从service弹出系统级自定义提示框，可在任意页面弹出

添加权限

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

// 显示系统级提示框（自定义布局）

private void showNoticeDialog(String titil, final String text) {
    LayoutInflater inflaterDl = LayoutInflater.from(MyApplication.getContext());
    RelativeLayout layout = (RelativeLayout) inflaterDl.inflate(R.layout.layout_dialog_red_pack, null);
    final Dialog builder = new AlertDialog.Builder(this).create();
    builder.setCanceledOnTouchOutside(false);
    builder.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);//关键句
    builder.show();
    builder.getWindow().setContentView(layout);
    final TextView textView = (TextView) layout.findViewById(R.id.red_tv_text);
    textView.setText(titil);
    final ImageView img = (ImageView) layout.findViewById(R.id.red_iv_img);
    img.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
        }
    });
}