(Android hardware Application Practice) camera photography implementation and summary

Two risks should be taken into consideration before camera photography can be used.

[1] Not every android machine can use your application

Main reasons:

The camera takes pictures. The app calls the android system API, the system API, and the underlying driver. The app calls the underlying driver hardware.

Generally, android mobile phones have a vendor-defined write driver to implement the operating system, and some customized small manufacturers' android system API implementations are not complete, or are not supported. As a result, an exception occurs when your application is installed.

[2] The response time varies depending on different models and brand machines.

Main reasons: Currently, the performance of the android mobile phone is still limited. The response time of the mobile phone hardware is not the same for different configurations. Example: Call the lens, the initialization time of the lens, the time when the camera responds to the camera instruction, etc.

 

Frontier:The practical application of this Article is timed continuous photo taking, and there is no flash or sound during the photo taking process. The following is a summary of the camera calling during the application implementation process.

 

1Step 1Initialize Camera

Initialization Process

Get a Camera instance

 

 camera =Camera.open();

 

Set the camera parameters (no flashlight and the camera angle turns 90 degrees). Note: The default camera is a horizontal camera)

 

Camera.Parameters parameters=camera.getParameters();
        parameters.setFlashMode("off");
        parameters.set("rotation",90);
        camera.setParameters(parameters);

Enable Preview (you must call this function before executing the camera command)

 

 camera.startPreview();

 

2Set the camera instruction and callFeedback events to get and store photos

Set feedback events:

    PictureCallback pictureCallback=new PictureCallback(){
public void onPictureTaken(byte[] data,Camera camera)
        {
            FileOutputStream outSteam=null;

try{

                SimpleDateFormat format=new SimpleDateFormat("yyyyMMddHHmmss");
                String times=format.format((new Date()));

                outSteam=new FileOutputStream("/sdcard/MyImages/"+times+".jpg");
                outSteam.write(data);
                outSteam.close();

            }
catch(FileNotFoundException e)
            {
                Log.d("Camera", "row");

            } catch (IOException e) {
// TODO Auto-generated catch block
                e.printStackTrace();
            }

        };
    };

 

Execute the photo instruction

 

3After taking the photo, release the camera.

camera.takePicture(null, null, pictureCallback);

4Configure permissions:

Set camera permissions in the AndroidManifest. xml file

<Uses-permission android: name = "android. permission. CAMERA"/>

 

Note: The current application has been released:

Http://www.appchina.com/soft_detail_180936_0_10.html