如何在Android应用程序中以编程方式格式化SD卡？

Question

How can i format the SD card inside the mobile by implementing the code for "formatting SD card" in an application? im currently using this code, but i cant get it to work.

    public void wipingSdcard(View view) {
        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) {
            e.printStackTrace();
        }
    }

    private 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();
                }
            }
        }
    }

And i am also using android:onClick="wipingSdcard" in my xml.code for the "format sd card" button.

What am i doing wrong?

Answer 1

Actually, you cannot format an SD Card by deleting all of its files and folders. Imagine that SD Card is unformatted, you can't just delete the files inside it, because the operating system doesn't know what filesystem it uses.

Answer 2

也包括这些权限。

MOUNT_FORMAT_FILESYSTEMS

MOUNT_UNMOUNT_FILESYSTEMS

Answer 3

Does wipeDirectory(tempFile.toString()); give the right parameter?

I mean, is tempFile.toString() the same as tempFile.getPath().toString() ? It could be this.