文章标题

toast 不只是在底部：

Toast toast = Toast.makeText(getApplicationContext(), "资料都不填完整，怎么加入群聊......",
Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
LinearLayout toastView = (LinearLayout) toast.getView();
ImageView imageCodeProject = new ImageView(getApplicationContext());
imageCodeProject.setImageResource(R.drawable.ic_launcer);
toastView.addView(imageCodeProject, 0);
toast.show();

#二进制相与
0+0=0，0+1=0，1+1=1