Android|Android 实现九宫格抽奖功能
目录
- 效果展示
- 实现步骤
- 1.生成抽奖矩形:
- 2.添加奖品图片:
- 3.实现抽奖动画:
- 4.实现动态设置参数:
- 5.添加抽奖结果回调
效果展示
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实现步骤
1.生成抽奖矩形:
其中每个矩形的宽高相同,长度为整个控件宽度的1/3。
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代码展示
public class NineLuckPan extends View { private Paint mPaint; private ArrayListmRects; //存储矩形的集合 private float mStrokWidth = 5; //矩形的描边宽度 private int mRectSize; //矩形的宽和高(矩形为正方形) private int[] mItemColor = {Color.GREEN, Color.YELLOW}; //矩形的颜色 public NineLuckPan(Context context) {this(context, null); } public NineLuckPan(Context context, @Nullable AttributeSet attrs) {this(context, attrs, 0); } public NineLuckPan(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr); init(); } /*** 初始化数据*/ private void init() {mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setStyle(Paint.Style.FILL); mPaint.setStrokeWidth(mStrokWidth); mRects = new ArrayList<>(); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh); mRectSize = Math.min(w, h) / 3; //获取矩形的宽和高mRects.clear(); //当控件大小改变的时候清空数据initRect(); //重新加载矩形数据 } /*** 加载矩形数据*/ private void initRect() {//加载前三个矩形for (int x = 0; x < 3; x++) {float left = x * mRectSize; float top = 0; float right = (x + 1) * mRectSize; float bottom = mRectSize; RectF rectF = new RectF(left, top, right, bottom); mRects.add(rectF); }//加载第四个mRects.add(new RectF(getWidth() - mRectSize, mRectSize, getWidth(), mRectSize * 2)); //加载第五~七个for (int y = 3; y > 0; y--) {float left = getWidth() - (4 - y) * mRectSize; float top = mRectSize * 2; float right = (y - 3) * mRectSize + getWidth(); float bottom = mRectSize * 3; RectF rectF = new RectF(left, top, right, bottom); mRects.add(rectF); }//加载第八个mRects.add(new RectF(0, mRectSize, mRectSize, mRectSize * 2)); //加载第九个mRects.add(new RectF(mRectSize, mRectSize, mRectSize * 2, mRectSize * 2)); } @Override protected void onDraw(Canvas canvas) {super.onDraw(canvas); drawRects(canvas); } /*** 画矩形** @param canvas*/ private void drawRects(Canvas canvas) {for (int x = 0; x < mRects.size(); x++) {RectF rectF = mRects.get(x); if (x == 8) {//中心的矩形背景为白色mPaint.setColor(Color.WHITE); canvas.drawRect(rectF, mPaint); } else {mPaint.setColor(mItemColor[x % 2]); canvas.drawRect(rectF, mPaint); }} }}
效果展示
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2.添加奖品图片:
我们在矩形的中心点画出图片,图片的宽高都为矩形宽高的1/2,其中矩形的中心点通过rectF.centerX()和rectF.centerY()获取。
文章图片
代码展示(为了方便只展示部分代码)
public class NineLuckPan extends View { private int[] mImgs = {R.drawable.ic_df, R.drawable.ic_jt, R.drawable.ic_mf, R.drawable.ic_scjx, R.drawable.ic_scng, R.drawable.ic_thl, R.drawable.ic_x, R.drawable.ic_xc, R.drawable.ic_j}; @Override protected void onDraw(Canvas canvas) {super.onDraw(canvas); drawRects(canvas); //画矩形drawImages(canvas); //画图片 } /*** 画图片** @param canvas*/ private void drawImages(Canvas canvas) {for (int x = 0; x < mRects.size(); x++) {RectF rectF = mRects.get(x); float left = rectF.centerX() - mRectSize / 4; float top = rectF.centerY() - mRectSize / 4; canvas.drawBitmap(Bitmap.createScaledBitmap(BitmapFactory.decodeResource(getResources(), mImgs[x]), mRectSize / 2, mRectSize / 2, false), left, top, null); } }}
效果展示
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3.实现抽奖动画:
这里我们使用ValueAnimator使数字从0递增到我们的中奖位置比如3,然后改变递增所在的位置的矩形的背景以实现抽奖的效果,另外为了让用户感到逼真我们需要让抽奖色块多转几圈,同时我们需要将下一次的开始位置设为上一次的结束位置。
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代码展示(为了方便只展示部分代码)
NineLuckPan:
public class NineLuckPan extends View { private int mRepeatCount = 3; //转的圈数 private int mLuckNum = 3; //最终中奖位置 private int mPosition = -1; //抽奖块的位置 private int mStartLuckPosition = 0; //开始抽奖的位置 /*** 画矩形* @param canvas*/ private void drawRects(Canvas canvas) {for (int x = 0; x
Activity:
public class MainActivity extends AppCompatActivity { private NineLuckPan luckpan; @Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); luckpan = (NineLuckPan) findViewById(R.id.luckpan); luckpan.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {luckpan.startAnim(); }}); }}
效果展示
【Android|Android 实现九宫格抽奖功能】
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虽然效果实现了但是我们发现好像点哪里都能启动动画,因此我们需要调整一下代码使只有点击中心的矩形才开始动画。
//(为了方便只展示部分代码)public class NineLuckPan extends View { private boolean mClickStartFlag = false; //是否点击中间矩形的标记 //这样需要我们将Activity里的启动动画的逻辑删掉 @Override public boolean onTouchEvent(MotionEvent event) {if(event.getAction() == MotionEvent.ACTION_DOWN){if(mRects.get(8).contains(event.getX(),event.getY())){mClickStartFlag = true; }else {mClickStartFlag = false; }return true; }if(event.getAction() == MotionEvent.ACTION_UP){if(mClickStartFlag){if(mRects.get(8).contains(event.getX(),event.getY())){startAnim(); //判断只有手指落下和抬起都在中间的矩形内才开始抽奖}mClickStartFlag = false; }}return super.onTouchEvent(event); }}
4.实现动态设置参数:
效果基本实现了,接下来就需要实现动态设置数据了。
代码展示(这里为了方便只展示部分代码)
public class NineLuckPan extends View { private int mLuckNum = 3; //最终中奖位置 private int [] mImgs = {R.drawable.ic_df,R.drawable.ic_jt,R.drawable.ic_mf,R.drawable.ic_scjx,R.drawable.ic_scng,R.drawable.ic_thl,R.drawable.ic_x,R.drawable.ic_xc,R.drawable.ic_j}; private String[] mLuckStr = {"豆腐","鸡腿","米饭","卷心菜","南瓜","糖葫芦","大虾","香肠"}; //这是抽奖的提示信息 public int getmLuckNum() {return mLuckNum; } public void setmLuckNum(int mLuckNum) {this.mLuckNum = mLuckNum; } public int[] getmImgs() {return mImgs; } public void setmImgs(int[] mImgs) {this.mImgs = mImgs; invalidate(); //要注意设置完后要进行重绘 } public String[] getmLuckStr() {return mLuckStr; } public void setmLuckStr(String[] mLuckStr) {this.mLuckStr = mLuckStr; invalidate(); ; //要注意设置完后要进行重绘 }}
5.添加抽奖结果回调
这里需要在动画结束的回调里加入我们自定义的回调函数。
代码展示(这里为了方便只展示部分代码)
public class NineLuckPan extends View { private OnLuckPanAnimEndListener onLuckPanAnimEndListener; public OnLuckPanAnimEndListener getOnLuckPanAnimEndListener() {return onLuckPanAnimEndListener; } public void setOnLuckPanAnimEndListener(OnLuckPanAnimEndListener onLuckPanAnimEndListener) {this.onLuckPanAnimEndListener = onLuckPanAnimEndListener; } /*** 开始动画*/ private void startAnim(){ValueAnimator valueAnimator = ValueAnimator.ofInt(mStartLuckPosition, mRepeatCount * 8 + mLuckNum).setDuration(5000); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {int position = (int) animation.getAnimatedValue(); setPosition(position%8); }}); valueAnimator.addListener(new AnimatorListenerAdapter() {@Overridepublic void onAnimationEnd(Animator animation) {mStartLuckPosition = mLuckNum; //在动画结束的回调函数里加入我们自定义的回调函数if(onLuckPanAnimEndListener!=null){onLuckPanAnimEndListener.onAnimEnd(mPosition,mLuckStr[mPosition]); }}}); valueAnimator.start(); } public interface OnLuckPanAnimEndListener{void onAnimEnd(int position,String msg); }}
Activity代码:
public class MainActivity extends AppCompatActivity { private NineLuckPan luckpan; @Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); luckpan = (NineLuckPan) findViewById(R.id.luckpan); luckpan.setOnLuckPanAnimEndListener(new NineLuckPan.OnLuckPanAnimEndListener() {@Overridepublic void onAnimEnd(int position, String msg) {Toast.makeText(MainActivity.this, "位置:"+position+"提示信息:"+msg, Toast.LENGTH_SHORT).show(); }}); }}
效果展示
文章图片
源码地址:
https://github.com/myml666/NineLuckPan
到这里就结束啦!
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