【Android Lock Pattern】图案解锁(一):LockPatternView源代码

选择Settings -> Security ->Set up screen lock

设置屏幕锁

选择Pattern

设置图案

在我的真机HTC Desire(Android 2.2)上,截图如下:

Android是一个开源的操作系统,所以我们可以通过下载该控件的源代码重用该控件。

 

1、LockPatterView源代码

图案解锁控件,对应着framework层的LockPatterView类,如下所示:

源代码:https://github.com/android/platform_frameworks_base/blob/master/core/java/com/android/internal/widget/LockPatternView.java

 

2、修改

下载的LockPatternView.java文件,无法在项目中直接使用,需要进行修改。

1)添加图片文件

添加6张图片文件到res/drawable:

对应LockPatternView.java的代码

mBitmapBtnDefault = getBitmapFor(R.drawable.btn_code_lock_default_holo);
mBitmapBtnTouched = getBitmapFor(R.drawable.btn_code_lock_touched_holo);
mBitmapCircleDefault = getBitmapFor(R.drawable.indicator_code_lock_point_area_default_holo);
mBitmapCircleGreen = getBitmapFor(R.drawable.indicator_code_lock_point_area_green_holo);
mBitmapCircleRed = getBitmapFor(R.drawable.indicator_code_lock_point_area_red_holo);

mBitmapArrowGreenUp = getBitmapFor(R.drawable.indicator_code_lock_drag_direction_green_up);
mBitmapArrowRedUp = getBitmapFor(R.drawable.indicator_code_lock_drag_direction_red_up);

btn_code_lock_default_holo.png

btn_code_lock_touched_holo.png

indicator_code_lock_point_area_default_holo.png

indicator_code_lock_point_area_green_holo.png

indicator_code_lock_point_area_red_holo.png

indicator_code_lock_drag_direction_green_up.png

indicator_code_lock_drag_direction_red_up.png

 

2)添加attrs配置文件

添加attrs.xml文件到res/values

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <declare-styleable name="LockPatternView">
        <attr name="aspect" format="string" />
    </declare-styleable>
</resources>

 

3)更新strings配置文件

在res/strings.xml添加新的<string/>

<!-- Accessibility description sent when user starts drawing a lock pattern. -->
<string name="lockscreen_access_pattern_start">Pattern started</string>
<!-- Accessibility description sent when the pattern times out and is cleared. -->
<string name="lockscreen_access_pattern_cleared">Pattern cleared</string>
<!-- Accessibility description sent when user adds a cell to the pattern.  -->
<string name="lockscreen_access_pattern_cell_added">Cell added</string>
<!-- Accessibility description sent when user completes drawing a pattern. -->
<string name="lockscreen_access_pattern_detected">Pattern completed</string>

 

4)修改代码

修改mPaddingLeft为getPaddingLeft(),mPaddingRight为getPaddingRight(),mPaddingTop为getPaddingTop(),mPaddingBottom为getPaddingBottom()

修改mContext为getContext()

修改方法private void sendAccessEvent(int resId)

private void sendAccessEvent(int resId) {
    setContentDescription(getContext().getString(resId));
    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
    setContentDescription(null);
}

 

5)添加类LockPatternUtils

新建LockPatternUtils.java文件,实现public static String patternToString(List<LockPatternView.Cell> pattern)和public static List<LockPatternView.Cell> stringToPattern(String string)方法

具体可以参考Android的LockPatternUtils类

源代码:https://github.com/android/platform_frameworks_base/blob/master/core/java/com/android/internal/widget/LockPatternUtils.java

 

3、使用

LockPatternView的使用与其它View相同,并提供了事件的回调处理的方法public void setOnPatternListener(OnPatternListener onPatternListener)和接口LockPatternView.OnPatternListener

 

参考:http://www.eoeandroid.com/forum.php?mod=viewthread&tid=231102

 

 

posted on 2012-12-03 17:27  Anthony Li  阅读(16316)  评论(2编辑  收藏

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