Android：Toast简单消息提示框

//参数1：当前的上下文环境。this或getApplicationContext()
//参数2：提示内容
//参数3：显示的时间长短
Toast toast = Toast.makeText(this, "默认的toast", Toast.LENGTH_LONG);
toast.show();

Toast toast = Toast.makeText(this, "自定义位置的toast", Toast.LENGTH_LONG);
//设置Toast显示位置(Gravity常量；X轴偏移量；Y轴偏移量。) 正右负左
//toast.setGravity(gravity, xOffset, yOffset);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();