用Android studio设计大转盘的代码
时间: 2024-05-13 17:18:12 浏览: 18
以下是一个简单的大转盘的设计代码示例,主要利用了Android的Canvas绘图功能:
```
public class LuckyWheelView extends View {
private Paint mPaint;
private RectF mRectF;
private String[] mPrizes = {"Prize 1", "Prize 2", "Prize 3", "Prize 4", "Prize 5", "Prize 6"};
private int[] mColors = {Color.RED, Color.BLUE, Color.GREEN, Color.YELLOW, Color.MAGENTA, Color.CYAN};
private int mWheelSize = 6; // 大转盘的奖品数量
private int mSelectedIndex = -1; // 当前选中的奖品
private float mStartAngle = 0; // 大转盘开始旋转的角度
private float mSweepAngle = 60; // 大转盘每个奖品的角度
private float mRadius; // 大转盘半径
public LuckyWheelView(Context context) {
super(context);
init();
}
public LuckyWheelView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public LuckyWheelView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setStyle(Paint.Style.FILL);
mRectF = new RectF();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// 计算大转盘半径
mRadius = Math.min(getWidth(), getHeight()) / 2f - 100f;
// 绘制大转盘每个奖品的扇形区域
for (int i = 0; i < mWheelSize; i++) {
mPaint.setColor(mColors[i % mColors.length]);
mRectF.set(getWidth() / 2f - mRadius, getHeight() / 2f - mRadius, getWidth() / 2f + mRadius, getHeight() / 2f + mRadius);
canvas.drawArc(mRectF, mStartAngle, mSweepAngle, true, mPaint);
mStartAngle += mSweepAngle;
}
// 绘制大转盘中间的圆形区域
mPaint.setColor(Color.WHITE);
canvas.drawCircle(getWidth() / 2f, getHeight() / 2f, mRadius / 3f, mPaint);
// 绘制大转盘每个奖品的文字
mPaint.setColor(Color.BLACK);
mPaint.setTextSize(50f);
mPaint.setTextAlign(Paint.Align.CENTER);
mStartAngle = mSweepAngle / 2f;
for (int i = 0; i < mWheelSize; i++) {
canvas.save();
canvas.rotate(mStartAngle, getWidth() / 2f, getHeight() / 2f);
canvas.drawText(mPrizes[i], getWidth() / 2f, getHeight() / 2f - mRadius / 2f, mPaint);
canvas.restore();
mStartAngle += mSweepAngle;
}
// 绘制指针
mPaint.setColor(Color.RED);
canvas.drawLine(getWidth() / 2f, getHeight() / 2f, getWidth() / 2f + mRadius, getHeight() / 2f, mPaint);
canvas.drawCircle(getWidth() / 2f, getHeight() / 2f, 20f, mPaint);
}
public void startSpin() {
Random random = new Random();
mSelectedIndex = random.nextInt(mWheelSize);
float angle = (360f / mWheelSize) * mSelectedIndex + mSweepAngle / 2f;
ObjectAnimator animator = ObjectAnimator.ofFloat(this, "rotation", 0f, angle + 720f);
animator.setDuration(5000);
animator.setInterpolator(new DecelerateInterpolator());
animator.start();
}
public int getSelectedIndex() {
return mSelectedIndex;
}
}
```
在布局文件中,可以使用以下代码将该自定义View添加到界面上:
```
<com.example.luckywheel.LuckyWheelView
android:id="@+id/lucky_wheel_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
```
在代码中,可以通过调用`startSpin()`方法来启动大转盘旋转,并通过`getSelectedIndex()`方法获取最后停留的奖品索引。
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