問題描述

事情應該很簡單，但在大多數情況下，在 Android 中并非如此.如果用戶在我的應用程序中選擇該選項，我需要格式化 SD 卡.如果它已經在操作系統中，不要問我為什么需要這樣做......不切實際，但這是我需要實現的要求.您可能知道，設置存儲擦除SD卡中有一個選項.我看了一下 froyo 源代碼，它是這樣的:

Things should be simple, but as most of the time, in Android, aren't. I need to format the SD card if the user selects the option in my app. Don't ask me why I need to do this if it's already in the OS... not practical but it's a requirement that I need to implement. As you may know, there is an option in Settings Storage Erase SD Card. I took a look at the froyo source code and it's something like:

final IMountService service =
         IMountService.Stub.asInterface(ServiceManager.getService("mount"));
        if (service != null) {
            new Thread() {
                public void run() {
                try {
                        service.formatVolume(Environment.getExternalStorageDirectory().toString());
                    } catch (Exception e) {
                        // Intentionally blank - there's nothing we can do here
                    Log.w("MediaFormat", "Unable to invoke IMountService.formatMedia()");
                    }
                }
            }.start();
        } else {
            Log.w("MediaFormat", "Unable to locate IMountService");
        }

它使用 android.os.storage.IMountService 和 android.os.ServiceManager 我似乎無法訪問它.因此，正如我所見，我可以遞歸地搜索每個文件并將其刪除，但這不合我的口味"......或者我可以從擦除 SD 卡開始屏幕給用戶.

It uses android.os.storage.IMountService and android.os.ServiceManager and I don't seem to have access to it. So, as I see it I could recursively search every file and delete it but that would be "not on my taste"... or I could start the screen from Erase SD card to the user.

任何幫助都更受歡迎，因為我被困住了.

Any help is more then welcome, as I am stuck.

推薦答案

我在這里找不到關于 SO 的問題，但它有一個可行的解決方案.所以所有的功勞都歸于那個人；)

I can't find again the question here on SO, but It had a working solution. So all credit goes to that guy ;)

public void wipeMemoryCard() {
        File deleteMatchingFile = new File(Environment
                .getExternalStorageDirectory().toString());
        try {
            File[] filenames = deleteMatchingFile.listFiles();
            if (filenames != null && filenames.length > 0) {
                for (File tempFile : filenames) {
                    if (tempFile.isDirectory()) {
                        wipeDirectory(tempFile.toString());
                        tempFile.delete();
                    } else {
                        tempFile.delete();
                    }
                }
            } else {
                deleteMatchingFile.delete();
            }
        } catch (Exception e) {
            Utils.log(e.getMessage());
        }
    }

    private static void wipeDirectory(String name) {
        File directoryFile = new File(name);
        File[] filenames = directoryFile.listFiles();
        if (filenames != null && filenames.length > 0) {
            for (File tempFile : filenames) {
                if (tempFile.isDirectory()) {
                    wipeDirectory(tempFile.toString());
                    tempFile.delete();
                } else {
                    tempFile.delete();
                }
            }
        } else {
            directoryFile.delete();
        }
    }

這篇關于在 Android 中格式化 SD 卡的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！