Android SD卡檢測錯誤

Question

當您從Android設備中刪除SD卡時，我擁有應執行的代碼（據了解，通過刪除，該用戶選擇從Android設備菜單或配置中選擇remove ，就像您從其他系統中刪除USB設備或SD卡一樣） ，然后以物理方式取出卡）：

public void kartkontrol()
{
    String state = android.os.Environment.getExternalStorageState();
    if (state.equals(android.os.Environment.MEDIA_MOUNTED))
    {
        // We can read and write the media
        Durum=" Hafıza Kartı Var    (Okuma/Yazma)";

    }
    else if (android.os.Environment.MEDIA_MOUNTED_READ_ONLY.equals(state))
    {
        // We can only read the media
        Durum=" Hafıza Kartı Var     (Okuma İzni)";
    }
    else
    {
        // No external media

        Durum=" Hafıza Kartı Yok";
    }
}

應該卸載並卸下Card，但似乎在此過程中實際上已經安裝了Card。

我究竟做錯了什么？

Answer 1

您可以在Android文檔中找到更多信息。

這里有一篇不錯的文章 ，談論通過USB檢測已安裝的SD卡。

您也可以改用這種有用的方法：

static public boolean hasStorage(boolean requireWriteAccess) {
    //TODO: After fix the bug,  add "if (VERBOSE)" before logging errors.
    String state = Environment.getExternalStorageState();
    Log.v(TAG, "storage state is " + state);

    if (Environment.MEDIA_MOUNTED.equals(state)) {
        if (requireWriteAccess) {
            boolean writable = checkFsWritable();
            Log.v(TAG, "storage writable is " + writable);
            return writable;
        } else {
            return true;
        }
    } else if (!requireWriteAccess && Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        return true;
    }
    return false;
}

Answer 2

我在卸下卡時已安裝了密碼，但必須將其卸下。 我用另一個代碼解決了這個問題。 運行順利。 沒問題

    sSDpath = null;
        fileCur = null;


for (String sPathCur : Arrays.asList("ext_card", "external_sd", "ext_sd", "external","extSdCard", "externalSdCard")) // external sdcard
        {
            fileCur = new File("/mnt/", sPathCur);
            if (fileCur.isDirectory() && fileCur.canWrite()) {
                sSDpath = fileCur.getAbsolutePath();

                kartk.setText("Hafıza Kartı Takılı");
                Toast.makeText(getApplicationContext(), "kkkBirinci", Toast.LENGTH_LONG).show();
                break;
            }
        }
        fileCur = null;
        if (sSDpath == null) {

            sSDpath = Environment.getExternalStorageDirectory().getAbsolutePath();

            kartk.setText("Hafıza Kartı Takılı Değil");
            Toast.makeText(getApplicationContext(), "kkkikinci", Toast.LENGTH_LONG).show();
        }