手势密码

package com.xiaoyu.shoushi_pass_exercise;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

/**
 * 1.类的用途:
 * 2.作者:段玉
 * 3.时间:2017/2/8 07
 * 4.邮箱:[email protected]
 */
public class Shou_Shi extends View {

    //画笔颜色
    public final static int Before_Color = Color.parseColor("#FAEB76");
    public final static int After_Color = Color.parseColor("#000000");

    //画圆集合
    List<Circle> circleList = new ArrayList<>();
    //画线的集合
    List<Circle> lineList = new ArrayList<Circle>();

   //获取宽高
    private int width;
    private int height;
    //半径
    private int radio;
    private Paint paint;

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

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

    public Shou_Shi(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        width = getWidth();
        height = getHeight();

        radio = width / 10;

        addlist();
        drawCircle(canvas);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()){
            case MotionEvent.ACTION_DOWN:
            {

            }
                break;
            case MotionEvent.ACTION_MOVE:
            {
                int x = (int) event.getX();
                int y = (int) event.getY();
                Log.d("段玉",x+"---"+y);
                //坐标转换
                for (int i = 0; i < circleList.size(); i++) {
                    int xx = (int) Math.pow((x - circleList.get(i).x), 2);
                    int yy = (int) Math.pow((y - circleList.get(i).y),2);

                    int num = xx + yy;

                    //根据勾股定力判断
                    if (num <= Math.pow(radio,2)){
                        //重新设置画笔颜色
                        circleList.get(i).color = After_Color;
                        //设置为选中状态
                        circleList.get(i).isSelect = true;

                        //判断是否存在,避免加重复
                        Boolean isflag = false;

                        for (int j = 0; j < lineList.size(); j++) {
                            //通过数字判断存在不存在
                            if (circleList.get(i).number == lineList.get(j).number){
                                isflag = true;
                            }
                        }

                        //否则就加入
                        if (isflag == false){
                            Circle circle = new Circle();
                            circle.x = circleList.get(i).x;
                            circle.y = circleList.get(i).y;
                            circle.color = circleList.get(i).color;
                            circle.number = circleList.get(i).number;
                            lineList.add(circle);
                        }

                        //同时刷新ui
                        postInvalidate();

                    }

                }

            }
                break;
            case MotionEvent.ACTION_UP:
            {
                String passWord = "";

                for (int i = 0; i < lineList.size(); i++) {
                    passWord += lineList.get(i).number+"";
                }
                Toast.makeText(getContext(),"当前密码是"+passWord, Toast.LENGTH_SHORT).show();

                //清理屏幕
                for (int i = 0; i < circleList.size(); i++) {
                    circleList.get(i).color = Before_Color;
                    circleList.get(i).isSelect = false;
                }

                //清空集合
                lineList.clear();

                //同时刷新ui
                postInvalidate();
            }
                break;
        }



        return true;
    }

    private void drawCircle(Canvas canvas) {
        //实例化画笔
        paint = new Paint();
        //设置画笔抗锯齿
        paint.setAntiAlias(true);
        //设置画笔宽度
        paint.setStrokeWidth(3);
        //设置空心圆
        paint.setStyle(Paint.Style.STROKE);
        for (int i = 0; i < circleList.size(); i++) {
            //设置画笔颜色
            paint.setColor(circleList.get(i).color);
            //画圆
            canvas.drawCircle(circleList.get(i).x,circleList.get(i).y,circleList.get(i).radio,paint);
        }

        boolean isFirst = false;
        int startX = 0;
        int startY = 0;

        //画线的方法
        for (int i = 0; i < lineList.size(); i++) {
            if (isFirst == false){
                isFirst = true;
                startX = lineList.get(i).x;
                startY = lineList.get(i).y;
            }else{
                paint.setColor(lineList.get(i).color);
                //画线
                canvas.drawLine(startX,startY,lineList.get(i).x,lineList.get(i).y,paint);
                startX = lineList.get(i).x;
                startY = lineList.get(i).y;
            }
        }


    }

    private void addlist() {
        for (int i = 1; i <= 9; i++) {
            //实例化对象
            Circle circle = new Circle();
            if (i <= 3){
                circle.y = height/2 - radio*3;
            }else if (i > 3 && i <= 6){
                circle.y = height / 2;
            }else{
                circle.y = height/2 +radio*3;
            }
            if (i == 1 || i == 4 || i == 7){
                circle.x = radio * 2;
            }else if (i == 2 || i == 5 || i == 8){
                circle.x = radio * 5;
            }else{
                circle.x = radio * 8;
            }

            circle.radio = radio;
            circle.isSelect = false;
            circle.color = Before_Color;
            circle.number = i;
            circleList.add(circle);
        }
    }
}

//一下就是简单的xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#00ff00"
    tools:context="com.xiaoyu.shoushi_pass_exercise.MainActivity">

    <com.baway.shoushi_pass_exercise.Shou_Shi
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</RelativeLayout>