is it possible in blackberry to capture image auto

问题:

I am new in blackberry. i create Application now my requirement is when camera is invoke automatic a picture is capture.Is it possible in blackberry. i am using this code every thing work but not capture picture automatic please suggest what i change on my code it's work on my Application.

 public class Test extends MainScreen  implements FileSystemJournalListener {
    long _lastUSN;
    ButtonField btnTakePhoto;
    String capturedImgPath = "";
    VideoControl videoControl;
    Timer objTimer;
    Player player;


    public Test()
    {
        super();
        btnTakePhoto    =   new ButtonField("Take Picture",ButtonField.VCENTER|ButtonField.BOTTOM);
        btnTakePhoto.setChangeListener(TakePictureListener);
        HorizontalFieldManager hfm=new HorizontalFieldManager();    
        hfm.add(btnTakePhoto);
        add(hfm);

        System.out.println("Inside Construct");
        UiApplication.getUiApplication().addFileSystemJournalListener(this);
        _lastUSN = FileSystemJournal.getNextUSN();
        this.setTitle("Camera Class");
    }



    FieldChangeListener TakePictureListener = new FieldChangeListener(){

        public void fieldChanged(Field field, int context) {
            System.out.println("Inside fieldChanged");
            doTakePicture();
        }
    };
    public void doTakePicture(){
        try
        {

            System.out.println("Inside doTakePicture");
          Invoke.invokeApplication(Invoke.APP_TYPE_CAMERA,new CameraArguments());
          player = javax.microedition.media.Manager.createPlayer("capture://video");
          player.realize();

          videoControl = (VideoControl) player.getControl("VideoControl");
          player.start();
          if(videoControl!=null)
          {
              Field videoField = (Field) videoControl.initDisplayMode (VideoControl.USE_GUI_PRIMITIVE, "net.rim.device.api.ui.Field");


              videoControl.setDisplayFullScreen(true);
              videoControl.setVisible(true);
               add(videoField);
//            System.out.println("videoControl=="+videoControl);
//            String imagetype = "encoding=jpeg&width=1024&height=768&quality=fine";    
//           
//            byte[] snapshot = videoControl.getSnapshot(imagetype);
//            Bitmap image = Bitmap.createBitmapFromBytes(snapshot, 0, snapshot.length, 5);
//            System.out.println("snapshot=="+snapshot);
//            System.out.println("image=="+image);
//            BitmapField bitmapField = new BitmapField();
//            bitmapField.setBitmap(image);
//            this.add(bitmapField);
//            if(videoField != null)
//              {
//                  add(videoField);
//                 
//              }

          }



        }



    catch(Exception ex)
     {
        System.out.println(ex);

     }
    }

    public boolean invokeAction(int action)
    {
        System.out.println("Action=="+action);
    boolean handled = super.invokeAction(action); 
    //handled=true;
    System.out.println("handled=="+handled);
    System.out.println("Inside Invoke Camera");

    if(!handled)
    {    
        System.out.println("Inside First If Blog"); 
        if(action == ACTION_INVOKE)
        {   
            System.out.println("Inside Second If Blog");
           try
            {    
                System.out.println("If Blog of invoke Action");


                System.out.println("videoControl11=="+videoControl);
              String imagetype = "encoding=jpeg&width=1024&height=768&quality=fine";    
              byte[] snapshot = videoControl.getSnapshot(imagetype);
              Bitmap image = Bitmap.createBitmapFromBytes(snapshot, 0, snapshot.length, 5);
              System.out.println("snapshot=="+snapshot);
              System.out.println("image=="+image);
              BitmapField bitmapField = new BitmapField();
              bitmapField.setBitmap(image);
              this.add(bitmapField);


           }
            catch(Exception e)
            {
                Dialog.alert(e.toString());
            }
     } 


    }
    return handled;                
}  



    public void fileJournalChanged() 
    {
        System.out.println("Inside fileJournalChanged");
        long nextUSN = FileSystemJournal.getNextUSN();
        String msg = null;
        String path = null;
        for (long lookUSN = nextUSN - 1; lookUSN >= _lastUSN && msg == null; --lookUSN) 
        {
            FileSystemJournalEntry entry = FileSystemJournal.getEntry(lookUSN);

            if (entry == null) 
            { 
                break;
            }

             path = entry.getPath();
             System.out.println("Path=="+path);

            if (path != null)               
            {
             if (path.endsWith("png") || path.endsWith("jpg") || path.endsWith("bmp") || path.endsWith("gif") ){    
                switch (entry.getEvent()) 
                {


                    case FileSystemJournalEntry.FILE_ADDED:
                        System.out.println("Inside FILE_ADDED");
                        msg = "File was added.";
                        break;

                    case FileSystemJournalEntry.FILE_DELETED:
                        System.out.println("Inside FILE_DELETED");
                        msg = "File was deleted.";
                        break;
                }
             } 
            }
        }
        _lastUSN = nextUSN;

        if ( msg != null ) 
        {
            Dialog.alert(msg);
            capturedImgPath =   path;
            closeCamera();
        }
    }
   private void closeCamera()
    {
        int menuOrder =6;
        System.out.println("Inside Close Camera");
        EventInjector.invokeEvent(new EventInjector.KeyCodeEvent(EventInjector.KeyCodeEvent.KEY_DOWN, (char)Keypad.KEY_MENU, KeypadListener.STATUS_NOT_FROM_KEYPAD, 0));
        EventInjector.invokeEvent(new EventInjector.TrackwheelEvent(EventInjector.TrackwheelEvent.THUMB_ROLL_DOWN, menuOrder, KeypadListener.STATUS_NOT_FROM_KEYPAD));
        EventInjector.invokeEvent(new EventInjector.TrackwheelEvent(EventInjector.TrackwheelEvent.THUMB_CLICK, 1, KeypadListener.STATUS_NOT_FROM_KEYPAD));
        Dialog.alert("The captured Image path is "+capturedImgPath);
   }



}

回答1:

You are using a legacy approach to take pictures. This is why you shouldn't use it:

• Because you are exiting your application to call an external application (the camera app).
• Because you don't have control over the camera settings.
• Because the FileJournalListener code that you posted, which is the code RIM published in its tutorial, gives problems on some OSes and simulators (events arriving in a different order or not arriving at all, multiple events on image save, etc).
• Because there is no way to close the camera app and you have to resort to the hacky key injection method.

So now, for OSes > 4.6, you can use MMAPI to take snapshot inside your app. This is the recommended method and you should not use the one you posted unless you are programming for legacy OSes. Check this tutorial. Also, from 5.0 onwards you can use AMMAPI to control some camera settings. Not all controls are implemented, but most basic ones (zoom, focus, flash, etc) are supported in the latest OSes. Check the CameraDemo VideoRecordingDemo sample included in the latest BlackBerry JDE.

回答2:

Try this code, this will automatically take picture.

import java.io.OutputStream;
import java.util.Timer;
import java.util.TimerTask;

import javax.microedition.io.Connector;
import javax.microedition.io.file.FileConnection;
import javax.microedition.media.Player;
import javax.microedition.media.control.VideoControl;

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.BitmapField;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.container.MainScreen;

public class ImageCaptureDemo extends UiApplication
{
public static void main(String[] args)
{
    ImageCaptureDemo app = new ImageCaptureDemo();
    app.enterEventDispatcher();
}

public ImageCaptureDemo()
{
    pushScreen(new ImageCaptureDemoScreen());
}   

class ImageCaptureDemoScreen extends MainScreen
{   
    Timer timer ;
    Player _p;
    VideoControl _videoControl;    

    public ImageCaptureDemoScreen()
    {
        try 
        {
            _p = javax.microedition.media.Manager.createPlayer("capture://video?encoding=jpeg&width=320&height=240");
            _p.realize();
            _videoControl = (VideoControl) _p.getControl("VideoControl");

            if (_videoControl != null)
            {
                Field videoField = (Field) _videoControl.initDisplayMode (VideoControl.USE_GUI_PRIMITIVE, "net.rim.device.api.ui.Field");
                _videoControl.setDisplayFullScreen(true);
                _videoControl.setVisible(true);
                _p.start();

                /*EnhancedFocusControl efc = (EnhancedFocusControl)p.getControl("net.rim.device.api.amms.control.camera.EnhancedFocusControl");
                efc.startAutoFocus();*/

                if(videoField != null)
                {
                    add(videoField);
                }
            } 
        }
        catch(Exception e)
        {
            Dialog.alert(e.toString());
        }


        timer = new Timer();
        timer.schedule(new CountDown(), 3000);


    }

    public class CountDown extends TimerTask {
      public void run() {
         DismissThread dThread = new DismissThread();
         invokeLater(dThread);
      }
   }
 public void dismiss() {
      timer.cancel();
     invokeAction(ACTION_INVOKE);
    _videoControl.setVisible(false);

   }
   public class DismissThread implements Runnable {
          public void run() {
             dismiss();
          }
       }



    protected boolean invokeAction(int action)
    {
        boolean handled = super.invokeAction(action); 

        if(!handled)
        {
            if(action == ACTION_INVOKE)
            {   
                try
                {                      
                    byte[] rawImage = _videoControl.getSnapshot(null);  


                    FileConnection conn = (FileConnection)Connector.open("file:///SDCard/BlackBerry/pictures/"+System.currentTimeMillis()+".jpeg", Connector.READ_WRITE);
                    conn.create();
                    OutputStream out = conn.openOutputStream();
                    out.write(rawImage);
                    out.flush();
                    out.close();
                    conn.close();

                    /*

                    Bitmap image = Bitmap.createBitmapFromBytes(rawImage, 0, rawImage.length, 5);
                    BitmapField bitmapField = new BitmapField();
                    bitmapField.setBitmap(image);
                    this.add(bitmapField);
              */

                }
                catch(Exception e)
                {
                    Dialog.alert(e.toString());
                }
            }
        }           
        return handled;                
    }  
}   
}