1.先準備好圖片
2.新建一個CreditScoreView類,繼承View
public class CreditScoreView extends View { //數據個數 private int dataCount = 5; //每個角的弧度 private float radian = (float) (Math.PI * 2 / dataCount); //雷達圖半徑 private float radius; //中心X座標 private int centerX; //中心Y座標 private int centerY; //各維度標題 private String[] titles = {"履約能力", "信用歷史", "人脈關係", "行爲偏好", "身份特質"}; //各維度圖標 private int[] icons = {R.mipmap.ic_performance, R.mipmap.ic_history, R.mipmap.ic_contacts, R.mipmap.ic_predilection, R.mipmap.ic_identity}; //各維度分值 private float[] data = {170, 180, 160, 170, 180}; //數據最大值 private float maxValue = 190; //雷達圖與標題的間距 private int radarMargin = DensityUtils.dp2px(getContext(), 15); //雷達區畫筆 private Paint mainPaint; //數據區畫筆 private Paint valuePaint; //分數畫筆 private Paint scorePaint; //標題畫筆 private Paint titlePaint; //圖標畫筆 private Paint iconPaint; //分數大小 private int scoreSize = DensityUtils.dp2px(getContext(), 28); //標題文字大小 private int titleSize = DensityUtils.dp2px(getContext(), 13); public CreditScoreView(Context context) { this(context, null); } public CreditScoreView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public CreditScoreView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private void init() { mainPaint = new Paint(); mainPaint.setAntiAlias(true); mainPaint.setStrokeWidth(0.3f); mainPaint.setColor(Color.WHITE); mainPaint.setStyle(Paint.Style.STROKE); valuePaint = new Paint(); valuePaint.setAntiAlias(true); valuePaint.setColor(Color.WHITE); valuePaint.setAlpha(120); valuePaint.setStyle(Paint.Style.FILL_AND_STROKE); scorePaint = new Paint(); scorePaint.setAntiAlias(true); scorePaint.setTextSize(scoreSize); scorePaint.setColor(Color.WHITE); scorePaint.setTextAlign(Paint.Align.CENTER); scorePaint.setStyle(Paint.Style.FILL); titlePaint = new Paint(); titlePaint.setAntiAlias(true); titlePaint.setTextSize(titleSize); titlePaint.setColor(Color.WHITE); titlePaint.setStyle(Paint.Style.FILL); iconPaint = new Paint(); iconPaint.setAntiAlias(true); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { //雷達圖半徑 radius = Math.min(h, w) / 2 * 0.5f; //中心座標 centerX = w / 2; centerY = h / 2; postInvalidate(); super.onSizeChanged(w, h, oldw, oldh); } @Override public void draw(Canvas canvas) { super.draw(canvas); drawPolygon(canvas); drawLines(canvas); drawRegion(canvas); drawScore(canvas); drawTitle(canvas); drawIcon(canvas); } /** * 繪製多邊形 * * @param canvas 畫布 */ private void drawPolygon(Canvas canvas) { Path path = new Path(); for (int i = 0; i < dataCount; i++) { if (i == 0) { path.moveTo(getPoint(i).x, getPoint(i).y); } else { path.lineTo(getPoint(i).x, getPoint(i).y); } } //閉合路徑 path.close(); canvas.drawPath(path, mainPaint); } /** * 繪製連接線 * * @param canvas 畫布 */ private void drawLines(Canvas canvas) { Path path = new Path(); for (int i = 0; i < dataCount; i++) { path.reset(); path.moveTo(centerX, centerY); path.lineTo(getPoint(i).x, getPoint(i).y); canvas.drawPath(path, mainPaint); } } /** * 繪製覆蓋區域 * * @param canvas 畫布 */ private void drawRegion(Canvas canvas) { Path path = new Path(); for (int i = 0; i < dataCount; i++) { //計算百分比 float percent = data[i] / maxValue; int x = getPoint(i, 0, percent).x; int y = getPoint(i, 0, percent).y; if (i == 0) { path.moveTo(x, y); } else { path.lineTo(x, y); } } //繪製填充區域的邊界 path.close(); valuePaint.setStyle(Paint.Style.STROKE); canvas.drawPath(path, valuePaint); //繪製填充區域 valuePaint.setStyle(Paint.Style.FILL_AND_STROKE); canvas.drawPath(path, valuePaint); } /** * 繪製分數 * * @param canvas 畫布 */ private void drawScore(Canvas canvas) { int score = 0; //計算總分 for (int i = 0; i < dataCount; i++) { score += data[i]; } canvas.drawText(score + "", centerX, centerY + scoreSize / 2, scorePaint); } /** * 繪製標題 * * @param canvas 畫布 */ private void drawTitle(Canvas canvas) { for (int i = 0; i < dataCount; i++) { int x = getPoint(i, radarMargin, 1).x; int y = getPoint(i, radarMargin, 1).y; Bitmap bitmap = BitmapFactory.decodeResource(getResources(), icons[i]); int iconHeight = bitmap.getHeight(); float titleWidth = titlePaint.measureText(titles[i]); //底下兩個角的座標需要向下移動半個圖片的位置(1、2) if (i == 1) { y += (iconHeight / 2); } else if (i == 2) { x -= titleWidth; y += (iconHeight / 2); } else if (i == 3) { x -= titleWidth; } else if (i == 4) { x -= titleWidth / 2; } canvas.drawText(titles[i], x, y, titlePaint); } } /** * 繪製圖標 * * @param canvas 畫布 */ private void drawIcon(Canvas canvas) { for (int i = 0; i < dataCount; i++) { int x = getPoint(i, radarMargin, 1).x; int y = getPoint(i, radarMargin, 1).y; Bitmap bitmap = BitmapFactory.decodeResource(getResources(), icons[i]); int iconWidth = bitmap.getWidth(); int iconHeight = bitmap.getHeight(); float titleWidth = titlePaint.measureText(titles[i]); //上面獲取到的x、y座標是標題左下角的座標 //需要將圖標移動到標題上方居中位置 if (i == 0) { x += (titleWidth - iconWidth) / 2; y -= (iconHeight + getTextHeight(titlePaint)); } else if (i == 1) { x += (titleWidth - iconWidth) / 2; y -= (iconHeight / 2 + getTextHeight(titlePaint)); } else if (i == 2) { x -= (iconWidth + (titleWidth - iconWidth) / 2); y -= (iconHeight / 2 + getTextHeight(titlePaint)); } else if (i == 3) { x -= (iconWidth + (titleWidth - iconWidth) / 2); y -= (iconHeight + getTextHeight(titlePaint)); } else if (i == 4) { x -= iconWidth / 2; y -= (iconHeight + getTextHeight(titlePaint)); } canvas.drawBitmap(bitmap, x, y, titlePaint); } } /** * 獲取雷達圖上各個點的座標 * * @param position 座標位置(右上角爲0,順時針遞增) * @return 座標 */ private Point getPoint(int position) { return getPoint(position, 0, 1); } /** * 獲取雷達圖上各個點的座標(包括維度標題與圖標的座標) * * @param position 座標位置 * @param radarMargin 雷達圖與維度標題的間距 * @param percent 覆蓋區的的百分比 * @return 座標 */ private Point getPoint(int position, int radarMargin, float percent) { int x = 0; int y = 0; if (position == 0) { x = (int) (centerX + (radius + radarMargin) * Math.sin(radian) * percent); y = (int) (centerY - (radius + radarMargin) * Math.cos(radian) * percent); } else if (position == 1) { x = (int) (centerX + (radius + radarMargin) * Math.sin(radian / 2) * percent); y = (int) (centerY + (radius + radarMargin) * Math.cos(radian / 2) * percent); } else if (position == 2) { x = (int) (centerX - (radius + radarMargin) * Math.sin(radian / 2) * percent); y = (int) (centerY + (radius + radarMargin) * Math.cos(radian / 2) * percent); } else if (position == 3) { x = (int) (centerX - (radius + radarMargin) * Math.sin(radian) * percent); y = (int) (centerY - (radius + radarMargin) * Math.cos(radian) * percent); } else if (position == 4) { x = centerX; y = (int) (centerY - (radius + radarMargin) * percent); } return new Point(x, y); } /** * 獲取文本的高度 * * @param paint 文本繪製的畫筆 * @return 文本高度 */ private int getTextHeight(Paint paint) { Paint.FontMetrics fontMetrics = paint.getFontMetrics(); return (int) (fontMetrics.descent - fontMetrics.ascent); } }
3.DensityUtils類
public class DensityUtils { public static int dp2px(Context context, float dp) { //獲取設備密度 float density = context.getResources().getDisplayMetrics().density; //4.3, 4.9, 加0.5是爲了四捨五入 int px = (int) (dp * density + 0.5f); return px; } public static float px2dp(Context context, int px) { //獲取設備密度 float density = context.getResources().getDisplayMetrics().density; float dp = px / density; return dp; } }
4.在activity的xml中寫上這個控件,設上背景就好
<com.example.jy_mac_01.myapplication.CreditScoreView android:layout_width="300dp" android:layout_height="300dp" android:layout_centerInParent="true" android:background="@color/colorPrimary" />
5.運行
6.完結