AlertDialog.Builder builder = new Builder(mContext);              builder.setTitle("更新进度");                    final LayoutInflater inflater = LayoutInflater.from(mContext);              View v = inflater.inflate(R.layout.progress, null);              mProgress = (ProgressBar) v.findViewById(R.id.progress);                    builder.setView(v);//此处设置自定义布局                    downloadDialog = builder.create();                    downloadDialog.show();                    downloadDialog.getWindow().setLayout(300, 200);//此处设置位置窗体大小

 注意设置位置需要在dialog调用show()方法以后，要不然没有效果i改变

另外dialog也可以设置窗体位置 具体代码为

menuDialog = new AlertDialog.Builder(this).create();                  Window mWindow = menuDialog.getWindow();                     WindowManager.LayoutParams lp = mWindow.getAttributes();                     lp.x = 10;   //新位置X坐标                        lp.y = 120; //新位置Y坐标     menuDialog.onWindowAttributesChanged(lp);    menuDialog.show();