自定义形状按钮 [英] Custom shape button
问题描述
我正在尝试将馅饼的每个切片都设为一个按钮.饼图是一堆在图像视图中的矢量可绘制对象.我不一定需要单击实际的饼图.我当时在考虑使用Path绘制透明形状并将其放置在顶部并使其成为按钮，但据我了解，可绘制对象不可单击.
I am trying to make each slice of the pie a button. The pie is a bunch of vector drawables in an image view. I don't necessarily need the actual pie slices to be clicked. I was thinking of using Path to draw a transparent shape and place it on top and make that the button, but from what I understand, drawables aren't clickable.
我读了一篇博客文章，该文章显然使用了路径来创建自定义形状的图像视图，并且我知道图像视图是可单击的，但似乎在博客文章中的实现中，图像视图仍然是矩形的，但是位图在示例中使用的博客作者只是在图像视图内被裁剪为自定义形状.这是我指的帖子: http: //www.androidhub4you.com/2014/10/android-custom-shape-imageview-rounded.html
I read one blog post that apparently used paths to make a custom shaped image view, and I know image views are clickable, but it seems like with the implementation in the blog post the image views are still rectangular, but the bitmaps the blogger was using in the example were just trimmed to a custom shape inside the image view. This is the post I'm referring to: http://www.androidhub4you.com/2014/10/android-custom-shape-imageview-rounded.html
请像个五岁的孩子向我解释一下.我是编程新手.不是因为Android Studio的所有功能都是自动的，我不会在这里.
Please explain this to me like a five year old. I'm relatively new to programming. Were it not for Android Studio's automatic everything, I would not be here.
谢谢.
推荐答案
您可以只使用drawArc和drawCircle绘制一个径向菜单，并使用触摸点和中心点之间的距离以及角度来检测当前正在单击的切片.我为您编写了一个示例:
You can just using drawArc and drawCircle to draw a radial menu, and using distance between touch point and center point and angle to detect which slice is currently being click. I wrote a Sample for you:
public class RadioButtons extends View {
//the number of slice
private int mSlices = 6;
//the angle of each slice
private int degreeStep = 360 / mSlices;
private int quarterDegreeMinus = -90;
private float mOuterRadius;
private float mInnerRadius;
//using radius square to prevent square root calculation
private float outerRadiusSquare;
private float innerRadiusSquare;
private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private RectF mSliceOval = new RectF();
private static final double quarterCircle = Math.PI / 2;
private float innerRadiusRatio = 0.3F;
//color for your slice
private int[] colors = new int[]{Color.GREEN, Color.GRAY, Color.BLUE, Color.CYAN, Color.DKGRAY, Color.RED};
private int mCenterX;
private int mCenterY;
private OnSliceClickListener mOnSliceClickListener;
private int mTouchSlop;
private boolean mPressed;
private float mLatestDownX;
private float mLatestDownY;
public interface OnSliceClickListener{
void onSlickClick(int slicePosition);
}
public RadioButtons(Context context){
this(context, null);
}
public RadioButtons(Context context, AttributeSet attrs){
this(context, attrs, 0);
}
public RadioButtons(Context context, AttributeSet attrs, int defStyle){
super(context, attrs, defStyle);
ViewConfiguration viewConfiguration = ViewConfiguration.get(context);
mTouchSlop = viewConfiguration.getScaledTouchSlop();
mPaint.setStrokeWidth(10);
}
public void setOnSliceClickListener(OnSliceClickListener onSliceClickListener){
mOnSliceClickListener = onSliceClickListener;
}
@Override
public void onSizeChanged(int w, int h, int oldw, int oldh){
mCenterX = w / 2;
mCenterY = h / 2;
mOuterRadius = mCenterX > mCenterY ? mCenterY : mCenterX;
mInnerRadius = mOuterRadius * innerRadiusRatio;
outerRadiusSquare = mOuterRadius * mOuterRadius;
innerRadiusSquare = mInnerRadius * mInnerRadius;
mSliceOval.left = mCenterX - mOuterRadius;
mSliceOval.right = mCenterX + mOuterRadius;
mSliceOval.top = mCenterY - mOuterRadius;
mSliceOval.bottom = mCenterY + mOuterRadius;
}
@Override
public boolean onTouchEvent(MotionEvent event){
float currX = event.getX();
float currY = event.getY();
switch(event.getActionMasked()){
case MotionEvent.ACTION_DOWN:
mLatestDownX = currX;
mLatestDownY = currY;
mPressed = true;
break;
case MotionEvent.ACTION_MOVE:
if(Math.abs(currX - mLatestDownX) > mTouchSlop || Math.abs(currY - mLatestDownY) > mTouchSlop) mPressed = false;
break;
case MotionEvent.ACTION_UP:
if(mPressed){
int dx = (int) currX - mCenterX;
int dy = (int) currY - mCenterY;
int distanceSquare = dx * dx + dy * dy;
//if the distance between touchpoint and centerpoint is smaller than outerRadius and longer than innerRadius, then we're in the clickable area
if(distanceSquare > innerRadiusSquare && distanceSquare < outerRadiusSquare){
//get the angle to detect which slice is currently being click
double angle = Math.atan2(dy, dx);
if(angle >= -quarterCircle && angle < 0){
angle += quarterCircle;
}else if(angle >= -Math.PI && angle < -quarterCircle){
angle += Math.PI + Math.PI + quarterCircle;
}else if(angle >= 0 && angle < Math.PI){
angle += quarterCircle;
}
double rawSliceIndex = angle / (Math.PI * 2) * mSlices;
if(mOnSliceClickListener != null){
mOnSliceClickListener.onSlickClick((int) rawSliceIndex);
}
}
}
break;
}
return true;
}
@Override
public void onDraw(Canvas canvas){
int startAngle = quarterDegreeMinus;
//draw slice
for(int i = 0; i < mSlices; i++){
mPaint.setStyle(Paint.Style.FILL);
mPaint.setColor(colors[i % colors.length]);
canvas.drawArc(mSliceOval, startAngle, degreeStep, true, mPaint);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setColor(Color.WHITE);
canvas.drawArc(mSliceOval, startAngle, degreeStep, true, mPaint);
startAngle += degreeStep;
}
//draw center circle
mPaint.setStyle(Paint.Style.FILL);
mPaint.setColor(Color.BLACK);
canvas.drawCircle(mCenterX, mCenterY, mInnerRadius, mPaint);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setColor(Color.WHITE);
canvas.drawCircle(mCenterX, mCenterY, mInnerRadius, mPaint);
}
}
这篇关于自定义形状按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
