Question

我正在尝试显示通过相机意图拍摄的照片（触发内置相机应用程序），该照片存储在external SD-card中。

文件路径和文件名存储在String变量'mCurrentPhotoPath'中。

我已验证所捕获的图像是使用'mCurrentPhotoPath'应用存储在ES File Explorer指定的位置，但BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions)始终返回FileNotFoundException。这是我存储捕获图像的代码：

    private void addPicToGallery() {

    File f = new File(mCurrentPhotoPath);
    //for debug purpose only
    Log.i(MYTAG, "value of mCurrentPhotoPath in addPicToGallery: " +mCurrentPhotoPath);
    Log.i(MYTAG, "value of f in addPicToGallery:  " +f);

    Uri contentUri = Uri.fromFile(f);

    //for debug only
    Log.i(MYTAG, "value of contentUri in addPicToGallery: " +contentUri);

    Intent mediaScanIntent = new    Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    mediaScanIntent.setData(contentUri);
    sendBroadcast(mediaScanIntent);

}

解码缩放图像的代码，以便在ImageView中显示：

    private void setFullImageFromFilePath() {

    Log.i(MYTAG, "Entered setFullImageFromFilePath method");

    // Get the dimensions of the View
    int targetW = mImageView.getWidth();
    int targetH = mImageView.getHeight();

    Log.i(MYTAG,"var targetW in setFullImageFromFilePath is:"  +targetW);
    Log.i(MYTAG,"the targetH in setFullImageFromFilePath is:" + targetH);


    // Get the dimensions of the bitmap
    BitmapFactory.Options bmOptions = new BitmapFactory.Options();
    bmOptions.inJustDecodeBounds = true;

    Log.i(MYTAG, "the mCurrentPhotoPath in setFullImageFromFilePath is:" + mCurrentPhotoPath);


   BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
    int photoW= bmOptions.outWidth;
    int photoH = bmOptions.outHeight;

    //Determine how much to scale down the image
    int scaleFactor = Math.min(photoW/targetW, photoH/targetH);

    //Decode the image file into a Bitmap sized to fill the view
    bmOptions.inJustDecodeBounds = false;
    bmOptions.inSampleSize = scaleFactor;
    bmOptions.inPurgeable = true;

    Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
    mImageView.setImageBitmap(bitmap) ;

    }

但是，BitmapFactory.decodeFile无法在mCurrentPhotoPath中存储的位置找到该文件，从而导致FileNotFoundException。

以下是 LogCat 输出：

>07-20 21:28:11.897  32301-32301/org.assignment.lab.Pic I/Lab-Intents﹕ the mCurrentPhotoPath in setFullImageFromFilePath is:file:/storage/sdcard0/Pictures/JPEG_20150720_212749_-232171051.jpg
07-20 21:28:11.907  32301-32301/org.assignment.lab.Pic E/BitmapFactory﹕ Unable to decode stream: java.io.FileNotFoundException: /file:/storage/sdcard0/Pictures/JPEG_20150720_212749_-232171051.jpg: open failed: ENOENT (No such file or directory)
07-20 21:28:11.937  32301-32301/org.assignment.lab.Pic D/AndroidRuntime﹕ Shutting down VM
07-20 21:28:11.937  32301-32301/org.assignment.lab.Pic W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x418d0ce0)
07-20 21:28:12.047  32301-32301/org.assignment.lab.Pic E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: org.assignment.lab.Pic, PID: 32301
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {org.assignment.lab.mydailyselfie/org.coursera.assignment.lab.Pic.MainActivity}: java.lang.ArithmeticException: divide by zero

我正在Android Kitkat 4.4.4手机中调试此应用程序。

请建议BitmapFactory.decodeFile方法中需要进行哪些修改，以便它可以存储文件并将其显示在ImageView中。

提前致谢。

Answer 1

您的mCurrentPhotoPath前缀为“file:”。

因为系统试图引用/file:/storage/sdcard0/etc...指向没有安装的磁盘。

删除它，然后使用

重试

mCurrentPhotoPath = "/storage/sdcard0/Pictures/JPEG_20150720_212749_-232171051.jpg";

或者，如果您的mCurrentPhotoPath始终具有前缀，请在使用之前执行此操作

mCurrentPhotoPath = mCurrentPhotoPath.replace("file:", "");

希望这有帮助！：）

BitmapFactory.decodeFile（mCurrentPhotoPath，bmOptions）返回FileNotFoundException

1 个答案: