[android] 06_我的照相机

Android 4.0

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我的照相机
我的照相机
http://developer.android.com/guide/topics/media/camera.html
Building a Camera App
  • Detect and Access Camera - Create code to check for the existence of cameras and request access.
  • Create a Preview Class - Create a camera preview class that extends SurfaceView and implements theSurfaceHolder interface. This class previews the live images from the camera.
  • Build a Preview Layout - Once you have the camera preview class, create a view layout that incorporates the preview and the user interface controls you want.
  • Setup Listeners for Capture - Connect listeners for your interface controls to start image or video capture in response to user actions, such as pressing a button.
  • Capture and Save Files - Setup the code for capturing pictures or videos and saving the output.
  • Release the Camera - After using the camera, your application must properly release it for use by other applications.
步骤：
1、Detecting camera hardware 检测camera硬件，需要权限
Android 2.3 (API Level 9) 选择检测有几个摄像头： Camera.getNumberOfCameras()

2、Accessing cameras 使用camera
Android 2.3 (API Level 9) or higher , Camera.open(int)多个摄像头，打开指定的摄像头

3、Checking camera features 获取camera的配置信息
Camera.getParameters()，Android 2.3 (API Level 9) or higher，When using API Level 9 or higher, use the Camera.getCameraInfo() to determine if a camera is on the front or back of the device, and the orientation of the image.

4、Creating a preview class 创建一个预览类

5、Placing preview in a layout  设置布局
android:screenOrientation="landscape" 水平朝向

6、Capturing pictures 照相片

7、Manifest Declarations 权限
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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