是不是可以在黑莓自动捕捉图像

我是黑莓新手。 我现在创建应用程序我的要求是当相机自动调用时图片被捕获。这是可能的黑莓。 我正在使用这个代码每件事都工作，但没有自动捕获图片请建议我改变我的代码它是在我的应用程序上工作。

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); } } 

Answer 1

您正在使用传统方法拍照。 这就是你不应该使用它的原因：

• 因为您要退出应用程序以调用外部应用程序（相机应用程序）。
• 因为您无法控制相机设置。
• 因为您发布的FileJournalListener代码（在其教程中发布的代码RIM）在某些操作系统和模拟器上出现问题（事件以不同的顺序到达或者根本不到达，图像保存上的多个事件等）。
• 因为没有办法关闭相机应用程序，你必须采用hacky键注入方法。

现在，对于操作系统> 4.6，您可以使用MMAPI在应用程序内部拍摄快照。 这是推荐的方法，除非您使用旧版操作系统进行编程，否则不应使用您发布的方法。 查看本教程 。 此外，从5.0开始，您可以使用AMMAPI来控制某些相机设置。 并非所有控件都已实现 ，但最新的操作系统支持最基本的控件 （缩放，焦点，闪光等）。 检查最新BlackBerry JDE中包含的CameraDemo VideoRecordingDemo示例。

Answer 2

试试这段代码，这会自动拍照。

 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; } } }