本文概述：
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 */ public class NineGridView extends View { private int width;//该控件的宽 private int height;//该控件的高 private Paint mPaintBigCircle;//用于画外圆 private Paint mPaintSmallCircle;//用于画内圆 private Paint mPaintLine;//用于画线 private Paint mPaintText;//用于画文本 private Path path;//手势划线时需要用到它 private Map<Integer, Float[]> pointContainer;//存储九个点的坐标 private List<Integer> pointerSlipped;//存储得到的九宫格密码 public List<Integer> getPointerSlipped() { return pointerSlipped; } public void setPointerSlipped(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<>(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec); height = getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec); } private float pivotX;//触屏得到的x坐标 private float pivotY;//触屏得到的y坐标 private float selectedX;//当前选中的圆点的x坐标 private float selectedY;//当前选中的圆点的y坐标 private float selectedXOld;//从前选中的圆点的x坐标 private float selectedYOld;//从前选中的圆点的y坐标 private boolean isHasMoved = false;//用于判断path是否调用过moveTo()方法 @Override public boolean onTouchEvent(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 */ private void getSelectedPointIndex(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"; private float x;//绘制的圆形的x坐标 private float y;//绘制圆形的纵坐标 private float added;//水平竖直方向每个圆点中心间距 private float patternMargin = 100;//九宫格距离边界距离 private float bigCircleRadius = 90;//外圆半径 private float smallCircleRadius = 25;//内圆半径 private int index;//圆点的序号 @Override protected void onDraw(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); } }
为什么要规避重复？
因为在触屏时，会调用很多次onTouchEvent()方法，这样存储的手势密码肯定会不准确，我在以上代码中作出了处理，已经避免了重复，看打印信息：
这里写图片描述
显然，密码没有相邻数重复，当然还有一种情况就是手指在两个点之间来回等问题，这种状况也需要避免，这里没有作处理。当然，我做得还不够。。。
自定义view中用到的dp和px互相转换的工具类：
public class SizeConvert { /** * 将dp转换为sp */ public static int dip2px(Context context, float dipValue){ final float scale = context.getResources().getDisplayMetrics().density; return (int)(dipValue * scale + 0.5f); } /** * sp转dp */ public static int px2dip(Context context, float pxValue){ final float scale = context.getResources().getDisplayMetrics().density; return (int)(pxValue / scale + 0.5f); } }
主活动：
public class NineGridActivity extends BaseActivity{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.view_nine_grid); } }
layout中的布局文件view_nine_grid：
<"1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <com.test.shiweiwei.myproject.selfish_view.NineGridView android:layout_width="match_parent" android:layout_height="match_parent"/> </LinearLayout>
总结
我写的只是最基本的九宫格滑动解密项目，实际用的九宫格解密比这个要复杂，有许多特效和其他更严谨的处理，事件的处理也不是这样草草了事，如果想写得漂亮，还得多花工夫。
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