Android 仿小米锁屏实现九宫格解锁功能(无需图片资源)

/** 
* @author SoBan 
* @create 2016/12/5 15:52. 
*/ 
public class MathUtil { 
public static double distance(double x1, double y1, double x2, double y2) { 
return Math.sqrt(Math.abs(x1 - x2) * Math.abs(x1 - x2) 
+ Math.abs(y1 - y2) * Math.abs(y1 - y2)); 
} 
public static double pointTotoDegrees(double x, double y) { 
return Math.toDegrees(Math.atan2(x, y)); 
} 
public static boolean checkInRound(float sx, float sy, float r, float x, 
float y) { 
return Math.sqrt((sx - x) * (sx - x) + (sy - y) * (sy - y)) < r; 
} 
}

/** 
* @author SoBan 
* @create 2016/12/5 15:51. 
*/ 
public class Point { 
public static int STATE_NORMAL = 0; 
public static int STATE_CHECK = 1; // 
public static int STATE_CHECK_ERROR = 2; // 
public float x; 
public float y; 
public int state = 0; 
public int index = 0;// 
public Point() { 
} 
public Point(float x, float y, int value) { 
this.x = x; 
this.y = y; 
index = value; 
} 
public int getColNum() { 
return (index - 1) % 3; 
} 
public int getRowNum() { 
return (index - 1) / 3; 
} 
} 

import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.Paint; 
import android.graphics.Paint.Style; 
import android.text.TextUtils; 
import android.util.AttributeSet; 
import android.util.Log; 
import android.view.MotionEvent; 
import android.view.View; 
import java.util.ArrayList; 
import java.util.List; 
import java.util.Timer; 
import java.util.TimerTask; 
/** 
* @author SoBan 
* @create 2016/12/5 15:49. 
*/ 
public class LocusPassWordView extends View { 
/** 
* 控件的宽高 
*/ 
private float width = 0; 
private float height = 0; 
private boolean isCache = false; //缓存pwdMaxLen个点 
private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 
private Point[][] mPoints = new Point[3][3]; 
private float dotRadius = 0; 
//选择>pwdMinLen的点 
private List<Point> sPoints = new ArrayList<Point>(); 
private boolean checking = false; 
private long CLEAR_TIME = 1000; 
private int pwdMaxLen = 9; 
private int pwdMinLen = 4; 
private boolean isTouch = true; 
private Paint linePaint; 
private Paint normalPaint; 
private Paint selectedPaint; 
private Paint errorPaint; 
private int normalDotColor = 0xff929292; 
private int selectedColor = 0xffC3C3C3; 
private int selectedLineColor = 0xffEDEDED; 
private int errorColor = 0xffF34B2A; 
private int errorLineColor = 0xffEEBFB6; 
public LocusPassWordView(Context context, AttributeSet attrs, int defStyle) { 
super(context, attrs, defStyle); 
} 
public LocusPassWordView(Context context, AttributeSet attrs) { 
super(context, attrs); 
} 
public LocusPassWordView(Context context) { 
super(context); 
} 
@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
int width = measureDimension(200, widthMeasureSpec); 
int height = measureDimension(200, heightMeasureSpec); 
if (width > height) { 
setMeasuredDimension(height, height); 
} else { 
setMeasuredDimension(width, width); 
} 
} 
public int measureDimension(int defaultSize, int measureSpec) { 
int result; 
int specMode = MeasureSpec.getMode(measureSpec); 
int specSize = MeasureSpec.getSize(measureSpec); 
if (specMode == MeasureSpec.EXACTLY) { 
result = specSize; 
} else { 
result = defaultSize; //UNSPECIFIED 
if (specMode == MeasureSpec.AT_MOST) { 
result = Math.min(result, specSize); 
} 
} 
return result; 
} 
@Override 
public void onDraw(Canvas canvas) { 
if (!isCache) { 
initCache(); 
} 
drawToCanvas(canvas); 
} 
private void drawToCanvas(Canvas canvas) { 
boolean inErrorState = false; 
float radiu = dotRadius / 16; //圆的半径 
//画点 
for (int i = 0; i < mPoints.length; i++) { 
for (int j = 0; j < mPoints[i].length; j++) { 
Point p = mPoints[i][j]; 
if (p.state == Point.STATE_CHECK) { 
selectedPaint.setColor(selectedColor); 
canvas.drawCircle(p.x, p.y, radiu, selectedPaint); 
} else if (p.state == Point.STATE_CHECK_ERROR) { 
inErrorState = true; 
errorPaint.setColor(errorColor); 
canvas.drawCircle(p.x, p.y, radiu, errorPaint); 
} else { 
normalPaint.setColor(normalDotColor); 
canvas.drawCircle(p.x, p.y, radiu, normalPaint); 
} 
} 
} 
if (inErrorState) { 
linePaint.setColor(errorLineColor); 
} else { 
linePaint.setColor(selectedLineColor); 
} 
//画线 
if (sPoints.size() > 0) { 
int tmpAlpha = mPaint.getAlpha(); 
Point tp = sPoints.get(0); 
for (int i = 1; i < sPoints.size(); i++) { 
Point p = sPoints.get(i); 
drawLine(tp, p, canvas, linePaint); 
tp = p; 
} 
if (this.movingNoPoint) { 
drawLine(tp, new Point(moveingX, moveingY, -1), canvas, linePaint); 
} 
mPaint.setAlpha(tmpAlpha); 
} 
} 
/** 
* 画线 
* @param start 
* @param end 
* @param canvas 
* @param paint 
*/ 
private void drawLine(Point start, Point end, Canvas canvas, Paint paint) { 
float radiu = dotRadius / 16; //圆的半径 
double d = MathUtil.distance(start.x, start.y, end.x, end.y); 
float rx = (float) ((end.x - start.x) * radiu / d); 
float ry = (float) ((end.y - start.y) * radiu / d); 
canvas.drawLine(start.x + rx, start.y + ry, end.x - rx, end.y - ry, paint); 
} 
/** 
* 缓存控件宽高跟点个位置 
*/ 
private void initCache() { 
width = this.getWidth(); 
height = this.getHeight(); 
float x = 0; 
float y = 0; 
if (width > height) { 
x = (width - height) / 2; 
width = height; 
} else { 
y = (height - width) / 2; 
height = width; 
} 
int leftPadding = 15; 
float dotPadding = width / 3 - leftPadding; 
float middleX = width / 2; 
float middleY = height / 2; 
mPoints[0][0] = new Point(x + middleX - dotPadding, y + middleY - dotPadding, 1); 
mPoints[0][1] = new Point(x + middleX, y + middleY - dotPadding, 2); 
mPoints[0][2] = new Point(x + middleX + dotPadding, y + middleY - dotPadding, 3); 
mPoints[1][0] = new Point(x + middleX - dotPadding, y + middleY, 4); 
mPoints[1][1] = new Point(x + middleX, y + middleY, 5); 
mPoints[1][2] = new Point(x + middleX + dotPadding, y + middleY, 6); 
mPoints[2][0] = new Point(x + middleX - dotPadding, y + middleY + dotPadding, 7); 
mPoints[2][1] = new Point(x + middleX, y + middleY + dotPadding, 8); 
mPoints[2][2] = new Point(x + middleX + dotPadding, y + middleY + dotPadding, 9); 
Log.d("jerome", "canvas width:" + width); 
dotRadius = width / 10; 
isCache = true; 
initPaints(); 
} 
private void initPaints() { 
linePaint = new Paint(); 
linePaint.setColor(selectedColor); 
linePaint.setStyle(Style.FILL); 
linePaint.setAntiAlias(true); 
linePaint.setStrokeWidth(dotRadius / 9); 
selectedPaint = new Paint(); 
selectedPaint.setStyle(Style.FILL); 
selectedPaint.setAntiAlias(true); 
selectedPaint.setStrokeWidth(dotRadius / 6); 
errorPaint = new Paint(); 
errorPaint.setStyle(Style.FILL); 
errorPaint.setAntiAlias(true); 
errorPaint.setStrokeWidth(dotRadius / 6); 
normalPaint = new Paint(); 
normalPaint.setStyle(Style.FILL); 
normalPaint.setAntiAlias(true); 
normalPaint.setStrokeWidth(dotRadius / 9); 
} 
/** 
* 检查 
* 
* @param x 
* @param y 
* @return 
*/ 
private Point checkSelectPoint(float x, float y) { 
for (int i = 0; i < mPoints.length; i++) { 
for (int j = 0; j < mPoints[i].length; j++) { 
Point p = mPoints[i][j]; 
if (MathUtil.checkInRound(p.x, p.y, dotRadius, (int) x, (int) y)) { 
return p; 
} 
} 
} 
return null; 
} 
/** 
* 重置 
*/ 
private void reset() { 
for (Point p : sPoints) { 
p.state = Point.STATE_NORMAL; 
} 
sPoints.clear(); 
this.enableTouch(); 
} 
/** 
* 判断点是否有交叉 返回 0,新点 ,1 与上一点重叠 2,与非最后一点重叠 
* 
* @param p 
* @return 
*/ 
private int crossPoint(Point p) { 
// 重叠的不最后一个则 reset 
if (sPoints.contains(p)) { 
if (sPoints.size() > 2) { 
// 与非最后一点重叠 
if (sPoints.get(sPoints.size() - 1).index != p.index) { 
return 2; 
} 
} 
return 1; // 与最后一点重叠 
} else { 
return 0; // 新点 
} 
} 
/** 
* 添加一个点 
* 
* @param point 
*/ 
private void addPoint(Point point) { 
if (sPoints.size() > 0) { 
Point lastPoint = sPoints.get(sPoints.size() - 1); 
int dx = Math.abs(lastPoint.getColNum() - point.getColNum()); 
int dy = Math.abs(lastPoint.getRowNum() - point.getRowNum()); 
if ((dx > 1 || dy > 1) && (dx == 0 || dy == 0 || dx == dy)) { 
// if ((dx > 1 || dy > 1) && (dx != 2 * dy) && (dy != 2 * dx)) { 
int middleIndex = (point.index + lastPoint.index) / 2 - 1; 
Point middlePoint = mPoints[middleIndex / 3][middleIndex % 3]; 
if (middlePoint.state != Point.STATE_CHECK) { 
middlePoint.state = Point.STATE_CHECK; 
sPoints.add(middlePoint); 
} 
} 
} 
this.sPoints.add(point); 
} 
/** 
* 转换为String 
*/ 
private String toPointString() { 
if (sPoints.size() >= pwdMinLen && sPoints.size() <= pwdMaxLen) { 
StringBuffer sf = new StringBuffer(); 
for (Point p : sPoints) { 
sf.append(p.index); 
} 
return sf.toString(); 
} else { 
return ""; 
} 
} 
boolean movingNoPoint = false; 
float moveingX, moveingY; 
@Override 
public boolean onTouchEvent(MotionEvent event) { 
// 不可操作 
if (!isTouch) { 
return false; 
} 
movingNoPoint = false; 
float ex = event.getX(); 
float ey = event.getY(); 
boolean isFinish = false; 
boolean redraw = false; 
Point p = null; 
switch (event.getAction()) { 
case MotionEvent.ACTION_DOWN: //点下 
// 如果正在清除密码,则取消 
if (task != null) { 
task.cancel(); 
task = null; 
Log.d("task", "touch cancel()"); 
} 
// 删除之前的点 
reset(); 
p = checkSelectPoint(ex, ey); 
if (p != null) { 
checking = true; 
} 
mCompleteListener.onPrompt("完成后松开手指"); 
break; 
case MotionEvent.ACTION_MOVE:// 移动 
if (checking) { 
p = checkSelectPoint(ex, ey); 
if (p == null) { 
movingNoPoint = true; 
moveingX = ex; 
moveingY = ey; 
} 
} 
break; 
case MotionEvent.ACTION_UP:// 提起 
p = checkSelectPoint(ex, ey); 
checking = false; 
isFinish = true; 
break; 
} 
if (!isFinish && checking && p != null) { 
int rk = crossPoint(p); 
if (rk == 2) {// 与非最后一重叠 
// reset(); 
// checking = false; 
movingNoPoint = true; 
moveingX = ex; 
moveingY = ey; 
redraw = true; 
} else if (rk == 0) {// 一个新点 
p.state = Point.STATE_CHECK; 
addPoint(p); 
redraw = true; 
} 
// rk == 1 
} 
// 是否重画 
if (redraw) { 
} 
if (isFinish) { 
if (this.sPoints.size() == 1) { 
this.reset(); 
isFirstPwdEmpty(); 
} else if (sPoints.size() > 0 && sPoints.size() < pwdMinLen) { 
error(); 
clearPassword(); 
isFirstPwdEmpty(); 
} else if (mCompleteListener != null) { 
if (this.sPoints.size() >= pwdMinLen) { 
this.disableTouch(); 
isPwdEqual(); 
} 
} 
} 
this.postInvalidate(); 
return true; 
} 
private void isFirstPwdEmpty() { 
if (TextUtils.isEmpty(firstPassword)) { 
mCompleteListener.onPrompt("至少需连接4个点，请重试。"); 
} else { 
mCompleteListener.onPrompt("请重试"); 
} 
} 
private void isPwdEqual() { 
if (TextUtils.isEmpty(firstPassword)) { 
mCompleteListener.onPrompt("再次绘制图案进行确认"); 
mCompleteListener.onComplete(toPointString()); 
} else { 
if (firstPassword.equals(toPointString())) { 
mCompleteListener.onPrompt("您的新解锁图案"); 
mCompleteListener.onComplete(toPointString()); 
} else { 
mCompleteListener.onPrompt("请重试"); 
error(); 
clearPassword(); 
} 
} 
} 
/** 
* 设置已经选中的为错误 
*/ 
private void error() { 
for (Point p : sPoints) { 
p.state = Point.STATE_CHECK_ERROR; 
} 
} 
/** 
* 设置为输入错误 
*/ 
public void markError() { 
markError(CLEAR_TIME); 
} 
/** 
* 设置为输入错误 
*/ 
public void markError(final long time) { 
for (Point p : sPoints) { 
p.state = Point.STATE_CHECK_ERROR; 
} 
this.clearPassword(time); 
} 
/** 
* 设置为可操作 
*/ 
public void enableTouch() { 
isTouch = true; 
} 
/** 
* 设置为不可操作 
*/ 
public void disableTouch() { 
isTouch = false; 
} 
private Timer timer = new Timer(); 
private TimerTask task = null; 
/** 
* 清除密码 
*/ 
public void clearPassword() { 
clearPassword(CLEAR_TIME); 
} 
/** 
* 清除密码 
*/ 
public void clearPassword(final long time) { 
if (time > 1) { 
if (task != null) { 
task.cancel(); 
Log.d("task", "clearPassword cancel()"); 
} 
postInvalidate(); 
task = new TimerTask() { 
public void run() { 
reset(); 
postInvalidate(); 
} 
}; 
Log.d("task", "clearPassword schedule(" + time + ")"); 
timer.schedule(task, time); 
} else { 
reset(); 
postInvalidate(); 
} 
} 
private String firstPassword; 
public String getFirstPassword() { 
return firstPassword; 
} 
public void setFirstPassword(String firstPassword) { 
this.firstPassword = firstPassword; 
} 
private OnCompleteListener mCompleteListener; 
public void setOnCompleteListener(OnCompleteListener mCompleteListener) { 
this.mCompleteListener = mCompleteListener; 
} 
public interface OnCompleteListener { 
void onComplete(String password); //密码 
void onPrompt(String prompt); //提示信息 
} 
}

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 
import android.widget.Toast; 
import soban.ninelockscreen.R; 
public class MainActivity extends Activity implements View.OnClickListener, LocusPassWordView.OnCompleteListener { 
private String TAG = Main2Activity.class.getName(); 
private TextView mExplainTv; 
private Button mRepaintBtn; 
private Button mConfirmBtn; 
private LocusPassWordView mPwdView; 
private String firstPassword; 
private String againPassword; 
private boolean isFirst; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
initViews(); 
} 
private void initViews() { 
mExplainTv = (TextView) findViewById(R.id.tv_explain); 
mRepaintBtn = (Button) findViewById(R.id.btn_repaint); 
mConfirmBtn = (Button) findViewById(R.id.btn_confirm); 
mPwdView = (LocusPassWordView) findViewById(R.id.mPassWordView2); 
mRepaintBtn.setOnClickListener(this); 
mConfirmBtn.setOnClickListener(this); 
mPwdView.setOnCompleteListener(this); 
initChoose(); 
} 
@Override 
public void onClick(View view) { 
switch (view.getId()) { 
case R.id.btn_repaint: 
repaint(); 
break; 
case R.id.btn_confirm: 
confirm(); 
break; 
} 
} 
private void repaint() { 
mPwdView.clearPassword(0); 
initChoose(); 
} 
private void confirm() { 
Toast.makeText(MainActivity.this, "你设置的密码：" + againPassword, Toast.LENGTH_SHORT).show(); 
} 
@Override 
public void onComplete(String password) { 
if (isFirst) { 
firstChoose(password); 
} else { 
secondChoose(password); 
} 
Log.e(TAG, "onComplete -> " + password); 
} 
@Override 
public void onPrompt(String prompt) { 
mExplainTv.setText(prompt); 
} 
private void initChoose() { 
isFirst = true; 
firstPassword = ""; 
againPassword = ""; 
mPwdView.setFirstPassword(""); 
mRepaintBtn.setVisibility(View.GONE); 
mConfirmBtn.setVisibility(View.GONE); 
} 
private void firstChoose(String password) { 
isFirst = false; 
firstPassword = password; 
mPwdView.setFirstPassword(password); 
mPwdView.clearPassword(0); 
mRepaintBtn.setEnabled(true); 
mConfirmBtn.setEnabled(false); 
mRepaintBtn.setVisibility(View.VISIBLE); 
mConfirmBtn.setVisibility(View.VISIBLE); 
} 
private void secondChoose(String password) { 
isFirst = true; 
againPassword = password; 
mRepaintBtn.setEnabled(true); 
mConfirmBtn.setEnabled(true); 
} 
}

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:gravity="center_horizontal" 
android:orientation="vertical"> 
<LinearLayout 
android:id="@+id/bottomLayout" 
android:layout_width="match_parent" 
android:layout_height="50dip" 
android:layout_alignParentBottom="true" 
android:orientation="horizontal"> 
<Button 
android:id="@+id/btn_repaint" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:layout_weight="1" 
android:text="重绘" /> 
<Button 
android:id="@+id/btn_confirm" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:layout_weight="1" 
android:text="确认" /> 
</LinearLayout> 
<soban.ninelockscreen.demo.LocusPassWordView 
android:id="@+id/mPassWordView2" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:layout_above="@id/bottomLayout" /> 
<TextView 
android:id="@+id/tv_explain" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:layout_above="@id/mPassWordView2" 
android:layout_alignParentTop="true" 
android:background="@color/colorPrimary" 
android:gravity="center" 
android:text="绘制解锁图案,请至少连接4个点" 
android:textColor="#FFFFFF" /> 
</RelativeLayout>