android手持打印机示例源码

关于AccessibilityService 先看看官网的介绍Accessibility Many Android users have different abilities that require them to interact with their Android devices in different ways. These include users who have visual, physical or age-related limitations that prevent them from fully seeing or using a touchscreen, and users with hearing loss who may not be able to perceive audible information and alerts... Android官网详解accessibility 上面大概的意思就是Accessibility是一个辅助服务，主要是面向一些使用Android手机的用户有相关障碍(年龄、视觉、听力、身体等)，这个功能可以更容

仿开心网  android程序本资源的主要作用用于让初学android的朋友比较容易上手android开发，功能包括一些界面设计，service，消息传递等等，基本上囊括了android基本开发的知识点。

实现蓝牙连接传输数据： 1 使用registerReceiver注册BroadcastReceiver来获取蓝牙状态、搜索设备等消息； 2 使用BlueAdatper的搜索； 3 在BroadcastReceiver的onReceive()里取得搜索所得的蓝牙设备信息(如名称，MAC，RSSI)； 4 在BroadcastReceiver的onReceive()里取得搜索所得的蓝牙设备信息(如名称，MAC，RSSI)；3 在BroadcastReceiver的onReceive()里取得搜索所得的蓝牙设备信息(如名称，MAC，RSSI)； 5 由BluetoothDevice衍生出BluetoothSocket，准备SOCKET来读写设备； 6 通过BluetoothSocket的createRfcommSocketToServiceRecord()方法来选择连接的协议/服务，这里用的是SPP(UUID:00001101-0000-1000-8000-00805F9B34FB)； 7 Connect之后(如果还没配对则系统自动提示)，使用BluetoothSocket的getInputStream()和getOutputStream()来读写蓝牙设备。

android 省市区三级联动效果

目前健康标准越来越重要，这里上传一个关于体重推导出的健康标准，让我们随时随刻可以评估我们健康情况

查询公交线路，站点信息，实现用户登陆，注册，管理员登陆，修改用户信息等

android滚动论，可自定义，实现滚动选择

一个安卓应用练习 扫描书籍isbn 使用豆瓣图书api获取书籍信息 使用zxing库

android 省市区三级联动

【核心代码】 public interface CameraSource {  static final String LOG_TAG = "camera";  /**  * Open the camera source for subsequent use via calls to capture().  *   * @return true if the camera source was successfully opened.  */  boolean open();  /**  * Close the camera source. Calling close on a closed CameraSource is  * permitted but has no effect. The camera source may be reopened after  * being closed.  */  void close();  /**  * The width of the captured image.  *   * @return the width of the capture in pixels  */  int getWidth();  /**  * The height of the captured image.  *   * @return the height of the capture in pixels  */  int getHeight();  /**  * Attempts to render the current camera view onto the supplied canvas.  * The capture will be rendered into the rectangle (0,0,width,height).  * Outstanding transformations on the canvas may alter this.  *   * @param canvas the canvas to which the captured pixel data will be written  * @return true iff a frame was successfully written to the canvas  */  boolean capture(Canvas canvas);  boolean saveImage(String savePath, String fileName); }