我是黑莓新手。我现在创建应用程序，我的要求是当相机被调用时自动捕获图片。在黑莓中是否可能。 我正在使用此代码，一切正常，但不能自动捕获图片，请建议我对代码进行哪些更改，它适用于我的应用程序。
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);
}
}
最佳答案
您正在使用传统方法拍照。这就是为什么你不应该使用它:
- 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(即 RIM 在其教程中发布的代码)在某些操作系统和模拟器上会出现问题(事件以不同顺序到达或根本未到达、图像保存时出现多个事件等)。
- 因为没有办法关闭相机应用，你必须求助于 hacky key 注入(inject)方法。
现在，对于操作系统 > 4.6，您可以使用 MMAPI 在应用程序内拍摄快照。这是推荐的方法，除非您正在为旧操作系统进行编程，否则不应使用您发布的方法。检查this tutorial 。此外，从 5.0 开始，您可以使用 AMMAPI 来控制某些相机设置。 Not all controls are implemented ，但最新的操作系统支持大多数基本功能(缩放、对焦、闪光灯等)。检查最新 BlackBerry JDE 中包含的 CameraDemo VideoRecordingDemo 示例。
关于java - 黑莓手机可以自动拍照吗，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10203531/