[安卓]在內存卡建立文件夾

來源：大牛直播內部代碼

請求權限：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

 

代碼：

/**
 * 根據目錄建立文件夾
 * @param context
 * @param cacheDir
 * @return
 */
public static File getOwnCacheDirectory(Context context, String cacheDir) {
    File appCacheDir = null;
    //判斷sd卡正常掛載而且擁有權限的時候建立文件
    if ( Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) && hasExternalStoragePermission(context)) {
        appCacheDir = new File(Environment.getExternalStorageDirectory(), cacheDir);
        Log.i(TAG, "appCacheDir: " + appCacheDir);
    }
    if (appCacheDir == null || !appCacheDir.exists() && !appCacheDir.mkdirs()) {
        appCacheDir = context.getCacheDir();
    }
    return appCacheDir;
}

/**
 * 檢查是否有權限
 * @param context
 * @return
 */
private static boolean hasExternalStoragePermission(Context context) {
    int perm = context.checkCallingOrSelfPermission("android.permission.WRITE_EXTERNAL_STORAGE");
    return perm == 0;
}