现在好多应用都可以设置手势锁，Android本身也有提供手势图案锁屏。作为Android菜鸟的我，，也忍不住想自己动手实现一下。
下面是应用效果图:
思路:
1.自定义一个View，重写onDraw方法，利用canvas绘制图形。
2.实现onTouch事件
* Down Move Down 每次判断是否有在手指的位置相应处理。
3.直接在布局文件里面 引用View就可以了。
注意:
我在实现的过程中遇到一个问题，导致应用奔溃，日志信息也看不懂。最后是在stackoverflow上找到解决方法的。自定义的View一定要实现 两个参数的构造函数(即SudokuView(Context context, AttributeSet attrs))
下面直接上代码
Cell 类(存储圆点的信息)
package com.example.mummyding.sudokulock;/** * Created by mummyding on 15-7-17. */public class Cell {private int x;private int y;private boolean isSelected;public boolean isSelected() {return isSelected;}public void setIsSelected(boolean isSelected) {this.isSelected = isSelected;}public int getX() {return x;}public void setX(int x) {this.x = x;}public int getY() {return y;}public void setY(int y) {this.y = y;}}自定义View
package com.example.mummyding.sudokulock;import android.app.Notification;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.view.WindowManager;import android.widget.Toast;import java.lang.reflect.Type;/** * Created by mummyding on 15-7-17. */public class SudokuView extends View {private static final int COUNT = 3;Cell [] cell;int [] selectedCell;int RADIUS ,OFFSET;int ScreenWidth,ScreenHeight;int startX,startY,selectedCount,lastX,lastY;boolean drawFinish ;Paint mPaint ;public SudokuView(Context context, AttributeSet attrs) {super(context, attrs);init(context);}private void initCell(){//初始化各点for(int i = 0 ; i < COUNT ; i++ )for (int j = 0 ; j < COUNT ; j++) {cell[i * COUNT + j].setIsSelected(false);cell[i * COUNT + j].setX(startX + OFFSET * j – RADIUS/2);cell[i * COUNT + j].setY(startY + OFFSET * i – RADIUS/2);}}private void init(Context context){cell = new Cell[COUNT * COUNT];selectedCell = new int[COUNT*COUNT];mPaint = new Paint();//获取屏幕的宽度和高度WindowManager manager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);DisplayMetrics dm=new DisplayMetrics();manager.getDefaultDisplay().getMetrics(dm);ScreenWidth = dm.widthPixels;ScreenHeight = dm.heightPixels;this.setMinimumWidth(ScreenWidth);this.setMinimumHeight(ScreenHeight);drawFinish = false; //是否绘制完成selectedCount = 0; //已经选中的点个数RADIUS = ScreenWidth / 12; //半径OFFSET = ScreenWidth / 4 ; //点之间的间距startX = OFFSET; //起始点横坐标startY = (ScreenHeight – OFFSET * 2) / 2; //起始点纵坐标for(int i = 0 ; i < COUNT*COUNT ; i++){cell[i] = new Cell();}initCell();}int inWhichCircle(int x, int y){for(int i = 0 ; i < COUNT*COUNT ; i++){if(cell[i].isSelected() == false){if((Math.abs(x – cell[i].getX())<RADIUS) && Math.abs(y – cell[i].getY()) < RADIUS){return i;}}}return -1;}void drawCell(Canvas canvas){for(int i = 0 ; i < COUNT*COUNT ; i++){//选择画笔&&画圆if(cell[i].isSelected()){mPaint.setColor(Color.GREEN);mPaint.setStrokeWidth(10);//画圆canvas.drawCircle(cell[i].getX(),cell[i].getY(),RADIUS,mPaint);mPaint.setStrokeWidth(20);//画点canvas.drawPoint(cell[i].getX(),cell[i].getY(),mPaint);} else {mPaint.setColor(Color.WHITE);mPaint.setStrokeWidth(5);//画圆canvas.drawCircle(cell[i].getX(),cell[i].getY(),RADIUS,mPaint);//画点canvas.drawPoint(cell[i].getX(),cell[i].getY(),mPaint);}}}void drawLine(Canvas canvas) {mPaint.setColor(Color.GREEN);mPaint.setStrokeWidth(5);for(int i = 1 ; i < selectedCount ; i++){Cell lastCell = cell[selectedCell[i-1]],thisCell = cell[selectedCell[i]];canvas.drawLine(lastCell.getX(), lastCell.getY(), thisCell.getX(), thisCell.getY(), mPaint);}if(selectedCount !=0 &&(lastX !=0 || lastY != 0)){canvas.drawLine(cell[selectedCell[selectedCount – 1]].getX(), cell[selectedCell[selectedCount – 1]].getY(), lastX, lastY, mPaint);}}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);mPaint = new Paint();mPaint.setStrokeWidth(5);;mPaint.setAntiAlias(true);mPaint.setColor(Color.GRAY);mPaint.setStyle(Paint.Style.FILL);mPaint.setStyle(Paint.Style.STROKE);drawCell(canvas);drawLine(canvas);}@Overridepublic boolean onTouchEvent(MotionEvent event) {int tmpIndex;switch (event.getAction()){case MotionEvent.ACTION_DOWN:drawFinish = false;if((tmpIndex = inWhichCircle((int)event.getX(),(int)event.getY())) != -1){cell[tmpIndex].setIsSelected(true);selectedCell[selectedCount++] = tmpIndex;this.postInvalidate();}break;case MotionEvent.ACTION_MOVE:if(drawFinish == false){if((tmpIndex = inWhichCircle((int)event.getX(),(int)event.getY())) != -1){cell[tmpIndex].setIsSelected(true);selectedCell[selectedCount++] = tmpIndex;}}lastX = (int) event.getX();lastY = (int) event.getY();this.postInvalidate();break;case MotionEvent.ACTION_UP:drawFinish = true;lastX = lastY = 0;selectedCount = 0;initCell();this.postInvalidate();break;}return true;}}布局布局[XML]
朋友，旭日正在升起，每一份付出，
