File photo = createCaptureFile(encodingType);
        if (Build.VERSION.SDK_INT >= 24) {
            this.imageUri = new CordovaUri(FileProvider.getUriForFile(cordova.getActivity(),
                    applicationId + ".provider",
                    photo));
        } else {
            this.imageUri = new CordovaUri(Uri.fromFile(photo));
        }

        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri.getCorrectUri());
        //We can write to this URI, this will hopefully allow us to write files to get to the next step
        intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

    private File createCaptureFile(int encodingType) {
        return createCaptureFile(encodingType, "");
    }

    /**
     * Create a file in the applications temporary directory based upon the supplied encoding.
     *
     * @param encodingType of the image to be taken
     * @param fileName     or resultant File object.
     * @return a File object pointing to the temporary picture
     */
    private File createCaptureFile(int encodingType, String fileName) {
        if (fileName.isEmpty()) {
            fileName = ".Pic";
        }

        if (encodingType == JPEG) {
            fileName = fileName + ".jpg";
        } else if (encodingType == PNG) {
            fileName = fileName + ".png";
        } else {
            throw new IllegalArgumentException("Invalid Encoding Type: " + encodingType);
        }

//        File.createTempFile()
        File file = new File(getTempDirectoryPath(), fileName);

        if (!file.exists()){
            File dir = new File(file.getParent());
            dir.mkdirs();
            try {
                file.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

        return file;
    }

  private String getTempDirectoryPath() {
        File cache = null;

        // SD Card Mounted
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            cache = cordova.getActivity().getExternalCacheDir();
        }
        // Use internal storage
        else {
            cache = cordova.getActivity().getCacheDir();
        }

        // Create the cache directory if it doesn't exist
        cache.mkdirs();
        return cache.getAbsolutePath();
    }

權限已開，但是部分手機外部存儲上寫入時會失敗。在getTempDirectoryPath（）中cache.mkdirs()返回false，即創(chuàng)建路徑不成功，以至于createCaptureFile（）中return file 中 的file.exists()=false。當調(diào)用相機的時候，F(xiàn)ile photo不存在。解決辦法：在創(chuàng)建文件時，判斷文件是否存在，不存在，new出來。如下：

    private File createCaptureFile(int encodingType, String fileName) {
        if (fileName.isEmpty()) {
            fileName = ".Pic";
        }

        if (encodingType == JPEG) {
            fileName = fileName + ".jpg";
        } else if (encodingType == PNG) {
            fileName = fileName + ".png";
        } else {
            throw new IllegalArgumentException("Invalid Encoding Type: " + encodingType);
        }

//        File.createTempFile()
        File file = new File(getTempDirectoryPath(), fileName);

        if (!file.exists()){
            File dir = new File(file.getParent());
            dir.mkdirs();
            try {
                file.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

        return file;
    }