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Android自定義柱狀圖表的方法實例

前言

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本文將通過示例代碼介紹如何自定義簡單的直方圖表，此圖表并非常見的直方圖表，而是可以分組的。此文不會過多涉及原理，比較簡單，示例圖片如下(gif圖片沒有制作好，有閃爍，請見諒)：

Android自定義柱狀圖表的方法實例

對于該示例的代碼實現(xiàn)，其實重點在于坐標軸、文字、直方圖的位置控制，需要隨滑動距離而動態(tài)更新。注意事項會在示例代碼中標注。下面貼出示例代碼

public class MultiGroupHistogramView extends View {
 private int width;
 private int height;
 // 坐標軸線寬度
 private int coordinateAxisWidth;

 // 組名稱字體大小
 private int groupNameTextSize;
 // 小組之間間距
 private int groupInterval;
 // 組內(nèi)子直方圖間距
 private int histogramInterval;
 private int histogramValueTextSize;
 // 圖表數(shù)值小數(shù)點位數(shù)
 private int histogramValueDecimalCount;
 private int histogramHistogramWidth;
 private int chartPaddingTop;
 private int histogramPaddingStart;
 private int histogramPaddingEnd;
 // 各組名稱到X軸的距離
 private int distanceFormGroupNameToAxis;
 // 直方圖上方數(shù)值到直方圖的距離
 private int distanceFromValueToHistogram;

 // 直方圖最大高度
 private int maxHistogramHeight;
 // 軸線畫筆
 private Paint coordinateAxisPaint;
 // 組名畫筆
 private Paint groupNamePaint;
 private Paint.FontMetrics groupNameFontMetrics;
 private Paint.FontMetrics histogramValueFontMetrics;
 // 直方圖數(shù)值畫筆
 private Paint histogramValuePaint;
 // 直方圖畫筆
 private Paint histogramPaint;
 // 直方圖繪制區(qū)域
 private Rect histogramPaintRect;
 // 直方圖表視圖總寬度
 private int histogramContentWidth;
 // 存儲組內(nèi)直方圖shader color，例如，每組有3個直方圖，該SparseArray就存儲3個相對應的shader color
 private SparseArray<int[]> histogramShaderColorArray;

 private List<MultiGroupHistogramGroupData> dataList;
 private SparseArray<Float> childMaxValueArray;

 private Scroller scroller;
 private int minimumVelocity;
 private int maximumVelocity;
 private VelocityTracker velocityTracker;

 public MultiGroupHistogramView(Context context) {
  this(context, null);
 }

 public MultiGroupHistogramView(Context context, @Nullable AttributeSet attrs) {
  this(context, attrs, 0);
 }

 public MultiGroupHistogramView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  init(attrs);
 }

 private void init(AttributeSet attrs) {
  setLayerType(View.LAYER_TYPE_HARDWARE, null);
  TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.MultiGroupHistogramView);
  coordinateAxisWidth = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_coordinateAxisWidth, DisplayUtil.dp2px(2));
  // 坐標軸線顏色
  int coordinateAxisColor = typedArray.getColor(R.styleable.MultiGroupHistogramView_coordinateAxisColor, Color.parseColor("#434343"));
  // 底部小組名稱字體顏色
  int groupNameTextColor = typedArray.getColor(R.styleable.MultiGroupHistogramView_groupNameTextColor, Color.parseColor("#CC202332"));
  groupNameTextSize = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_groupNameTextSize, DisplayUtil.dp2px(15));
  groupInterval = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_groupInterval, DisplayUtil.dp2px(30));
  histogramInterval = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_histogramInterval, DisplayUtil.dp2px(10));
  // 直方圖數(shù)值文本顏色
  int histogramValueTextColor = typedArray.getColor(R.styleable.MultiGroupHistogramView_histogramValueTextColor, Color.parseColor("#CC202332"));
  histogramValueTextSize = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_histogramValueTextSize, DisplayUtil.dp2px(12));
  histogramValueDecimalCount = typedArray.getInt(R.styleable.MultiGroupHistogramView_histogramValueDecimalCount, 0);
  histogramHistogramWidth = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_histogramHistogramWidth, DisplayUtil.dp2px(20));
  chartPaddingTop = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_chartPaddingTop, DisplayUtil.dp2px(10));
  histogramPaddingStart = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_histogramPaddingStart, DisplayUtil.dp2px(15));
  histogramPaddingEnd = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_histogramPaddingEnd, DisplayUtil.dp2px(15));
  distanceFormGroupNameToAxis = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_distanceFormGroupNameToAxis, DisplayUtil.dp2px(15));
  distanceFromValueToHistogram = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_distanceFromValueToHistogram, DisplayUtil.dp2px(10));
  typedArray.recycle();

  coordinateAxisPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  coordinateAxisPaint.setStyle(Paint.Style.FILL);
  coordinateAxisPaint.setStrokeWidth(coordinateAxisWidth);
  coordinateAxisPaint.setColor(coordinateAxisColor);

  groupNamePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  groupNamePaint.setTextSize(groupNameTextSize);
  groupNamePaint.setColor(groupNameTextColor);
  groupNameFontMetrics = groupNamePaint.getFontMetrics();

  histogramValuePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  histogramValuePaint.setTextSize(histogramValueTextSize);
  histogramValuePaint.setColor(histogramValueTextColor);
  histogramValueFontMetrics = histogramValuePaint.getFontMetrics();

  histogramPaintRect = new Rect();
  histogramPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  scroller = new Scroller(getContext(), new LinearInterpolator());
  ViewConfiguration configuration = ViewConfiguration.get(getContext());
  minimumVelocity = configuration.getScaledMinimumFlingVelocity();
  maximumVelocity = configuration.getScaledMaximumFlingVelocity();
 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  width = getMeasuredWidth();
  height = getMeasuredHeight();
  maxHistogramHeight = height - groupNameTextSize - coordinateAxisWidth - distanceFormGroupNameToAxis - distanceFromValueToHistogram - histogramValueTextSize - chartPaddingTop;
 }

 /**
  * 判斷是否可以水平滑動
  * @param direction 標識滑動方向 正數(shù)：右滑(手指從右至左移動)；負數(shù)：左滑(手指由左向右移動)
  * 您可參考ScaollView或HorizontalScrollView理解滑動方向
  */
 @Override
 public boolean canScrollHorizontally(int direction) {
  if (direction > 0) {
   return histogramContentWidth - getScrollX() - width + histogramPaddingStart + histogramPaddingEnd > 0;
  } else {
   return getScrollX() > 0;
  }
 }

 /**
  * 根據(jù)滑動方向獲取最大可滑動距離
  * @param direction 標識滑動方向 正數(shù)：右滑(手指從右至左移動)；負數(shù)：左滑(手指由左向右移動)
  * 您可參考ScaollView或HorizontalScrollView理解滑動方向
  */
 private int getMaxCanScrollX(int direction) {
  if (direction > 0) {
   return histogramContentWidth - getScrollX() - width + histogramPaddingStart + histogramPaddingEnd > 0 ?
     histogramContentWidth - getScrollX() - width + histogramPaddingStart + histogramPaddingEnd : 0;
  } else if (direction < 0) {
   return getScrollX();
  }
  return 0;
 }

 private float lastX;

 @Override
 public boolean onTouchEvent(MotionEvent event) {
  initVelocityTrackerIfNotExists();
  velocityTracker.addMovement(event);
  switch (event.getAction()) {
   case MotionEvent.ACTION_DOWN: {
    if (!scroller.isFinished()) {
     scroller.abortAnimation();
    }
    lastX = event.getX();
    return true;
   }
   case MotionEvent.ACTION_MOVE: {
    int deltaX = (int) (event.getX() - lastX);
    lastX = event.getX();
    // 滑動處理
    if (deltaX > 0 && canScrollHorizontally(-1)) {
     scrollBy(-Math.min(getMaxCanScrollX(-1), deltaX), 0);
    } else if (deltaX < 0 && canScrollHorizontally(1)) {
     scrollBy(Math.min(getMaxCanScrollX(1), -deltaX), 0);
    }
    break;
   }
   case MotionEvent.ACTION_UP: {
    velocityTracker.computeCurrentVelocity(1000, maximumVelocity);
    int velocityX = (int) velocityTracker.getXVelocity();
    fling(velocityX);
    recycleVelocityTracker();
    break;
   }
   case MotionEvent.ACTION_CANCEL: {
    recycleVelocityTracker();
    break;
   }
  }
  return super.onTouchEvent(event);
 }

 private void initVelocityTrackerIfNotExists() {
  if (velocityTracker == null) {
   velocityTracker = VelocityTracker.obtain();
  }
 }

 private void recycleVelocityTracker() {
  if (velocityTracker != null) {
   velocityTracker.recycle();
   velocityTracker = null;
  }
 }

 // ACTION_UP事件觸發(fā)
 private void fling(int velocityX) {
  if (Math.abs(velocityX) > minimumVelocity) {
   if (Math.abs(velocityX) > maximumVelocity) {
    velocityX = maximumVelocity * velocityX / Math.abs(velocityX);
   }
   scroller.fling(getScrollX(), getScrollY(), -velocityX, 0, 0, histogramContentWidth + histogramPaddingStart - width, 0, 0);
  }
 }

 @Override
 public void computeScroll() {
  if (scroller.computeScrollOffset()) {
   scrollTo(scroller.getCurrX(), 0);
  }
 }

 public void setDataList(@NonNull List<MultiGroupHistogramGroupData> dataList) {
  this.dataList = dataList;
  if (childMaxValueArray == null) {
   childMaxValueArray = new SparseArray<>();
  } else {
   childMaxValueArray.clear();
  }
  histogramContentWidth = 0;
  for (MultiGroupHistogramGroupData groupData : dataList) {
   List<MultiGroupHistogramChildData> childDataList = groupData.getChildDataList();
   if (childDataList != null && childDataList.size() > 0) {
    for (int i = 0; i < childDataList.size(); i++) {
     histogramContentWidth += histogramHistogramWidth + histogramInterval;
     MultiGroupHistogramChildData childData = childDataList.get(i);
     Float childMaxValue = childMaxValueArray.get(i);
     if (childMaxValue == null || childMaxValue < childData.getValue()) {
      childMaxValueArray.put(i, childData.getValue());
     }
    }
    histogramContentWidth += groupInterval - histogramInterval;
   }
  }
  histogramContentWidth += -groupInterval;
 }

 /**
  * 設置組內(nèi)直方圖顏色(并不是設置所有直方圖顏色，而是根據(jù)每組數(shù)據(jù)內(nèi)直方圖數(shù)量設置)
  */
 public void setHistogramColor(int[]... colors) {
  if (colors != null && colors.length > 0) {
   if (histogramShaderColorArray == null) {
    histogramShaderColorArray = new SparseArray<>();
   } else {
    histogramShaderColorArray.clear();
   }
   for (int i = 0; i < colors.length; i++) {
    histogramShaderColorArray.put(i, colors[i]);
   }
  }
 }

 @Override
 protected void onDraw(Canvas canvas) {
  if (width == 0 || height == 0) {
   return;
  }
  int scrollX = getScrollX();
  int axisBottom = height - groupNameTextSize - distanceFormGroupNameToAxis - coordinateAxisWidth / 2;
  canvas.drawLine(coordinateAxisWidth / 2 + scrollX, 0, coordinateAxisWidth / 2 + scrollX, axisBottom, coordinateAxisPaint);
  canvas.drawLine(scrollX, axisBottom, width + scrollX, axisBottom, coordinateAxisPaint);
  if (dataList != null && dataList.size() > 0) {
   int xAxisOffset = histogramPaddingStart; // 每個直方圖在x軸的偏移量
   for (MultiGroupHistogramGroupData groupData : dataList) {
    List<MultiGroupHistogramChildData> childDataList = groupData.getChildDataList();
    if (childDataList != null && childDataList.size() > 0) {
     int groupWidth = 0;
     for (int i = 0; i < childDataList.size(); i++) {
      MultiGroupHistogramChildData childData = childDataList.get(i);
      histogramPaintRect.left = xAxisOffset;
      histogramPaintRect.right = histogramPaintRect.left + histogramHistogramWidth;
      int childHistogramHeight;
      if (childData.getValue() <= 0 || childMaxValueArray.get(i) <= 0) {
       childHistogramHeight = 0;
      } else {
       childHistogramHeight = (int) (childData.getValue() / childMaxValueArray.get(i) * maxHistogramHeight);
      }
      histogramPaintRect.top = height - childHistogramHeight - coordinateAxisWidth - distanceFormGroupNameToAxis - groupNameTextSize;
      histogramPaintRect.bottom = histogramPaintRect.top + childHistogramHeight;
      int[] histogramShaderColor = histogramShaderColorArray.get(i);
      LinearGradient shader = null;
      if (histogramShaderColor != null && histogramShaderColor.length > 0) {
       shader = getHistogramShader(histogramPaintRect.left, chartPaddingTop + distanceFromValueToHistogram + histogramValueTextSize,
         histogramPaintRect.right, histogramPaintRect.bottom, histogramShaderColor);
      }
      histogramPaint.setShader(shader);
      canvas.drawRect(histogramPaintRect, histogramPaint);
      String childHistogramHeightValue = StringUtil.NumericScaleByFloor(String.valueOf(childData.getValue()), histogramValueDecimalCount) + childData.getSuffix();

      float valueTextX = xAxisOffset + (histogramHistogramWidth - histogramValuePaint.measureText(childHistogramHeightValue)) / 2;
      // 數(shù)值繪制Y軸位置特別處理
      float valueTextY = histogramPaintRect.top - distanceFormGroupNameToAxis + (histogramValueFontMetrics.bottom) / 2;
      canvas.drawText(childHistogramHeightValue, valueTextX, valueTextY, histogramValuePaint);
      int deltaX = i < childDataList.size() - 1 ? histogramHistogramWidth + histogramInterval : histogramHistogramWidth;
      groupWidth += deltaX;
      // 注意此處偏移量累加
      xAxisOffset += i == childDataList.size() - 1 ? deltaX + groupInterval : deltaX;
     }
     String groupName = groupData.getGroupName();
     float groupNameTextWidth = groupNamePaint.measureText(groupName);
     float groupNameTextX = xAxisOffset - groupWidth - groupInterval + (groupWidth - groupNameTextWidth) / 2;
     // 組名繪制Y軸位置特別處理
     float groupNameTextY = (height - groupNameFontMetrics.bottom / 2);
     canvas.drawText(groupName, groupNameTextX, groupNameTextY, groupNamePaint);
    }
   }
  }
 }

 private LinearGradient getHistogramShader(float x0, float y0, float x1, float y1, int[] colors) {
  return new LinearGradient(x0, y0, x1, y1, colors, null, Shader.TileMode.CLAMP);
 }
}

代碼就這一點，閱讀起來應該不難，如有疑問歡迎留言

自定義屬性如下：

 <declare-styleable name="MultiGroupHistogramView">
  <attr name="coordinateAxisWidth" format="dimension" />
  <attr name="coordinateAxisColor" format="color" />
  <attr name="groupNameTextColor" format="color" />
  <attr name="groupNameTextSize" format="dimension" />
  <attr name="groupInterval" format="dimension" />
  <attr name="histogramInterval" format="dimension" />
  <attr name="histogramValueTextColor" format="color" />
  <attr name="histogramValueTextSize" format="dimension" />
  <attr name="histogramHistogramWidth" format="dimension" />
  <attr name="histogramPaddingStart" format="dimension" />
  <attr name="histogramPaddingEnd" format="dimension" />
  <attr name="chartPaddingTop" format="dimension" />
  <attr name="distanceFormGroupNameToAxis" format="dimension" />
  <attr name="distanceFromValueToHistogram" format="dimension" />
  <!--圖表數(shù)值小數(shù)點位數(shù)-->
  <attr name="histogramValueDecimalCount">
   <enum name="ZERO" value="0" />
   <enum name="ONE" value="1" />
   <enum name="TWO" value="2" />
  </attr>
 </declare-styleable>

下面貼出使用方法：

 private void initMultiGroupHistogramView() {
  Random random = new Random();
  int groupSize = random.nextInt(5) + 10;
  List<MultiGroupHistogramGroupData> groupDataList = new ArrayList<>();
  // 生成測試數(shù)據(jù) 
  for (int i = 0; i < groupSize; i++) {
   List<MultiGroupHistogramChildData> childDataList = new ArrayList<>();
   MultiGroupHistogramGroupData groupData = new MultiGroupHistogramGroupData();
   groupData.setGroupName("第" + (i + 1) + "組");
   MultiGroupHistogramChildData childData1 = new MultiGroupHistogramChildData();
   childData1.setSuffix("分");
   childData1.setValue(random.nextInt(50) + 51);
   childDataList.add(childData1);

   MultiGroupHistogramChildData childData2 = new MultiGroupHistogramChildData();
   childData2.setSuffix("%");
   childData2.setValue(random.nextInt(50) + 51);
   childDataList.add(childData2);
   groupData.setChildDataList(childDataList);
   groupDataList.add(groupData);
  }
  multiGroupHistogramView.setDataList(groupDataList);
  int[] color1 = new int[]{getResources().getColor(R.color.color_orange), getResources().getColor(R.color.colorPrimary)};

  int[] color2 = new int[]{getResources().getColor(R.color.color_supper_tip_normal), getResources().getColor(R.color.bg_supper_selected)};
  // 設置直方圖顏色
  multiGroupHistogramView.setHistogramColor(color1, color2);
 }

完整示例：https://github.com/670832188/TestApp (本地下載)

Android自定義柱狀圖表的方法實例

總結(jié)

以上就是這篇文章的全部內(nèi)容了，希望本文的內(nèi)容對大家的學習或者工作具有一定的參考學習價值，如果有疑問大家可以留言交流，謝謝大家對創(chuàng)新互聯(lián)的支持。

標題名稱：Android自定義柱狀圖表的方法實例
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