有时候为了程序的安全性,我们经常要采取一些安全措施,就像我们常用的支付宝那样,隔一定的时间再回到应用程序时会让用户利用手势去解锁应用程序,最近由于项目需求,也要求做这样一个功能,当用户切出本应用程序15分钟后回来,让用户手势解锁,整个需求的难点就在如何实现这个手势锁,开始一点头绪也没有,没有一点思路去实现这个手势解锁功能,在google了一番后看了一篇非常好的博客后,按照博主的思路的确是可以实现一个十分不错的手势锁View,也参考了下那位大神的代码,下面是我根据他的思路和代码片段实现的一个自定义手势解锁 View,先看效果图.
这是自定义View的初始效果图:
以下是绘制手势时的效果图:
下面是实现的demo代码:
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package com.example.gesturelock; import java.util.ArrayList; import java.util.List; import java.util.Timer; import java.util.TimerTask; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import com.example.gesturelock.GestureLockView.OnGestureFinishListener; public class MyGestureLockView extends View { /** * 不同状态的画笔 */ private Paint paintNormal; private Paint paintOnTouch; private Paint paintInnerCycle; private Paint paintLines; private Paint paintKeyError; private MyCycle[] cycles; private Path linePath = new Path(); private List<Integer> linedCycles = new ArrayList<Integer>(); private OnGestureFinishListener onGestureFinishListener; private String key; private int eventX, eventY; private boolean canContinue = true; private boolean result; private Timer timer; /** * 不同状态下的色值 */ private int OUT_CYCLE_NORMAL = Color.rgb(108, 119, 138); // ������Բ��ɫ private int OUT_CYCLE_ONTOUCH = Color.rgb(025, 066, 103); // ѡ����Բ��ɫ private int INNER_CYCLE_ONTOUCH = Color.rgb(002, 210, 255); // ѡ����Բ��ɫ private int LINE_COLOR = Color.argb(127, 002, 210, 255); // ��������ɫ private int ERROR_COLOR = Color.argb(127, 255, 000, 000); public void setOnGestureFinishListener( OnGestureFinishListener onGestureFinishListener) { this.onGestureFinishListener = onGestureFinishListener; } public void setKey(String key) { this.key = key; } public MyGestureLockView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(); } public MyGestureLockView(Context context, AttributeSet attrs) { super(context, attrs); init(); } public MyGestureLockView(Context context) { super(context); init(); } private void init() { paintNormal = new Paint(); paintNormal.setAntiAlias(true); paintNormal.setStrokeWidth(3); paintNormal.setStyle(Paint.Style.STROKE); paintOnTouch = new Paint(); paintOnTouch.setAntiAlias(true); paintOnTouch.setStrokeWidth(3); paintOnTouch.setStyle(Paint.Style.STROKE); paintInnerCycle = new Paint(); paintInnerCycle.setAntiAlias(true); paintInnerCycle.setStyle(Paint.Style.FILL); paintLines = new Paint(); paintLines.setAntiAlias(true); paintLines.setStyle(Paint.Style.STROKE); paintLines.setStrokeWidth(6); paintKeyError = new Paint(); paintKeyError.setAntiAlias(true); paintKeyError.setStyle(Paint.Style.STROKE); paintKeyError.setStrokeWidth(3); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // TODO Auto-generated method stub super.onMeasure(widthMeasureSpec, heightMeasureSpec); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { // TODO Auto-generated method stub super.onLayout(changed, left, top, right, bottom); int perSize = 0; if (cycles == null && (perSize = getWidth() / 6) > 0) { cycles = new MyCycle[9]; for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) { MyCycle cycle = new MyCycle(); cycle.setNum(i * 3 + j); cycle.setOx(perSize * (j * 2 + 1)); cycle.setOy(perSize * (i * 2 + 1)); cycle.setR(perSize * 0.5f); cycles[i * 3 + j] = cycle; } } } } /** * 绘制所需要绘制的内容 */ @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); for (int i = 0; i < cycles.length; i++) { if (!canContinue && !result) { paintOnTouch.setColor(ERROR_COLOR); paintInnerCycle.setColor(ERROR_COLOR); paintLines.setColor(ERROR_COLOR); } else if (cycles[i].isOnTouch()) { paintOnTouch.setColor(OUT_CYCLE_ONTOUCH); paintInnerCycle.setColor(INNER_CYCLE_ONTOUCH); paintLines.setColor(LINE_COLOR); } else { paintNormal.setColor(OUT_CYCLE_NORMAL); paintInnerCycle.setColor(INNER_CYCLE_ONTOUCH); paintLines.setColor(LINE_COLOR); } if (cycles[i].isOnTouch()) { canvas.drawCircle(cycles[i].getOx(), cycles[i].getOy(), cycles[i].getR(), paintOnTouch); drawInnerBuleCycle(cycles[i], canvas); } else { canvas.drawCircle(cycles[i].getOx(), cycles[i].getOy(), cycles[i].getR(), paintNormal); } } drawLine(canvas); } /** * 绘制大圆里的小圆 * * @param canvas */ private void drawInnerBuleCycle(MyCycle cycle, Canvas canvas) { canvas.drawCircle(cycle.getOx(), cycle.getOy(), cycle.getR() / 3, paintInnerCycle); } private void drawLine(Canvas canvas) { linePath.reset(); if (linedCycles.size() > 0) { for (int i = 0; i < linedCycles.size(); i++) { int index = linedCycles.get(i); if (i == 0) { // 设置为整条路径的起点 linePath.moveTo(cycles[index].getOx(), cycles[i].getOy()); } else { linePath.lineTo(cycles[i].getOx(), cycles[i].getOy()); } } linePath.lineTo(eventX, eventY); canvas.drawPath(linePath, paintLines); } } /** * 根据手择时触摸点的不同,修改对应的状态值 */ @Override public boolean onTouchEvent(MotionEvent event) { if (canContinue) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: case MotionEvent.ACTION_MOVE: eventX = (int) event.getX(); eventY = (int) event.getY(); for (int i = 0; i < cycles.length; i++) { if (cycles[i].isPointIn(eventX, eventY)) { cycles[i].setOnTouch(true); if (!linedCycles.contains(cycles[i].getNum())) { linedCycles.add(cycles[i].getNum()); } } } break; case MotionEvent.ACTION_UP: canContinue = false; StringBuffer sb = new StringBuffer(); for (int i = 0; i < linedCycles.size(); i++) { sb.append(linedCycles.get(i)); } result = key.equals(sb.toString()); if (onGestureFinishListener != null) { onGestureFinishListener.OnGestureFinish(result); } timer = new Timer(); timer.schedule(new TimerTask() { @Override public void run() { // 回到初始状态 eventX = eventY = 0; for (int i = 0; i < cycles.length; i++) { cycles[i].setOnTouch(false); } linedCycles.clear(); linePath.reset(); canContinue = true; postInvalidate(); } }, 1000); break; } } invalidate(); return true; } } |
自定义圆类:
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package com.example.gesturelock; public class MyCycle { private int ox; // Բ�ĺ����� private int oy; // Բ�������� private float r; // �뾶���� private Integer num; // ������ֵ private boolean onTouch; // false=δѡ�� public int getOx() { return ox; } public void setOx(int ox) { this.ox = ox; } public int getOy() { return oy; } public void setOy(int oy) { this.oy = oy; } public float getR() { return r; } public void setR(float r) { this.r = r; } public Integer getNum() { return num; } public void setNum(Integer num) { this.num = num; } public boolean isOnTouch() { return onTouch; } public void setOnTouch(boolean onTouch) { this.onTouch = onTouch; } public boolean isPointIn(int x, int y) { double distance = Math.sqrt((x - ox) * (x - ox) + (y - oy) * (y - oy)); return distance < r; } } |
思路:
1.自定义一个 View和MyCircle类,将九个MyCircle类的实例绘制到View中.
2.处理onTouch事件,根据不同的事件修改MyCircle实例的状态,并调用更新invaildate更新View
3.重写onDraw()方法,根据不同的状态去重新绘制整个View
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/lcq5211314123/article/details/40918979
