记录个错误This window was lost，Rebuild removed 9 windows but added 8

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错误如下

09-13 17:25:35.895 957-970/? W/WindowManager: Rebuild removed 9 windows but added 8
    java.lang.RuntimeException: here
        at com.android.server.wm.WindowManagerService.rebuildAppWindowListLocked(WindowManagerService.java:8129)
        at com.android.server.wm.WindowManagerService.rebuildAppWindowListLocked(WindowManagerService.java:8065)

09-13 17:25:35.905 957-970/? W/WindowManager: This window was lost: Window{4363d0c0 u0 包名/具体Activity}
    mDisplayId=0 mSession=Session{43456588 27252:u0a10304} mClient=android.os.BinderProxy@434c6558
    mOwnerUid=10304 mShowToOwnerOnly=true package=com.md.personnelfiles appop=NONE
    mAttrs=WM.LayoutParams{(0,0)(fillxfill) sim=#110 ty=1 fl=#4810100 extfl=#0 pfl=0x8 wanim=0x10302a1 vsysui=0x500}
    Requested w=720 h=1280 mLayoutSeq=2812

产生原因

在执行tv_tjx点击事件后，没加break，继续执行back（）方法，该方法是跳转activity，于是产生错误，代码如下，加上break后，错误消失。

case R.id.tv_tjx:
    ed_worknotec.setTextSize(22);
case R.id.tv_noteback:
    back();
    break;
default:
    break;

后记，糊里糊涂解决了，没明白原理，留着有时间再继续研究。