Android自定义九宫格图案解锁

package com.jackie.lockpattern;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.View;

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

/**
* Created by Jackie on 2015/12/24.
* 图案解锁
*/
public class LockPatternView extends View {
/**
* 圆的画笔
*/
private Paint mCirclePaint;
/**
* 线的画笔
*/
private Paint mLinePaint;
/**
* 圆心数组
*/
private PointView[][] mPointViewArray = new PointView[3][3];
/**
* 保存选中点的集合
*/
private List<PointView> mSelectedPointViewList;

/**
* 解锁图案的边长
*/
private int mPatternWidth;

/**
* 图案监听器
*/
private OnPatternChangeListener mOnPatternChangeListener;

/**
* 半径
*/
private float mRadius;

/**
* 每个圆圈的下标
*/
private int mIndex = 1;

/**
* 第一个点是否选中
*/
private boolean mIsSelected;
/**
* 是否绘制结束
*/
private boolean mIsFinished;

/**
* 正在滑动并且没有任何点选中
*/
private boolean mIsMovingWithoutCircle = false;

private float mCurrentX, mCurrentY;

/**
* 正常状态的颜色
*/
private static final int NORMAL_COLOR = 0xFF70DBDB;
/**
* 选中状态的颜色
*/
private static final int SELECTED_COLOR = 0xFF979797;

public LockPatternView(Context context) {
this(context, null);
}

public LockPatternView(Context context, AttributeSet attrs) {
super(context, attrs);

mCirclePaint = new Paint();
mCirclePaint.setAntiAlias(true);
mCirclePaint.setDither(true);
mCirclePaint.setColor(NORMAL_COLOR);
mCirclePaint.setStyle(Paint.Style.FILL);

mLinePaint = new Paint();
mLinePaint.setAntiAlias(true);
mLinePaint.setDither(true);
mLinePaint.setStrokeWidth(20);
mLinePaint.setColor(SELECTED_COLOR);
mLinePaint.setStyle(Paint.Style.STROKE);

mRadius = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, getResources().getDisplayMetrics());

mSelectedPointViewList = new ArrayList<>();
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);

//取屏幕长和宽中的较小值作为图案的边长
mPatternWidth = Math.min(getMeasuredWidth(), getMeasuredHeight());
setMeasuredDimension(mPatternWidth, mPatternWidth);
}

@Override
protected void onDraw(Canvas canvas) {
//画圆
drawCircle(canvas);

//将选中的圆重新绘制一遍，将选中的点和未选中的点区别开来
for (PointView pointView : mSelectedPointViewList) {
mCirclePaint.setColor(SELECTED_COLOR);
canvas.drawCircle(pointView.x, pointView.y, mRadius, mCirclePaint);
mCirclePaint.setColor(NORMAL_COLOR);  //每重新绘制一个,将画笔的颜色重置,保证不会影响其他圆的绘制
}

//点与点画线
if (mSelectedPointViewList.size() > 0) {
Point pointViewA = mSelectedPointViewList.get(0);  //第一个选中的点为A点
for (int i = 0; i < mSelectedPointViewList.size(); i++) {
Point pointViewB = mSelectedPointViewList.get(i);  //其他依次遍历出来的点为B点
drawLine(canvas, pointViewA, pointViewB);
pointViewA = pointViewB;
}

//点与鼠标当前位置绘制轨迹
if (mIsMovingWithoutCircle & !mIsFinished) {
drawLine(canvas, pointViewA, new PointView((int)mCurrentX, (int)mCurrentY));
}
}

super.onDraw(canvas);
}

/**
* 画圆
* @param canvas  画布
*/
private void drawCircle(Canvas canvas) {
//初始化点的位置
for (int i = 0; i < mPointViewArray.length; i++) {
for (int j = 0; j < mPointViewArray.length; j++) {
//圆心的坐标
int cx = mPatternWidth / 4 * (j + 1);
int cy = mPatternWidth / 4 * (i + 1);

//将圆心放在一个点数组中
PointView pointView = new PointView(cx, cy);
pointView.setIndex(mIndex);
mPointViewArray[i][j] = pointView;
canvas.drawCircle(cx, cy, mRadius, mCirclePaint);
mIndex++;
}
}

mIndex = 1;
}

/**
* 画线
* @param canvas  画布
* @param pointA  第一个点
* @param pointB  第二个点
*/
private void drawLine(Canvas canvas, Point pointA, Point pointB) {
canvas.drawLine(pointA.x, pointA.y, pointB.x, pointB.y, mLinePaint);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
mCurrentX = event.getX();
mCurrentY = event.getY();
PointView selectedPointView = null;

switch(event.getAction()) {
case MotionEvent.ACTION_DOWN:
//重新绘制
if (mOnPatternChangeListener != null) {
mOnPatternChangeListener.onPatternStarted(true);
}

mSelectedPointViewList.clear();
mIsFinished = false;

selectedPointView = checkSelectPoint();

if (selectedPointView != null) {
//第一次按下的位置在圆内，被选中
mIsSelected = true;
}
break;
case MotionEvent.ACTION_MOVE:
if (mIsSelected) {
selectedPointView = checkSelectPoint();
}

if (selectedPointView == null) {
mIsMovingWithoutCircle = true;
}
break;
case MotionEvent.ACTION_UP:
mIsFinished = true;
mIsSelected = false;
break;
}

//将选中的点收集起来
if (!mIsFinished && mIsSelected && selectedPointView != null) {
if (!mSelectedPointViewList.contains(selectedPointView)) {
mSelectedPointViewList.add(selectedPointView);
}
}

if (mIsFinished) {
if (mSelectedPointViewList.size() == 1) {
mSelectedPointViewList.clear();
} else if (mSelectedPointViewList.size() < 5 && mSelectedPointViewList.size() > 0) {
//绘制错误
if (mOnPatternChangeListener != null) {
mOnPatternChangeListener.onPatternChange(null);
}
} else {
//绘制成功
String patternPassword = "";
if (mOnPatternChangeListener != null) {
for (PointView pointView : mSelectedPointViewList) {
patternPassword += pointView.getIndex();
}

if (!TextUtils.isEmpty(patternPassword)) {
mOnPatternChangeListener.onPatternChange(patternPassword);
}
}
}
}

invalidate();
return true;
}

/**
* 判断当前按下的位置是否在圆心数组中
* @return 返回选中的点
*/
private PointView checkSelectPoint() {
for (int i = 0; i < mPointViewArray.length; i++) {
for (int j = 0; j < mPointViewArray.length; j++) {
PointView pointView = mPointViewArray[i][j];
if (isWithinCircle(mCurrentX, mCurrentY, pointView.x, pointView.y, mRadius)) {
return pointView;
}
}
}

return null;
}

/**
* 判断点是否在圆内
* @param x      点X轴坐标
* @param y      点Y轴坐标
* @param cx     圆心X坐标
* @param cy     圆心Y坐标
* @param radius 半径
* @return       true表示在圆内，false表示在圆外
*/
private boolean isWithinCircle(float x, float y, float cx, float cy, float radius) {
//如果点和圆心的距离小于半径，则证明点在圆内
if (Math.sqrt(Math.pow(x - cx, 2) + Math.pow(y- cy, 2)) <= radius) {
return true;
}

return false;
}

/**
* 设置图案监听器
*/
public void setOnPatternChangeListener(OnPatternChangeListener onPatternChangeListener) {
if (onPatternChangeListener != null) {
this.mOnPatternChangeListener = onPatternChangeListener;
}
}

/**
* 图案监听器
*/
public interface OnPatternChangeListener {
/**
* 图案改变
* @param patternPassword 图案密码
*/
void onPatternChange(String patternPassword);

/**
* 图案是否重新绘制
* @param isStarted 重新绘制
*/
void onPatternStarted(boolean isStarted);
}
}

package com.jackie.lockpattern;

import android.graphics.Point;

/**
* Created by Jackie on 2015/12/25.
* 自定义点对象
*/
public class PointView extends Point {
//用于转化密码的下标
public int index;

public PointView(int x, int y) {
super(x, y);
}

public int getIndex() {
return index;
}

public void setIndex(int index) {
this.index = index;
}
}

package com.jackie.lockpattern;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends Activity implements LockPatternView.OnPatternChangeListener {
private TextView mLockPatternHint;
private LockPatternView mLockPatternView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mLockPatternHint = (TextView) findViewById(R.id.lock_pattern_hint);
mLockPatternView = (LockPatternView) findViewById(R.id.lock_pattern_view);
mLockPatternView.setOnPatternChangeListener(this);

}

@Override
public void onPatternChange(String patternPassword) {
if (patternPassword == null) {
mLockPatternHint.setText("至少5个点");
} else {
mLockPatternHint.setText(patternPassword);
}
}

@Override
public void onPatternStarted(boolean isStarted) {
if (isStarted) {
mLockPatternHint.setText("请绘制图案");
}
}
}