项目中用到自定义尺子的样式：
原代码在github上找的，地址：https://github.com/QQabby/HorizontalRuler
原效果为
因为跟自己要使用的view稍有不同 所以做了一些修改，修改的注释都放在代码中了，特此记录一下。
首先是一个自定义View：
1 public class RuleView extends View { 2 3 private Paint paint; 4 5 private Context context; 6 7 private int maxValue = 500; 8 /** 9 * 起点x的坐标 10 */ 11 private float startX ; 12 13 private float startY ; 14 /** 15 * 刻度线的长度 16 */ 17 private float yLenght ; 18 /** 19 * 刻度的间隙 20 */ 21 // private float gap = 8f; 22 private float gap = 10; 23 /** 24 * 文本的间隙 25 */ 26 private float textGap = 10f; 27 /** 28 * 短竖线的高度 29 */ 30 private float smallHeight = 10f; 31 /** 32 * 长竖线的高度 33 */ 34 private float largeHeight = 22f; 35 36 /** 37 * 文本显示格式化 38 */ 39 private DecimalFormat format; 40 41 private DisplayMetrics metrics = null; 42 /** 43 * 文本的字体大小 44 */ 45 private float mFontSize; 46 47 private Handler mScrollHandler = null; 48 49 private MyHorizontalScrollView horizontalScrollView; 50 51 private int mCurrentX = -999999999; 52 /** 53 * 刻度进制 54 */ 55 // private float unit = 10f; 56 private int unit = 10;//隔unit个刻度写一个数字 57 //每个大刻度代表值iValue 58 private int iValue = 10; 59 60 boolean isDraw = true; 61 62 public RuleView(Context context) { 63 super(context); 64 this.context = context; 65 init(); 66 } 67 68 public void setHorizontalScrollView( 69 MyHorizontalScrollView horizontalScrollView) { 70 this.horizontalScrollView = horizontalScrollView; 71 72 this.horizontalScrollView.setOnTouchListener(new OnTouchListener() { 73 74 @Override 75 public boolean onTouch(View v, MotionEvent event) { 76 77 final int action = event.getAction(); 78 switch (action) { 79 case MotionEvent.ACTION_DOWN: 80 81 break; 82 case MotionEvent.ACTION_MOVE: 83 84 mScrollHandler.removeCallbacks(mScrollRunnable); 85 break; 86 case MotionEvent.ACTION_UP: 87 88 mScrollHandler.post(mScrollRunnable); 89 break; 90 } 91 return false; 92 } 93 }); 94 } 95 96 public RuleView(Context context, AttributeSet attrs) { 97 super(context, attrs); 98 this.context = context; 99 100 init();101 }102 103 public void init() {104 105 // format = new DecimalFormat("0.0");106 format = new DecimalFormat("0");//不使用浮点数格式107 108 metrics = new DisplayMetrics();109 WindowManager wmg = (WindowManager) context110 .getSystemService(Context.WINDOW_SERVICE);111 wmg.getDefaultDisplay().getMetrics(metrics);112 113 paint = new Paint(Paint.ANTI_ALIAS_FLAG);114 paint.setStyle(Paint.Style.FILL);115 paint.setStrokeWidth(getResources().getDimension(R.dimen.ui_1_dip));116 // paint.setStrokeWidth(2);117 paint.setColor(Color.parseColor("#999999"));118 119 mFontSize = ScreenUtil.dip2px(context, 16);120 // startY = ScreenUtil.dip2px(context, 20f);121 startY = ScreenUtil.dip2px(context, 0);//Y轴由0开始，即最顶端，不用设置适配布局文件RuleView的android:layout_marginTop="-20dp"122 yLenght = ScreenUtil.dip2px(context, 10);123 // gap = ScreenUtil.dip2px(context, 8f);124 gap = ScreenUtil.dip2px(context, 10);125 // startX = ScreenUtil.getScreenWidth(context)/ 2.0f- getResources().getDimension(R.dimen.ui_10_dip) ;126 startX = ScreenUtil.getScreenWidth(context)/ 2.0f;//X轴不减去10dp，则三角形顶点可以刚好最准0位置127 128 // + getResources().getDimension(R.dimen.text_h2)/2.0f129 // Util.dip2px(context, 13f) +130 131 mScrollHandler = new Handler(context.getMainLooper());132 133 }134 135 @Override136 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {137 138 float width = maxValue * gap + ScreenUtil.getScreenWidth(context) - getResources().getDimension(R.dimen.ui_10_dip)*2.0f ;139 140 // int widthMode = MeasureSpec.getMode(heightMeasureSpec);141 // if(widthMode == MeasureSpec.AT_MOST){142 // Log.d("TAG", "mode::AT_MOST");143 // }else if(widthMode == MeasureSpec.EXACTLY){144 // Log.d("TAG", "mode::EXACTLY");145 // }else if(widthMode == MeasureSpec.UNSPECIFIED){146 // Log.d("TAG", "mode::UNSPECIFIED");147 // }148 149 setMeasuredDimension((int) width, heightMeasureSpec);150 }151 152 @Override153 protected void onDraw(final Canvas canvas) {154 super.onDraw(canvas);155 156 // 画刻度线157 paint.setColor(getResources().getColor(R.color.gray_bg_high));// 刻度颜色158 for (int i = 0; i <= maxValue; i++) {159 160 if (i % 5 == 0) {161 yLenght = ScreenUtil.dip2px(context, largeHeight);162 } else {163 yLenght = ScreenUtil.dip2px(context, smallHeight);164 }165 canvas.drawLine(i * gap + startX, startY, i * gap + startX, yLenght166 + startY, paint);167 }168 169 paint.setTextSize(mFontSize);170 171 // 每10个刻度写一个数字172 textGap = gap * unit;173 174 // 画刻度文字30175 paint.setColor(getResources().getColor(R.color.textGray));// 文字颜色176 for (int i = 0; i <= maxValue / unit; i++) {177 178 // String text = format.format(i + 1) + "";//从0开始计数时不用加1179 String text = format.format(i * iValue) + "";//乘以每刻度的值iValue180 // 获取文本的宽度181 float width = ScreenUtil.px2dip(context, calculateTextWidth(text)) / 2f;182 183 canvas.drawText(184 text,185 startX - width + i * textGap,186 (startY + ScreenUtil.dip2px(context, largeHeight))187 + ScreenUtil.dip2px(context, 24), paint);//字体大小188 }189 }190 191 /**192 * 获取TextView中文本的宽度193 */194 private float calculateTextWidth(String text) {195 if (TextUtils.isEmpty(text)) {196 return 0;197 }198 TextPaint textPaint = new TextPaint();199 textPaint.setTextSize(mFontSize * metrics.scaledDensity);200 final float textWidth = textPaint.measureText(text);201 202 return textWidth;203 }204 205 DecimalFormat df = new DecimalFormat("0.0");206 207 /**208 * 当滑动尺子的时候209 */210 int scrollWidth = 0;211 212 public void setScrollerChanaged(int l, int t, int oldl, int oldt) {213 // 滑动的距离214 scrollWidth = l;215 216 float number = scrollWidth / gap;217 float result = number / unit;218 219 listener.onSlide(result);220 }221 222 public onChangedListener listener;223 224 public interface onChangedListener {225 226 void onSlide(float number);227 }228 229 public void onChangedListener(onChangedListener listener) {230 this.listener = listener;231 }232 233 /**234 * 滚动监听线程235 */236 private Runnable mScrollRunnable = new Runnable() {237 238 @Override239 public void run() {240 if (mCurrentX == horizontalScrollView.getScrollX()) { // 滚动停止了241 242 try {243 244 float x = horizontalScrollView.getScrollX();245 float value = (x / (gap * unit));// 当前的值246 String s = df.format(value);247 248 // 滑动到11.0 ok249 int scrollX = (int) (Double.parseDouble(s) * gap * unit);250 251 horizontalScrollView.smoothScrollTo(scrollX, 0);252 253 } catch (NumberFormatException numExp) {254 numExp.printStackTrace();255 }256 mScrollHandler.removeCallbacks(this);257 } else {258 mCurrentX = horizontalScrollView.getScrollX();259 mScrollHandler.postDelayed(this, 50);260 }261 }262 };263 264 /**265 * 设置默认刻度尺的刻度值,不会滚动到相应的位置266 * 267 * @param scaleValue268 */269 public void setDefaultScaleValue(float scaleValue) {270 271 // final int scrollX = (int) ((scaleValue - 1.0f) * gap * unit);//从0开始计数时不用减去1272 final int scrollX = (int) (scaleValue * gap * unit / 10);//每个值在设置刻度时会乘以10，所以除去273 274 new Handler().postDelayed(new Runnable() {275 276 @Override277 public void run() {278 279 horizontalScrollView.smoothScrollTo(scrollX, 0);280 }281 }, 100);282 }283 284 /**285 * 设置刻度值286 */287 public void setScaleValue(int iValue) {288 this.iValue = iValue;289 }290 291 /**292 * 设置刻度最小值293 */294 public void setMinScaleValue(Float minScaleValue) {295 // this.minScaleValue = minScaleValue;296 }297 298 /**299 * 获取刻度最大值300 */301 public Float getMaxScaleValue() {302 // return maxScaleValue;303 return 33.0f;304 }305 306 /**307 * 设置刻度最大值308 */309 public void setMaxScaleValue(Float maxScaleValue) {310 // this.maxScaleValue = maxScaleValue;311 }312 313 /**314 * 设置当前刻度尺的刻度值,并滚动到相应的位置315 * 316 * @param scaleValue317 */318 public void setScaleScroll(float scaleValue) {319 320 int scrollX = (int) ((scaleValue - 1.0f) * gap * unit);321 322 horizontalScrollView.smoothScrollTo(scrollX, 0);323 }324 } 另外用到一个自定义的scrollView：
1 public class MyHorizontalScrollView extends HorizontalScrollView { 2 3 private OnScrollListener onScrollListener = null; 4 5 public MyHorizontalScrollView(Context context) { 6 this(context, null); 7 } 8 public MyHorizontalScrollView(Context context, AttributeSet attrs) { 9 this(context, attrs, 0);10 }11 public MyHorizontalScrollView(Context context, AttributeSet attrs,12 int defStyleAttr) {13 super(context, attrs, defStyleAttr);14 }15 16 @Override17 protected void onScrollChanged(int l, int t, int oldl, int oldt) {18 super.onScrollChanged(l, t, oldl, oldt);19 if(onScrollListener != null){20 onScrollListener.onScrollChanged(l, t, oldl, oldt);21 }22 }23 24 public interface OnScrollListener {25 public void onScrollChanged(int l, int t, int oldl, int oldt);26 }27 28 public void setOnScrollListener(OnScrollListener onScrollListener) {29 this.onScrollListener = onScrollListener;30 }31 } 直尺上的黄色三角标其实是嵌在布局上的，在drawble文件中实现
下面是布局文件,注意RuleView是嵌在ScrollView中的：
最后在界面中的使用：
ruleView = (RuleView) findViewById(R.id.rule_view); horizontalScrollView = (MyHorizontalScrollView) findViewById(R.id.hor_scrollview); horizontalScrollView.setOverScrollMode(View.OVER_SCROLL_NEVER);// 去掉超出滑动后出现的阴影效果 // 设置水平滑动 ruleView.setHorizontalScrollView(horizontalScrollView); ruleView.setDefaultScaleValue(num); // 当滑动尺子的时候 horizontalScrollView.setOnScrollListener(new MyHorizontalScrollView.OnScrollListener() { @Override public void onScrollChanged(int l, int t, int oldl, int oldt) { ruleView.setScrollerChanaged(l, t, oldl, oldt); } }); ruleView.onChangedListener(new RuleView.onChangedListener() { @Override public void onSlide(float number) { int num = (int) (number * 10); tvNum.setText(num+""); } });