1.開發(fā)環(huán)境
Android Studio 3.0
Gradle版本：4.3
開發(fā)測試手機分辨率:720 * 1280
2.功能描述
? ? ? ? 弧形菜單布局使用常規(guī)布局模式也可以實現(xiàn)，但在手機分辨率眾多，機型繁雜的情況下，這種自定義形狀的菜單設(shè)計就需要自己精細雕琢?；⌒尾藛卧O(shè)計在網(wǎng)上文章非常多，本人結(jié)合自己設(shè)計經(jīng)驗，簡單描述該功能重點實現(xiàn)部分，同時大多數(shù)文章只是在講述如果實現(xiàn)自定義布局，而對于如何結(jié)合控件縮放實現(xiàn)此功能的文章基本上很難找到。
3.軟件界面
????????自定義弧形菜單，繼承ViewGroup，實現(xiàn)onMeasure和onLayout方法，同時為自定義控件添加菜單響應事件。
```
protected void onMeasure(int widthMeasureSpec,int heightMeasureSpec) {
????super.onMeasure(widthMeasureSpec, heightMeasureSpec);
????int measureWidth = measureWidth(widthMeasureSpec);
????int measureHeight = measureHeight(heightMeasureSpec);
????// 計算自定義的ViewGroup中所有子控件的大小
? ? measureChildren(widthMeasureSpec, heightMeasureSpec);
????// 設(shè)置自定義的控件MyViewGroup的大小
? ? setMeasuredDimension(measureWidth, measureHeight);
}
protected void onLayout(boolean changed,int l,int t,int r,int b) {
final int childCount = getChildCount();
//計算容器寬度和高度及內(nèi)圈與外圈半徑
? ? int viewWidth? = r - l;
int viewHeight = b - t;
int cx = (r + l)/2;
int cy = (t + b)/2;
int mRadius0 =0;
int mRadius1 =0;
mRadius0 = viewHeight/2 -20;//中間背景圓半徑
? ? mRadius1 = mRadius0 + (viewWidth/2 - mRadius0)/2;//圖標所在圓半徑
? ? int iIconSize = mRadius0*2/3;//圖標大小
? ? int mIntervalHeight =10;//圖標之間間隔高度
? ? if ( (5 * iIconSize +120) > viewWidth)
{
iIconSize = (viewWidth -120)/5;
mRadius0 =3 * iIconSize/2;
}
mIntervalHeight = (viewHeight -2 * mRadius0)/4;
mRadius1 = mRadius0 + (viewWidth/2 - mRadius0)/2;
//確定擺放方向及
? ? int mLeft =0;
// 遍歷子View
? ? for (int i =0; i < childCount; i++) {
View childView = getChildAt(i);
// 獲得子View的高度
? ? ? ? int childViewHeight = childView.getMeasuredHeight();
// 獲得子View的寬度
? ? ? ? int childViewWidth = childView.getMeasuredWidth();
if ( i ==0)
{
RelativeLayout.LayoutParams params? =new RelativeLayout.LayoutParams( mRadius0*2 , mRadius0*2);
childView.setLayoutParams(params);
childView.layout(cx - mRadius0, cy - mRadius0, cx + mRadius0, cy + mRadius0);
}
else if ( i ==1 || i==3 || i==4 || i==6)
{
RelativeLayout.LayoutParams params? =new RelativeLayout.LayoutParams( iIconSize , iIconSize);
childView.setLayoutParams(params);
//計算圖標所在X位置
? ? ? ? ? ? int y0 = mIntervalHeight + iIconSize/2;
int x0 = (int)(viewWidth/2 - Math.sqrt( mRadius1 * mRadius1 - (viewHeight/2 - y0) * (viewHeight/2 - y0)));
if ( i==3)
{
y0 = viewHeight - y0;
}
else if ( i==4)
{
x0 = viewWidth - x0;
}
else if ( i ==6)
{
x0 = viewWidth - x0;
y0 = viewHeight - y0;
}
int x = x0 - iIconSize/2;
int y = y0 - iIconSize/2;
childView.layout(x, y, x + iIconSize, y + iIconSize);
}
else if ( i ==2 || i==5 )
{
RelativeLayout.LayoutParams params? =new RelativeLayout.LayoutParams( iIconSize , iIconSize);
childView.setLayoutParams(params);
//計算圖標所在X位置
? ? ? ? ? ? int y0 = viewHeight/2;
int x0 = viewWidth/2 - mRadius1;
if ( i ==5)
{
x0 = viewWidth - x0;
}
int x = x0 - iIconSize/2;
int y = y0 - iIconSize/2;
childView.layout(x, y, x + iIconSize, y + iIconSize);
}
else if ( i ==7)
{
RelativeLayout.LayoutParams params? =new RelativeLayout.LayoutParams( iIconSize , iIconSize);
childView.setLayoutParams(params);
//計算圖標所在X位置
? ? ? ? ? ? int y0 = viewHeight/2;
int x0 = viewWidth/2;
int x = x0 - iIconSize/2;
int y = y0 - iIconSize/2;
childView.layout(x, y, x + iIconSize, y + iIconSize);
}
}
}
```
