[檢查下半場(chǎng)的最后一次編輯,了解主要問(wèn)題的更新]

我的手機(jī)將其圖片存儲(chǔ)在SD卡上.我使用CameraUI拍照,然后我想分析并刪除它.

代碼(簡(jiǎn)化)：

private function startCapture():void
{
    _camera = new CameraUI();
    _camera.addEventListener( MediaEvent.COMPLETE, onCapture );

    _camera.launch(MediaType.IMAGE); //works fine
}


private function onCapture(e:MediaEvent):void
{
    var loader:Loader = new Loader();

    _filePromise = e.data;
    loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onAsyncMediaComplete);
    loader.loadFilePromise(m__filePromise);
}


private function onAsyncMediaComplete(e:Event):void
{
    var loader:Loader = (e.currentTarget as LoaderInfo).loader; 
    //here the loader contains the picture as expected

    //FIXME adds an empty picture instead of deleting
    _filePromise.file.deleteFile();
}

我希望SD卡上的圖片被刪除,但它仍然存在,并且旁邊會(huì)創(chuàng)建一個(gè)新的虛擬文件.
我追蹤了文件的URL并得到了存儲(chǔ)/ sdcard0 / DCIM / Camera / IMG_20131016_204700.jpg

我的Android清單包括

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

編輯：

如this article所示,AIR創(chuàng)建了兩張圖片,一張?jiān)贒CIM / Camera中,另一張?jiān)贒CIM / 100MEDIA中.按照建議,我掃描了DCIM的子文件夾,查找具有相同時(shí)間戳( – 3秒)和與event.data.file相同大小的圖片.然后刪除這兩張圖片.這是代碼：

var date:Date = m__filePromise.file.modificationDate;
var size:Number = m__filePromise.file.size;
trace("looking for", date.time, size);
var cameraFolder:File = m__filePromise.file.parent.parent;
var pictureFolders:/*File*/Array = cameraFolder.getDirectoryListing();
var pictures:/*File*/Array;
for each(var folder:File in pictureFolders)
{
    pictures = folder.getDirectoryListing();
    for each(var pic:File in pictures)
    {
        if (pic.size == size &&
            Math.abs(pic.modificationDate.time - date.time) < 3000)
        {
            //approximatively the same date, same size, let's delete the copy
            trace("delete", pic.modificationDate.time, pic.size, pic.name);
            pic.deleteFile();
        }
    }
}

問(wèn)題是deleteFile不起作用,它留下一個(gè)具有相同名稱的空文件(0b).我已經(jīng)閱讀了它的緩存問(wèn)題,我發(fā)現(xiàn)的唯一解決方法是本機(jī)代碼.

解決方法:

是的,這是Android上的媒體文件的緩存問(wèn)題.你必須找到一種方法如何啟動(dòng)Intent.ACTION_MEDIA_MOUNTED或其他一些方法來(lái)刷新設(shè)備的MediaStore(可能是Native擴(kuò)展)

另一種解決方案是使用Camera類(lèi)并直接在您的應(yīng)用中拍攝照片.這是一種極簡(jiǎn)主義的方式,可以直接在您的應(yīng)用中拍照

    private var _video : Video;
    private var _cameraImage : Bitmap;
    private var _camera : Camera;

    /**
     * initilize camera
     */
    private function initCamera() : void {

        //get camera
        _camera = getCamera(CameraPosition.FRONT);
        _camera.setMode(_streamW, _streamH, streamFPS, true);
        _camera.setQuality(0, 100);
        _camPosition = CameraPosition.FRONT;

         //camera preview
        _video = new Video(_streamW, _streamH);
        _video.attachCamera(_camera);


        //rotate        
        var m : Matrix = new Matrix();
        m.rotate(Math.PI / 2);
        m.translate(_video.height, 0);
        this._video.transform.matrix = m;
        addChild(_video);
    }

    /**
     * takes photo and saves to bitmap
     */
    private function onTakePhoto(event : GestureEvent) : void {     
        var cameraBitmap : BitmapData = new BitmapData(_streamH, _streamW, true, 0x0);
        cameraBitmap.draw(_video, _video.transform.matrix);
        _cameraImage = new Bitmap(cameraBitmap);
    }

    /**
     * finds camera in desired position
     */
    private function getCamera(position : String) : Camera {
        for (var i : uint = 0; i < Camera.names.length;   i) {
            var cam : Camera = Camera.getCamera(String(i));
            if (cam.position == position) return cam;
        }
        return Camera.getCamera();
    }

如果您直接在應(yīng)用程序中拍攝照片,您將失去原生照片應(yīng)用程序的許多功能,但在操作和保存圖像時(shí)可以完全控制,還可以提供特定于您的應(yīng)用程序的自定義界面.您也可以嘗試使用此原生擴(kuò)展http:///native-extensions#camera,這樣您就可以直接在應(yīng)用程序中使用相機(jī)的一些更高級(jí)的功能.