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Android框架浅析之锁屏(Keyguard)机制原理

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最近终于成功的摆脱了FM收音机,迈向了新的模块:锁屏、状态栏、Launcher---姑且称之为“IDLE”小组,或许叫手机

美容小组,要是能施展下周星星同学的还我漂漂拳,岂不快哉。 OK,闲话打住,咱开始正文。

本文主要内容:


1、分析锁屏界面的组成 ;

2、基于源代码分析锁屏相关类 ;

3、提出一种在框架取消锁屏的方法 。

花了一些时间研究Android原生的锁屏框架---Keyguard,今天就慢慢的讲解下我自己对这个模块的总结,因为目前还处于

理论学习的状况,很多细节以及功能上的实现有待后续的补充完整。

本文分析适合Android2.2和2.3版本,Android4.0尚不清楚。整个锁屏源码基本上完全一样,只是改变了文件存放路径而已。

本文分析版本具体是Android2.3版本。


源文件路径主要有两个:

frameworks\base\policy\src\com\android\internal\policy\impl\ ---->锁屏框架

frameworks\base\core\java\com\android\internal\widget\ ----> 提供了一些的自定义View.


一、锁屏界面的组成


通常 Android手机上大家常见的界面只有一种,成功后即可解锁进入界面了。其实在Android手机中,正常的锁屏界面由

两种不同性质的界面组成:


第一种界面称之为LockScreen界面(为了叙述方便,我们姑且称为“解锁界面),即我们通常所见到的界面,手机厂商一般定制

界面。界面如下所示:

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该界面对应自定义View的是LockScreen.java类

路径位于:frameworks\policies\base\phone\com\android\internal\policy\impl\LockScreen.java

第二种界面称之为UnLockScreen(为了后文叙述方便,我们姑且称为“开锁界面”),一般由Android源码提供,有如下四种

①、图案开锁界面 ---- PatternUnlockScreen.java类 (自定义LinearLayout)

路径位于:frameworks\policies\base\phone\com\android\internal\policy\impl\PatternUnlockScreen.java

界面显示为:

bubuko.com,布布扣


②、PIN开锁界面 ---- SimUnlockScreen.java 类 (自定义LinearLayout)

路径位于:frameworks\policies\base\phone\com\android\internal\policy\impl\SimUnlockScreen.java

界面显示为: (图片省略)

③、密码开锁界面 ---- PasswordUnlockScreen.java类 (自定义LinearLayout)

路径位于:frameworks\policies\base\phone\com\android\internal\policy\impl\PasswordUnlockScreen.java

界面显示为:

bubuko.com,布布扣


④、GoogleAccount 开锁界面 ,即Google账户开锁界面。一般用于当用户输入密码错误次数超过上限值时,系统会提示

你输入Google账户去开锁。注意:开启它需要你手动设置账户与同步,否则该界面是不会出来的。

对应的源文件是: AccountUnlockScreen.java类 (自定义LinearLayout)

路径位于:frameworks\policies\base\phone\com\android\internal\policy\impl\AccountUnlockScreen.java

界面显示为:

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可以按照如下办法选择开启哪一种开锁界面: 设置—>位置和安全—>设置屏幕锁定 ,具体选择那种开锁界面。

显示规则

当然,这两种界面的组合也是有很多变化的,总的规则如下:

首先显示LockScreen界面,接着判断是否开启了UnLockScreen界面,如果设置了UnLockScreen界面,则进入对应的

UnLockScreen界面去解锁,才算成功解锁。但,存在一种特殊的情况,就是假如我们选择了图案 UnLockScreen界面,是不会

显示LockScreen界面,而只会显示UnLockScreen界面。

二、锁屏界面的实现


我们知道, 任何一种界面都是由各种View/ViewGroup(当然包括自定义的)组成的,然后根据系统对应的状态值的改变去更新

这些View的显示状态,锁屏界面自然也是如此。锁屏界面的实现最顶层是采用了FrameLayout去控制的,当然内部也嵌套了很

层,内嵌层数的增多的一点好处就是我们可以分开而治,具体针对每层去做相应的更新。难处就是看代码看的很蛋疼。


当界面复杂时,我不得不提Google为开发人员提供的一款优秀工具了---Hierarchy Viewer ,通过它,我们很清晰的弄明白整

View树的继承层次,一个布局结构,当然,看源代码也是必须的。

关于Hierarchy Viewer的使用请参考该博客:

Android 实用工具Hierarchy Viewer实


整个锁屏界面的继承层次如下(部分以及设置了图案开锁界面),更加完整的图请使用Hierarchy Viewer 工具查看。


bubuko.com,布布扣


上图中比较重要的几个视图说明如下:

LockPatternKeyguardView 继承至FrameLayout :作为LockScreen和UnLockScreen的载体,用来控制显示LockScreen

还是UnLockScreen界面。

LockScreen 继承至FrameLayout

PatterUnlockScreen ViewGroup类型 : 图案解锁界面

KeyguardViewHost继承至FrameLayout, 该ViewGroup作为顶层View,作为WindowManager的装饰对象添加至窗口。

它和LockPatternKeyguardView关系相当于DecorView和我们Activity内设置的资源布局一样。


三、锁屏机制的类结构说明


看了几天代码,才稍微的理清了下头绪。看完后给我的感觉就是代码之间太BT了,几个类的唯一实例传来传去,太容易混

乱了。接下来我们分析下一些主要的类及其重要的函数,更多函数实现,大家可以自己参考源代码。


PS : 由于这些类的结构图比较简单,因此就没画类图了。主要是从源码角度来分析这些代码逻辑。


1、 KeyguardScreen 类 接口


功能:该接口的主要功能是为每个需要显示的界面:LockScreen或者UnLockScreen定义了四个方法,使其在不同的状态能够

得到相应处理。优点就是: 利用设计原则的面向接口编程,减少对具体对象的依赖。

路径:\frameworks\base\policy\src\com\android\internal\policy\impl\KeyguardScreen.java

其源代码释义如下:

  1. /**
  2. * Common interface of each {@link android.view.View} that is a screen of
  3. * {@link LockPatternKeyguardView}.
  4. */
  5. public interface KeyguardScreen {
  6. /** Return true if your view needs input, so should allow the soft
  7. * keyboard to be displayed. */
  8. boolean needsInput(); //View是否需要输入数值,即该界面需要键盘输入数值
  9. /** This screen is no longer in front of the user.*/
  10. void onPause();//当该界面不处于前台界面时调用,包括处于GONE或者该界面即将被remove掉
  11. /** This screen is going to be in front of the user. */
  12. void onResume();//相对于onPause()方法,当该界面不处于前台界面时调用,处于VISIBLE状态时调用
  13. /** This view is going away; a hook to do cleanup. */
  14. void cleanUp();//该界面即将被remove掉 ,即不在需要
  15. }
/**
 * Common interface of each {@link android.view.View} that is a screen of
 * {@link LockPatternKeyguardView}.
 */ 
public interface KeyguardScreen {
    /** Return true if your view needs input, so should allow the soft
     * keyboard to be displayed. */
    boolean needsInput(); //View是否需要输入数值,即该界面需要键盘输入数值 
    /** This screen is no longer in front of the user.*/
    void onPause();//当该界面不处于前台界面时调用,包括处于GONE或者该界面即将被remove掉
    /** This screen is going to be in front of the user. */
    void onResume();//相对于onPause()方法,当该界面不处于前台界面时调用,处于VISIBLE状态时调用
    /** This view is going away; a hook to do cleanup. */
    void cleanUp();//该界面即将被remove掉 ,即不在需要
}


2、KeyguardScreenCallback类 接口


功能:每个需要显示的界面:LockScreen或者UnLockScreen都保存了该对象的唯一实例,用来向控制界面汇报情况。

路径:frameworks\base\policy\src\com\android\internal\policy\impl\KeyguardScreenCallback.java

其源代码释义如下:

  1. /** Within a keyguard, there may be several screens that need a callback
  2. * to the host keyguard view.
  3. */
  4. public interface KeyguardScreenCallback extends KeyguardViewCallback {
  5. /** Transition to the lock screen*/
  6. void goToLockScreen(); //当前界面跳转为LockScreen ,而不是UnLockScreen
  7. /** Transition to the unlock screen.*/
  8. void goToUnlockScreen();//LockScreen成功开锁 ,是否需要显示UnLockScreen,否则,直接开锁成功。
  9. //忘记了开锁图案,即我们需要跳转到Google 账户去开锁。
  10. void forgotPattern(boolean isForgotten);
  11. boolean isSecure();//当前机器是否安全,例如:设置了图案、密码开锁等
  12. //该函数还不太懂,可能是是否只需要验证UnlockScreen界面,即可成功开锁。
  13. boolean isVerifyUnlockOnly();
  14. /**Stay on me, but recreate me (so I can use a different layout).*/
  15. void recreateMe(Configuration config); //重新根据手机当前状态,显示对应的Screen.
  16. /** Take action to send an emergency call. */
  17. void takeEmergencyCallAction(); //紧急呼叫时的处理行为.
  18. /** Report that the user had a failed attempt to unlock with password or pattern.*/
  19. void reportFailedUnlockAttempt(); //在UnLockScreen界面登陆失败时处理
  20. /** Report that the user successfully entered their password or pattern.*/
  21. void reportSuccessfulUnlockAttempt();//在UnLockScreen界面登陆成功时处理
  22. /** Report whether we there‘s another way to unlock the device.
  23. * @return true */
  24. boolean doesFallbackUnlockScreenExist();
  25. }
/** Within a keyguard, there may be several screens that need a callback
 * to the host keyguard view.
 */ 
public interface KeyguardScreenCallback extends KeyguardViewCallback {
    /** Transition to the lock screen*/
    void goToLockScreen();  //当前界面跳转为LockScreen ,而不是UnLockScreen
    /** Transition to the unlock screen.*/
    void goToUnlockScreen();//LockScreen成功开锁 ,是否需要显示UnLockScreen,否则,直接开锁成功。
    //忘记了开锁图案,即我们需要跳转到Google 账户去开锁。
    void forgotPattern(boolean isForgotten);
    boolean isSecure();//当前机器是否安全,例如:设置了图案、密码开锁等   
    //该函数还不太懂,可能是是否只需要验证UnlockScreen界面,即可成功开锁。
    boolean isVerifyUnlockOnly();
    /**Stay on me, but recreate me (so I can use a different layout).*/
    void recreateMe(Configuration config); //重新根据手机当前状态,显示对应的Screen.
    /** Take action to send an emergency call. */
    void takeEmergencyCallAction();  //紧急呼叫时的处理行为.

    /** Report that the user had a failed attempt to unlock with password or pattern.*/
    void reportFailedUnlockAttempt(); //在UnLockScreen界面登陆失败时处理

    /** Report that the user successfully entered their password or pattern.*/
    void reportSuccessfulUnlockAttempt();//在UnLockScreen界面登陆成功时处理

    /** Report whether we there‘s another way to unlock the device.
     * @return true */
    boolean doesFallbackUnlockScreenExist();
}

其唯一实现类位于LockPatternKeyguardView类的内部类(稍后讲到)。


3、KeyguardViewCallback类 接口


功能: 提供了一些接口用来接受用户操作Screen的结果。

路径:frameworks\base\policy\src\com\android\internal\policy\impl\KeyguardViewCallback.java

其源代码释义如下:

  1. /**
  2. * The callback used by the keyguard view to tell the {@link KeyguardViewMediator}
  3. * various things.
  4. */
  5. public interface KeyguardViewCallback {
  6. /** Request the wakelock to be poked for the default amount of time. */
  7. void pokeWakelock(); //保存屏幕在一定时间内处于亮屏状况 , 默认时间为5s或者10s
  8. /** Request the wakelock to be poked for a specific amount of time. */
  9. void pokeWakelock(int millis);//根据给定时间值,使屏幕在该事件段内保持亮屏状况
  10. /** Report that the keyguard is done.
  11. * @param authenticated Whether the user securely got past the keyguard.
  12. * the only reason for this to be false is if the keyguard was instructed
  13. * to appear temporarily to verify the user is supposed to get past the
  14. * keyguard, and the user fails to do so. */
  15. //成功的完成开锁,可以进入手机界面了。参数为ture表示是否正大光明的开锁,例如:图案正确,密码输入正确。
  16. void keyguardDone(boolean authenticated);
  17. /**Report that the keyguard is done drawing. */
  18. void keyguardDoneDrawing(); //整个锁屏界面draw()过程绘制完成时,回调该方法.
  19. }
/**
  * The callback used by the keyguard view to tell the {@link KeyguardViewMediator} 
  * various things.
  */
 public interface KeyguardViewCallback {

     /** Request the wakelock to be poked for the default amount of time. */
     void pokeWakelock();  //保存屏幕在一定时间内处于亮屏状况 , 默认时间为5s或者10s
     /** Request the wakelock to be poked for a specific amount of time.  */
     void pokeWakelock(int millis);//根据给定时间值,使屏幕在该事件段内保持亮屏状况

     /** Report that the keyguard is done.
      * @param authenticated Whether the user securely got past the keyguard.
      *   the only reason for this to be false is if the keyguard was instructed
      *   to appear temporarily to verify the user is supposed to get past the
      *   keyguard, and the user fails to do so. */
     //成功的完成开锁,可以进入手机界面了。参数为ture表示是否正大光明的开锁,例如:图案正确,密码输入正确。
     void keyguardDone(boolean authenticated); 
     /**Report that the keyguard is done drawing. */
     void keyguardDoneDrawing(); //整个锁屏界面draw()过程绘制完成时,回调该方法.
 }


其唯一实现类是 KeyguardViewMediator类(稍后讲到)


4、 KeyguardWindowController类 接口


功能:提供通用 接口,判断该界面是否需要显示输入法窗口。

其源代码释义如下:

  1. /**
  2. * Interface passed to the keyguard view, for it to call up to control
  3. * its containing window.
  4. */
  5. public interface KeyguardWindowController {
  6. /** Control whether the window needs input -- that is if it has
  7. * text fields and thus should allow input method interaction. */
  8. void setNeedsInput(boolean needsInput); //是否需要显示输入法,为true表示需要。该方法可以想上层报到是否需要显示输入法窗口
  9. }
/**
 * Interface passed to the keyguard view, for it to call up to control
 * its containing window.
 */
public interface KeyguardWindowController {
    /** Control whether the window needs input -- that is if it has
     * text fields and thus should allow input method interaction. */
    void setNeedsInput(boolean needsInput);  //是否需要显示输入法,为true表示需要。该方法可以想上层报到是否需要显示输入法窗口
}

其唯一实现类是KeyguardViewManager类(稍后讲到)。

5、KeyguardViewManager


功能:包装了WindowManager功能了,提供了添加、删除锁屏界面的功能。

其源代码释义如下:

  1. public class KeyguardViewManager implements KeyguardWindowController {
  2. ...
  3. private WindowManager.LayoutParams mWindowLayoutParams;
  4. private boolean mNeedsInput = false; //是否需要输入法 , 默认不需要
  5. private FrameLayout mKeyguardHost; //该ViewGroup作为顶层View,作为WindowManager添加至窗口
  6. private KeyguardViewBase mKeyguardView; //具体窗口内容。
  7. //以上两种的关系相当于DecorView和我们Activity内设置的资源文件一样
  8. private boolean mScreenOn = false; //是否处于亮屏状态
  9. //构造函数,初始化各种属性
  10. public KeyguardViewManager(Context context, ViewManager viewManager,
  11. KeyguardViewCallback callback, KeyguardViewProperties keyguardViewProperties, KeyguardUpdateMonitor updateMonitor) {
  12. ...
  13. }
  14. /**
  15. * Helper class to host the keyguard view.
  16. */
  17. private static class KeyguardViewHost extends FrameLayout {
  18. ... //KeyguardViewHost类
  19. }
  20. /**
  21. * Show the keyguard. Will handle creating and attaching to the view manager
  22. * lazily.
  23. */ //显示锁屏界面
  24. public synchronized void show() {
  25. if (mKeyguardHost == null) {
  26. ...
  27. mViewManager.addView(mKeyguardHost, lp);
  28. }
  29. if (mKeyguardView == null) {
  30. ...
  31. mKeyguardHost.addView(mKeyguardView, lp);
  32. if (mScreenOn) {
  33. mKeyguardView.onScreenTurnedOn();
  34. }
  35. }
  36. ...
  37. }
  38. ...
  39. /*** Hides the keyguard view */
  40. public synchronized void hide() { //隐藏锁屏界面,也就是说我们成功的解锁了
  41. if (mKeyguardHost != null) {
  42. mKeyguardHost.setVisibility(View.GONE);
  43. ...
  44. }
  45. }
  46. //锁屏界面是否处于显示状态
  47. public synchronized boolean isShowing() {
  48. return (mKeyguardHost != null && mKeyguardHost.getVisibility() == View.VISIBLE);
  49. }
  50. }
  51. }
public class KeyguardViewManager implements KeyguardWindowController {
	 ...
     private WindowManager.LayoutParams mWindowLayoutParams;
     private boolean mNeedsInput = false; //是否需要输入法 , 默认不需要

     private FrameLayout mKeyguardHost;   //该ViewGroup作为顶层View,作为WindowManager添加至窗口
     private KeyguardViewBase mKeyguardView; //具体窗口内容。
     //以上两种的关系相当于DecorView和我们Activity内设置的资源文件一样

     private boolean mScreenOn = false; //是否处于亮屏状态
     //构造函数,初始化各种属性
     public KeyguardViewManager(Context context, ViewManager viewManager,
             KeyguardViewCallback callback, KeyguardViewProperties keyguardViewProperties, KeyguardUpdateMonitor updateMonitor) {
        ...
     }
     /**
      * Helper class to host the keyguard view.
      */
     private static class KeyguardViewHost extends FrameLayout {
         ... //KeyguardViewHost类
     }

     /**
      * Show the keyguard.  Will handle creating and attaching to the view manager
      * lazily.
      */  //显示锁屏界面
     public synchronized void show() {       
         if (mKeyguardHost == null) {
             ...
             mViewManager.addView(mKeyguardHost, lp);
         }
         if (mKeyguardView == null) {
             ...
             mKeyguardHost.addView(mKeyguardView, lp);
             if (mScreenOn) {
                 mKeyguardView.onScreenTurnedOn();
             }
         }
        ...
     }
     ...

     /*** Hides the keyguard view */
     public synchronized void hide() { //隐藏锁屏界面,也就是说我们成功的解锁了
         if (mKeyguardHost != null) {
             mKeyguardHost.setVisibility(View.GONE);
                 ...
             }
     }
     //锁屏界面是否处于显示状态
     public synchronized boolean isShowing() {
         return (mKeyguardHost != null && mKeyguardHost.getVisibility() == View.VISIBLE);
     }
 }


}

6、 KeyguardUpdateMonitor.java类


功能:该类的主要功能就是根据监视系统状态值的改变(例如:时间、SIM卡状态、电池电量;使用广播监听),根据这种状态

值的改变回调监听了该状态信息的对象实例。

其源代码释义如下:

  1. public class KeyguardUpdateMonitor {
  2. ...
  3. private int mFailedAttempts = 0; //当前登录事,已经失败的次数
  4. private ArrayList<InfoCallback> mInfoCallbacks; //保存所有监听对象 InfoCallback
  5. private ArrayList<SimStateCallback> mSimStateCallbacks ; //保存所有监听对象 SimStateCallback
  6. private static class SimArgs { //Sim状态信息
  7. ...
  8. }
  9. /**
  10. * Callback for general information relevant to lock screen.
  11. */
  12. interface InfoCallback {
  13. //电池电量信息改变:参数含义分别如下:是否显示电量信息 、 是否插入电影充电、 当前电池电量值
  14. void onRefreshBatteryInfo(boolean showBatteryInfo, boolean pluggedIn, int batteryLevel);
  15. void onTimeChanged(); //时间发生了改变
  16. //网络运营商状态发生了改变 ,例如从中国移动2G变为中国移动3G,或者无服务等 ;
  17. void onRefreshCarrierInfo(CharSequence plmn, CharSequence spn);
  18. /** Called when the ringer mode changes. */
  19. void onRingerModeChanged(int state);
  20. /** 电话状态发生了改变 值可能为:EXTRA_STATE_IDLE、EXTRA_STATE_RINGING、EXTRA_STATE_OFFHOOK*/
  21. void onPhoneStateChanged(String newState);
  22. }
  23. /** Callback to notify of sim state change. */
  24. interface SimStateCallback {
  25. void onSimStateChanged(IccCard.State simState); //Sim卡信息发生了改变,例如有正常状况变为ABSENT/MISSING状态
  26. }
  27. /*** Register to receive notifications about general keyguard information
  28. * (see {@link InfoCallback}. */
  29. public void registerInfoCallback(InfoCallback callback) {
  30. if (!mInfoCallbacks.contains(callback)) {
  31. mInfoCallbacks.add(callback); //注册一个监听器
  32. } ...
  33. }
  34. ...
  35. }
public class KeyguardUpdateMonitor {
    ...
    private int mFailedAttempts = 0;  //当前登录事,已经失败的次数
    private ArrayList<InfoCallback> mInfoCallbacks; //保存所有监听对象 InfoCallback
    private ArrayList<SimStateCallback> mSimStateCallbacks ; //保存所有监听对象  SimStateCallback
    private static class SimArgs {  //Sim状态信息
      ...
    }
    /**
     * Callback for general information relevant to lock screen.
     */
    interface InfoCallback {
    	//电池电量信息改变:参数含义分别如下:是否显示电量信息  、 是否插入电影充电、 当前电池电量值
        void onRefreshBatteryInfo(boolean showBatteryInfo, boolean pluggedIn, int batteryLevel);
        void onTimeChanged(); //时间发生了改变
        //网络运营商状态发生了改变 ,例如从中国移动2G变为中国移动3G,或者无服务等 ;
        void onRefreshCarrierInfo(CharSequence plmn, CharSequence spn); 
        /** Called when the ringer mode changes. */
        void onRingerModeChanged(int state);
        /** 电话状态发生了改变  值可能为:EXTRA_STATE_IDLE、EXTRA_STATE_RINGING、EXTRA_STATE_OFFHOOK*/
        void onPhoneStateChanged(String newState);
    }
    /** Callback to notify of sim state change. */
    interface SimStateCallback {
        void onSimStateChanged(IccCard.State simState); //Sim卡信息发生了改变,例如有正常状况变为ABSENT/MISSING状态
    }

    /*** Register to receive notifications about general keyguard information
     * (see {@link InfoCallback}. */
    public void registerInfoCallback(InfoCallback callback) {
        if (!mInfoCallbacks.contains(callback)) {
            mInfoCallbacks.add(callback);  //注册一个监听器
        } ...
    }
   ...
 }



7, LockPatternKeyguardView类 (自定义ViewGroup)

功能:作为LockScreen和UnLockScreen界面的载体,控制显示哪个界面。

其源代码释义如下:

  1. public class LockPatternKeyguardView extends KeyguardViewBase {
  2. ...
  3. private View mLockScreen;
  4. private View mUnlockScreen;
  5. private boolean mScreenOn = false;//是否亮屏
  6. enum Mode {
  7. //当前显示界面的Mode Lock 或者UnLock
  8. }
  9. enum UnlockMode {
  10. ...//开锁界面的几种不同Mode
  11. }
  12. //构造函数
  13. public LockPatternKeyguardView( ...) {
  14. //KeyguardScreenCallback的实现对象
  15. mKeyguardScreenCallback = new KeyguardScreenCallback() {
  16. ...
  17. };
  18. ...
  19. }
  20. public void reset() {
  21. ...//重置显示界面
  22. }
  23. private void recreateLockScreen() {
  24. ...//重新构建LockScreen
  25. }
  26. private void recreateUnlockScreen() {
  27. ...//重新构建UnlockScreen
  28. }
  29. private void recreateScreens() {
  30. ...//重新构建该视图
  31. }
  32. public void verifyUnlock() {
  33. ...
  34. }
  35. public void cleanUp() {
  36. ... //清理资源对象
  37. }
  38. private boolean isSecure() {
  39. ...//手机设置是否处于安全状态
  40. }
  41. private void updateScreen(final Mode mode) {
  42. ...//根据参数(Lock/unLock),判断显示为LockScreen或者UnlockScreen界面
  43. }
  44. View createLockScreen() {
  45. ...//创建lockScreen
  46. }
  47. View createUnlockScreenFor(UnlockMode unlockMode) {
  48. ...//根据不同的Unlock Mode , 创建不同的UnlockScreen
  49. }
  50. private Mode getInitialMode() {
  51. ...//得到初始化的状态Mode (lock or unlock).
  52. }
  53. /** Given the current state of things, what should the unlock screen be? */
  54. private UnlockMode getUnlockMode() {
  55. ...//返回开锁的状态Unlock Mode
  56. }
  57. private void showTimeoutDialog() {
  58. ... //输入密码超过一定次数时,提示30s后在登录的对话框
  59. }
  60. private void showAlmostAtAccountLoginDialog() {
  61. ... //显示Google 账户登录对话框
  62. }
  63. }
public class LockPatternKeyguardView extends KeyguardViewBase {
     ...
     private View mLockScreen;
     private View mUnlockScreen;

     private boolean mScreenOn = false;//是否亮屏

     enum Mode {
         //当前显示界面的Mode Lock 或者UnLock
     }
     enum UnlockMode {
         ...//开锁界面的几种不同Mode 
     }
     //构造函数
     public LockPatternKeyguardView( ...) {     
         //KeyguardScreenCallback的实现对象
         mKeyguardScreenCallback = new KeyguardScreenCallback() {
            ...
         };
         ...
     }
     public void reset() {
        ...//重置显示界面
     }
     private void recreateLockScreen() {
    	...//重新构建LockScreen
     }
     private void recreateUnlockScreen() {
        ...//重新构建UnlockScreen
     }
     private void recreateScreens() {
        ...//重新构建该视图
     }
     public void verifyUnlock() {
        ... 
     }
     public void cleanUp() {
    	... //清理资源对象
     }
     private boolean isSecure() {
        ...//手机设置是否处于安全状态
     }
     private void updateScreen(final Mode mode) {
        ...//根据参数(Lock/unLock),判断显示为LockScreen或者UnlockScreen界面
     }
     View createLockScreen() {
    	...//创建lockScreen
     }
     View createUnlockScreenFor(UnlockMode unlockMode) {
        ...//根据不同的Unlock Mode , 创建不同的UnlockScreen
     }
     private Mode getInitialMode() {
        ...//得到初始化的状态Mode (lock or unlock).
     }
     /** Given the current state of things, what should the unlock screen be? */
     private UnlockMode getUnlockMode() {
        ...//返回开锁的状态Unlock Mode
     }
     private void showTimeoutDialog() {
         ... //输入密码超过一定次数时,提示30s后在登录的对话框
     }
     private void showAlmostAtAccountLoginDialog() {
        ... //显示Google 账户登录对话框
     }
 }



8、KeyguardViewBase类 抽象类 (自定义ViewGroup)


功能:为LockPatternKeyguardView提供了一组通用的方法 。需要值得注意的方法就是他对某些KeyEvent的监听,

当他消费监听到这些KeyEvent,我们的App就监听不到这些KeyEvent了 。常用的有KEYEVENT_VOLUME_UP/DOWN等。

  1. public abstract class KeyguardViewBase extends FrameLayout {
  2. ...
  3. @Override
  4. public boolean dispatchKeyEvent(KeyEvent event) {
  5. ...
  6. if (interceptMediaKey(event)) {
  7. return true;
  8. }
  9. return super.dispatchKeyEvent(event);
  10. }
  11. private boolean interceptMediaKey(KeyEvent event) {
  12. final int keyCode = event.getKeyCode();
  13. if (event.getAction() == KeyEvent.ACTION_DOWN) {
  14. switch (keyCode) {
  15. ...//more keyevent
  16. case KeyEvent.KEYCODE_VOLUME_UP:
  17. case KeyEvent.KEYCODE_VOLUME_DOWN: {
  18. ...
  19. // Don‘t execute default volume behavior
  20. return true; //直接返回不在向下传递处理
  21. }
  22. }
  23. }
  24. return false;
  25. }
  26. }
public abstract class KeyguardViewBase extends FrameLayout {
	 ...
  @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        ...
        if (interceptMediaKey(event)) {
            return true;
        }
        return super.dispatchKeyEvent(event);
    }

    private boolean interceptMediaKey(KeyEvent event) {
        final int keyCode = event.getKeyCode();
        if (event.getAction() == KeyEvent.ACTION_DOWN) {
            switch (keyCode) {
                ...//more keyevent
                case KeyEvent.KEYCODE_VOLUME_UP:
                case KeyEvent.KEYCODE_VOLUME_DOWN: {
                    ...
                    // Don‘t execute default volume behavior
                    return true; //直接返回不在向下传递处理
                }
            }
        } 
        return false;
    }
 }

9、 KeyguardViewProperties.java 接口

功能:提供了创建界面的通用方法。

  1. public interface KeyguardViewProperties {
  2. //创建一个KeyguardViewBase实例 , 实际是指LockPatternKeyguardView实例
  3. KeyguardViewBase createKeyguardView(Context context,
  4. KeyguardUpdateMonitor updateMonitor,
  5. KeyguardWindowController controller);
  6. boolean isSecure();
  7. }
public interface KeyguardViewProperties {  
	    //创建一个KeyguardViewBase实例 , 实际是指LockPatternKeyguardView实例
	    KeyguardViewBase createKeyguardView(Context context,
	            KeyguardUpdateMonitor updateMonitor,
	            KeyguardWindowController controller);

	    boolean isSecure();
	}

其唯一实现类是是LockPatternKeyguardViewProperties类(稍后讲到)。


10、LockPatternKeyguardViewProperties

源代码释义如下:

  1. public class LockPatternKeyguardViewProperties implements KeyguardViewProperties {
  2. ...
  3. //创建一个LockPatternKeyguardView对象
  4. public KeyguardViewBase createKeyguardView(Context context,
  5. KeyguardUpdateMonitor updateMonitor,
  6. KeyguardWindowController controller) {
  7. return new LockPatternKeyguardView(context, updateMonitor,
  8. mLockPatternUtils, controller);
  9. }
public class LockPatternKeyguardViewProperties implements KeyguardViewProperties {
    ...
    //创建一个LockPatternKeyguardView对象
    public KeyguardViewBase createKeyguardView(Context context,
            KeyguardUpdateMonitor updateMonitor,
            KeyguardWindowController controller) {
        return new LockPatternKeyguardView(context, updateMonitor,
                mLockPatternUtils, controller);
    }
}
//=============================================

// OK ,我知道你看的很纠结了,具体需要时参考源代码看是最明智的。

//=============================================


我知道代码贴的太多了,没办法,谁让它理解起来就那么费劲呢 ? 你可别犯愁,真正核心的类可还没出来。。


12、KeyguardViewMediator核心类 ,该类是唯一实现了KeyguardViewCallback的类。

功能: 功能:该类提供了一些接口,由PhoneWindowManager)去访问控制Keyguard....

该类的初始化是在PolicyWindowManager的构造函数中创建的。如下:

  1. public class PhoneWindowManager implements WindowManagerPolicy {
  2. ...
  3. /** {@inheritDoc} */ //由SystemServer调用
  4. public void init(Context context, IWindowManager windowManager,
  5. LocalPowerManager powerManager) {
  6. ...//初始化该实例
  7. mKeyguardMediator = new KeyguardViewMediator(context, this, powerManager);
  8. }
  9. }
public class PhoneWindowManager implements WindowManagerPolicy {
	   ...
	  /** {@inheritDoc} */  //由SystemServer调用
	  public void init(Context context, IWindowManager windowManager,
	          LocalPowerManager powerManager) {
	      ...//初始化该实例
	      mKeyguardMediator = new KeyguardViewMediator(context, this, powerManager);
	  }
  }

参照源代码,把一些重要的属性和方法的大意给分析下:

  1. public class KeyguardViewMediator implements KeyguardViewCallback, KeyguardUpdateMonitor.SimStateCallback {
  2. private boolean mSystemReady; //启动成功 由SystemServer调用
  3. /**Used to keep the device awake while to ensure the keyguard finishes opening before
  4. * we sleep.*/ //在需要显示锁屏界面时,保持屏幕在某个时间段内为暗屏状态
  5. private PowerManager.WakeLock mShowKeyguardWakeLock;
  6. private KeyguardViewManager mKeyguardViewManager; //KeyguardViewManager实例
  7. /** * External apps (like the phone app) can tell us to disable the keygaurd.*/
  8. //是否允许其他App禁止锁屏 , 例如来电时 禁止锁屏
  9. private boolean mExternallyEnabled = true;
  10. //处于锁屏状态 , 即显示锁屏
  11. private boolean mShowing = false;
  12. // true if the keyguard is hidden by another window
  13. private boolean mHidden = false; //被其他窗口掩盖 , 例如来电时锁屏被掩盖
  14. private boolean mScreenOn = false; // 是否亮屏
  15. public KeyguardViewMediator(Context context, PhoneWindowManager callback,
  16. LocalPowerManager powerManager) {
  17. ...
  18. //构造相关实例对象
  19. mKeyguardViewProperties = new LockPatternKeyguardViewProperties(
  20. new LockPatternUtils(mContext), mUpdateMonitor);
  21. mKeyguardViewManager = new KeyguardViewManager(
  22. context, WindowManagerImpl.getDefault(), this,
  23. mKeyguardViewProperties, mUpdateMonitor);
  24. //解锁成功后发送的Intent
  25. mUserPresentIntent = new Intent(Intent.ACTION_USER_PRESENT);
  26. mUserPresentIntent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
  27. }
  28. /** Called to let us know the screen was turned off.
  29. * @param why either {@link WindowManagerPolicy#OFF_BECAUSE_OF_USER},
  30. * {@link WindowManagerPolicy#OFF_BECAUSE_OF_TIMEOUT} or
  31. * {@link WindowManagerPolicy#OFF_BECAUSE_OF_PROX_SENSOR}.
  32. */
  33. //屏幕变灰暗 , 原因有如下:以及对应的逻辑处理。
  34. // 1、OFF_BECAUSE_OF_USER : 用户按下POWER键 , 当前是否处于锁屏界面,若是(mShowing)则重置显示界面,否则重新显示锁屏界面
  35. // 2、OFF_BECAUSE_OF_TIMEOUT : 屏幕超时,常见情况就是一段时间没有操作屏幕,手机处于灰暗状态。 处理行为:
  36. // 发送Action值为DELAYED_KEYGUARD_ACTION的广播,因为该类注册了该Intent广播,接受到时会调用doKeyguard()方法锁屏
  37. // 3、OFF_BECAUSE_OF_PROX_SENSOR:接打电话时,距离感应太近导致暗屏,此时由于PowerManager那儿已经处理了暗屏,不需要做任何事
  38. // 最后,如果以上逻辑都不成立,调用 doKeyguard()方法显示屏幕
  39. public void onScreenTurnedOff(int why) {
  40. ...
  41. }
  42. /**
  43. * Let‘s us know the screen was turned on.
  44. */
  45. public void onScreenTurnedOn() {
  46. synchronized (this) {
  47. ...
  48. notifyScreenOnLocked(); //通知亮屏
  49. }
  50. }
  51. /** Enable the keyguard if the settings are appropriate. */
  52. private void doKeyguard() {
  53. synchronized (this) {
  54. ...
  55. showLocked();//显示锁屏界面
  56. }
  57. }
  58. //该方法的调用时机就是当按下POWER键时,系统会回调该方法 keyCode值一般为 26
  59. public boolean onWakeKeyWhenKeyguardShowingTq(int keyCode) {
  60. //操作按键是否能唤醒屏幕
  61. if (isWakeKeyWhenKeyguardShowing(keyCode)) {
  62. // give the keyguard view manager a chance to adjust the state of the
  63. // keyguard based on the key that woke the device before poking
  64. // the wake lock
  65. wakeWhenReadyLocked(keyCode);//开始唤醒屏幕咯
  66. return true;
  67. } else {
  68. return false;
  69. }
  70. }
  71. /** {@inheritDoc} */ //在一定时间内保存屏幕为亮屏状态
  72. public void pokeWakelock(int holdMs) {
  73. ...
  74. }
  75. //表示成功得分完成了解锁操作
  76. public void keyguardDone(boolean authenticated, boolean wakeup) {
  77. synchronized (this) {
  78. //发送给Handler 进行异步处理
  79. Message msg = mHandler.obtainMessage(KEYGUARD_DONE);
  80. msg.arg1 = wakeup ? 1 : 0;
  81. mHandler.sendMessage(msg);
  82. if (authenticated) {
  83. mUpdateMonitor.clearFailedAttempts(); //清除错误登录次数
  84. }
  85. ...
  86. }
  87. }
  88. //Handler对象 , 异步处理
  89. private Handler mHandler = new Handler() {
  90. @Override
  91. public void handleMessage(Message msg) {
  92. switch (msg.what) {
  93. ... //异步处理
  94. }
  95. }
  96. };
  97. //异步处理完成开锁成功
  98. private void handleKeyguardDone(boolean wakeup) {
  99. handleHide(); //释放该Keyguard对应的窗口
  100. mWakeLock.release();
  101. mContext.sendBroadcast(mUserPresentIntent); //解锁成功,发送Intent信息
  102. }
  103. //显示锁屏界面
  104. private void handleShow() {
  105. synchronized (KeyguardViewMediator.this) {
  106. ...
  107. mKeyguardViewManager.show();
  108. mShowing = true;
  109. ...
  110. }
  111. }
  112. private void handleHide() {
  113. synchronized (KeyguardViewMediator.this) {
  114. //去除锁屏界面对应的窗口
  115. mKeyguardViewManager.hide();
  116. mShowing = false;
  117. ...
  118. }
  119. }
  120. //设置状态栏enable状态 , 例如:能否被下拉等
  121. private void adjustStatusBarLocked() {
  122. ...
  123. // if the keyguard is shown, allow the status bar to open
  124. // only if the keyguard is insecure and is covered by another window
  125. boolean enable = !mShowing || (mHidden && !isSecure());
  126. mStatusBarManager.disable(enable ?StatusBarManager.DISABLE_NONE : StatusBarManager.DISABLE_EXPAND);
  127. }
  128. }
  129. }
public class KeyguardViewMediator implements KeyguardViewCallback, KeyguardUpdateMonitor.SimStateCallback {
    private boolean mSystemReady;  //启动成功 由SystemServer调用

    /**Used to keep the device awake while to ensure the keyguard finishes opening before
     * we sleep.*/ //在需要显示锁屏界面时,保持屏幕在某个时间段内为暗屏状态  
    private PowerManager.WakeLock mShowKeyguardWakeLock;
    private KeyguardViewManager mKeyguardViewManager; //KeyguardViewManager实例
    /**  * External apps (like the phone app) can tell us to disable the keygaurd.*/
    //是否允许其他App禁止锁屏 , 例如来电时 禁止锁屏
    private boolean mExternallyEnabled = true;
    //处于锁屏状态 , 即显示锁屏
    private boolean mShowing = false;
    // true if the keyguard is hidden by another window
    private boolean mHidden = false; //被其他窗口掩盖 , 例如来电时锁屏被掩盖
    private boolean mScreenOn = false; // 是否亮屏

    public KeyguardViewMediator(Context context, PhoneWindowManager callback,
            LocalPowerManager powerManager) {
        ...
        //构造相关实例对象
        mKeyguardViewProperties = new LockPatternKeyguardViewProperties(
                new LockPatternUtils(mContext), mUpdateMonitor);

        mKeyguardViewManager = new KeyguardViewManager(
                context, WindowManagerImpl.getDefault(), this,
                mKeyguardViewProperties, mUpdateMonitor);
        //解锁成功后发送的Intent
        mUserPresentIntent = new Intent(Intent.ACTION_USER_PRESENT);
        mUserPresentIntent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
    }
    /** Called to let us know the screen was turned off.
     *   @param why either {@link WindowManagerPolicy#OFF_BECAUSE_OF_USER},
     *   {@link WindowManagerPolicy#OFF_BECAUSE_OF_TIMEOUT} or
     *   {@link WindowManagerPolicy#OFF_BECAUSE_OF_PROX_SENSOR}.
     */
    //屏幕变灰暗  , 原因有如下:以及对应的逻辑处理。
    // 1、OFF_BECAUSE_OF_USER : 用户按下POWER键 , 当前是否处于锁屏界面,若是(mShowing)则重置显示界面,否则重新显示锁屏界面
    // 2、OFF_BECAUSE_OF_TIMEOUT : 屏幕超时,常见情况就是一段时间没有操作屏幕,手机处于灰暗状态。          处理行为:   
    //     发送Action值为DELAYED_KEYGUARD_ACTION的广播,因为该类注册了该Intent广播,接受到时会调用doKeyguard()方法锁屏
    // 3、OFF_BECAUSE_OF_PROX_SENSOR:接打电话时,距离感应太近导致暗屏,此时由于PowerManager那儿已经处理了暗屏,不需要做任何事
    // 最后,如果以上逻辑都不成立,调用 doKeyguard()方法显示屏幕                       
    public void onScreenTurnedOff(int why) {
       ...
    }
    /**
     * Let‘s us know the screen was turned on.
     */
    public void onScreenTurnedOn() {
        synchronized (this) {
            ...
            notifyScreenOnLocked();  //通知亮屏
        }
    }
    /** Enable the keyguard if the settings are appropriate. */
    private void doKeyguard() {
        synchronized (this) {
            ...
            showLocked();//显示锁屏界面
        }
    }
    //该方法的调用时机就是当按下POWER键时,系统会回调该方法 keyCode值一般为 26
    public boolean onWakeKeyWhenKeyguardShowingTq(int keyCode) {
        //操作按键是否能唤醒屏幕 
        if (isWakeKeyWhenKeyguardShowing(keyCode)) {
            // give the keyguard view manager a chance to adjust the state of the
            // keyguard based on the key that woke the device before poking
            // the wake lock
            wakeWhenReadyLocked(keyCode);//开始唤醒屏幕咯
            return true;
        } else {
            return false;
        }
    }
    /** {@inheritDoc} */  //在一定时间内保存屏幕为亮屏状态
    public void pokeWakelock(int holdMs) {
        ...
    }
    //表示成功得分完成了解锁操作
    public void keyguardDone(boolean authenticated, boolean wakeup) {
        synchronized (this) {
            //发送给Handler 进行异步处理
            Message msg = mHandler.obtainMessage(KEYGUARD_DONE);
            msg.arg1 = wakeup ? 1 : 0;
            mHandler.sendMessage(msg);
            if (authenticated) {
                mUpdateMonitor.clearFailedAttempts(); //清除错误登录次数
            }
            ...
        }
    }
    //Handler对象 , 异步处理
    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
              ...  //异步处理
            }
        }
    };
    //异步处理完成开锁成功
    private void handleKeyguardDone(boolean wakeup) { 
        handleHide(); //释放该Keyguard对应的窗口
        mWakeLock.release();
        mContext.sendBroadcast(mUserPresentIntent); //解锁成功,发送Intent信息
    }
    //显示锁屏界面
    private void handleShow() {
        synchronized (KeyguardViewMediator.this) {
            ...
            mKeyguardViewManager.show();
            mShowing = true;
            ...
        }
    }
    private void handleHide() {
        synchronized (KeyguardViewMediator.this) {
            //去除锁屏界面对应的窗口
            mKeyguardViewManager.hide();
            mShowing = false;
           ...
        }
    }
    //设置状态栏enable状态 , 例如:能否被下拉等
    private void adjustStatusBarLocked() {
            ...
            // if the keyguard is shown, allow the status bar to open
            // only if the keyguard is insecure and is covered by another window
            boolean enable = !mShowing || (mHidden && !isSecure());
            mStatusBarManager.disable(enable ?StatusBarManager.DISABLE_NONE : StatusBarManager.DISABLE_EXPAND);
        }
    }
}

该类的很多方法都是由PhoneWindowManager调用访问的。


基本上把一些重要的类及其相关的方法给走了一遍吧,对看源码的还是很有帮助的。因为我的理解还不是很深入,可能有偏颇的

地方。希望以后能够组件完善起来。 阿门 !


问题:如何在框架中, 解除锁屏 ?


引入:该问题是在CSDN论坛上回答一位网友引发的,最开始由于我也只是简单看了下,因此也就事论事回答了一个小问题。

随着看的越来越深入,慢慢的也在心里长生了涟漪。经过尝试、烧鸡验证,发现如下办法行的通,而且效果还比较好。风险应该

比较小吧。 希望正在在框架修改的同学,慎重行事。


基本思路:毫无疑问,我的想法就是每次需要显示Keyguard---锁屏界面时,我们并不真正的去锁屏,而只是提供了一个空的

方法去给系统调用,让系统觉得我们“锁屏”了,同样也不去真正的隐藏“锁屏”界面,提供一个空壳给系统调用。由于可能涉及

到其它问题,例如:能否下拉状态栏,按下POWER键后,屏幕很快休眠等。Come on ,我们需要统一做处理。


所有步骤函数都发生在KeyguardViewMediator 类中,注释部分为我们所添加的。


Step 1、 取消 真正的去锁屏实现

  1. //该方法会显示锁屏界面,我们使其成为一个空壳子
  2. private void handleShow() {
  3. synchronized (KeyguardViewMediator.this) {
  4. if (DEBUG) Log.d(TAG, "handleShow");
  5. if (!mSystemReady) return;
  6. playSounds(true);
  7. //Begin : Modifid by qinjuning
  8. //mKeyguardViewManager.show(); //
  9. //mShowing = true; //
  10. //adjustUserActivityLocked(); //
  11. //adjustStatusBarLocked(); //取消对状态栏的控制
  12. //End
  13. try {
  14. ActivityManagerNative.getDefault().closeSystemDialogs("lock");
  15. } catch (RemoteException e) {
  16. }
  17. mShowKeyguardWakeLock.release();
  18. }
  19. }
//该方法会显示锁屏界面,我们使其成为一个空壳子
private void handleShow() {
    synchronized (KeyguardViewMediator.this) {
        if (DEBUG) Log.d(TAG, "handleShow");
        if (!mSystemReady) return;

        playSounds(true);
        //Begin : Modifid by qinjuning     
        
        //mKeyguardViewManager.show();  //   
        //mShowing = true;              //
        //adjustUserActivityLocked();   //
        //adjustStatusBarLocked();     //取消对状态栏的控制
        
        //End
        try {
            ActivityManagerNative.getDefault().closeSystemDialogs("lock");
        } catch (RemoteException e) {
        }
        mShowKeyguardWakeLock.release();
    }
}

Step 2、 取消 真正的去隐藏锁屏实现

  1. //真正的隐藏屏幕实现
  2. private void handleHide() {
  3. synchronized (KeyguardViewMediator.this) {
  4. if (DEBUG) Log.d(TAG, "handleHide");
  5. if (mWakeAndHandOff.isHeld()) {
  6. Log.w(TAG, "attempt to hide the keyguard while waking, ignored");
  7. return;
  8. }
  9. // only play "unlock" noises if not on a call (since the incall UI
  10. // disables the keyguard)
  11. if (TelephonyManager.EXTRA_STATE_IDLE.equals(mPhoneState)) {
  12. playSounds(false);
  13. }
  14. //Begin : Modifid by qinjuning
  15. //mKeyguardViewManager.hide();
  16. //mShowing = false;
  17. //adjustUserActivityLocked();
  18. //adjustStatusBarLocked(); //取消对状态栏的控制
  19. //End
  20. }
  21. }
//真正的隐藏屏幕实现
private void handleHide() {
    synchronized (KeyguardViewMediator.this) {
        if (DEBUG) Log.d(TAG, "handleHide");
        if (mWakeAndHandOff.isHeld()) {
            Log.w(TAG, "attempt to hide the keyguard while waking, ignored");
            return;
        }
        // only play "unlock" noises if not on a call (since the incall UI
        // disables the keyguard)
        if (TelephonyManager.EXTRA_STATE_IDLE.equals(mPhoneState)) {
            playSounds(false);
        }
        //Begin : Modifid by qinjuning  
        
        //mKeyguardViewManager.hide();
        //mShowing = false; 
        //adjustUserActivityLocked();       
        //adjustStatusBarLocked();         //取消对状态栏的控制
        
        //End
    }
}

以上两步行动后,存在一个Bug(问题),就是唤醒屏幕后,会在指定的时间内屏幕由亮变暗,我们还需要做如下修改

Step 3、按下POWER键时, 解除屏幕由亮变暗的Bug

  1. private void handleWakeWhenReady(int keyCode) {
  2. synchronized (KeyguardViewMediator.this) {
  3. if (DBG_WAKE) Log.d(TAG, "handleWakeWhenReady(" + keyCode + ")");
  4. // this should result in a call to ‘poke wakelock‘ which will set a timeout
  5. // on releasing the wakelock
  6. if (!mKeyguardViewManager.wakeWhenReadyTq(keyCode)) {
  7. // poke wakelock ourselves if keyguard is no longer active
  8. Log.w(TAG, "mKeyguardViewManager.wakeWhenReadyTq did not poke wake lock, so poke it ourselves");
  9. //Begin : Modifid by qinjuning
  10. //pokeWakelock(); //按下POWER键时, 解除屏幕由亮变暗的Bug
  11. //End
  12. }
  13. /**
  14. * Now that the keyguard is ready and has poked the wake lock, we can
  15. * release the handoff wakelock
  16. */
  17. mWakeAndHandOff.release();
  18. if (!mWakeLock.isHeld()) {
  19. Log.w(TAG, "mWakeLock not held in mKeyguardViewManager.wakeWhenReadyTq");
  20. }
  21. }
  22. }
private void handleWakeWhenReady(int keyCode) {
    synchronized (KeyguardViewMediator.this) {
        if (DBG_WAKE) Log.d(TAG, "handleWakeWhenReady(" + keyCode + ")");

        // this should result in a call to ‘poke wakelock‘ which will set a timeout
        // on releasing the wakelock
        if (!mKeyguardViewManager.wakeWhenReadyTq(keyCode)) {
            // poke wakelock ourselves if keyguard is no longer active
            Log.w(TAG, "mKeyguardViewManager.wakeWhenReadyTq did not poke wake lock, so poke it ourselves");
            //Begin : Modifid by qinjuning  
            //pokeWakelock();  //按下POWER键时, 解除屏幕由亮变暗的Bug   
            //End
        }
        /**
         * Now that the keyguard is ready and has poked the wake lock, we can
         * release the handoff wakelock
         */
        mWakeAndHandOff.release();

        if (!mWakeLock.isHeld()) {
            Log.w(TAG, "mWakeLock not held in mKeyguardViewManager.wakeWhenReadyTq");
        }
    }
}

经过真机测试是通过的,但其他风险并不清楚。 这个方法只是提供了一个学习的途径吧。大家慎重行事。

上面Step 1、以及Step 2可以由如下方法代替:

将属性mExternallyEnabled 设置为 false, 接下来需要显示界面时都不会继续走下去,如下函数:

  1. /**
  2. * Enable the keyguard if the settings are appropriate.
  3. */ //显示界面
  4. private void doKeyguard() {
  5. synchronized (this) {
  6. // if another app is disabling us, don‘t show
  7. if (!mExternallyEnabled) { //mExternallyEnabled 为false
  8. if (DEBUG) Log.d(TAG, "doKeyguard: not showing because externally disabled");
  9. // note: we *should* set mNeedToReshowWhenReenabled=true here, but that makes
  10. // for an occasional ugly flicker in this situation:
  11. // 1) receive a call with the screen on (no keyguard) or make a call
  12. // 2) screen times out
  13. // 3) user hits key to turn screen back on
  14. // instead, we reenable the keyguard when we know the screen is off and the call
  15. // ends (see the broadcast receiver below)
  16. // TODO: clean this up when we have better support at the window manager level
  17. // for apps that wish to be on top of the keyguard
  18. return;
  19. }
  20. ...
  21. }
  22. }
/**
 * Enable the keyguard if the settings are appropriate.
 */  //显示界面
private void doKeyguard() {
    synchronized (this) {
        // if another app is disabling us, don‘t show
        if (!mExternallyEnabled) {   //mExternallyEnabled 为false 
            if (DEBUG) Log.d(TAG, "doKeyguard: not showing because externally disabled");

            // note: we *should* set mNeedToReshowWhenReenabled=true here, but that makes
            // for an occasional ugly flicker in this situation:
            // 1) receive a call with the screen on (no keyguard) or make a call
            // 2) screen times out
            // 3) user hits key to turn screen back on
            // instead, we reenable the keyguard when we know the screen is off and the call
            // ends (see the broadcast receiver below)
            // TODO: clean this up when we have better support at the window manager level
            // for apps that wish to be on top of the keyguard
            return;
        }
        ...
    }
}

该方法的一个缺点就是,假如存在重新调用了setKeyguardEnabled()设置该值,一切都是白搭( 但从源码看,这点不可能

现,因为存在另一个判断依据:变量mNeedToReshowWhenReenabled , 其初始值为false,只有成功禁止锁屏之后才置为

true )。 此,我们可以仿照这个方法,主动添加一个私有变量,禁止显示锁屏界面,即禁止doKeyguard()方法继续走下去。

OK ,本文到此为止。讲的比较抽象。 大家看代码时多加理解才是王道 。

显然易见,手机厂商,基于框架只需要修改LockScreen这个自定义ViewGroup即可,其他的一套Google已经为我们

封装好了。


在框架层修改肯定不是最好的,对于第三方的App而言,实现不了该功能。还好,SDK为我们提供了接口类去处理隐藏锁屏接口

的方法,该类是KeyguardManager类,关于该类的简介请参考该博客:

KeyguardManager简介


我们可以通过KeyguardManager类实例获得一个KeyguardManager.KeyguardLock对象,进而调用相应方法去取消锁屏界面

示锁屏界面。

KeyguardManager.KeyguardLock的两个方法说明如下:


public void disableKeyguard ()

功能:取消锁屏界面显示,同时禁止显示锁屏界面。除非你显示调用了reenableKeyguard()方法使能显示锁屏界面。

public void reenableKeyguard ()

功能: 使能显示锁屏界面,如果你之前调用了disableKeyguard()方法取消锁屏界面,那么会马上显示锁屏界面。


这两个方法最终都会调用到KeyguardViewMediator类的setKeyguardEnabled(boolean enable)方法。

参数说明: enable = false 对应于disableKeyguard()方法,

enable = true 对应于reenableKeyguard()方法。

该方法原型为: 位于KeyguardViewMediator类中

  1. /**
  2. * Same semantics as {@link WindowManagerPolicy#enableKeyguard}; provide
  3. * a way for external stuff to override normal keyguard behavior. For instance
  4. * the phone app disables the keyguard when it receives incoming calls.
  5. */
  6. public void setKeyguardEnabled(boolean enabled) {
  7. synchronized (this) {
  8. mExternallyEnabled = enabled; //保存值,该值会在doKeyguard()时用到,如果为false ,则不进行锁屏
  9. if (!enabled && mShowing) {
  10. if (mExitSecureCallback != null) {//该判断为false
  11. ...
  12. return ;
  13. }
  14. mNeedToReshowWhenReenabled = true; //置为真,以便下次调用
  15. hideLocked(); //已经显示了锁屏界面,则取消隐藏界面
  16. } else if (enabled && mNeedToReshowWhenReenabled) { //重新显示锁屏界面
  17. mNeedToReshowWhenReenabled = false;
  18. if (mExitSecureCallback != null) {//该判断为false
  19. } else {
  20. showLocked(); //显示隐藏界面
  21. ...
  22. }
  23. }
  24. }
  25. }
/**
 * Same semantics as {@link WindowManagerPolicy#enableKeyguard}; provide
 * a way for external stuff to override normal keyguard behavior.  For instance
 * the phone app disables the keyguard when it receives incoming calls.
 */ 
public void setKeyguardEnabled(boolean enabled) {
    synchronized (this) {
        mExternallyEnabled = enabled;  //保存值,该值会在doKeyguard()时用到,如果为false ,则不进行锁屏

        if (!enabled && mShowing) {
            if (mExitSecureCallback != null) {//该判断为false
                ... 
                return ;
            }
            mNeedToReshowWhenReenabled = true;  //置为真,以便下次调用
            hideLocked(); //已经显示了锁屏界面,则取消隐藏界面
        } else if (enabled && mNeedToReshowWhenReenabled) { //重新显示锁屏界面
            mNeedToReshowWhenReenabled = false;

            if (mExitSecureCallback != null) {//该判断为false
              
            } else {
                showLocked(); //显示隐藏界面
                ...
            }
        }
    }
}


使用这两个方法时,记得加上如下权限android.permission.DISABLE_KEYGUARD


为了在亮屏时,达到取消显示界面的效果,我们还需要知道 一下两个广播:

屏幕变暗以及屏幕点亮的广播


android.intent.action.SCREEN_ON --- 屏幕变亮

android.intent.action.SCREEN_OFF ---- 屏幕点暗


关于这两个广播的说明请参考如下博客:http://www.2cto.com/kf/201111/109815.html

于是在监听到屏幕变暗/变亮时,通过KeyguardManager 类实现即可。对与用户而言,就相当于解除了锁屏界面了。

可能代码如下:

  1. //屏幕变暗/变亮的广播 , 我们要调用KeyguardManager类相应方法去解除屏幕锁定
  2. private BroadcastReceiver mScreenOffReceiver = new BroadcastReceiver(){
  3. @Override
  4. public void onReceive(Context context , Intent intent) {
  5. String action = intent.getAction() ;
  6. Log.i(TAG, intent.toString());
  7. if(action.equals("android.intent.action.SCREEN_OFF")
  8. || action.equals("android.intent.action.SCREEN_ON") ){
  9. mKeyguardManager = (KeyguardManager)context.getSystemService(Context.KEYGUARD_SERVICE);
  10. mKeyguardLock = mKeyguardManager.newKeyguardLock("zdLock 1");
  11. mKeyguardLock.disableKeyguard();
  12. startActivity(zdLockIntent);
  13. }
  14. }
  15. };
//屏幕变暗/变亮的广播 , 我们要调用KeyguardManager类相应方法去解除屏幕锁定
	private BroadcastReceiver mScreenOffReceiver = new BroadcastReceiver(){
		@Override
		public void onReceive(Context context , Intent intent) {
			String action = intent.getAction() ;
			
		    Log.i(TAG, intent.toString());
		    
			if(action.equals("android.intent.action.SCREEN_OFF")
					|| action.equals("android.intent.action.SCREEN_ON") ){
				mKeyguardManager = (KeyguardManager)context.getSystemService(Context.KEYGUARD_SERVICE);
				mKeyguardLock = mKeyguardManager.newKeyguardLock("zdLock 1"); 
				mKeyguardLock.disableKeyguard();
				startActivity(zdLockIntent);
			}
		}
		
	};


关于参考/设计一个好的解锁界面以及仿正点闹钟滑动解锁,请看我的这篇博客:

Android自定义锁屏实现----仿正点闹钟滑屏解锁

PS:如果觉得本文对你有帮助,请给顶一下。

最后,可能有些同学在做App时,可能想获取系统的登录次数等,例如:登录失败次数等 ; Android系统已经 为我们提供好

了框架去处理,具体对应类是DevicePolicyManager类,关于该类的具体使用请参见该博客:

【Android设备管理】 利用DevicePolicyManager执行屏幕锁定 》 。


我也不再罗嗦了 ,大家认真学习吧 。 后面我会仔细分析下锁屏框架的一些具体处理函数 。


Android框架浅析之锁屏(Keyguard)机制原理

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原文地址:http://my.oschina.net/yuanxulong/blog/323173

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