android– 无法解码流java.io.FileNotFoundExceptionstorageemulated0 open failed：ENOENT(没有这样的文件或目录

概述您好我正在尝试保存在我的应用程序上拍摄的照片,但是当我尝试访问内存以放置数据时,会出现错误无法解码流java.io.FileNotFoundException/storage/emulated/0openfailed：ENOENT(没有这样的文件或目录)这是我的代码.Camera.PictureCallbackmPictureCallback

您好我正在尝试保存在我的应用程序上拍摄的照片,但是当我尝试访问内存以放置数据时,会出现错误

无法解码流java.io.fileNotFoundException / storage / emulated / 0 open Failed：ENOENT(没有这样的文件或目录)

这是我的代码.

            Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {        public voID onPictureTaken(byte[] data, Camera camera) {            // Todo auto-generated method stub            if (data != null){                //Intent mIntent = new Intent();                //mIntent.putExtra("image",imageData);                mCamera.stopPrevIEw();                mPrevIEwRunning = false;                mCamera.release();                 try{                     BitmapFactory.Options opts = new BitmapFactory.Options();                     Bitmap bitmap= BitmapFactory.decodeByteArray(data, 0, data.length,opts);                     bitmap = Bitmap.createScaledBitmap(bitmap, 300, 300, false);                     int wIDth = bitmap.getWIDth();                     int height = bitmap.getHeight();                     int newWIDth = 300;                     int newHeight = 300;                     // calculate the scale - in this case = 0.4f                     float scaleWIDth = ((float) newWIDth) / wIDth;                     float scaleHeight = ((float) newHeight) / height;                     // createa matrix for the manipulation                     Matrix matrix = new Matrix();                     // resize the bit map                     matrix.postscale(scaleWIDth, scaleHeight);                     // rotate the Bitmap                     matrix.postRotate(-90);                     Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,                             wIDth, height, matrix, true);                     Camera_local_db.image.setimageBitmap(resizedBitmap);                 }catch(Exception e){                     e.printstacktrace();                 }               // StoreByteImage(mContext, imageData, 50,"Imagename");                //setResult(FOTO_MODE, mIntent);                setResult(585);                finish();            }               }    };    Camera.PictureCallback jpegCallback = new Camera. PictureCallback() {    @OverrIDe    public voID onPictureTaken(byte[] data, Camera camera) {        file dir_image2 = new  file(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM),"dddd.jpg");        dir_image2.mkdirs();  //AGAIN CHOOSING FolDER FOR THE PICTURE(WHICH IS liKE A SURFACEVIEW                                 //SCREENSHOT)        if (!dir_image2.mkdirs()) {            Log.e(TAG, "Directory not created");        }        file tmpfile = new file(dir_image2,"TempGhost.jpg"); //MAKING A file IN THE PATH                                         //dir_image2(SEE RIGHT ABOVE) AND NAMING IT "TempGhost.jpg" OR ANYTHING ELSE        try {//SAVING            fileOutputStream fos = new fileOutputStream(tmpfile);            fos.write(data);            fos.close();            //grabImage();        } catch (fileNotFoundException e) {            Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_LONG).show();        } catch (IOException e) {            Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_LONG).show();        }        //String path = Environment.getExternalStoragePublicDirectory(    Environment.DIRECTORY_MOVIES); file file = new file(path, "/" + dir_image2);        //String path = (Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM)+            //      file.separator+"TempGhost.jpg");//<---        BitmapFactory.Options options = new BitmapFactory.Options();//<---        options.inPreferredConfig = Bitmap.Config.ARGB_8888;//<---        bmp1 = BitmapFactory.decodefile(tmpfile.toString(), options);//<---        //THE lines ABOVE READ THE file WE SAVED BEFORE AND CONVERT IT INTO A BitMap        Camera_local_db.image.setimageBitmap(bmp1);        //camera_image.setimageBitmap(bmp1); //SETTING THE BitMap AS IMAGE IN AN IMAGEVIEW(SOMETHING                                    //liKE A BACKGROUNG FOR THE LAYOUT)       // TakeScreenshot();//CALliNG THIS METHOD TO TAKE A SCREENSHOT    }    };

解决方法:

您需要写入外部存储,确保添加了权限：

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

检查外部存储器是否可用于读写：

public boolean isExternalStorageWritable() {    String state = Environment.getExternalStorageState();    if (Environment.MEDIA_MOUNTED.equals(state)) {        return true;    }    return false;}

使用公共目录的根目录而不是使用AndroID的根目录.

如果要将公共文件保存在外部存储上,请使用getExternalStoragePublicDirectory()

public file getAlbumStorageDir(String albumname) {    // Get the directory for the user's public pictures directory.     file file = new file(Environment.getExternalStoragePublicDirectory(            Environment.DIRECTORY_DCIM), albumname);    if (!file.mkdirs()) {        Log.e(LOG_TAG, "Directory not created");    }    return file;}

如果要保存应用程序专用的文件,请使用getExternalfilesDir()

public file getAlbumStorageDir(Context context, String albumname) {    // Get the directory for the app's private pictures directory.     file file = new file(context.getExternalfilesDir(            Environment.DIRECTORY_DCIM), albumname);    if (!file.mkdirs()) {        Log.e(LOG_TAG, "Directory not created");    }    return file;}

有关链接http://developer.android.com/training/basics/data-storage/files.html的更多信息

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