Android中自定义环形图

如图：

自定义view

package com.riverlet.ringview;import android.animation.ObjectAnimator;import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.RectF;import android.util.AttributeSet;import android.util.Log;import android.view.View;import android.view.animation.AccelerateInterpolator;public class AnnularChartView extends View {    /**     * 默认颜色     */    private static final int[] DEFAULT_COLOR = new int[]{0xff82B8FF, 0xffFF7F78, 0xffFFAE72, 0xff74D1B1, 0xffC38AFC};    /**     * 圆环半径，以内环算     */    private int innerRadius;    /**     * 圆环厚度     */    private int ringWidth;    /**     * 画笔数组     */    private Paint[] paints;    /**     * 画笔数组对应的颜色     */    private int[] colors = DEFAULT_COLOR;    /**     * 圆环圆心x坐标     */    private int centerX;    /**     * 圆环圆心y坐标     */    private int centerY;    /**     * 圆环范围     */    private RectF oval;    /**     * 每个数据对应的角度     */    private int[] angles;    /**     * 数据     */    private float[] datas;    /**     * 动画用的进度     */    private float progress;    /**     * 动画     */    private ObjectAnimator animator;    public AnnularChartView(Context context) {        this(context, null);    }    public AnnularChartView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public AnnularChartView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        //动画        initAnimator();    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        //矩形        initRectF(getMeasuredWidth(), getMeasuredHeight());    }    /**     * 计算圆环的范围     *     * @param w     * @param h     */    private void initRectF(int w, int h) {        if (w == 0 && h == 0) {            return;        }        centerX = (int) ((float) w / 2);        centerY = (int) ((float) h / 2);        innerRadius = (int) ((float) w / 2 / 89 * 64);        ringWidth = (int) ((float) w / 2 / 89 * 25);        oval = new RectF(centerX - innerRadius, centerY - innerRadius, centerX + innerRadius, centerY + innerRadius);    }    /**     * 初始化paint     */    private void initPaints() {        if (datas == null) {            angles = null;        } else {            float total = 0;            for (float data : datas) {                total += data;            }            if (total <= 0) {                angles = null;            } else {                angles = new int[datas.length];                int sumAngles = 0;                for (int i = 0; i < datas.length; i++) {                    float angle;                    if (i == datas.length - 1) {                        angles[i] = 360 - sumAngles;                        Log.v("setData", angles[i] + "");                    } else {                        angle = datas[i] / total * 360;                        if (angle < 1) {                            angles[i] = 1;                        } else {                            angles[i] = Math.round(angle);                        }                        sumAngles += angles[i];                        Log.v("setData", angles[i] + "");                    }                }            }        }        if (angles != null) {            //用于定义的圆弧的形状和大小的界限            paints = new Paint[angles.length];            for (int i = 0; i < angles.length; i++) {                Paint paint = new Paint();                paint.setColor(colors[i % colors.length]);                paint.setStyle(Paint.Style.STROKE);                paint.setStrokeWidth(25);                paint.setAntiAlias(true);                paints[i] = paint;            }        }        animStart();    }    private void initAnimator() {        progress = 0;        animator = ObjectAnimator.ofFloat(this, "progress", 0f, 1.0f);        animator.setDuration(800);        animator.setInterpolator(new AccelerateInterpolator());        animator.start();    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        if (oval == null) {            initRectF(getWidth(), getHeight());        }        int lastAngle = 0;        int nums = angles == null ? 0 : angles.length;        if (nums > 0) {            for (int i = 0; i < nums; i++) {                if (i > 0) {                    lastAngle = (int) (lastAngle + angles[i - 1] * progress);                }                paints[i].setStrokeWidth(ringWidth);                if (angles[i] > 0) {                    canvas.drawArc(oval, 270 + lastAngle, (angles[i] + 1) * progress, false, paints[i]);                }            }        } else {            Paint paint = new Paint();            paint.setColor(0xffa0a0a0);            paint.setStyle(Paint.Style.STROKE);            paint.setStrokeWidth(ringWidth);            paint.setAntiAlias(true);            canvas.drawArc(oval, 270, 360 * progress + 1, false, paint);        }    }    public float getProgress() {        return progress;    }    public void setProgress(float progress) {        this.progress = progress;        invalidate();    }    /**     * 开始动画     */    public void animStart() {        if (animator.isStarted()) {            animator.cancel();        }        animator.start();    }    public void setData(float[] datas) {        this.datas = datas;        initPaints();    }    public int[] getColors() {        return colors;    }    public void setColors(int[] colors) {        this.colors = colors;    }    public void setAnimator(ObjectAnimator animator) {        this.animator = animator;    }}

布局

<?xml version="1.0" encoding="utf-8"?>

MainActivity中

package com.riverlet.ringview;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;public class MainActivity extends AppCompatActivity implements View.OnClickListener {    AnnularChartView annularChartView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        annularChartView = findViewById(R.id.annularChartView);        findViewById(R.id.text_1).setOnClickListener(this);        findViewById(R.id.text_2).setOnClickListener(this);        findViewById(R.id.text_3).setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.text_1:                annularChartView.setData(new float[]{100f, 100f, 100f, 100f, 100f});                break;            case R.id.text_2:                annularChartView.setData(new float[]{100f, 200f, 300f, 400f, 500f});                break;            case R.id.text_3:                annularChartView.setData(new float[]{500f, 100f, 300f, 100f, 600f});                break;        }    }}

　　完成

参考于：//https://www.jianshu.com/p/03f6751e4c99

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