今天遇到一個項目中用到Android 6.0的系統，但是有個文件是從Assert目錄下寫到SDCard中，但是AndroidMinifest.xml中已經加了文件的讀權限和寫權限，異常日志是在創建文件的時候報錯了。
在API23+以上
1 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 2 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
還要在Java代碼中請求權限：
1 // Storage Permissions
2 private static final int REQUEST_EXTERNAL_STORAGE = 1;
3 private static String[] PERMISSIONS_STORAGE = {
4 Manifest.permission.READ_EXTERNAL_STORAGE,
5 Manifest.permission.WRITE_EXTERNAL_STORAGE };
6
7 /**
8 * Checks if the app has permission to write to device storage
9 *
10 * If the app does not has permission then the user will be prompted to
11 * grant permissions
12 *
13 * @param activity
14 */
15 public static void verifyStoragePermissions(Activity activity) {
16 // Check if we have write permission
17 int permission = ActivityCompat.checkSelfPermission(activity,
18 Manifest.permission.WRITE_EXTERNAL_STORAGE);
19
20 if (permission != PackageManager.PERMISSION_GRANTED) {
21 // We don't have permission so prompt the user
22 ActivityCompat.requestPermissions(activity, PERMISSIONS_STORAGE,
23 REQUEST_EXTERNAL_STORAGE);
24 }
25 }