Question

尝试将图像保存到外部存储并获取上述异常。已阅读并尝试了不同的方法（在代码中注释掉）但没有任何工作：

java.io.FileNotFoundException: /storage/emulated/0/Pictures/saved_images/image0.jpg: open failed: ENOENT (No such file or directory)

代码：

// check if ext storage is available to write
        String state = Environment.getExternalStorageState();
        if (Environment.MEDIA_MOUNTED.equals(state)) {
            // media available
            canSaveToExternalSD = true;
            // String root =
            // Environment.getExternalStorageDirectory().toString();
            /*
             * String root = Environment.getExternalStoragePublicDirectory
             * (Environment.DIRECTORY_PICTURES).toString() ;
             */
            // String root =
            // Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)
            // + File.separator + diveAlbum;

            String root = Environment.getExternalStoragePublicDirectory(
                    Environment.DIRECTORY_PICTURES).toString()
                    + "/saved_images";
            File myDir = new File(root);
            myDir.mkdirs();
            if (!myDir.exists()) {
                makeToast("Directory does not exists: " + myDir);
                Log.d(TAG, "Dir does not exist!");
            }
            String photoName = "image" + diveNum + ".jpg";
            File file = new File(root + "/" + photoName);
            // File file = new File(myDir,photoName);
            if (file.exists()) {
                file.delete();
                makeToast("Name already exists!");
            }

            try {
                FileOutputStream out = new FileOutputStream(file);
                image.compress(Bitmap.CompressFormat.JPEG, 90, out);// compress
                                                                    // image fro
                                                                    // output
                out.flush();
                out.close();

创建FileOutputStream时抛出的异常，建议表示赞赏。夏兰

Answer 1

知道了。已经将READ_EXTERNAL_STORAGE添加到清单而不是WRITE_EXTERNAL_STORAGE权限，没有任何2天的头部划痕无法修复。

Answer 2

您可以根据需要修改此代码：

final public class FileHandler {
    final private File folderCreatedDir;
    final private String folderToCreate;
    final private Map<String, String> mapNameToContents;

    public FileHandler(File baseDirectory, String folderToCreate,
            Map<String, String> mapNameToContents) {
        this.folderCreatedDir = new File(baseDirectory + File.separator
                + folderToCreate);
        this.folderToCreate = folderToCreate;
        this.mapNameToContents = mapNameToContents;
    }

    private final void createFolder() {
        folderCreatedDir.mkdir();

    }

    private final void writeMapContents() throws IOException {
        Set<String> keySet = mapNameToContents.keySet();
        for (String key : keySet) {
            writeContents(key, mapNameToContents.get(key));
        }

    }

    private final void writeContents(String key, String contents)
            throws IOException {
        File file = new File(folderCreatedDir + File.separator + key);
        FileOutputStream fileOutput = new FileOutputStream(file);
        if (file.canWrite()) {
            fileOutput.write(contents.getBytes());
            fileOutput.close();
        }
    }

    public void writeAllContents() throws IOException {
        createFolder();
        writeMapContents();
    }

    public StringBuilder getContents(String key) throws IOException {
        BufferedReader rd = new BufferedReader(new FileReader(folderCreatedDir
                + File.separator + key));
        String line = "";
        StringBuilder htmlBuilder = new StringBuilder();
        long bytesRead = 0;
        while ((line = rd.readLine()) != null) {
            htmlBuilder.append(line);
            bytesRead = bytesRead + line.getBytes().length + 2;
        }
        return htmlBuilder;
    }
}

如果您使用方法，它可以帮助您将代码分解为更小的部分。此外，我建议使其更加面向对象，它将帮助您更好地可视化代码。

找不到文件异常将图像保存到外部存储

2 个答案: