Android之九宮格解鎖的實現

九宮格解鎖在Android中應用的很廣泛，也是Android特有的一種解鎖方式，其實實現起來也並不是很複雜，下面我就根據系統源碼LockPatternView，移植出來的一個更加簡單小巧九宮格解鎖的例子，和大家一起學習一下。圖片資源來自"支付寶錢包"，先看看效果圖：

源碼下載地址：http://download.csdn.net/detail/weidi1989/5374787

                                                   

下面是最重要的那個LocusPassWordView：

/**
 *
 * 九宮格解鎖
 *
 * @author way
 *
 */
public class LocusPassWordView extends View {
    private float w = 0;
    private float h = 0;

    //
    private boolean isCache = false;
    //
    private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

    //
    private Point[][] mPoints = new Point[3][3];
    // 圓的半徑
    private float r = 0;
    // 選中的點
    private List<Point> sPoints = new ArrayList<Point>();
    private boolean checking = false;
    private Bitmap locus_round_original;// 圓點初始狀態時的圖片
    private Bitmap locus_round_click;// 圓點點擊時的圖片
    private Bitmap locus_round_click_error;// 出錯時圓點的圖片
    private Bitmap locus_line;// 正常狀態下線的圖片
    private Bitmap locus_line_semicircle;
    private Bitmap locus_line_semicircle_error;
    private Bitmap locus_arrow;// 線的移動方向
    private Bitmap locus_line_error;// 錯誤狀態下的線的圖片
    private long CLEAR_TIME = 0;// 清除痕跡的時間
    private int passwordMinLength = 5;// 密碼最小長度
    private boolean isTouch = true; // 是否可操作
    private Matrix mMatrix = new Matrix();
    private int lineAlpha = 50;// 連線的透明度

    public LocusPassWordView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public LocusPassWordView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public LocusPassWordView(Context context) {
        super(context);
    }

    @Override
    public void onDraw(Canvas canvas) {
        if (!isCache) {
            initCache();
        }
        drawToCanvas(canvas);
    }

    private void drawToCanvas(Canvas canvas) {

        // mPaint.setColor(Color.RED);
        // Point p1 = mPoints[1][1];
        // Rect r1 = new Rect(p1.x - r,p1.y - r,p1.x +
        // locus_round_click.getWidth() - r,p1.y+locus_round_click.getHeight()-
        // r);
        // canvas.drawRect(r1, mPaint);
        // 畫所有點
        for (int i = 0; i < mPoints.length; i++) {
            for (int j = 0; j < mPoints[i].length; j++) {
                Point p = mPoints[i][j];
                if (p.state == Point.STATE_CHECK) {
                    canvas.drawBitmap(locus_round_click, p.x - r, p.y - r,
                            mPaint);
                } else if (p.state == Point.STATE_CHECK_ERROR) {
                    canvas.drawBitmap(locus_round_click_error, p.x - r,
                            p.y - r, mPaint);
                } else {
                    canvas.drawBitmap(locus_round_original, p.x - r, p.y - r,
                            mPaint);
                }
            }
        }
        // mPaint.setColor(Color.BLUE);
        // canvas.drawLine(r1.left+r1.width()/2, r1.top, r1.left+r1.width()/2,
        // r1.bottom, mPaint);
        // canvas.drawLine(r1.left, r1.top+r1.height()/2, r1.right,
        // r1.bottom-r1.height()/2, mPaint);

        // 畫連線
        if (sPoints.size() > 0) {
            int tmpAlpha = mPaint.getAlpha();
            mPaint.setAlpha(lineAlpha);
            Point tp = sPoints.get(0);
            for (int i = 1; i < sPoints.size(); i++) {
                Point p = sPoints.get(i);
                drawLine(canvas, tp, p);
                tp = p;
            }
            if (this.movingNoPoint) {
                drawLine(canvas, tp, new Point((int) moveingX, (int) moveingY));
            }
            mPaint.setAlpha(tmpAlpha);
            lineAlpha = mPaint.getAlpha();
        }

    }

    /**
     * 初始化Cache信息
     *
     * @param canvas
     */
    private void initCache() {

        w = this.getWidth();
        h = this.getHeight();
        float x = 0;
        float y = 0;

        // 以最小的爲準
        // 縱屏
        if (w > h) {
            x = (w - h) / 2;
            w = h;
        }
        // 橫屏
        else {
            y = (h - w) / 2;
            h = w;
        }

        locus_round_original = BitmapFactory.decodeResource(
                this.getResources(), R.drawable.locus_round_original);
        locus_round_click = BitmapFactory.decodeResource(this.getResources(),
                R.drawable.locus_round_click);
        locus_round_click_error = BitmapFactory.decodeResource(
                this.getResources(), R.drawable.locus_round_click_error);

        locus_line = BitmapFactory.decodeResource(this.getResources(),
                R.drawable.locus_line);
        locus_line_semicircle = BitmapFactory.decodeResource(
                this.getResources(), R.drawable.locus_line_semicircle);

        locus_line_error = BitmapFactory.decodeResource(this.getResources(),
                R.drawable.locus_line_error);
        locus_line_semicircle_error = BitmapFactory.decodeResource(
                this.getResources(), R.drawable.locus_line_semicircle_error);

        locus_arrow = BitmapFactory.decodeResource(this.getResources(),
                R.drawable.locus_arrow);
        // Log.d("Canvas w h :", "w:" + w + " h:" + h);

        // 計算圓圈圖片的大小
        float canvasMinW = w;
        if (w > h) {
            canvasMinW = h;
        }
        float roundMinW = canvasMinW / 8.0f * 2;
        float roundW = roundMinW / 2.f;
        //
        float deviation = canvasMinW % (8 * 2) / 2;
        x += deviation;
        x += deviation;

        if (locus_round_original.getWidth() > roundMinW) {
            float sf = roundMinW * 1.0f / locus_round_original.getWidth(); // 取得縮放比例，將所有的圖片進行縮放
            locus_round_original = BitmapUtil.zoom(locus_round_original, sf);
            locus_round_click = BitmapUtil.zoom(locus_round_click, sf);
            locus_round_click_error = BitmapUtil.zoom(locus_round_click_error,
                    sf);

            locus_line = BitmapUtil.zoom(locus_line, sf);
            locus_line_semicircle = BitmapUtil.zoom(locus_line_semicircle, sf);

            locus_line_error = BitmapUtil.zoom(locus_line_error, sf);
            locus_line_semicircle_error = BitmapUtil.zoom(
                    locus_line_semicircle_error, sf);
            locus_arrow = BitmapUtil.zoom(locus_arrow, sf);
            roundW = locus_round_original.getWidth() / 2;
        }

        mPoints[0][0] = new Point(x + 0 + roundW, y + 0 + roundW);
        mPoints[0][1] = new Point(x + w / 2, y + 0 + roundW);
        mPoints[0][2] = new Point(x + w - roundW, y + 0 + roundW);
        mPoints[1][0] = new Point(x + 0 + roundW, y + h / 2);
        mPoints[1][1] = new Point(x + w / 2, y + h / 2);
        mPoints[1][2] = new Point(x + w - roundW, y + h / 2);
        mPoints[2][0] = new Point(x + 0 + roundW, y + h - roundW);
        mPoints[2][1] = new Point(x + w / 2, y + h - roundW);
        mPoints[2][2] = new Point(x + w - roundW, y + h - roundW);
        int k = 0;
        for (Point[] ps : mPoints) {
            for (Point p : ps) {
                p.index = k;
                k++;
            }
        }
        r = locus_round_original.getHeight() / 2;// roundW;
        isCache = true;
    }

    /**
     * 畫兩點的連接
     *
     * @param canvas
     * @param a
     * @param b
     */
    private void drawLine(Canvas canvas, Point a, Point b) {
        float ah = (float) MathUtil.distance(a.x, a.y, b.x, b.y);
        float degrees = getDegrees(a, b);
        // Log.d("=============x===========", "rotate:" + degrees);
        canvas.rotate(degrees, a.x, a.y);

        if (a.state == Point.STATE_CHECK_ERROR) {
            mMatrix.setScale((ah - locus_line_semicircle_error.getWidth())
                    / locus_line_error.getWidth(), 1);
            mMatrix.postTranslate(a.x, a.y - locus_line_error.getHeight()
                    / 2.0f);
            canvas.drawBitmap(locus_line_error, mMatrix, mPaint);
            canvas.drawBitmap(locus_line_semicircle_error, a.x
                    + locus_line_error.getWidth(),
                    a.y - locus_line_error.getHeight() / 2.0f, mPaint);
        } else {
            mMatrix.setScale((ah - locus_line_semicircle.getWidth())
                    / locus_line.getWidth(), 1);
            mMatrix.postTranslate(a.x, a.y - locus_line.getHeight() / 2.0f);
            canvas.drawBitmap(locus_line, mMatrix, mPaint);
            canvas.drawBitmap(locus_line_semicircle, a.x + ah
                    - locus_line_semicircle.getWidth(),
                    a.y - locus_line.getHeight() / 2.0f, mPaint);
        }

        canvas.drawBitmap(locus_arrow, a.x, a.y - locus_arrow.getHeight()
                / 2.0f, mPaint);

        canvas.rotate(-degrees, a.x, a.y);

    }

    public float getDegrees(Point a, Point b) {
        float ax = a.x;// a.index % 3;
        float ay = a.y;// a.index / 3;
        float bx = b.x;// b.index % 3;
        float by = b.y;// b.index / 3;
        float degrees = 0;
        if (bx == ax) // y軸相等 90度或270
        {
            if (by > ay) // 在y軸的下邊 90
            {
                degrees = 90;
            } else if (by < ay) // 在y軸的上邊 270
            {
                degrees = 270;
            }
        } else if (by == ay) // y軸相等 0度或180
        {
            if (bx > ax) // 在y軸的下邊 90
            {
                degrees = 0;
            } else if (bx < ax) // 在y軸的上邊 270
            {
                degrees = 180;
            }
        } else {
            if (bx > ax) // 在y軸的右邊 270~90
            {
                if (by > ay) // 在y軸的下邊 0 - 90
                {
                    degrees = 0;
                    degrees = degrees
                            + switchDegrees(Math.abs(by - ay),
                                    Math.abs(bx - ax));
                } else if (by < ay) // 在y軸的上邊 270~0
                {
                    degrees = 360;
                    degrees = degrees
                            - switchDegrees(Math.abs(by - ay),
                                    Math.abs(bx - ax));
                }

            } else if (bx < ax) // 在y軸的左邊 90~270
            {
                if (by > ay) // 在y軸的下邊 180 ~ 270
                {
                    degrees = 90;
                    degrees = degrees
                            + switchDegrees(Math.abs(bx - ax),
                                    Math.abs(by - ay));
                } else if (by < ay) // 在y軸的上邊 90 ~ 180
                {
                    degrees = 270;
                    degrees = degrees
                            - switchDegrees(Math.abs(bx - ax),
                                    Math.abs(by - ay));
                }

            }

        }
        return degrees;
    }

    /**
     * 1=30度 2=45度 4=60度
     *
     * @param tan
     * @return
     */
    private float switchDegrees(float x, float y) {
        return (float) MathUtil.pointTotoDegrees(x, y);
    }

    /**
     * 取得數組下標
     *
     * @param index
     * @return
     */
    public int[] getArrayIndex(int index) {
        int[] ai = new int[2];
        ai[0] = index / 3;
        ai[1] = index % 3;
        return ai;
    }

    /**
     *
     * 檢查
     *
     * @param x
     * @param y
     * @return
     */
    private Point checkSelectPoint(float x, float y) {
        for (int i = 0; i < mPoints.length; i++) {
            for (int j = 0; j < mPoints[i].length; j++) {
                Point p = mPoints[i][j];
                if (RoundUtil.checkInRound(p.x, p.y, r, (int) x, (int) y)) {
                    return p;
                }
            }
        }
        return null;
    }

    /**
     * 重置
     */
    private void reset() {
        for (Point p : sPoints) {
            p.state = Point.STATE_NORMAL;
        }
        sPoints.clear();
        this.enableTouch();
    }

    /**
     * 判斷點是否有交叉 返回 0,新點 ,1 與上一點重疊 2,與非最後一點重疊
     *
     * @param p
     * @return
     */
    private int crossPoint(Point p) {
        // 重疊的不最後一個則 reset
        if (sPoints.contains(p)) {
            if (sPoints.size() > 2) {
                // 與非最後一點重疊
                if (sPoints.get(sPoints.size() - 1).index != p.index) {
                    return 2;
                }
            }
            return 1; // 與最後一點重疊
        } else {
            return 0; // 新點
        }
    }

    /**
     * 添加一個點
     *
     * @param point
     */
    private void addPoint(Point point) {
        this.sPoints.add(point);
    }

    /**
     * 轉換爲String
     *
     * @param points
     * @return
     */
    private String toPointString() {
        if (sPoints.size() > passwordMinLength) {
            StringBuffer sf = new StringBuffer();
            for (Point p : sPoints) {
                sf.append(",");
                sf.append(p.index);
            }
            return sf.deleteCharAt(0).toString();
        } else {
            return "";
        }
    }

    boolean movingNoPoint = false;
    float moveingX, moveingY;

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // 不可操作
        if (!isTouch) {
            return false;
        }

        movingNoPoint = false;

        float ex = event.getX();
        float ey = event.getY();
        boolean isFinish = false;
        boolean redraw = false;
        Point p = null;
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN: // 點下
            // 如果正在清除密碼,則取消
            if (task != null) {
                task.cancel();
                task = null;
                Log.d("task", "touch cancel()");
            }
            // 刪除之前的點
            reset();
            p = checkSelectPoint(ex, ey);
            if (p != null) {
                checking = true;
            }
            break;
        case MotionEvent.ACTION_MOVE: // 移動
            if (checking) {
                p = checkSelectPoint(ex, ey);
                if (p == null) {
                    movingNoPoint = true;
                    moveingX = ex;
                    moveingY = ey;
                }
            }
            break;
        case MotionEvent.ACTION_UP: // 提起
            p = checkSelectPoint(ex, ey);
            checking = false;
            isFinish = true;
            break;
        }
        if (!isFinish && checking && p != null) {

            int rk = crossPoint(p);
            if (rk == 2) // 與非最後一重疊
            {
                // reset();
                // checking = false;

                movingNoPoint = true;
                moveingX = ex;
                moveingY = ey;

                redraw = true;
            } else if (rk == 0) // 一個新點
            {
                p.state = Point.STATE_CHECK;
                addPoint(p);
                redraw = true;
            }
            // rk == 1 不處理

        }

        // 是否重畫
        if (redraw) {

        }
        if (isFinish) {
            if (this.sPoints.size() == 1) {
                this.reset();
            } else if (this.sPoints.size() < passwordMinLength
                    && this.sPoints.size() > 0) {
                // mCompleteListener.onPasswordTooMin(sPoints.size());
                error();
                clearPassword();
                Toast.makeText(this.getContext(), "密碼太短,請重新輸入!",
                        Toast.LENGTH_SHORT).show();
            } else if (mCompleteListener != null) {
                if (this.sPoints.size() >= passwordMinLength) {
                    this.disableTouch();
                    mCompleteListener.onComplete(toPointString());
                }

            }
        }
        this.postInvalidate();
        return true;
    }

    /**
     * 設置已經選中的爲錯誤
     */
    private void error() {
        for (Point p : sPoints) {
            p.state = Point.STATE_CHECK_ERROR;
        }
    }

    /**
     * 設置爲輸入錯誤
     */
    public void markError() {
        markError(CLEAR_TIME);
    }

    /**
     * 設置爲輸入錯誤
     */
    public void markError(final long time) {
        for (Point p : sPoints) {
            p.state = Point.STATE_CHECK_ERROR;
        }
        this.clearPassword(time);
    }

    /**
     * 設置爲可操作
     */
    public void enableTouch() {
        isTouch = true;
    }

    /**
     * 設置爲不可操作
     */
    public void disableTouch() {
        isTouch = false;
    }

    private Timer timer = new Timer();
    private TimerTask task = null;

    /**
     * 清除密碼
     */
    public void clearPassword() {
        clearPassword(CLEAR_TIME);
    }

    /**
     * 清除密碼
     */
    public void clearPassword(final long time) {
        if (time > 1) {
            if (task != null) {
                task.cancel();
                Log.d("task", "clearPassword cancel()");
            }
            lineAlpha = 130;
            postInvalidate();
            task = new TimerTask() {
                public void run() {
                    reset();
                    postInvalidate();
                }
            };
            Log.d("task", "clearPassword schedule(" + time + ")");
            timer.schedule(task, time);
        } else {
            reset();
            postInvalidate();
        }

    }

    //
    private OnCompleteListener mCompleteListener;

    /**
     * @param mCompleteListener
     */
    public void setOnCompleteListener(OnCompleteListener mCompleteListener) {
        this.mCompleteListener = mCompleteListener;
    }

    /**
     * 取得密碼
     *
     * @return
     */
    private String getPassword() {
        SharedPreferences settings = this.getContext().getSharedPreferences(
                this.getClass().getName(), 0);
        return settings.getString("password", ""); // , "0,1,2,3,4,5,6,7,8"
    }

    /**
     * 密碼是否爲空
     *
     * @return
     */
    public boolean isPasswordEmpty() {
        return StringUtil.isEmpty(getPassword());
    }

    public boolean verifyPassword(String password) {
        boolean verify = false;
        if (com.way.util.StringUtil.isNotEmpty(password)) {
            // 或者是超級密碼
            if (password.equals(getPassword())) {
                verify = true;
            }
        }
        return verify;
    }

    /**
     * 設置密碼
     *
     * @param password
     */
    public void resetPassWord(String password) {
        SharedPreferences settings = this.getContext().getSharedPreferences(
                this.getClass().getName(), 0);
        Editor editor = settings.edit();
        editor.putString("password", password);
        editor.commit();
    }

    public int getPasswordMinLength() {
        return passwordMinLength;
    }

    public void setPasswordMinLength(int passwordMinLength) {
        this.passwordMinLength = passwordMinLength;
    }

    /**
     * 軌跡球畫完成事件
     *
     * @author way
     */
    public interface OnCompleteListener {
        /**
         * 畫完了
         *
         * @param str
         */
        public void onComplete(String password);
    }
}

這裏只貼出了最重要的那部分代碼，有興趣的朋友可以下載源碼看看