圆形的ImageView

转载自gitHub的ImageView，因为本身就是可用的，也没什么好说的，拷贝回去用就是了，可以设置除了背景，还可以设置边框什么的，比起CardView设置圆角，功能更加强大。

import android.animation.ArgbEvaluator;
import android.animation.ValueAnimator;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Build;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.LinearInterpolator;

public class AnimateCheckBox extends View {

    private static final int DEFAULT_LINE_WIDTH = 4;
    private static final int DEFAULT_LINE_COLOR = Color.WHITE;
    private static final int DEFAULT_CHECKED_COLOR = Color.RED;
    private static final int DEFAULT_UNCHECK_COLOR = Color.GRAY;
    private static final int DEFAULT_ANIM_DURATION = 150;
    private static int DEFAULT_RADIUS = 10;
    private Paint mCirclePaint;
    private Paint mLinePaint;

    private int radius;                    //圆的半径  private int width, height;             //控件宽高  private int cx, cy;                    //圆心xy坐标  private float[] points = new float[6]; //对号的3个点的坐标  private float correctProgress;
    private float downY;
    private boolean isChecked;
    private boolean toggle;
    private boolean isAnim;

    private int animDuration = DEFAULT_ANIM_DURATION;
    private int unCheckColor = DEFAULT_UNCHECK_COLOR;
    private int circleColor = DEFAULT_CHECKED_COLOR;
    private int correctColor = DEFAULT_LINE_COLOR;
    private int correctWidth = DEFAULT_LINE_WIDTH;

    private OnCheckedChangeListener listener;

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

    public AnimateCheckBox(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public AnimateCheckBox(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AnimateCheckBox, defStyleAttr, 0);

        circleColor = a.getColor(R.styleable.AnimateCheckBox_checkedColor, DEFAULT_CHECKED_COLOR);
        unCheckColor = a.getColor(R.styleable.AnimateCheckBox_unCheckColor, DEFAULT_UNCHECK_COLOR);
        correctColor = a.getColor(R.styleable.AnimateCheckBox_lineColor, DEFAULT_LINE_COLOR);
        correctWidth = a.getDimensionPixelSize(R.styleable.AnimateCheckBox_lineWidth, DEFAULT_LINE_WIDTH);
        animDuration = a.getInteger(R.styleable.AnimateCheckBox_animDuration, DEFAULT_ANIM_DURATION);

        a.recycle();

        init(context);

    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public AnimateCheckBox(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    /**  * 根据手机的分辨率从 dp 的单位 转成为 px(像素)  */  public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    /**  * 初始化  *  * @param context  */  private void init(Context context) {

        mCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mCirclePaint.setStyle(Paint.Style.FILL);
        mCirclePaint.setColor(circleColor);

        mLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mLinePaint.setStyle(Paint.Style.FILL);
        mLinePaint.setColor(correctColor);
        mLinePaint.setStrokeWidth(correctWidth);

        setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isChecked) {
                    hideCorrect();
                } else {
                    showCheck();
                }
            }
        });
    }

    /**  * 返回当前选中状态  *  * @return  */  public boolean isChecked() {
        return isChecked;
    }

    /**  * 设置当前选中状态  *  * @param checked  */  public void setChecked(boolean checked) {
        if (isChecked && !checked) {
            hideCorrect();
        } else if (!isChecked && checked) {
            showCheck();
        }
    }

    public void setUncheckStatus() {
        isChecked = false;
        radius = DEFAULT_RADIUS;
        correctProgress = 0;
        invalidate();
    }

    /**  * 确定尺寸坐标  *  * @param w  * @param h  * @param oldw  * @param oldh  */  @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        height = width = Math.min(w - getPaddingLeft() - getPaddingRight(), h - getPaddingBottom() - getPaddingTop());
        cx = w / 2;
        cy = h / 2;

        float r = height / 2f;
        points[0] = r / 2f + getPaddingLeft();
        points[1] = r + getPaddingTop();

        points[2] = r * 5f / 6f + getPaddingLeft();
        points[3] = r + r / 3f + getPaddingTop();

        points[4] = r * 1.5f + getPaddingLeft();
        points[5] = r - r / 3f + getPaddingTop();
        DEFAULT_RADIUS = radius = (int) (height * 0.125f);
    }

    @Override
    protected void onDraw(Canvas canvas) {

        float f = (radius - height * 0.125f) / (height * 0.5f); //当前进度  mCirclePaint.setColor(evaluate(f, unCheckColor, circleColor));
        canvas.drawCircle(cx, cy, radius, mCirclePaint); //画圆   //画对号  if (correctProgress > 0) {
            if (correctProgress < 1 / 3f) {
                float x = points[0] + (points[2] - points[0]) * correctProgress;
                float y = points[1] + (points[3] - points[1]) * correctProgress;
                canvas.drawLine(points[0], points[1], x, y, mLinePaint);
            } else {
                float x = points[2] + (points[4] - points[2]) * correctProgress;
                float y = points[3] + (points[5] - points[3]) * correctProgress;
                canvas.drawLine(points[0], points[1], points[2], points[3], mLinePaint);
                canvas.drawLine(points[2], points[3], x, y, mLinePaint);
            }
        }
    }

    /**  * 设置圆的颜色  *  * @param color  */  public void setCircleColor(int color) {
        circleColor = color;
    }

    /**  * 设置对号的颜色  *  * @param color  */  public void setLineColor(int color) {
        mLinePaint.setColor(color);
    }

    /**  * 设置未选中时的颜色  *  * @param color  */  public void setUnCheckColor(int color) {
        unCheckColor = color;
    }

    private int evaluate(float fraction, int startValue, int endValue) {
        if (fraction <= 0) {
            return startValue;
        }
        if (fraction >= 1) {
            return endValue;
        }
        int startInt = startValue;
        int startA = (startInt >> 24) & 0xff;
        int startR = (startInt >> 16) & 0xff;
        int startG = (startInt >> 8) & 0xff;
        int startB = startInt & 0xff;

        int endInt = endValue;
        int endA = (endInt >> 24) & 0xff;
        int endR = (endInt >> 16) & 0xff;
        int endG = (endInt >> 8) & 0xff;
        int endB = endInt & 0xff;

        return ((startA + (int) (fraction * (endA - startA))) << 24) | ((startR + (int) (fraction * (endR - startR))) << 16) | ((startG + (int) (fraction * (endG - startG))) << 8) | ((startB + (int) (fraction * (endB - startB))));
    }

    /**  * 处理触摸事件触发动画  */   private class OnChangeStatusListener implements OnTouchListener {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    downY = event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE:
                    float dy = event.getRawY() - downY;
                    if (Math.abs(dy) >= 0) { //滑过一半触发  toggle = true;
                    } else {
                        toggle = false;
                    }
                    break;
                case MotionEvent.ACTION_CANCEL:
                case MotionEvent.ACTION_UP:
                    if (toggle) {
                        if (isChecked) {
                            hideCorrect();
                        } else {
                            showCheck();
                        }
                    }
                    break;
            }
            return true;
        }
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    private void showUnChecked() {
        if (isAnim) {
            return;
        }

        isAnim = true;
        ValueAnimator va = ValueAnimator.ofFloat(0, 1).setDuration(animDuration);
        va.setInterpolator(new LinearInterpolator());
        va.start();
        va.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float value = (float) animation.getAnimatedValue(); // 0f ~ 1f  radius = (int) ((1 - value) * height * 0.375f + height * 0.125f);
                if (value >= 1) {
                    isChecked = false;
                    isAnim = false;
                    if (listener != null) {
                        listener.onCheckedChanged(AnimateCheckBox.this, false);
                    }
                }
                invalidate();
            }
        });
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    private void showCheck() {
        if (isAnim) {
            return;
        }
        isAnim = true;
        ValueAnimator va = ValueAnimator.ofFloat(0, 1).setDuration(animDuration);
        va.setInterpolator(new LinearInterpolator());
        va.start();
        va.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float value = (float) animation.getAnimatedValue(); // 0f ~ 1f  radius = (int) (value * height * 0.37f + height * 0.125f);
                if (value >= 1) {
                    isChecked = true;
                    isAnim = false;
                    if (listener != null) {
                        listener.onCheckedChanged(AnimateCheckBox.this, true);
                    }
                    showCorrect();
                }
                invalidate();
            }
        });
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    private void showCorrect() {
        if (isAnim) {
            return;
        }
        isAnim = true;
        ValueAnimator va = ValueAnimator.ofFloat(0, 1).setDuration(animDuration);
        va.setInterpolator(new LinearInterpolator());
        va.start();
        va.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float value = (float) animation.getAnimatedValue(); // 0f ~ 1f  correctProgress = value;
                invalidate();
                if (value >= 1) {
                    isAnim = false;
                }
            }
        });
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    private void hideCorrect() {
        if (isAnim) {
            return;
        }
        isAnim = true;
        ValueAnimator va = ValueAnimator.ofFloat(0, 1).setDuration(animDuration);
        va.setInterpolator(new LinearInterpolator());
        va.start();
        va.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float value = (float) animation.getAnimatedValue(); // 0f ~ 1f  correctProgress = 1 - value;
                invalidate();
                if (value >= 1) {
                    isAnim = false;
                    showUnChecked();
                }
            }
        });
    }

    public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
        this.listener = listener;
    }

    public interface OnCheckedChangeListener {
        void onCheckedChanged(View buttonView, boolean isChecked);
    }
}
style参数设置
<declare-styleable name="CircleImageView">
    <attr name="civ_border_width" format="dimension" />
    <attr name="civ_border_color" format="color" />
    <attr name="civ_border_overlay" format="boolean" />
    <attr name="civ_fill_color" format="color" />
</declare-styleable>
XML布局文件添加代码
xmlns:app="http://schemas.android.com/apk/res-auto"