Android6.0以上自定义Toast出现的问题

和上篇一样，设备新换成Android9版本以后出现的问题

android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@45f48c40 is not valid; is your activity running?

在自定义里面type改成

params.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;

之后又出现了

android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@47dd171 -- permission denied for window type 2038

这个是由于没有给到设置在其他应用上层显示的权限，

    public void checkPermission() {
        if (Build.VERSION.SDK_INT >= 23) {
            if (!Settings.canDrawOverlays(MinimalistModeActivity.this)) {
                Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                        Uri.parse("package:" + getPackageName()));
                startActivityForResult(intent, 10);
            }
        }
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == 10) {
            if (Build.VERSION.SDK_INT >= 23) {
                if (!Settings.canDrawOverlays(this)) {
                    // SYSTEM_ALERT_WINDOW permission not granted...
                    Toast.makeText(MinimalistModeActivity.this, "not granted", Toast.LENGTH_SHORT).show();
                }
            }
        }
    }

加上，ok