android自定义View实现手势解锁

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:

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:

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。

以上是 android自定义View实现手势解锁 的全部内容, 来源链接: utcz.com/p/240638.html

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