Simple Android camera program

After several errors, I modified a simple camera.ProgramFinished, photographyCodeAs follows:

 

 

Code

  1   Class  Surface  Extends  Surfaceview  Implements  Surfaceholder. Callback {
  2   
 3   Surfaceholder sfholder;
  4   
  5   Camera camera;
  6   
  7   Bitmap bitmap;
  8   
  9     Public  Surface (context ){
 10     Super  (Context );
  11     //  Todo auto-generated constructor stub  
  12      
  13   Sfholder  =  Getholder ();
 14   Sfholder. addcallback (  This  );
  15   Sfholder. settype (surfaceholder. surface_type_push_buffers );
  16   }
  17   
  18     Public     Void Surfacechanged (surfaceholder holder,  Int  Format,  Int  Width,
  19     Int  Height ){
  20     //  Todo auto-generated method stub  
  21     Camera. parameters  =  Camera. getparameters ();
  22   Parameters. setpictureformat (pixelformat. JPEG );
  23   Parameters. setpreviewsize (  320  ,  480  );
  24   Parameters. setpicturesize (  320  , 480  );
  25   Camera. setparameters (parameters );
  26   Camera. startpreview ();
  27   }
  28   
  29     Public     Void Surfacecreated (surfaceholder holder ){
  30     //  Todo auto-generated method stub  
  31      
  32     Try  {
  33   Camera  = Camera. open ();
  34   Camera. setpreviewdisplay (sfholder );
  35   }  Catch  (Exception e ){
  36   Camera. Release ();
  37   Camera  =     Null  ;
 38   }
  39   }
  40   
  41     Public     Void  Surfacedestroyed (surfaceholder holder ){
  42     //  Todo auto-generated method stub 
  43      Camera. stoppreview ();
  44   Camera  =     Null  ;
  45   
  46   }
  47   // Take a photo
  48    Public     Void  Takepicture ()
  49   {
  50     If  (Camera  ! =     Null  )
  51   {
 52   Camera. takepicture (  Null  ,  Null  , Callback );
  53   }
  54   }
  55   
  56     //  The callback function for taking the photo and saving it 
  57      
  58     Private  Picturecallback callback  =     New  Picturecallback (){
  59   
  60    Public     Void  Onpicturetaken (  Byte  [] Data, camera ){
  61     //  Todo auto-generated method stub  
  62     Try  
  63  {
  64   Bitmap  =  Bitmapfactory. decodebytearray (data,  0  , Data. Length );
  65   File  =     New  File (  "  /Sdcard/camera1.jpg  " );
  66   Bufferedoutputstream BOS  =     New  Bufferedoutputstream (  New  Fileoutputstream (File ));
  67   Bitmap. Compress (bitmap. compressformat. JPEG,  80  , Bos );
  68   Bos. Flush ();
 69   Bos. Close ();
  70   Canvas canvas  =  Sfholder. lockcanvas ();
  71   Canvas. drawbitmap (bitmap,  0  ,  0  ,  Null  );
  72  Sfholder. unlockcanvasandpost (canvas );
  73   }
  74     Catch  (Exception E)
  75   {
  76   E. printstacktrace ();
  77   }
  78   }
 79   }
  80   } 

 

This is a photo class, which is implemented by surfaceview. If you want to display a part of it and use buttons, you can modify this class, in addition, if you want to stay on the photo page after taking a photo, you can modify and add parameters on your own.

 

This program also demonstrates how to save the photo to the SD card after taking the photo.

In actual use, the button is used to take a photo. In fact, you can also use the button to take a photo, as long as you make a simple modification to this class. The call is as follows:

 

Code

  @ Override
Public Boolean onkeydown (INT keycode, keyevent event ){
// Todo auto-generated method stub
If (keycode = keyevent. keycode_dpad_center)
SF. takepicture ();
Return super. onkeydown (keycode, event );
}
 

 

 

To use a camera and an SD card, you must add the following permissions:

 

  <Uses-PermissionAndroid: Name= "Android. Permission. write_external_storage"> </Uses-Permission>
<Uses-PermissionAndroid: Name= "Android. Permission. Camera"> </Uses-Permission>
 

 

The first option is to extend the permissions of the storage device.

 

Article 2: camera devices can be used

If you do not have these two permissions, an error is returned. You can view the error in ddms. Welcome!

Hope to help you!

 

This platform uses the android 1.5 V8 system. If you use or another version, the permissions may be different!

 

Of course, the better way is to first check whether the SD card exists. This program does not detect it, because I am only using the exercise camera.

The check code is as follows:

Code

  If  (Environment. getexternalstoragestate (). Equals (Android. OS. environment. media_mounted )){
File sdcardpath  = Environment. getexternalstoragedirectory ();
Settitle (sdcardpath. getname ());  //  Set the path name of the SD card as the title to make everyone better understand.  
  }  Else  {
Toast. maketext (recordtest.  This  ,  "  No SD card  "  ,  1000  ). Show ();
}