上滑解锁流程分析

 

1、用户手指touch屏幕，产生touch down事件，最底层view StatusBarWindowView会执行onInterceptTouchEvent，看是否需要拦截touch事件，touch down事件在此没有被拦截，再一级级往子View传递，都没有被拦截，之后执行OnTouchEvent，从子View开始往父View传递，一级级往父View传递，也都没有消耗touch down事件；
2、用户移动手指，产生touch move事件，最底层view StatusBarWindowView会执行onInterceptTouchEvent，看是否需要拦截touch事件，touch move事件在此也没有被拦截，再一级级往子View传递，都没有被拦截，之后执行OnTouchEvent，从子View开始往父View传递，一级级往父View传递，到PanelView这里当手指移动的距离达到一定的阈值会调用onTrackingStarted从而设置mTracking的值为true，接收此touch move事件，之后的touch事件直接传到此View。在用户滑动过程会调用setExpandedHeightInternal,进而调用NotificationPanelView的onHeightUpdated进行锁屏上的时间和通知View根据手指的移动距离进行缩小、变透明处理；
3、用户抬起手指，产生touch up事件，PanelView接收到这个事件后会调用endMotionEvent，如果手指从down到up之间移动的距离达到一定阈值会调用onTrackingStopped，从而调出解锁界面；
代码分析如下：
 

endMotionEvent调出解锁界面流程如下：
->PanelView.endMotionEvent(MotionEvent event, float x, float y, boolean forceCancel)
->NotificationPanelView.onTrackingStopped(boolean expand)
->PhoneStatusBar.onTrackingStopped(boolean expand)
->PhoneStatusBar.showBouncer()
->StatusBarKeyguardViewManager.dismiss()
->StatusBarKeyguardViewManager.dismiss(boolean authenticated)
->StatusBarKeyguardViewManager.showBouncer(boolean authenticated)
->KeyguardBouncer.show(boolean resetSecuritySelection, boolean authenticated）
->KeyguardBouncer.mShowRunnable
调用KeyguardBouncer.show(boolean resetSecuritySelection, boolean authenticated）方法并没有重新加载解锁界面，解锁界面是在灭屏时调用StatusBarKeyguardViewManager.reset后重新inflate进来的，在此处只是通过KeyguardBouncer.mShowRunnable将这个解锁界面显示出来，灭屏时解锁界面的调用栈如下：
“main@52911” prio=5 tid=0x1 nid=NA runnable
java.lang.Thread.State: RUNNABLE
at com.android.keyguard.KeyguardSecurityContainer.showSecurityScreen(KeyguardSecurityContainer.java:584)
at com.android.keyguard.KeyguardSecurityContainer.showPrimarySecurityScreen(KeyguardSecurityContainer.java:416)
at com.android.keyguard.KeyguardHostView.onFinishInflate(KeyguardHostView.java:168)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:867)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:994)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:854)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
- locked <0xd005> (a java.lang.Object[])
at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
at com.android.systemui.statusbar.phone.KeyguardBouncer.inflateView(KeyguardBouncer.java:317)
at com.android.systemui.statusbar.phone.KeyguardBouncer.ensureView(KeyguardBouncer.java:307)
at com.android.systemui.statusbar.phone.KeyguardBouncer.needsFullscreenBouncer(KeyguardBouncer.java:347)
at com.android.systemui.statusbar.phone.StatusBarKeyguardViewManager.showBouncerOrKeyguard(StatusBarKeyguardViewManager.java:130)
at com.android.systemui.statusbar.phone.StatusBarKeyguardViewManager.reset(StatusBarKeyguardViewManager.java:192)

至此把用户设定的解锁界面（图案、密码、PIN码）显示出来