Camera, a multimedia application in Android

Mainactivity. Java

 

Code

  Package  Com. Amaker. ch11.app;

  Import  Java. Io. file;
  Import  Java. Io. fileoutputstream;
  Import  Java. Io. ioexception;

  Import  Android. App. activity;
 Import  Android. Graphics. pixelformat;
  Import  Android. Hardware. camera;
  Import  Android. OS. asynctask;
  Import  Android. OS. Bundle;
  Import  Android. OS. environment;
  Import  Android. View. keyevent;
  Import  Android. View. surfaceholder;
 Import  Android. View. surfaceview;

  Public     Class  Mainactivity  Extends  Activity {
  //  Declare the camera interface component surfaceview  
    Private  Surfaceview;
  //  Declare the interface control component surfaceholder 
    Private  Surfaceholder;
  //  Declare camera  
    Private  Camera camera;

@ Override
  Public     Void  Oncreate (bundle savedinstancestate ){
  Super . Oncreate (savedinstancestate );
Setcontentview (R. layout. Main );
  //  Instantiate the photo Interface Component  
  Surfaceview  =  (Surfaceview) findviewbyid (R. Id. Preview );
  //  Obtain surfaceholder from surfaceview  
  Surfaceholder  =  Surfaceview. getholder ();
  // Add callback for surfaceholder  
  Surfaceholder. addcallback (surfacecallback );
Surfaceholder. settype (surfaceholder. surface_type_push_buffers );
}

  //  Responds to button events  
  @ Override
  Public     Boolean  Onkeydown (  Int  Keycode, keyevent event ){
  If (Keycode  =  Keyevent. keycode_camera  |  Keycode  =  Keyevent. keycode_search ){
Takepic ();
  Return     True  ;
}
  Return     Super  . Onkeydown (keycode, event );
}
  // Photo Taking Method  
    Private     Void  Takepic (){
  //  Stop Preview  
  Camera. stoppreview ();
  //  Photograph  
  Camera. takepicture (  Null  , Null  , Picturecallback );
}
  //  Photo callback  
  Camera. picturecallback  =     New  Camera. picturecallback (){
@ Override
  Public     Void  Onpicturetaken (  Byte [] Data, camera ){
  New  Savepicturetask(cmd.exe cute (data );
Camera. startpreview ();
}
};

  //  Save photo task  
    Class  Savepicturetask  Extends  Asynctask  <  Byte  [], String, string  > {
@ Override
  Protected  String doinbackground (  Byte  []... Params ){
  //  Create a file  
  File picture  =     New  File (environment. getexternalstoragedirectory (),  "  Picture.jpg  " );
  //  If the file exists, delete it.  
    If  (Picture. exists () picture. Delete ();
  Try  {
  //  Get file output stream  
  Fileoutputstream fos  =     New Fileoutputstream (picture. getpath ());
  //  Write to this file  
  FOS. Write (Params [  0  ]);
  //  Close file stream  
  FOS. Close ();
}  Catch  (Exception e ){
E. printstacktrace ();
}
  Return    Null  ;
}
}
  //  Surfacehodler callback to handle camera opening, camera closing, and Photo size changes  
  Surfaceholder. Callback surfacecallback  =     New  Surfaceholder. Callback (){
@ Override
  Public     Void  Surfacecreated (surfaceholder holder ){
 //  Turn on the camera  
  Camera  =  Camera. open ();
  Try  {
  //  Set Preview  
  Camera. setpreviewdisplay (holder );
}  Catch  (Ioexception e ){
E. printstacktrace ();
}
}

@ Override
 Public     Void  Surfacechanged (surfaceholder holder,  Int  Format,  Int  Width,
  Int  Height ){
  //  Obtain camera parameters  
  Camera. parameters  =  Camera. getparameters ();
 //  Set the Photo size  
  Parameters. setpreviewsize (width, height );
  //  Set the photo format  
  Parameters. setpictureformat (pixelformat. JPEG );
  //  Set camera parameters  
  Camera. setparameters (parameters );
  //  Start Preview  
 Camera. startpreview ();
}

@ Override
  Public     Void  Surfacedestroyed (surfaceholder holder ){
  //  Stop Preview  
  Camera. stoppreview ();
  //  Release camera Resources  
  Camera. Release ();
Camera  =    Null  ;
}
};
} 

 

Main. xml

<? XML version = "1.0" encoding = "UTF-8"?>
<Android. View. surfaceview xmlns: Android = "http://schemas.android.com/apk/res/android"
Android: Id = "@ + ID/preview"
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
>
</Android. View. surfaceview>

 

Androidmanifest. xml

<? XML version = "1.0" encoding = "UTF-8"?>
<Manifest xmlns: Android = "http://schemas.android.com/apk/res/android"
Package = "com. Amaker. ch11.app"
Android: versioncode = "1"
Android: versionname = "1.0" type = "codeph" text = "/codeph">
<Application Android: icon = "@ drawable/icon" Android: Label = "@ string/app_name">
<Activity Android: Name = ". mainactivity"
Android: Label = "@ string/app_name">
<Intent-filter>
<Action Android: Name = "android. Intent. Action. Main"/>
<Category Android: Name = "android. Intent. Category. launcher"/>
</Intent-filter>
</Activity>

</Application>
<Uses-SDK Android: minsdkversion = "3"/>

</Manifest>