https://github.com/zhangqifan1/LineChartTest

图表搜折线有一个简单的折线 高度定制

做一个柱状图

public class SimpleHistogram extends View {private float mSelfWidth;private float mSelfHeight;private List<RectF> mRectF;private Paint mPaint;//列宽度private float columnWidth = 80f;//间距宽度private float columnSpace = 0;//底部文字和图形的距离private float bottomTextSpace = 20;//顶部文字和图形的距离private float topTextSpace = 50;//文字的宽度高度private float textH;private float textW;Paint.FontMetrics mFontMetrics;private String mProvince[] = {"内蒙古", "福建", "湖南", "上海", "广州"};private int mPrice[] = {2, 3, 2, 3, 2};public SimpleHistogram(Context context) {this(context, null);}public SimpleHistogram(Context context, @Nullable AttributeSet attrs) {this(context, attrs, 0);}public SimpleHistogram(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}private void init() {mRectF = new ArrayList<>();mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);//间距宽度 （总宽度 - 列宽度*列数 ）/（列数+1）columnSpace = (mSelfWidth - columnWidth * mPrice.length) / (mPrice.length + 1);Rect rect = new Rect();mPaint.setTextSize(ConvertUtils.dp2px(13));mPaint.setColor(Color.parseColor("#333333"));mPaint.setTextAlign(Paint.Align.CENTER);mFontMetrics = mPaint.getFontMetrics();mPaint.getTextBounds(mProvince[0], 0, mProvince[0].length(), rect);textW = rect.width();textH = mFontMetrics.bottom - mFontMetrics.top;}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);mSelfHeight = h;mSelfWidth = w;}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);init();initRectF();drawBottomText(canvas);drawLine(canvas);drawRectF(canvas);drawTopText(canvas);}private void drawTopText(Canvas canvas) {mPaint.setColor(Color.parseColor("#333333"));for (int i = 0; i < mRectF.size(); i++) {RectF rectF = mRectF.get(i);String str = String.valueOf(mPrice[i]);float x = rectF.left + rectF.width() / 2;float y = mSelfHeight - (rectF.height() + topTextSpace + textH);canvas.drawText(str, x, y, mPaint);}}private void drawRectF(Canvas canvas) {mPaint.setColor(Color.parseColor("#FF561D"));for (int i = 0; i < mRectF.size(); i++) {RectF rectF = mRectF.get(i);LinearGradient lg = new LinearGradient(rectF.left,rectF.top,rectF.right,rectF.bottom,// 黄色 橙色Color.parseColor("#FF9E20"),Color.parseColor("#E0BE94"),Shader.TileMode.MIRROR);mPaint.setShader(lg);canvas.drawRect(rectF, mPaint);}}private void drawLine(Canvas canvas) {mPaint.setColor(Color.parseColor("#FF561D"));canvas.drawLine(0, mSelfHeight - textH - bottomTextSpace, mSelfWidth, mSelfHeight - textH - bottomTextSpace, mPaint);}private void drawBottomText(Canvas canvas) {mPaint.setColor(Color.parseColor("#333333"));mPaint.setTextAlign(Paint.Align.CENTER);Rect textRect = new Rect();for (int i = 0; i < mRectF.size(); i++) {RectF rectF = mRectF.get(i);String str = mProvince[i];mPaint.getTextBounds(str, 0, str.length(), textRect);float x = rectF.left + (rectF.width() / 2);float y = mSelfHeight - mFontMetrics.bottom;canvas.drawText(str, x, y, mPaint);}}private void initRectF() {float proportionHeight = (mSelfHeight - bottomTextSpace - topTextSpace - 2 * textH) / getMaxData();for (int i = 0; i < mPrice.length; i++) {float left = columnSpace * (i + 1) + columnWidth * i;float right = left + columnWidth;float bottom = mSelfHeight - textH - bottomTextSpace;float top = bottom - mPrice[i] * proportionHeight;RectF rectF = new RectF();rectF.top = top;rectF.left = left;rectF.right = right;rectF.bottom = bottom;mRectF.add(rectF);}}private float getMaxData() {float max = 0;for (int i = 0; i < mPrice.length; i++) {max = Math.max(max, mPrice[i]);}return max;}public void setData(int[] f, String[] s) {if (f.length != s.length) {throw new RuntimeException("数据不匹配");}mPrice = f;mProvince = s;invalidate();}}