添加屏保解锁功能

[size=x-large]1. 系统设置，执行LockPatternUtils　save密码等屏保参数
２．framework/core/packages/SystemUI com.android.systemui.keyguard  这个类总的处理那个屏幕显示的逻辑
３．存储屏保的代码在framework/core/packages/Keyguard　　这个app里面定义了各种UI,根据之前保存的屏保类型，来加载







    private void showBouncerOrKeyguard() { 
        if (DEBUG) Log.d(TAG, "showBouncerOrKeyguard() is called.") ; 
     
        if (mBouncer.needsFullscreenBouncer()) { 
            if (DEBUG) { 
                Log.d(TAG, "needsFullscreenBouncer() is true, show \"Bouncer\" view directly."); 
            } 
            // The keyguard might be showing (already). So we need to hide it. 
            mPhoneStatusBar.hideKeyguard();//需要使用Bouncer隐藏keyguard 
            mBouncer.show(true /* resetSecuritySelection */);//显示Bouncer 
        } else { 
            if (DEBUG) { 
                Log.d(TAG, "needsFullscreenBouncer() is false," 
                    + "show \"Notification Keyguard\" view."); 
            } 
            mPhoneStatusBar.showKeyguard();//滑屏解锁 
            mBouncer.hide(false /* destroyView */); 
            mBouncer.prepare(); 
        } 
    } 



显示流程－》showSecurityScreen－》getSecurityView－》getSecurityViewIdForMode－》







1.SecuritySettings->获取安全模式布局文件（getResIdForLockUnlockScreen）,如果没有设置任何密码则加载security_settings_chooser　，如果是已经设置了密码锁则加载security_settings_password

2.onPreferenceTreeClick 触发进去的设置部分，进入com.android.settings.ChooseLockGeneric$ChooseLockGenericFragment

3.ChooseLockGenericFragment  没有设置密码,则直接加载security_settings_picker选择任意加密方式，如果已经设置了密码，那么进入ConfirmLockPassword，确认输入后，再回来，如果没有设置过密码，如选择密码方式，那么跳转ChooseLockPassword　输入密码，保存到系统



#####system ui and keyguard unlock prograss############################

password unlock----->

KeyguardPasswordView->onEditorAction()->verifyPasswordAndUnlock()->

KeyguardSecurityContainer
KeyguardSecurityContainer->KeyguardSecurityCallback mCallback ->reportUnlockAttempt,
mSecurityCallback.dismiss(authenticated); ->mCallback->

SecurityCallback->dismiss(authenticated);


KeyguardViewBase->public boolean dismiss(boolean authenticated)

KeyguardSecurityContainer->showNextSecurityScreenOrFinish

KeyguardViewBase->mViewMediatorCallback.updateNavbarStatus() ;


mViewMediatorCallback.keyguardDone(true);  mViewMediatorCallback.updateNavbarStatus

-->system ui  --->
ViewMediatorCallback mViewMediatorCallback
keyguardDone(authenticated, true);    updateNavbarStatus() ;





PhoneStatusBar->KeyguardViewMediator mKeyguardViewMediatorCallback 这是交互的关键所在keyguard和system ui的交互

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