()- mOffsetRight -mPaint.measureText(count+"")/2-mPaint.measureText("0")/2){ translationX=-getMeasuredWidth()+ mOffsetRight +mPaint.measureText(count+"")/2+mPaint.measureText("0")/2; } setTranslationX(translationX); if(mListener!=null){ mListener.onMoveChange(getTranslationX()); } break; case MotionEvent.ACTION_UP: break; } return true;//畫三角形 @Override protected void dispatchDraw(Canvas canvas) { super.dispatchDraw(canvas); mPath.moveTo(getMeasuredWidth()/2-length/2,0); mPath.lineTo(getMeasuredWidth()/2+length/2,0); mPath.lineTo(getMeasuredWidth()/2,length); mPath.close(); mPaint.setStyle(Paint.Style.FILL); canvas.drawPath(mPath, mPaint); }demo地址：https://github.com/androidjiawei/RuleViewDemo
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