在黑莓拍照

Question

我是黑莓新手。創建一個程序從黑莓的相機拍照時，我遇到了麻煩。我使用了黑莓開發者站點Code sample: Taking a picture in a BlackBerry device application提供的示例代碼。 構建此代碼時我沒有遇到任何問題，但它並未在模擬器或黑莓手機上運行。 這是我正在使用的代碼。請幫幫我！謝謝！

package mypackage; 

import net.rim.device.api.amms.control.camera.*; 
import net.rim.device.api.ui.*; 
import net.rim.device.api.ui.component.*; 
import net.rim.device.api.ui.container.*; 
import javax.microedition.media.*; 
import javax.microedition.media.control.*; 

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 { 
     Player _p; 
     VideoControl _videoControl; 

     public ImageCaptureDemoScreen() { 
      try { 
       _p = javax.microedition.media.Manager 
         .createPlayer("capture://video?encoding=jpeg&width=1024&height=768"); 
       _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()); 
      } 
     } 

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

      if (!handled) { 
       if (action == ACTION_INVOKE) { 
        try { 
         byte[] rawImage = _videoControl.getSnapshot(null); 
        } catch (Exception e) { 
         Dialog.alert(e.toString()); 
        } 
       } 
      } 
      return handled; 
     } 
    } 
} 

Answer 1

public class CameraScreen extends MainScreen 
{ 
    private VideoControl _videoControl; 
    private Field _videoField; 
    private EncodingProperties[] _encodings;  
    private int _indexOfEncoding = 0; 
    private ZoomControl _zoomControl; 
    CameraScreen cameraScreen; 
    public CameraScreen() 
    { 
     cameraScreen= this; 
     initializeCamera(); 
     initializeEncodingList(); 
     if(_videoField != null) 
     { 
      createUI(); 
     } 
     else 
     { 
      add(new RichTextField("Error connecting to camera.")); 
     } 
    } 
    protected boolean touchEvent(TouchEvent event) 
    { 
     if(event.getEvent() == TouchEvent.GESTURE) 
     { 
      TouchGesture gesture = event.getGesture(); 
      if(gesture.getEvent() == TouchGesture.SWIPE) 
      { 
       final int direction = gesture.getSwipeDirection(); 
       UiApplication.getApplication().invokeLater(new Runnable() 
       { 
        public void run() 
        { 
         if(direction == TouchGesture.SWIPE_NORTH) 
         { 
          _zoomControl.setDigitalZoom(ZoomControl.NEXT); 
         } 
         else if(direction == TouchGesture.SWIPE_SOUTH) 
         { 
          _zoomControl.setDigitalZoom(ZoomControl.PREVIOUS); 
         } 
        } 
       }); 

       return true; 
      } 
     } 

     return false; 
    } 

    public void takePicture() 
    { 
     try 
     { 
      String encoding = null;    

      if(_encodings != null) 
      { 
       encoding = _encodings[_indexOfEncoding].getFullEncoding(); 
      } 
      createImageScreen(_videoControl.getSnapshot(encoding)); 
     } 
     catch(Exception e) 
     { 
     } 
    } 

    protected boolean onSavePrompt() 
    { 
     return true; 
    } 

    /** 
    * Initializes the Player, VideoControl and VideoField 
    */ 
    private void initializeCamera() 
    { 
     try 
     { 
      Player player = Manager.createPlayer("capture://video"); 
      player.realize(); 
      _videoControl = (VideoControl)player.getControl("VideoControl"); 

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

      player.start(); 
     } 
     catch(Exception e) 
     { 
     } 
    } 

    /** 
    * Initialize the list of encodings 
    */ 
    private void initializeEncodingList() 
    { 
     try 
     { 
      String encodingString = System.getProperty("video.snapshot.encodings"); 
      String[] properties = StringUtilities.stringToKeywords(encodingString); 
      Vector encodingList = new Vector(); 
      String encoding = "encoding"; 
      String width = "width"; 
      String height = "height"; 
      EncodingProperties temp = null; 

      for(int i = 0; i < properties.length ; ++i) 
      { 
       if(properties[i].equals(encoding)) 
       { 
        if(temp != null && temp.isComplete()) 
        { 
         // Add a new encoding to the list if it has been 
         // properly set. 
         encodingList.addElement(temp); 
        } 
        temp = new EncodingProperties(); 

        // Set the new encoding's format 
        ++i; 
        temp.setFormat(properties[i]); 
       } 
       else if(properties[i].equals(width)) 
       { 
        // Set the new encoding's width 
        ++i; 
        temp.setWidth(properties[i]); 
       } 
       else if(properties[i].equals(height)) 
       { 
        // Set the new encoding's height 
        ++i; 
        temp.setHeight(properties[i]); 
       } 

      } 

      // If there is a leftover complete encoding, add it. 
      if(temp != null && temp.isComplete()) 
      { 
       encodingList.addElement(temp); 
      } 

      // Convert the Vector to an array for later use 
      _encodings = new EncodingProperties[ encodingList.size() ]; 
      encodingList.copyInto((Object[])_encodings); 
     } 
     catch (Exception e) 
     { 
      // Something is wrong, indicate that there are no encoding options 
      _encodings = null; 
     } 
    } 

    /** 
    * Adds the VideoField to the screen 
    */ 
    private void createUI() 
    { 
     // Add the video field to the screen 
     add(_videoField); 
    } 

    /** 
    * Create a screen used to display a snapshot 
    * @param raw A byte array representing an image 
    */ 
    private void createImageScreen(byte[] raw) 
    {  
     UiApplication.getUiApplication().popScreen(cameraScreen); 
     ImageScreen imageScreen = new ImageScreen(raw); 
     UiApplication.getUiApplication().pushScreen(imageScreen); 
    } 

    /** 
    * Sets the index of the encoding in the 'encodingList' Vector 
    * @param index The index of the encoding in the 'encodingList' Vector 
    */ 
    public void setIndexOfEncoding(int index) 
    { 
     _indexOfEncoding = index; 
    } 

    /** 
    * @see net.rim.device.api.ui.Screen#invokeAction(int) 
    */ 
    protected boolean invokeAction(int action) 
    { 
     boolean handled = super.invokeAction(action); 

     if(!handled) 
     { 
      switch(action) 
      { 
      case ACTION_INVOKE: // Trackball click 
      {   
       takePicture(); 
       return true; 
      } 
      } 
     }   
     return handled;     
    } 
} 


public static class ImageScreen extends MainScreen 
{ 
    private static final int IMAGE_SCALING = 7; 
    private static String FILE_NAME = System.getProperty("fileconn.dir.photos") + "IMAGE"; 
    private static String EXTENSION = ".bmp"; 
    private static int _counter; 
    private ImageScreen _imageScreen; 
    public ImageScreen(final byte[] raw) 
    { 
     _imageScreen = this; 

     setTitle("IMAGE"); 
     Bitmap image = Bitmap.createBitmapFromBytes(raw, 0, -1, IMAGE_SCALING); 

     HorizontalFieldManager hfm1 = new HorizontalFieldManager(Field.FIELD_HCENTER); 
     HorizontalFieldManager hfm2 = new HorizontalFieldManager(Field.FIELD_HCENTER); 

     BitmapField imageField = new BitmapField(image); 
     hfm1.add(imageField); 

     ButtonField photoButton = new ButtonField("Save"); 
     photoButton.setChangeListener(new SaveListener(raw)); 
     hfm2.add(photoButton); 

     ButtonField cancelButton = new ButtonField("Cancel"); 
     cancelButton.setChangeListener(new CancelListener()); 
     hfm2.add(cancelButton); 

     add(hfm1); 
     add(hfm2); 
    } 
    protected boolean invokeAction(int action) 
    { 
     boolean handled = super.invokeAction(action); 

     if(!handled) 
     { 
      switch(action) 
      { 
      case ACTION_INVOKE: // Trackball click. 
      {   
       return true; 
      } 
      } 
     }   
     return handled;   
    } 

    private class SaveListener implements FieldChangeListener 
    { 
     private byte[] _raw; 

     SaveListener(byte[] raw) 
     { 
      _raw = raw; 
     } 

     public void fieldChanged(Field field, int context) 
     { 
      try 
      {  
       FileConnection file = (FileConnection)Connector.open(FILE_NAME + _counter + EXTENSION); 
       while(file.exists()) 
       { 
        file.close(); 
        ++_counter; 
        file = (FileConnection)Connector.open(FILE_NAME + _counter + EXTENSION); 
       } 

       file.create(); 
       OutputStream out = file.openOutputStream(); 
       out.write(_raw); 

       out.close(); 
       file.close(); 
      } 
      catch(Exception e) 
      { 
      } 

      String full_path = FILE_NAME + _counter + EXTENSION; 
      setOnBitmapField(full_path); 
      selectedImagePath= full_path; 
      ++_counter; 

      UiApplication.getUiApplication().popScreen(_imageScreen); 
     } 
    } 

    private class CancelListener implements FieldChangeListener 
    { 
     public void fieldChanged(Field field, int context) 
     { 
      UiApplication.getUiApplication().popScreen(_imageScreen); 
     } 
    } 
} 

=======

public final class EncodingProperties 
{ 
    private String _format; 
    private String _width; 
    private String _height; 
    private boolean _formatSet; 
    private boolean _widthSet; 
    private boolean _heightSet;  
    public void setFormat(String format) 
    { 
     _format = format; 
     _formatSet = true; 
    } 

public void setWidth(String width) 
{ 
    _width = width; 
    _widthSet = true; 
} 

public void setHeight(String height) 
{ 
    _height = height; 
    _heightSet = true; 
}  

public String toString() 
{ 
    StringBuffer display = new StringBuffer(); 

    display.append(_width); 
    display.append(" x "); 
    display.append(_height); 
    display.append(" "); 
    display.append(_format);     

    return display.toString(); 
} 
public String getFullEncoding() 
{ 
    StringBuffer fullEncoding = new StringBuffer(); 

    fullEncoding.append("encoding="); 
    fullEncoding.append(_format); 

    fullEncoding.append("&width="); 
    fullEncoding.append(_width); 

    fullEncoding.append("&height="); 
    fullEncoding.append(_height);   

    return fullEncoding.toString(); 
} 

public boolean isComplete() 
{ 
    return _formatSet && _widthSet && _heightSet; 
} 
}