Android仿手机QQ图案解锁功能

本文实例为大家分享了Android仿手机QQ图案解锁的具体代码，供大家参考，具体内容如下

ps:请不要再问我，为什么导入之后会乱码了。
其实，代码基本上都是从原生系统中提取的：LockPatternView、加密工具类，以及解锁逻辑等，我只是稍作修改，大家都知道，原生系统界面比较丑陋，因此，我特意把QQ的apk解压了，从中拿了几张图案解锁的图片，一个简单的例子就这样诞生了。

好了，废话不多说，我们来看看效果(最后两张是最新4.4系统，炫一下，呵呵)：

1.最关健的就是那个自定义九宫格View，代码来自framework下：LockPatternView，原生系统用的图片资源比较多，好像有7、8张吧，而且绘制的比较复杂，我找寻半天，眼睛都找瞎了，发现解压的QQ里面就3张图片，一个圈圈，两个点，没办法，只能修改代码了，在修改的过程中，才发现，其实可以把原生的LockPatternView给简化，绘制更少的图片，达到更好的效果。总共优化有：①去掉了连线的箭头，②原生的连线只有白色一种，改成根据不同状态显示黄色和红色两张色，③.原生view是先画点再画线，使得线覆盖在点的上面，影响美观，改成先画连线再画点。

关健部分代码onDraw函数：

@Override
protected void onDraw(Canvas canvas) {
 final ArrayList<Cell> pattern = mPattern;
 final int count = pattern.size();
 final boolean[][] drawLookup = mPatternDrawLookup; 

 if (mPatternDisplayMode == DisplayMode.Animate) { 

 // figure out which circles to draw 

 // + 1 so we pause on complete pattern
 final int oneCycle = (count + 1) * MILLIS_PER_CIRCLE_ANIMATING;
 final int spotInCycle = (int) (SystemClock.elapsedRealtime() - mAnimatingPeriodStart)
 % oneCycle;
 final int numCircles = spotInCycle / MILLIS_PER_CIRCLE_ANIMATING; 

 clearPatternDrawLookup();
 for (int i = 0; i < numCircles; i++) {
 final Cell cell = pattern.get(i);
 drawLookup[cell.getRow()][cell.getColumn()] = true;
 } 

 // figure out in progress portion of ghosting line 

 final boolean needToUpdateInProgressPoint = numCircles > 0
 && numCircles < count; 

 if (needToUpdateInProgressPoint) {
 final float percentageOfNextCircle = ((float) (spotInCycle % MILLIS_PER_CIRCLE_ANIMATING))
  / MILLIS_PER_CIRCLE_ANIMATING; 

 final Cell currentCell = pattern.get(numCircles - 1);
 final float centerX = getCenterXForColumn(currentCell.column);
 final float centerY = getCenterYForRow(currentCell.row); 

 final Cell nextCell = pattern.get(numCircles);
 final float dx = percentageOfNextCircle
  * (getCenterXForColumn(nextCell.column) - centerX);
 final float dy = percentageOfNextCircle
  * (getCenterYForRow(nextCell.row) - centerY);
 mInProgressX = centerX + dx;
 mInProgressY = centerY + dy;
 }
 // TODO: Infinite loop here...
 invalidate();
 } 

 final float squareWidth = mSquareWidth;
 final float squareHeight = mSquareHeight; 

 float radius = (squareWidth * mDiameterFactor * 0.5f);
 mPathPaint.setStrokeWidth(radius); 

 final Path currentPath = mCurrentPath;
 currentPath.rewind(); 

 // TODO: the path should be created and cached every time we hit-detect
 // a cell
 // only the last segment of the path should be computed here
 // draw the path of the pattern (unless the user is in progress, and
 // we are in stealth mode)
 final boolean drawPath = (!mInStealthMode || mPatternDisplayMode == DisplayMode.Wrong); 

 // draw the arrows associated with the path (unless the user is in
 // progress, and
 // we are in stealth mode)
 boolean oldFlag = (mPaint.getFlags() & Paint.FILTER_BITMAP_FLAG) != 0;
 mPaint.setFilterBitmap(true); // draw with higher quality since we
   // render with transforms
 // draw the lines
 if (drawPath) {
 boolean anyCircles = false;
 for (int i = 0; i < count; i++) {
 Cell cell = pattern.get(i); 

 // only draw the part of the pattern stored in
 // the lookup table (this is only different in the case
 // of animation).
 if (!drawLookup[cell.row][cell.column]) {
 break;
 }
 anyCircles = true; 

 float centerX = getCenterXForColumn(cell.column);
 float centerY = getCenterYForRow(cell.row);
 if (i == 0) {
 currentPath.moveTo(centerX, centerY);
 } else {
 currentPath.lineTo(centerX, centerY);
 }
 } 

 // add last in progress section
 if ((mPatternInProgress || mPatternDisplayMode == DisplayMode.Animate)
 && anyCircles) {
 currentPath.lineTo(mInProgressX, mInProgressY);
 }
 // chang the line color in different DisplayMode
 if (mPatternDisplayMode == DisplayMode.Wrong)
 mPathPaint.setColor(Color.RED);
 else
 mPathPaint.setColor(Color.YELLOW);
 canvas.drawPath(currentPath, mPathPaint);
 } 

 // draw the circles
 final int paddingTop = getPaddingTop();
 final int paddingLeft = getPaddingLeft(); 

 for (int i = 0; i < 3; i++) {
 float topY = paddingTop + i * squareHeight;
 // float centerY = mPaddingTop + i * mSquareHeight + (mSquareHeight
 // / 2);
 for (int j = 0; j < 3; j++) {
 float leftX = paddingLeft + j * squareWidth;
 drawCircle(canvas, (int) leftX, (int) topY, drawLookup[i][j]);
 }
 } 

 mPaint.setFilterBitmap(oldFlag); // restore default flag
} 

2.第二个值得学习的地方是(代码来自设置应用中)：在创建解锁图案时的枚举使用，原生代码中使用了很多枚举，将绘制图案时的状态、底部两个按钮状态、顶部一个TextView显示的提示文字都紧密的联系起来。因此，只用监听LockPatternView动态变化，对应改变底部Button和顶部TextView的状态即可实现联动，简单的方法可以实现很多代码才能实现的逻辑，个人很喜欢。

①全局的状态：

/**
 * Keep track internally of where the user is in choosing a pattern.
 */
 protected enum Stage {
 // 初始状态
 Introduction(R.string.lockpattern_recording_intro_header,
 LeftButtonMode.Cancel, RightButtonMode.ContinueDisabled,
 ID_EMPTY_MESSAGE, true),
 // 帮助状态
 HelpScreen(R.string.lockpattern_settings_help_how_to_record,
 LeftButtonMode.Gone, RightButtonMode.Ok, ID_EMPTY_MESSAGE,
 false),
 // 绘制过短
 ChoiceTooShort(R.string.lockpattern_recording_incorrect_too_short,
 LeftButtonMode.Retry, RightButtonMode.ContinueDisabled,
 ID_EMPTY_MESSAGE, true),
 // 第一次绘制图案
 FirstChoiceValid(R.string.lockpattern_pattern_entered_header,
 LeftButtonMode.Retry, RightButtonMode.Continue,
 ID_EMPTY_MESSAGE, false),
 // 需要再次绘制确认
 NeedToConfirm(R.string.lockpattern_need_to_confirm,
 LeftButtonMode.Cancel, RightButtonMode.ConfirmDisabled,
 ID_EMPTY_MESSAGE, true),
 // 确认出错
 ConfirmWrong(R.string.lockpattern_need_to_unlock_wrong,
 LeftButtonMode.Cancel, RightButtonMode.ConfirmDisabled,
 ID_EMPTY_MESSAGE, true),
 // 选择确认
 ChoiceConfirmed(R.string.lockpattern_pattern_confirmed_header,
 LeftButtonMode.Cancel, RightButtonMode.Confirm,
 ID_EMPTY_MESSAGE, false); 

 /**
 * @param headerMessage
 * The message displayed at the top.
 * @param leftMode
 * The mode of the left button.
 * @param rightMode
 * The mode of the right button.
 * @param footerMessage
 * The footer message.
 * @param patternEnabled
 * Whether the pattern widget is enabled.
 */
 Stage(int headerMessage, LeftButtonMode leftMode,
 RightButtonMode rightMode, int footerMessage,
 boolean patternEnabled) {
 this.headerMessage = headerMessage;
 this.leftMode = leftMode;
 this.rightMode = rightMode;
 this.footerMessage = footerMessage;
 this.patternEnabled = patternEnabled;
 } 

 final int headerMessage;
 final LeftButtonMode leftMode;
 final RightButtonMode rightMode;
 final int footerMessage;
 final boolean patternEnabled;
 } 

②.底部两个按钮的状态枚举：

/**
 * The states of the left footer button.
 */
 enum LeftButtonMode {
 // 取消
 Cancel(android.R.string.cancel, true),
 // 取消时禁用
 CancelDisabled(android.R.string.cancel, false),
 // 重试
 Retry(R.string.lockpattern_retry_button_text, true),
 // 重试时禁用
 RetryDisabled(R.string.lockpattern_retry_button_text, false),
 // 消失
 Gone(ID_EMPTY_MESSAGE, false); 

 /**
 * @param text
 * The displayed text for this mode.
 * @param enabled
 * Whether the button should be enabled.
 */
 LeftButtonMode(int text, boolean enabled) {
 this.text = text;
 this.enabled = enabled;
 } 

 final int text;
 final boolean enabled;
 } 

 /**
 * The states of the right button.
 */
 enum RightButtonMode {
 // 继续
 Continue(R.string.lockpattern_continue_button_text, true),
 //继续时禁用
 ContinueDisabled(R.string.lockpattern_continue_button_text, false),
 //确认
 Confirm(R.string.lockpattern_confirm_button_text, true),
 //确认是禁用
 ConfirmDisabled(R.string.lockpattern_confirm_button_text, false),
 //OK
 Ok(android.R.string.ok, true); 

 /**
 * @param text
 * The displayed text for this mode.
 * @param enabled
 * Whether the button should be enabled.
 */
 RightButtonMode(int text, boolean enabled) {
 this.text = text;
 this.enabled = enabled;
 } 

 final int text;
 final boolean enabled;
 } 

就这样，只要LockPatternView的状态一发生改变，就会动态改变底部两个Button的文字和状态。很简洁，逻辑性很强。

3.第三个个人觉得比较有用的就是加密这一块了，为了以后方便使用，我把图案加密和字符加密分成两个工具类：LockPatternUtils和LockPasswordUtils两个文件，本文使用到的是LockPatternUtils。其实所谓的图案加密也是将其通过SHA-1加密转化成二进制数再保存到文件中(原生系统保存在/system/目录下，我这里没有权限，就保存到本应用目录下)，解密时，也是将获取到用户的输入通过同样的方法加密，再与保存到文件中的对比，相同则密码正确，不同则密码错误。关健代码就是以下4个函数：

/**
 * Serialize a pattern. 加密
 *
 * @param pattern
 * The pattern.
 * @return The pattern in string form.
 */
public static String patternToString(List<LockPatternView.Cell> pattern) {
 if (pattern == null) {
 return "";
 }
 final int patternSize = pattern.size(); 

 byte[] res = new byte[patternSize];
 for (int i = 0; i < patternSize; i++) {
 LockPatternView.Cell cell = pattern.get(i);
 res[i] = (byte) (cell.getRow() * 3 + cell.getColumn());
 }
 return new String(res);
} 

/**
 * Save a lock pattern.
 *
 * @param pattern
 * The new pattern to save.
 * @param isFallback
 * Specifies if this is a fallback to biometric weak
 */
public void saveLockPattern(List<LockPatternView.Cell> pattern) {
 // Compute the hash
 final byte[] hash = LockPatternUtils.patternToHash(pattern);
 try {
 // Write the hash to file
 RandomAccessFile raf = new RandomAccessFile(sLockPatternFilename,
 "rwd");
 // Truncate the file if pattern is null, to clear the lock
 if (pattern == null) {
 raf.setLength(0);
 } else {
 raf.write(hash, 0, hash.length);
 }
 raf.close();
 } catch (FileNotFoundException fnfe) {
 // Cant do much, unless we want to fail over to using the settings
 // provider
 Log.e(TAG, "Unable to save lock pattern to " + sLockPatternFilename);
 } catch (IOException ioe) {
 // Cant do much
 Log.e(TAG, "Unable to save lock pattern to " + sLockPatternFilename);
 }
} 

/*
 * Generate an SHA-1 hash for the pattern. Not the most secure, but it is at
 * least a second level of protection. First level is that the file is in a
 * location only readable by the system process.
 *
 * @param pattern the gesture pattern.
 *
 * @return the hash of the pattern in a byte array.
 */
private static byte[] patternToHash(List<LockPatternView.Cell> pattern) {
 if (pattern == null) {
 return null;
 } 

 final int patternSize = pattern.size();
 byte[] res = new byte[patternSize];
 for (int i = 0; i < patternSize; i++) {
 LockPatternView.Cell cell = pattern.get(i);
 res[i] = (byte) (cell.getRow() * 3 + cell.getColumn());
 }
 try {
 MessageDigest md = MessageDigest.getInstance("SHA-1");
 byte[] hash = md.digest(res);
 return hash;
 } catch (NoSuchAlgorithmException nsa) {
 return res;
 }
} 

/**
 * Check to see if a pattern matches the saved pattern. If no pattern
 * exists, always returns true.
 *
 * @param pattern
 * The pattern to check.
 * @return Whether the pattern matches the stored one.
 */
public boolean checkPattern(List<LockPatternView.Cell> pattern) {
 try {
 // Read all the bytes from the file
 RandomAccessFile raf = new RandomAccessFile(sLockPatternFilename,
 "r");
 final byte[] stored = new byte[(int) raf.length()];
 int got = raf.read(stored, 0, stored.length);
 raf.close();
 if (got <= 0) {
 return true;
 }
 // Compare the hash from the file with the entered pattern's hash
 return Arrays.equals(stored,
 LockPatternUtils.patternToHash(pattern));
 } catch (FileNotFoundException fnfe) {
 return true;
 } catch (IOException ioe) {
 return true;
 }
}

好了，代码就分析到这里，非常感谢你看到了文章末尾。

本文源码(utf-8编码)：Android仿手机QQ图案解锁

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我们。