android 悬浮窗口 权限 （ACTION_MANAGE_OVERLAY_PERMISSION）

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在开发悬浮球app的过程中，当第一次打开肯定会遇到权限问题

Caused by: android.view.WindowManager$BadTokenException: Unable to add window 
           android.view.ViewRootImpl$W@2886501 -- permission denied for window type 2007
  at android.view.ViewRootImpl.setView(ViewRootImpl.java:703)
  at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:342)
  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93)
  at com.pinecone.d2dinfofloatball.FloatBallManager.addBallView(FloatBallManager.java:88)

2007 代表 允许出现在其他应用上 ，所以需要将其打开

然后再次打开就,windowmanager 绘制 悬浮窗口的时候就没问题

其原理,检查app的uid

mOverlayState = 
mOverlayBridge.getOverlayInfo(mPackageName,mPackageInfo.applicationInfo.uid);

而在开机的时候PMS 会添加默认开机不检查的进程

        mSettings.addSharedUserLPw("android.uid.system", Process.SYSTEM_UID,
                ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);
        mSettings.addSharedUserLPw("android.uid.phone", RADIO_UID,
                ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);
        mSettings.addSharedUserLPw("android.uid.log", LOG_UID,
                ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);
        mSettings.addSharedUserLPw("android.uid.nfc", NFC_UID,
                ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);
        mSettings.addSharedUserLPw("android.uid.bluetooth", BLUETOOTH_UID,
                ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);
        mSettings.addSharedUserLPw("android.uid.shell", SHELL_UID,
                ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);

其他的permission 是需要在manifest中配置

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

因为在绘制时候添加顶层view 布局

mFBParams.type = LayoutParams.TYPE_SYSTEM_ALERT | LayoutParams.TYPE_SYSTEM_OVERLAY;//顶层的View ,就要用这两个type