用途说明:
这是一个自定义的圆环图像，支持动画展示，可以自定义圆环的颜色和占比，主要用以展示一些数据占比方面展示的android圆环。
圆环实现思路:
android的自定义圆环实现有很多种方法，这里只介绍我实现的思路。主要思路是先画一个大圆，然后再画一个与大圆同圆心的小圆，然后小圆的颜色可以设置为背景色，这样看上去就是一个圆环了。
实现效果:
动画效果
使用方法:
1.布局文件中直接使用自定义圆环（RingView），控件的宽和高需要固定的尺寸
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
android:orientation="vertical">
<com.wuden.zxingproject.widgets.RingView
android:id="@+id/rvRingView"
android:layout_gravity="center"
android:layout_width="300dp"
android:layout_height="300dp" />
</LinearLayout>
2.在对应的activty中调用一些方法来实现你的需求即可
public class TestActivity extends AppCompatActivity {
@Bind(R.id.rvRingView)
RingView mRvRingView;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_test1);
ButterKnife.bind(this);
mRvRingView.setAnglesData("12.2","230","6799.01","1","111","200");//直接设置String类型的数据
// mRvRingView.setAnglesData(12.2,230,6799.01,1,111,200);//直接设置double类型的数据
// mRvRingView.setAngles(20, 40, 100, 180, 20);//设置的是角度
// mRvRingView.setRingStartAngle(-90);//设置圆环的开始角度，不设置默认是-90
//设置画笔的颜色，支持字符串和资源文件可变参数。
mRvRingView.initPaint("#123456", "#fea123", "#fefefe", "#78da10", "#1121de", "#aacc18");//支持字符串
// mRvRingView.initPaint(R.color.color_first_part,R.color.color_second_part,
// R.color.color_third_part,R.color.color_fourth_part,
// R.color.color_fifth_part,R.color.color_sixth_part);
// mRvRingView.setInnerCirclePaintColor("#ffffff");//内圆的画笔颜色，默认#ffffff
mRvRingView.setRingStrokeWidth(40);//圆环的环宽，默认20
// mRvRingView.showViewWithAnimation(1000);//自定义动画时长展示圆环
// mRvRingView.showViewWithoutAnimation();//展示圆环不带动画
mRvRingView.showViewWithAnimation();//动画展示圆环，默认2s
}
}
3.自定义view的源码
public class RingView extends View {
private static final int CIRCLE_ANGLE = 360;//圆环的角度
private static final int RING_STROKE_WIDTH = 20;//默认圆环的宽度为20dp
private Paint mNoAssetsPaint, mInnerCirclePaint;
private ArrayList<Paint> mPaints;
private int mRingStrokeWidth;//圆环的宽度
private int mCanvasWidth, mCanvasHeight;
private RectF mRingRect, mInnerRect;
private int mDensity;//手机屏幕密度
private int mNoDataPaintColor = Color.parseColor("#cccccc");//没有数据的paint的颜色
private int mInnerCirclePaintColor = Color.parseColor("#ffffff");//内圆的paint的颜色
private ArrayList<Integer> mAngles;//传入的数据
private boolean mHasData = false;
private ArrayList<Integer> mLevelStartAngles;//每段圆弧的起始角度值
private int mMoveAngle;//圆弧移动的角度
private int mRingStartAngle = -90;//圆环的起始角度
private RingAnimation mRingAnim;
public RingView(Context context) {
super(context);
init(context);
}
public RingView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public RingView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
private void init(Context ctx) {
mDensity = (int) ctx.getResources().getDisplayMetrics().density;
mRingStrokeWidth = RING_STROKE_WIDTH * mDensity;
mPaints = new ArrayList<Paint>();
mAngles = new ArrayList<Integer>();
mLevelStartAngles = new ArrayList<Integer>();
mNoAssetsPaint = new Paint();
mNoAssetsPaint.setAntiAlias(true);
mNoAssetsPaint.setStyle(Paint.Style.FILL);
mNoAssetsPaint.setColor(mNoDataPaintColor);
mInnerCirclePaint = new Paint();
mInnerCirclePaint.setAntiAlias(true);
mInnerCirclePaint.setStyle(Paint.Style.FILL);
mInnerCirclePaint.setColor(mInnerCirclePaintColor);
mRingAnim = new RingAnimation();
}
@Override
protected void onDraw(Canvas canvas) {
if (mCanvasWidth == 0) {
initRect();
}
if (!mHasData) {//没有数据
mMoveAngle = CIRCLE_ANGLE;
drawRingView(canvas, mRingStartAngle, mMoveAngle, mNoAssetsPaint);
} else {
int _level = 0;//圆弧的段数
for (int _i = 0; _i < mAngles.size(); _i++) {//计算需要画几段圆弧
if (mMoveAngle < mLevelStartAngles.get(1)) {
_level = 1;
} else if (mMoveAngle > mLevelStartAngles.get(_i) && mMoveAngle <= mLevelStartAngles.get(_i + 1)) {
_level = _i + 1;
}
}
drawRing(_level, canvas);
}
canvas.drawArc(mInnerRect, mRingStartAngle, CIRCLE_ANGLE, true, mInnerCirclePaint);//画内部的圆
}
/**
*
* @param level 圆环的段数
* @param canvas
*/
private void drawRing(int level, Canvas canvas) {
if (level <= 0) {
drawRingView(canvas, mRingStartAngle, CIRCLE_ANGLE, mNoAssetsPaint);
return;
}
if (mAngles.size() > mPaints.size()) {
int _temp = mAngles.size() - mPaints.size();
for (int _i = 0; _i < _temp; _i++) {
mPaints.add(mNoAssetsPaint);
}
}
for (int _i = 0; _i < level; _i++) {
if (_i == level - 1) {
drawRingView(canvas, mRingStartAngle + mLevelStartAngles.get(_i),
mMoveAngle - mLevelStartAngles.get(_i), mPaints.get(_i));
} else {
drawRingView(canvas, mRingStartAngle + mLevelStartAngles.get(_i), mAngles.get(_i), mPaints.get(_i));
}
}
}
/**
*
* @param canvas
* @param startAngle 开始的角度
* @param sweepAngle 旋转的角度
* @param paint 画笔
*/
private void drawRingView(Canvas canvas, int startAngle, int sweepAngle, Paint paint) {
if (sweepAngle != 0) {
canvas.drawArc(mRingRect, startAngle, sweepAngle, true, paint);
}
}
public void setNoDataPaintColor(int color) {
mNoAssetsPaint.setColor(getResources().getColor(color));
}
public void setNoDataPaintColor(String color) {
mNoAssetsPaint.setColor(Color.parseColor(color));
}
public void setInnerCirclePaintColor(int colorId) {
mInnerCirclePaint.setColor(getResources().getColor(colorId));
}
public void setInnerCirclePaintColor(String color){
mInnerCirclePaint.setColor(Color.parseColor(color));
}
public void initPaint(ArrayList<Integer> colors) {
mPaints.clear();
for (int _i = 0; _i < colors.size(); _i++) {
Paint _paint = new Paint();
_paint.setAntiAlias(true);
_paint.setStyle(Paint.Style.FILL);
_paint.setColor(colors.get(_i));
mPaints.add(_paint);
}
}
public void initPaint(String... colors) {
ArrayList<Integer> _colors = new ArrayList<Integer>();
for (int _i = 0; _i < colors.length; _i++) {
_colors.add(Color.parseColor(colors[_i]));
}
initPaint(_colors);
}
public void initPaint(int... colorIds) {
ArrayList<Integer> _colors = new ArrayList<Integer>();
for (int _i = 0; _i < colorIds.length; _i++) {
_colors.add(getResources().getColor(colorIds[_i]));
}
initPaint(_colors);
}
private void initRect() {
mCanvasWidth = getWidth();
mCanvasHeight = getHeight();
mInnerRect = new RectF(mRingStrokeWidth, mRingStrokeWidth, mCanvasWidth - mRingStrokeWidth, mCanvasHeight - mRingStrokeWidth);
mRingRect = new RectF(0, 0, mCanvasWidth, mCanvasHeight);
}
/**
* 设置圆环起始的角度
* @param angle
*/
public void setRingStartAngle(int angle){
mRingStartAngle = angle;
}
/**
* 设置圆环的环宽
*
* @param width
*/
public void setRingStrokeWidth(int width) {
mRingStrokeWidth = width * mDensity;
invalidate();
}
/**
* 所需要显示的数据的角度
*
* @param angles
*/
public void setAngles(int... angles) {
ArrayList<Integer> _angles = new ArrayList<Integer>();
for (int _i = 0; _i < angles.length; _i++) {
_angles.add(angles[_i]);
}
setAngles(_angles);
}
/**
* 所需要显示的数据的角度
*
* @param angles
*/
public void setAngles(ArrayList<Integer> angles) {
mAngles.clear();
mAngles.addAll(angles);
mLevelStartAngles.clear();
mLevelStartAngles.add(0);
int _angle = 0;
for (int _i = 0; _i < mAngles.size(); _i++) {
_angle += mAngles.get(_i);
mLevelStartAngles.add(_angle);
if (mAngles.get(_i) > 0) {
mHasData = true;
}
}
}
/**
* 设置数据来计算角度并绘制圆环
*
* @param data
*/
public void setAnglesData(BigDecimal... data) {
BigDecimal _total = new BigDecimal("0.00");
for (int _i = 0; _i < data.length; _i++) {
_total = _total.add(data[_i]);
}
if (_total.compareTo(BigDecimal.valueOf(0)) == 0) {
mHasData = false;
return;
}
BigDecimal[] _dbData = new BigDecimal[data.length];
for (int _i = 0; _i < data.length; _i++) {
_dbData[_i] = data[_i].divide(_total, 10, ROUND_HALF_UP).multiply(BigDecimal.valueOf(360));
}
int[] _intData = new int[data.length];
for (int _i = 0; _i < data.length; _i++) {
//数值小于1且大于0的，就直接定1，否则转int类型，确保小数据也能出现在圆环上
_intData[_i] = _dbData[_i].compareTo(BigDecimal.valueOf(1.0)) < 0 && _dbData[_i].compareTo(BigDecimal.valueOf(0)) > 0 ?
1 : _dbData[_i].intValue();
}
//所有数据加起来可能会不满360也可能会超出360，由于精度的问题
//处理方案是把缺少的度数（有正也有负）加在最大的值上，这样图形出现的误差会不明显
int _remind = 360;//剩余的角度
int _maxPosition = -1, _max = _intData[0];
for (int _i = 0; _i < _intData.length; _i++) {
_remind = _remind - _intData[_i];
if (_max <= _intData[_i]) {
_maxPosition = _i;
}
}
_intData[_maxPosition] += _remind;//将缺少的度数加载最大值上
//将最终的数据设置到圆环上
setAngles(_intData);
}
public void setAnglesData(String... data) {
BigDecimal[] _bdData = new BigDecimal[data.length];
for (int _i = 0; _i < data.length; _i++) {
_bdData[_i] = new BigDecimal(TextUtils.isEmpty(data[_i]) ? "0" : data[_i]);
}
setAnglesData(_bdData);
}
public void setAnglesData(double... data) {
BigDecimal[] _bdData = new BigDecimal[data.length];
for (int _i = 0; _i < data.length; _i++) {
_bdData[_i] = BigDecimal.valueOf(data[_i]);
}
setAnglesData(_bdData);
}
/**
* 自定义动画时间的圆环
*
* @param animTime
*/
public void showViewWithAnimation(int animTime) {
startAnimation(animTime);
}
/**
* 默认时间（2000）的圆环
*/
public void showViewWithAnimation() {
startAnimation(-1);
}
/**
* 不带动画的圆环
*/
public void showViewWithoutAnimation() {
mMoveAngle = CIRCLE_ANGLE;
invalidate();
}
private void startAnimation(int animTime) {
mRingAnim.setDuration(animTime <= 0 ? 2000 : animTime);
startAnimation(mRingAnim);
}
private class RingAnimation extends Animation {
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
mMoveAngle = (int) (interpolatedTime * CIRCLE_ANGLE);
invalidate();
}
}
}
4.代码实现的一些注意点
1）控件的宽和高必须是固定的，不然无法显示。
2）画笔颜色的数组长度必须大于或等于数据数组的长度，不然超出的数据将由默认的没有数据的颜色显示。
3）在设置画笔颜色时，使用的字符串形式的颜色必须严格遵循颜色的书写方式，不然会出现无法正确显示view。例如：不支持“#fff”，支持“#ffffff”。
