Android错误之(Android 6.0)Unable to add window android.view.ViewRootImpl$W@d4521e8 -- permission denied

错误全log信息如下：

08-14 12:54:17.073 6411-6411/? E/AndroidRuntime: FATAL EXCEPTION: main
                                                 Process: com.example.administrator.myapplication, PID: 6411
                                                 android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@d4521e8 -- permission denied for this window type
                                                     at android.view.ViewRootImpl.setView(ViewRootImpl.java:591)
                                                     at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:310)
                                                     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)
                                                     at com.example.administrator.myapplication.FloatView.show(FloatView.java:78)
                                                     at com.example.administrator.myapplication.MainActivity.onClick(MainActivity.java:35)
                                                     at android.view.View.performClick(View.java:5198)
                                                     at android.view.View$PerformClick.run(View.java:21147)
                                                     at android.os.Handler.handleCallback(Handler.java:739)
                                                     at android.os.Handler.dispatchMessage(Handler.java:95)
                                                     at android.os.Looper.loop(Looper.java:148)
                                                     at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

回看AndroidMainifest.xml时添加了如下权限了额：

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

其实android6.0添加了运行时权限，因此我们在使用弹出框的地方加入如下代码：

    public void permission(){
        if (Build.VERSION.SDK_INT >= 23) {
            if(!Settings.canDrawOverlays(this)) {
                Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
                startActivity(intent);
                return;
            } else {
                //Android6.0以上
                if (mFloatView!=null && mFloatView.isShow()==false) {
                    mFloatView.show();
                }
            }
        } else {
            //Android6.0以下，不用动态声明权限
            if (mFloatView!=null && mFloatView.isShow()==false) {
                mFloatView.show();
            }
        }
    }
}

这时需要权限时会先弹到权限申请页面。