【发布时间】：2015-07-20 16:53:44
【问题描述】：
我正在尝试显示通过存储在external SD-card 中的相机意图（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 File Explorer 应用程序验证捕获的图像存储在'mCurrentPhotoPath' 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，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 电话中调试此应用程序。
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在ImageView 中显示它。
提前致谢。
【问题讨论】：
标签： android android-imageview android-bitmap bitmapfactory