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效果展示

實現(xiàn)步驟

1.生成抽獎矩形：

其中每個矩形的寬高相同，長度為整個控件寬度的1/3。

代碼展示

public class NineLuckPan extends View {    private Paint mPaint;    private ArrayList<RectF> mRects;//存儲矩形的集合    private float mStrokWidth = 5;//矩形的描邊寬度    private int mRectSize;//矩形的寬和高（矩形為正方形）    private int[] mItemColor = {Color.GREEN, Color.YELLOW};//矩形的顏色
    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();    }
    /**     * 初始化數(shù)據(jù)     */    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;//獲取矩形的寬和高        mRects.clear();//當控件大小改變的時候清空數(shù)據(jù)        initRect();//重新加載矩形數(shù)據(jù)    }
    /**     * 加載矩形數(shù)據(jù)     */    private void initRect() {        //加載前三個矩形        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);        }        //加載第四個        mRects.add(new RectF(getWidth() - mRectSize, mRectSize, getWidth(), mRectSize * 2));        //加載第五~七個        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);        }        //加載第八個        mRects.add(new RectF(0, mRectSize, mRectSize, mRectSize * 2));        //加載第九個        mRects.add(new RectF(mRectSize, mRectSize, mRectSize * 2, mRectSize * 2));    }
    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        drawRects(canvas);    }
    /**     * 畫矩形     *     * @param canvas     */    private void drawRects(Canvas canvas) {        for (int x = 0; x < mRects.size(); x++) {            RectF rectF = mRects.get(x);            if (x == 8) {//中心的矩形背景為白色                mPaint.setColor(Color.WHITE);                canvas.drawRect(rectF, mPaint);            } else {                mPaint.setColor(mItemColor[x % 2]);                canvas.drawRect(rectF, mPaint);            }        }    }}

效果展示

2.添加獎品圖片：

我們在矩形的中心點畫出圖片，圖片的寬高都為矩形寬高的1/2，其中矩形的中心點通過rectF.centerX()和rectF.centerY()獲取。

代碼展示（為了方便只展示部分代碼）

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);//畫矩形        drawImages(canvas);//畫圖片    }
    /**     * 畫圖片     *     * @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

3.實現(xiàn)抽獎動畫：

這里我們使用ValueAnimator使數(shù)字從0遞增到我們的中獎位置比如3，然后改變遞增所在的位置的矩形的背景以實現(xiàn)抽獎的效果，另外為了讓用戶感到逼真我們需要讓抽獎色塊多轉(zhuǎn)幾圈，同時我們需要將下一次的開始位置設為上一次的結(jié)束位置。

代碼展示（為了方便只展示部分代碼）

NineLuckPan:

public class NineLuckPan extends View {    private int mRepeatCount = 3;//轉(zhuǎn)的圈數(shù)    private int mLuckNum = 3;//最終中獎位置    private int mPosition = -1;//抽獎塊的位置    private int mStartLuckPosition = 0;//開始抽獎的位置    /**     * 畫矩形     * @param canvas     */    private void drawRects(Canvas canvas) {        for (int x = 0;x<mRects.size();x++){            RectF rectF = mRects.get(x);            if(x == 8){                mPaint.setColor(Color.WHITE);                canvas.drawRect(rectF, mPaint);            }else {                mPaint.setColor(mItemColor[x%2]);                if(mPosition == x){                    mPaint.setColor(Color.BLUE);                }                canvas.drawRect(rectF, mPaint);            }        }    }    public void setPosition(int position){        mPosition = position;        invalidate();    }    /**     * 開始動畫     */    public void startAnim(){        ValueAnimator valueAnimator = ValueAnimator.ofInt(mStartLuckPosition, mRepeatCount * 8 + mLuckNum).setDuration(5000);        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                int position = (int) animation.getAnimatedValue();                setPosition(position%8);            }        });        valueAnimator.addListener(new AnimatorListenerAdapter() {            @Override            public void onAnimationEnd(Animator animation) {                mStartLuckPosition = mLuckNum;            }        });        valueAnimator.start();    }}

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() {            @Override            public void onClick(View v) {                luckpan.startAnim();            }        });    }}

效果展示

雖然效果實現(xiàn)了但是我們發(fā)現(xiàn)好像點哪里都能啟動動畫，因此我們需要調(diào)整一下代碼使只有點擊中心的矩形才開始動畫。

//（為了方便只展示部分代碼）public class NineLuckPan extends View {    private boolean mClickStartFlag = false;//是否點擊中間矩形的標記
    //這樣需要我們將Activity里的啟動動畫的邏輯刪掉    @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();//判斷只有手指落下和抬起都在中間的矩形內(nèi)才開始抽獎                }                mClickStartFlag = false;            }        }        return super.onTouchEvent(event);    }}

4.實現(xiàn)動態(tài)設置參數(shù)：

效果基本實現(xiàn)了，接下來就需要實現(xiàn)動態(tài)設置數(shù)據(jù)了。

代碼展示（這里為了方便只展示部分代碼）

public class NineLuckPan extends View {    private int mLuckNum = 3;//最終中獎位置    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","雞腿","米飯","卷心菜","南瓜","糖葫蘆","大蝦","香腸"};//這是抽獎的提示信息
    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();//要注意設置完后要進行重繪    }
    public String[] getmLuckStr() {        return mLuckStr;    }
    public void setmLuckStr(String[] mLuckStr) {        this.mLuckStr = mLuckStr;        invalidate();;//要注意設置完后要進行重繪    }}

5.添加抽獎結(jié)果回調(diào)

這里需要在動畫結(jié)束的回調(diào)里加入我們自定義的回調(diào)函數(shù)。

代碼展示（這里為了方便只展示部分代碼）

public class NineLuckPan extends View {    private OnLuckPanAnimEndListener onLuckPanAnimEndListener;
    public OnLuckPanAnimEndListener getOnLuckPanAnimEndListener() {        return onLuckPanAnimEndListener;    }
    public void setOnLuckPanAnimEndListener(OnLuckPanAnimEndListener onLuckPanAnimEndListener) {        this.onLuckPanAnimEndListener = onLuckPanAnimEndListener;    }
    /**     * 開始動畫     */    private void startAnim(){        ValueAnimator valueAnimator = ValueAnimator.ofInt(mStartLuckPosition, mRepeatCount * 8 + mLuckNum).setDuration(5000);        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                int position = (int) animation.getAnimatedValue();                setPosition(position%8);            }        });        valueAnimator.addListener(new AnimatorListenerAdapter() {            @Override            public void onAnimationEnd(Animator animation) {                mStartLuckPosition = mLuckNum;                //在動畫結(jié)束的回調(diào)函數(shù)里加入我們自定義的回調(diào)函數(shù)                if(onLuckPanAnimEndListener!=null){                    onLuckPanAnimEndListener.onAnimEnd(mPosition,mLuckStr[mPosition]);                }            }        });        valueAnimator.start();    }    public interface OnLuckPanAnimEndListener{        void onAnimEnd(int position,String msg);    }}

Activity代碼：

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() {            @Override            public 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

源碼地址：

https://github.com/myml666/NineLuckPan

到這里就結(jié)束啦！

點擊這里留言交流哦

Android實現(xiàn)超簡單九宮格抽獎功能

效果展示

實現(xiàn)步驟