原文:Android笔记--自定义控件仿遥控器的圆形上下左右OK圆盘按钮
上面就是几张预览图！代码在最底下
主要就两个步骤，画图、监听点击
1、整个控件基本上是一步步画出来的，重写onDraw方法开始for循环画扇形出来，画扇形的时候同时画扇形内的图标，扇形画完了之后画中心圆按钮，中心画了圆之后吧OK按钮画上。
2、重写onTouch方法监听手指触发的位置，根据按下的位置确定按钮在哪个扇形的范围上，然后重绘一下onDraw把按下的灰色背景绘制出来。难点在于如何确定按下的位置是否处于扇形范围，换了好几种方案，奈何数学不好，最后选了现在使用的方案。
package com.imxiaoyu.common.widget;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/**
* 仿遥控器上下左右ok圆形菜单
* Created by 庞光渝 on 2017/3/9.博客：https://my.oschina.net/u/1462828/blog
*/
public class RoundMenuView extends View {
/**
* 变量
*/
private int coreX;//中心点的坐标X
private int coreY;//中心点的坐标Y
private List<RoundMenu> roundMenus;//菜单列表
private boolean isCoreMenu = false;//是否有中心按钮
private int coreMenuColor;//中心按钮的默认背景--最好不要透明色
private int coreMenuStrokeColor;//中心按钮描边颜色
private int coreMenuStrokeSize;//中心按钮描边粗细
private int coreMenuSelectColor;//中心按钮选中时的背景颜色
private Bitmap coreBitmap;//OK图片
private OnClickListener onCoreClickListener;//中心按钮的点击回调
private float deviationDegree;//偏移角度
private int onClickState = -2;//-2是无点击，-1是点击中心圆，其他是点击菜单
private int roundRadius;//中心圆的半径
private double radiusDistance;//半径的长度比（中心圆半径=大圆半径*radiusDistance）
private long touchTime;//按下时间，抬起的时候判定一下，超过300毫秒算点击
public RoundMenuView(Context context) {
super(context);
}
public RoundMenuView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public RoundMenuView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onDraw(Canvas canvas) {
coreX = getWidth() / 2;
coreY = getHeight() / 2;
roundRadius = (int) (getWidth()/2 * radiusDistance);//计算中心圆圈半径
RectF rect = new RectF(0, 0, getWidth(), getHeight());
if (roundMenus != null && roundMenus.size() > 0) {
float sweepAngle = 360 / roundMenus.size();//每个弧形的角度
deviationDegree = sweepAngle / 2;//其实的偏移角度，如果4个扇形的时候是X形状，而非+,设为0试试就知道什么意思了
for (int i = 0; i < roundMenus.size(); i++) {
RoundMenu roundMenu = roundMenus.get(i);
//填充
Paint paint = new Paint();
paint.setAntiAlias(true);
if (onClickState == i) {
//选中
paint.setColor(roundMenu.selectSolidColor);
} else {
//未选中
paint.setColor(roundMenu.solidColor);
}
canvas.drawArc(rect, deviationDegree + (i * sweepAngle), sweepAngle, true, paint);
//画描边
paint = new Paint();
paint.setAntiAlias(true);
paint.setStrokeWidth(roundMenu.strokeSize);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(roundMenu.strokeColor);
canvas.drawArc(rect, deviationDegree + (i * sweepAngle), sweepAngle, roundMenu.useCenter, paint);
//画图案
Matrix matrix = new Matrix();
matrix.postTranslate((float) ((coreX + getWidth() / 2 * roundMenu.iconDistance) - (roundMenu.icon.getWidth() / 2)), coreY - (roundMenu.icon.getHeight() / 2));
matrix.postRotate(((i + 1) * sweepAngle), coreX, coreY);
canvas.drawBitmap(roundMenu.icon, matrix, null);
}
}
//画中心圆圈
if (isCoreMenu) {
//填充
RectF rect1 = new RectF(coreX - roundRadius, coreY - roundRadius, coreX + roundRadius, coreY + roundRadius);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setStrokeWidth(coreMenuStrokeSize);
if (onClickState == -1) {
paint.setColor(coreMenuSelectColor);
} else {
paint.setColor(coreMenuColor);
}
canvas.drawArc(rect1, 0, 360, true, paint);
//画描边
paint = new Paint();
paint.setAntiAlias(true);
paint.setStrokeWidth(coreMenuStrokeSize);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(coreMenuStrokeColor);
canvas.drawArc(rect1, 0, 360, true, paint);
if (coreBitmap != null) {
//画中心圆圈的“OK”图标
canvas.drawBitmap(coreBitmap, coreX - coreBitmap.getWidth() / 2, coreY - coreBitmap.getHeight() / 2, null);//在 0，0坐标开始画入src
}
}
}
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touchTime = new Date().getTime();
float textX = event.getX();
float textY = event.getY();
int distanceLine = (int) getDisForTwoSpot(coreX, coreY, textX, textY);//距离中心点之间的直线距离
if (distanceLine <= roundRadius) {
//点击的是中心圆；按下点到中心点的距离小于中心园半径，那就是点击中心园了
onClickState = -1;
} else if (distanceLine <= getWidth() / 2) {
//点击的是某个扇形；按下点到中心点的距离大于中心圆半径小于大圆半径，那就是点击某个扇形了
float sweepAngle = 360 / roundMenus.size();//每个弧形的角度
int angle = getRotationBetweenLines(coreX, coreY, textX, textY);
//这个angle的角度是从正Y轴开始，而我们的扇形是从正X轴开始，再加上偏移角度，所以需要计算一下
angle = (angle + 360 - 90 - (int) deviationDegree) % 360;
onClickState = (int) (angle / sweepAngle);//根据角度得出点击的是那个扇形
} else {
//点击了外面
onClickState = -2;
}
invalidate();
break;
case MotionEvent.ACTION_UP:
if ((new Date().getTime() - touchTime) < 300) {
//点击小于300毫秒算点击
OnClickListener onClickListener = null;
if (onClickState == -1) {
onClickListener = onCoreClickListener;
} else if (onClickState >= 0 && onClickState < roundMenus.size()) {
onClickListener = roundMenus.get(onClickState).onClickListener;
}
if (onClickListener != null) {
onClickListener.onClick(this);
}
}
onClickState = -2;
invalidate();
break;
}
return true;
}
/**
* 添加菜单
*
* @param roundMenu
*/
public void addRoundMenu(RoundMenu roundMenu) {
if (roundMenu == null) {
return;
}
if (roundMenus == null) {
roundMenus = new ArrayList<>();
}
roundMenus.add(roundMenu);
invalidate();
}
/**
* 添加中心菜单按钮
*
* @param coreMenuColor
* @param coreMenuSelectColor
* @param onClickListener
*/
public void setCoreMenu(int coreMenuColor, int coreMenuSelectColor, int coreMenuStrokeColor,
int coreMenuStrokeSize, double radiusDistance,Bitmap bitmap, OnClickListener onClickListener) {
isCoreMenu = true;
this.coreMenuColor = coreMenuColor;
this.radiusDistance = radiusDistance;
this.coreMenuSelectColor = coreMenuSelectColor;
this.coreMenuStrokeColor = coreMenuStrokeColor;
this.coreMenuStrokeSize = coreMenuStrokeSize;
coreBitmap = bitmap;
this.onCoreClickListener = onClickListener;
invalidate();
}
/**
* 获取两条线的夹角
*
* @param centerX
* @param centerY
* @param xInView
* @param yInView
* @return
*/
public static int getRotationBetweenLines(float centerX, float centerY, float xInView, float yInView) {
double rotation = 0;
double k1 = (double) (centerY - centerY) / (centerX * 2 - centerX);
double k2 = (double) (yInView - centerY) / (xInView - centerX);
double tmpDegree = Math.atan((Math.abs(k1 - k2)) / (1 + k1 * k2)) / Math.PI * 180;
if (xInView > centerX && yInView < centerY) { //第一象限
rotation = 90 - tmpDegree;
} else if (xInView > centerX && yInView > centerY) //第二象限
{
rotation = 90 + tmpDegree;
} else if (xInView < centerX && yInView > centerY) { //第三象限
rotation = 270 - tmpDegree;
} else if (xInView < centerX && yInView < centerY) { //第四象限
rotation = 270 + tmpDegree;
} else if (xInView == centerX && yInView < centerY) {
rotation = 0;
} else if (xInView == centerX && yInView > centerY) {
rotation = 180;
}
return (int) rotation;
}
/**
* 求两个点之间的距离
*
* @return
*/
public static double getDisForTwoSpot(float x1, float y1, float x2, float y2) {
float width, height;
if (x1 > x2) {
width = x1 - x2;
} else {
width = x2 - x1;
}
if (y1 > y2) {
height = y2 - y1;
} else {
height = y2 - y1;
}
return Math.sqrt((width * width) + (height * height));
}
/**
* 扇形的对象类
*/
public static class RoundMenu {
public boolean useCenter = true;//扇形是否画连接中心点的直线
public int solidColor = 0x00000000;//背景颜色,默认透明
public int selectSolidColor = 0x00000000;//背景颜色,默认透明
public int strokeColor = 0x00000000;//描边颜色,默认透明
public int strokeSize = 1;//描边的宽度,默认1
public Bitmap icon;//菜单的图片
public OnClickListener onClickListener;//点击监听
public double iconDistance = 0.63;//图标距离中心点的距离
}
}
然后是调用，调用代码就简单的放几句吧，应该看得懂的
RoundMenuView.RoundMenu roundMenu = new RoundMenuView.RoundMenu();
roundMenu.selectSolidColor = ColorUtils.getColor(getActivity(), R.color.gray_9999);
roundMenu.strokeColor = ColorUtils.getColor(getActivity(), R.color.gray_9999);
roundMenu.icon=ImageUtils.drawable2Bitmap(getActivity(),R.drawable.ic_right);
roundMenu.onClickListener=new OnClickListener() {
@Override
public void onClick(View view) {
ToastUtils.showToast(getActivity(),"点击了1");
}
};
roundMenuView.addRoundMenu(roundMenu);
roundMenu = new RoundMenuView.RoundMenu();
roundMenu.selectSolidColor = ColorUtils.getColor(getActivity(), R.color.gray_9999);
roundMenu.strokeColor = ColorUtils.getColor(getActivity(), R.color.gray_9999);
roundMenu.icon=ImageUtils.drawable2Bitmap(getActivity(),R.drawable.ic_right);
roundMenu.onClickListener=new OnClickListener() {
@Override
public void onClick(View view) {
ToastUtils.showToast(getActivity(),"点击了2");
}
};
roundMenuView.addRoundMenu(roundMenu);
roundMenu = new RoundMenuView.RoundMenu();
roundMenu.selectSolidColor = ColorUtils.getColor(getActivity(), R.color.gray_9999);
roundMenu.strokeColor = ColorUtils.getColor(getActivity(), R.color.gray_9999);
roundMenu.icon=ImageUtils.drawable2Bitmap(getActivity(),R.drawable.ic_right);
roundMenu.onClickListener=new OnClickListener() {
@Override
public void onClick(View view) {
ToastUtils.showToast(getActivity(),"点击了3");
}
};
roundMenuView.addRoundMenu(roundMenu);
roundMenu = new RoundMenuView.RoundMenu();
roundMenu.selectSolidColor = ColorUtils.getColor(getActivity(), R.color.gray_9999);
roundMenu.strokeColor = ColorUtils.getColor(getActivity(), R.color.gray_9999);
roundMenu.icon=ImageUtils.drawable2Bitmap(getActivity(),R.drawable.ic_right);
roundMenu.onClickListener=new OnClickListener() {
@Override
public void onClick(View view) {
ToastUtils.showToast(getActivity(),"点击了4");
}
};
roundMenuView.addRoundMenu(roundMenu);
roundMenuView.setCoreMenu(ColorUtils.getColor(getActivity(), R.color.gray_f2f2),
ColorUtils.getColor(getActivity(), R.color.gray_9999), ColorUtils.getColor(getActivity(), R.color.gray_9999)
, 1, 0.43,ImageUtils.drawable2Bitmap(getActivity(),R.drawable.ic_ok), new OnClickListener() {
@Override
public void onClick(View view) {
ToastUtils.showToast(getActivity(),"点击了中心圆圈");
}
});
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