Android 没有在SD卡上写入的权限

我正在拼命寻找我的代码中的错误，如果有人能帮我解决这个问题，我将不胜感激。 我正在尝试将图像保存到三星Galaxy Tab s2的SD卡上 但无论我使用什么代码，我似乎都无法对SD卡进行任何更改

下面这段代码说明，尽管清单中有更改，但我没有在SD卡上写入数据的权限

有没有人有同样的问题或者知道这里发生了什么

（android:minSdkVersion=“19”；android:targetSdkVersion=“25”）

代码：

舱单：

<manifest

xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ma.singhalja.saveimage">

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

<application

---

添加访问的运行时权限

Add library:
compile 'pub.devrel:easypermissions:0.2.1'

private String[] galleryPermissions = {Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE};

if (EasyPermissions.hasPermissions(this, galleryPermissions)) {
        pickImageFromGallery();
    } else {
        EasyPermissions.requestPermissions(this, "Access for storage",
                101, galleryPermissions);
    }

---

您必须为此处理运行时权限，请查看以下步骤

复制此类：

    public class PermissionHandler {


// Run Time Permission List
        private static final String MNC = "MNC";

        // Calendar group.
        public static final String READ_CALENDAR = Manifest.permission.READ_CALENDAR;
        public static final String WRITE_CALENDAR = Manifest.permission.WRITE_CALENDAR;

        // Camera group.
        public static final String CAMERA = Manifest.permission.CAMERA;

        // Contacts group.
        public static final String READ_CONTACTS = Manifest.permission.READ_CONTACTS;
        public static final String WRITE_CONTACTS = Manifest.permission.WRITE_CONTACTS;


        // Location group.
        public static final String ACCESS_FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
        public static final String ACCESS_COARSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION;

        // Microphone group.
        public static final String RECORD_AUDIO = Manifest.permission.RECORD_AUDIO;

        // Phone group.
        public static final String READ_PHONE_STATE = Manifest.permission.READ_PHONE_STATE;
        public static final String CALL_PHONE = Manifest.permission.CALL_PHONE;
        public static final String READ_CALL_LOG = Manifest.permission.READ_CALL_LOG;
        public static final String WRITE_CALL_LOG = Manifest.permission.WRITE_CALL_LOG;
        public static final String ADD_VOICEMAIL = Manifest.permission.ADD_VOICEMAIL;
        public static final String USE_SIP = Manifest.permission.USE_SIP;
        public static final String PROCESS_OUTGOING_CALLS = Manifest.permission.PROCESS_OUTGOING_CALLS;

        // Sensors group.
        public static final String BODY_SENSORS = Manifest.permission.BODY_SENSORS;
        public static final String USE_FINGERPRINT = Manifest.permission.USE_FINGERPRINT;

        // SMS group.
        public static final String SEND_SMS = Manifest.permission.SEND_SMS;
        public static final String RECEIVE_SMS = Manifest.permission.RECEIVE_SMS;
        public static final String READ_SMS = Manifest.permission.READ_SMS;
        public static final String RECEIVE_WAP_PUSH = Manifest.permission.RECEIVE_WAP_PUSH;
        public static final String RECEIVE_MMS = Manifest.permission.RECEIVE_MMS;
        public static final String READ_CELL_BROADCASTS = "android.permission.READ_CELL_BROADCASTS";

        // Bookmarks group.
        public static final String READ_HISTORY_BOOKMARKS = "com.android.browser.permission.READ_HISTORY_BOOKMARKS";
        public static final String WRITE_HISTORY_BOOKMARKS = "com.android.browser.permission.WRITE_HISTORY_BOOKMARKS";


        public static boolean isPermissionGranted(Activity mContext, String Permission, String Text, int PermissionCode) {

            if (ContextCompat.checkSelfPermission(mContext, Permission) != PackageManager.PERMISSION_GRANTED) {
                reqPermission(mContext, Text, PermissionCode, Permission);
                return false;
            }

            return true;
        }


        public static void reqPermission(Activity mContext, String Text, int PermissionCode, String Permission) {
            if (!ActivityCompat.shouldShowRequestPermissionRationale(mContext, Permission)) {
                ActivityCompat.requestPermissions(mContext, new String[]{Permission}, PermissionCode);
            } else {
                openAlertDialog(mContext, Text);
            }
        }

        public static void openAlertDialog(final Context mContext, String Text) {

            new AlertDialog.Builder(mContext)
                    .setTitle("Permission")
                    .setMessage(mContext.getResources().getString(R.string.app_name) + " needs to access " + Text + " Permission for using this features from Setting >> Permissions.")
                    .setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            // Your code
                            String packageName = "you.App.Id";
                            try {
                                //Open the specific App Info page:
                                Intent intent = new Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                                intent.setData(Uri.parse("package:" + packageName));
                                mContext.startActivity(intent);

                            } catch (ActivityNotFoundException e) {
                                //e.printStackTrace();
                                //Open the generic Apps page:
                                Intent intent = new Intent(android.provider.Settings.ACTION_MANAGE_APPLICATIONS_SETTINGS);
                                mContext.startActivity(intent);

                            }

                        }
                    })
                    .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            // do nothing
                        }
                    })
                    .show();


        }

    }

在保存图像之前，您需要检查此项

if (PermissionHandler.isPermissionGranted((Activity) mContext, Manifest.permission.WRITE_EXTERNAL_STORAGE, "External Storage", 1000)) {
                        // Save your Image code
                    }

---

就是这样。快乐编码：）

您添加运行时权限了吗？

    public class PermissionHandler {


// Run Time Permission List
        private static final String MNC = "MNC";

        // Calendar group.
        public static final String READ_CALENDAR = Manifest.permission.READ_CALENDAR;
        public static final String WRITE_CALENDAR = Manifest.permission.WRITE_CALENDAR;

        // Camera group.
        public static final String CAMERA = Manifest.permission.CAMERA;

        // Contacts group.
        public static final String READ_CONTACTS = Manifest.permission.READ_CONTACTS;
        public static final String WRITE_CONTACTS = Manifest.permission.WRITE_CONTACTS;


        // Location group.
        public static final String ACCESS_FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
        public static final String ACCESS_COARSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION;

        // Microphone group.
        public static final String RECORD_AUDIO = Manifest.permission.RECORD_AUDIO;

        // Phone group.
        public static final String READ_PHONE_STATE = Manifest.permission.READ_PHONE_STATE;
        public static final String CALL_PHONE = Manifest.permission.CALL_PHONE;
        public static final String READ_CALL_LOG = Manifest.permission.READ_CALL_LOG;
        public static final String WRITE_CALL_LOG = Manifest.permission.WRITE_CALL_LOG;
        public static final String ADD_VOICEMAIL = Manifest.permission.ADD_VOICEMAIL;
        public static final String USE_SIP = Manifest.permission.USE_SIP;
        public static final String PROCESS_OUTGOING_CALLS = Manifest.permission.PROCESS_OUTGOING_CALLS;

        // Sensors group.
        public static final String BODY_SENSORS = Manifest.permission.BODY_SENSORS;
        public static final String USE_FINGERPRINT = Manifest.permission.USE_FINGERPRINT;

        // SMS group.
        public static final String SEND_SMS = Manifest.permission.SEND_SMS;
        public static final String RECEIVE_SMS = Manifest.permission.RECEIVE_SMS;
        public static final String READ_SMS = Manifest.permission.READ_SMS;
        public static final String RECEIVE_WAP_PUSH = Manifest.permission.RECEIVE_WAP_PUSH;
        public static final String RECEIVE_MMS = Manifest.permission.RECEIVE_MMS;
        public static final String READ_CELL_BROADCASTS = "android.permission.READ_CELL_BROADCASTS";

        // Bookmarks group.
        public static final String READ_HISTORY_BOOKMARKS = "com.android.browser.permission.READ_HISTORY_BOOKMARKS";
        public static final String WRITE_HISTORY_BOOKMARKS = "com.android.browser.permission.WRITE_HISTORY_BOOKMARKS";


        public static boolean isPermissionGranted(Activity mContext, String Permission, String Text, int PermissionCode) {

            if (ContextCompat.checkSelfPermission(mContext, Permission) != PackageManager.PERMISSION_GRANTED) {
                reqPermission(mContext, Text, PermissionCode, Permission);
                return false;
            }

            return true;
        }


        public static void reqPermission(Activity mContext, String Text, int PermissionCode, String Permission) {
            if (!ActivityCompat.shouldShowRequestPermissionRationale(mContext, Permission)) {
                ActivityCompat.requestPermissions(mContext, new String[]{Permission}, PermissionCode);
            } else {
                openAlertDialog(mContext, Text);
            }
        }

        public static void openAlertDialog(final Context mContext, String Text) {

            new AlertDialog.Builder(mContext)
                    .setTitle("Permission")
                    .setMessage(mContext.getResources().getString(R.string.app_name) + " needs to access " + Text + " Permission for using this features from Setting >> Permissions.")
                    .setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            // Your code
                            String packageName = "you.App.Id";
                            try {
                                //Open the specific App Info page:
                                Intent intent = new Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                                intent.setData(Uri.parse("package:" + packageName));
                                mContext.startActivity(intent);

                            } catch (ActivityNotFoundException e) {
                                //e.printStackTrace();
                                //Open the generic Apps page:
                                Intent intent = new Intent(android.provider.Settings.ACTION_MANAGE_APPLICATIONS_SETTINGS);
                                mContext.startActivity(intent);

                            }

                        }
                    })
                    .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            // do nothing
                        }
                    })
                    .show();


        }

    }

if (PermissionHandler.isPermissionGranted((Activity) mContext, Manifest.permission.WRITE_EXTERNAL_STORAGE, "External Storage", 1000)) {
                        // Save your Image code
                    }