当没有网络时候设置一个窗体

if (!isNetworker) {
ImageView imageView =new ImageView(mContext);
Bitmap bitmap =android.graphics.BitmapFactory.decodeResource(getResources(),R.drawable.blue)
imageView.setImageBitmap(bitmap);
WindowManager.LayoutParams ll = new WindowManager.LayoutParams();
ll.width = WindowManager.LayoutParams.MATCH_PARENT;
ll.height = WindowManager.LayoutParams.MATCH_PARENT;
setContentView(imageView,ll);
}