③創(chuàng)建二維碼文件存儲(chǔ)目錄

private static String getFileRoot(Context context) {        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            File external = context.getExternalFilesDir(null);            if (external != null) {                return external.getAbsolutePath();            }        }        return context.getFilesDir().getAbsolutePath();    }

④創(chuàng)建數(shù)據(jù)庫(kù)工具類來(lái)存儲(chǔ)臨時(shí)數(shù)據(jù)

public class SPUtil {    private static final String CONFIG = "config";    /**     * 獲取SharedPreferences實(shí)例對(duì)象     *     * @param fileName     */    private static SharedPreferences getSharedPreference(String fileName) {        return QRCodeApplication.getInstance().getSharedPreferences(fileName, Context.MODE_PRIVATE);    }    /**     * 保存一個(gè)String類型的值！     */    public static void
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