我正在尝试显示通过存储在外部 SD 卡 中的相机 Intent (触发内置相机应用程序)捕获的图片。
文件路径和文件名存储在字符串变量'mCurrentPhotoPath'中。
我已使用 ES 文件资源管理器 应用验证捕获的图像存储在 'mCurrentPhotoPath' 指定的位置，但是 BitmapFactory.decodeFile(mCurrentPhotoPath , bmOptions) 总是返回 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);
}
解码缩放图像以在 ImageView 中显示的代码:
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 中存储的位置找到文件，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 手机中调试这个应用程序。
请建议在 BitmapFactory.decodeFile 方法中需要进行哪些修改，以便它可以获取存储的文件并将其显示在 ImageView 中。
提前致谢。
最佳答案
您的 mCurrentPhotoPath 有一个前缀“file:”。
因为系统正在尝试引用 /file:/storage/sdcard0/etc...，它指向没有安装的磁盘。
删除它并重试
mCurrentPhotoPath = "/storage/sdcard0/Pictures/JPEG_20150720_212749_-232171051.jpg";
或者，如果您的 mCurrentPhotoPath 始终具有前缀，请在使用前执行此操作
mCurrentPhotoPath = mCurrentPhotoPath.replace("file:", "");
希望对您有所帮助! :)
关于android - BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions) 返回 FileNotFoundException，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31522066/