Android mobile phone photo

Today, I took a photo on my cell phone for almost one day. Later, I thought about it, and now I don't know what I know, right? First, if I use this method to take a photo,ProgramIn the simulator, problems may occur when it is started. I don't know what the cause is. I guess it may be because of the simulator. At present, there is no mobile phone for testing, which cannot be explained,CodeAs follows:

 
  Intent intent= NewIntent (mediastore. action_image_capture );
Startactivityforresult (intent,0);
 

 

The following figure shows how to get the photo code, because I need to preview the code to the current page and save the address when returning the code. But here I just want to write a simple description of the received data and how to save the photo, the code for receiving photo data is as follows:

  Bundle extras=Data. getextras ();
Bitmap B=(Bitmap) extras. Get ("Data");
 

 

However, when receiving the message, you must first determine whether it is null. Otherwise, errors may occur. After receiving the message, we can save the data and perform other operations, but we do not know why, this method cannot be implemented on the simulator, or it may require hardware support. Because the program needs it, it has been tested multiple times and multiple simulation machines with different sdks have never been successful.

Later, call the following method:

Code

  
  Import  Java. Io. bufferedoutputstream;
  Import  Java. Io. file;
  Import  Java. Io. fileoutputstream;

  Import  Android. App. activity;
  Import  Android. Graphics. Bitmap;
  Import Android. Graphics. bitmapfactory;
  Import  Android. Graphics. pixelformat;
  Import  Android. Hardware. camera;
  Import  Android. Hardware. Camera. picturecallback;
  Import  Android. OS. Bundle;
  Import  Android. View. surfaceholder;
  Import  Android. View. surfaceview;
  Import Android. View. view;
  Import  Android. widget. Button;

  Public     Class  Camera1  Extends  Activity  Implements  Surfaceholder. Callback {

Surfaceview sfview;
Surfaceholder sfholder;
Camera camera;
Button btn1, btn2;
  Byte  [] Bitmpdata;

  /** Called when the activity is first created.  */  
@ Override
  Public     Void  Oncreate (bundle savedinstancestate ){
  Super  . Oncreate (savedinstancestate );
Setcontentview (R. layout. Main );
Btn1  =  (Button) findviewbyid (R. Id. btn1 );
Btn2  =  (Button) findviewbyid (R. Id. btn2 );
Sfview =  (Surfaceview) findviewbyid (R. Id. surface1 );
Sfholder  =  Sfview. getholder ();
Sfholder. settype (surfaceholder. surface_type_push_buffers );  //  Must have a type to display, otherwise it will not be displayed  
  Sfholder. addcallback (  This  );
Btn1.setonclicklistener (  New  View. onclicklistener (){

  Public    Void  Onclick (view v ){
  //  Todo auto-generated method stub  
  Camera. takepicture (  Null  ,  Null  , Piccallback );
}
});
Btn2.setonclicklistener (  New  View. onclicklistener (){

  Public    Void  Onclick (view v ){
  //  Todo auto-generated method stub  
  Savepic ();
}
});
}

  Public     Void  Surfacechanged (surfaceholder holder,  Int  Format,  Int  Width,
 Int  Height ){
  //  Todo auto-generated method stub  
  
Camera. parameters  =  Camera. getparameters ();
Parameters. setpictureformat (pixelformat. JPEG );
Parameters. setpreviewsize (width, height );
Parameters. setpicturesize (  320  ,  480  );
Camera. setparameters (parameters );
Camera. startpreview ();

}

 Public     Void  Surfacecreated (surfaceholder holder ){
  //  Todo auto-generated method stub  
    Try  {
Camera  =  Camera. open ();
Camera. setpreviewdisplay (sfholder );
Camera. autofocus (  New  Camera. autofocuscallback (){

 Public     Void  Onautofocus (  Boolean  Success, camera ){
  //  Todo auto-generated method stub  
    If  (SUCCESS)
Camera. takepicture (  Null  ,  Null , Piccallback );
}
});
}  Catch  (Exception e ){
Camera. Release ();
Camera  =     Null  ;
}
}

  Public     Void  Surfacedestroyed (surfaceholder holder ){
  //  Todo auto-generated method stub  
 Camera. stoppreview ();
Camera  =     Null  ;
}

  Private  Picturecallback piccallback  =     New  Picturecallback (){

  Public     Void  Onpicturetaken (  Byte [] Data, camera ){
  //  Todo auto-generated method stub  
  Bitmpdata  =  Data;
}
};

  Private     Void  Savepic (){
  Try  {
Bitmap bitmap  =  Bitmapfactory. decodebytearray (bitmpdata, 0  ,
Bitmpdata. Length );
File  =     New  File (  "  /Sdcard/camera1.jpg  "  );
Bufferedoutputstream BOS  =     New  Bufferedoutputstream (
  New Fileoutputstream (File ));
Bitmap. Compress (bitmap. compressformat. JPEG,  80  , Bos );
Bos. Flush ();
Bos. Close ();
  //  Canvas canvas = sfholder. lockcanvas ();
  //  Canvas. drawbitmap (bitmap, 0, 0, null );
  //  Sfholder. unlockcanvasandpost (canvas );  
  Camera. stoppreview ();
Camera. startpreview ();
}  Catch (Exception e ){
E. printstacktrace ();
}
}
} 

 

In this way, you can get the code or save the data, but you do not know how to automatically focus, how to control it, and how to zoom in or zoom out the preview photos, I did not check the API, but in this way, the camera can run on the simulator, and some others also need the support of the real machine, and:

 
  Sfholder. settype (surfaceholder. surface_type_push_buffers );//Must have a type to display, otherwise it will not be displayed
 

 

You need to set this type, otherwise it cannot be enabled!

If you have any experience in this area, please contact me!