概述：

滑动解锁九宫格的分析：
1、需要自定义控件；
2、需要重写事件onTouchEvent();
3、需要给九个点设置序号和坐标，这里用Map类就行；
4、需要判断是否到滑到过九点之一，并存储滑到过的点的序号，而且需要一个方法可以返回它们，这里用List类就行；

滑动解锁当前还是比较流行的，今天写了个简单的滑动解锁九宫格的例程，分享出来让初学者看看。

我的是这样的：

Demo

首先，自定义一个View

/** * 九宫格 */ { height;Paint mPaintSmallCircle;Paint mPaintText;Map<Integer, Float[]> pointContainer;List<Integer> getPointerSlipped() { return pointerSlipped; } (List<Integer> pointerSlipped) { this.pointerSlipped = pointerSlipped; } public NineGridView(Context context) { super(context); } public NineGridView(Context context, AttributeSet attrs) { super(context, attrs); mPaintBigCircle = new Paint(); mPaintBigCircle.setColor(Color.BLUE); mPaintBigCircle.setStyle(Paint.Style.STROKE);//不充满 mPaintBigCircle.setAntiAlias(true);//抗锯齿打开 mPaintSmallCircle = new Paint(); mPaintSmallCircle.setColor(Color.GREEN); mPaintSmallCircle.setStyle(Paint.Style.FILL);//充满，即画的几何体为实心 mPaintSmallCircle.setAntiAlias(true); mPaintLine = new Paint(); mPaintLine.setColor(Color.GREEN); mPaintLine.setStyle(Paint.Style.STROKE); mPaintLine.setStrokeWidth(20); mPaintLine.setAntiAlias(true); mPaintText = new Paint(); mPaintText.setColor(Color.WHITE); mPaintText.setTextAlign(Paint.Align.CENTER);//向中央对齐 mPaintText.setTextSize(50); mPaintText.setAntiAlias(true); path = new Path(); pointContainer = new HashMap<>(); pointerSlipped = new ArrayList<>(); } (int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec); height = getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec); } pivotY;selectedX;selectedY;selectedXOld;selectedYOld;isHasMoved = (MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: pivotX = event.getX(); pivotY = event.getY(); //每次触屏时需要清空一下pointerSlipped，即重置密码 pointerSlipped.clear(); Log.d("pointTouched", pivotX + "," + pivotY); getSelectedPointIndex(pivotX, pivotY); invalidate();//重绘 break; case MotionEvent.ACTION_MOVE: pivotX = event.getX(); pivotY = event.getY(); getSelectedPointIndex(pivotX, pivotY); invalidate(); break; case MotionEvent.ACTION_UP: /** * 当手指离开屏幕时，重置path */ path.reset(); isHasMoved = false; String indexSequence = ""; //打印出上一次手势密码的值 for(int index:pointerSlipped){ indexSequence += "/"+index; } Log.d("index",indexSequence); break; } invalidate(); return true; } /** * 得到并存储经过的圆点的序号 * @param pivotX * @param pivotY */ (float pivotX, float pivotY) { int index = 0; if (pivotX > patternMargin && pivotX < patternMargin + bigCircleRadius * 2) { if (pivotY > height / 2 && pivotY < height / 2 + bigCircleRadius * 2) { selectedX = pointContainer.get(1)[0]; selectedY = pointContainer.get(1)[1]; index = 1; Log.d("selectedPoint", selectedX + "," + selectedY); } else if (pivotY > height / 2 + added && pivotY < height / 2 + added + bigCircleRadius * 2) { selectedX = pointContainer.get(4)[0]; selectedY = pointContainer.get(4)[1]; index = 4; } else if (pivotY > height / 2 + added * 2 && pivotY < height / 2 + added * 2 + bigCircleRadius * 2) { selectedX = pointContainer.get(7)[0]; selectedY = pointContainer.get(7)[1]; index = 7; } } else if (pivotX > patternMargin + added && pivotX < patternMargin + added + bigCircleRadius * 2) { if (pivotY > height / 2 && pivotY < height / 2 + bigCircleRadius * 2) { selectedX = pointContainer.get(2)[0]; selectedY = pointContainer.get(2)[1]; index = 2; } else if (pivotY > height / 2 + added && pivotY < height / 2 + added + bigCircleRadius * 2) { selectedX = pointContainer.get(5)[0]; selectedY = pointContainer.get(5)[1]; index = 5; } else if (pivotY > height / 2 + added * 2 && pivotY <height / 2 + added * 2 + bigCircleRadius * 2) { selectedX = pointContainer.get(8)[0]; selectedY = pointContainer.get(8)[1]; index = 8; } } else if (pivotX > patternMargin + added * 2 && pivotX < patternMargin + added * 2 + bigCircleRadius * 2) { if (pivotY > height / 2 && pivotY < height / 2 + bigCircleRadius * 2) { selectedX = pointContainer.get(3)[0]; selectedY = pointContainer.get(3)[1]; index = 3; } else if (pivotY > height / 2 + added && pivotY < height / 2 + added + bigCircleRadius * 2) { selectedX = pointContainer.get(6)[0]; selectedY = pointContainer.get(6)[1]; index = 6; } else if (pivotY > height / 2 + added * 2 && pivotY < height / 2 + added * 2 + bigCircleRadius * 2) { selectedX = pointContainer.get(9)[0]; selectedY = pointContainer.get(9)[1]; index = 9; } } if (selectedX!=selectedXOld||selectedY!=selectedYOld){ //当这次的坐标与上次的坐标不同时存储这次点序号 pointerSlipped.add(index); selectedXOld = selectedX; selectedYOld = selectedY; if (!isHasMoved){ //当第一次触碰到九个点之一时，path调用moveTo; path.moveTo(selectedX,selectedY); isHasMoved = true; }else{ //path移动至当前圆点坐标 path.lineTo(selectedX,selectedY); } } } private String text = "请绘制解锁图案"; y;added;patternMargin = bigCircleRadius = smallCircleRadius = index;(Canvas canvas) { super.onDraw(canvas); added = (width - patternMargin * 2) / 3; x = patternMargin + added / 2; y = added / 2 + height / 2; index = 1; canvas.drawColor(Color.BLACK); canvas.drawText(text, width / 2, height / 4, mPaintText); /** * 绘制九个圆点图案 */ for (int column = 0; column < 3; column++) { for (int row = 0; row < 3; row++) { canvas.drawCircle(x, y, bigCircleRadius, mPaintBigCircle); canvas.drawCircle(x, y, smallCircleRadius, mPaintSmallCircle); pointContainer.put(index, new Float[]{x, y}); index++; x += added; } y += added; x = patternMargin + added / 2; } x = patternMargin + added / 2; y = added / 2 + height / 2; canvas.drawPath(path, mPaintLine); } }