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android开发BadTokenException: Unable to add window --

BadTokenException: Unable to add window -- token null is not valid; is your activity running?比较好的解决方法

  1. 具体崩溃信息:
  2. android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running? at android.view.ViewRootImpl.setView(ViewRootImpl.java:1165)

  3. 崩溃原因是:
  4. 调用了popupWindow.showAtLocation,比如popupWindow.showAtLocation(anchorView,Gravity.TOP,0,0),

    而如果这个anchorView还没有添加到Activity,或者Activity刚好关闭了,比如刚好手机来电话了等等都会偶尔受影响,

    此时调用popupWindow.showAtLocation方法就会出现BadTokenException异常,因为anchorView的windowToken为空。

    说白了崩溃原因就是因为anchorView的windowToken为空。

    复现案例:在Activity的onCreate方法里调用popupWindow.showAtLocation就会出现。。。

  5. 比较好的解决方法
private fun showPopWindow(anchorView: View) {
val popupWindow = PopupWindow(this)
popupWindow.contentView =...
if (anchorView.windowToken != null){//判断一下如果windowToken不为空才显示,不然延迟200ms再试试
popupWindow.showAtLocation(anchorView,Gravity.TOP,0,0)
}else{
Handler(Looper.getMainLooper()).postDelayed({
if (anchorView.windowToken != null){//延迟200ms后再判断保证windowToken不为空才显示
popupWindow.showAtLocation(anchorView,Gravity.TOP,0,0)
}
},200)
}
}




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