Android öffnen Externe Speicherverzeichnis ( SD-Karte ) zur Speicherung von Datei

? yuva ツ @ | Original: StackOverFlow
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Ich möchte auf externe Speicherverzeichnispfadfür das Speichern von Dateien programatically.I versucht, aber nicht immer sdcard Weg zu öffnen. Wie kann ich das tun? Gibt es eine Lösung für dieses Problem ??

private File path = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + "");

or

private File path = new File(Environment.getExternalStorageDirectory() + "");

Ich versuchte immer Weg von oben beider Methoden aber beide zeigen den internen Speicher.

Wenn wir Speicher öffnen, wenn SD-Karte wird es wird Shows wie unter- peresent  Android öffnen Externe Speicherverzeichnis ( SD-Karte ) zur Speicherung von Datei

Gerätespeicher & amp; SD-Speicherkarte .

Ich möchte SD-Speicherpfad durch Codierung zu bekommen. Ich habe die Berechtigungen in manifest- gegeben

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
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Top 5 Antwort

1Hafizh Herdi @

Try using

new File(Environment.getExternalStorageDirectory(),"somefilename");

Und vergessen Sie nicht, WRITE_EXTERNAL STORAGE und READ_EXTERNAL STORAGE Berechtigungen hinzufügen

2Farhan Shah @

hoffe, es ist für Sie gearbeitet :

File yourFile = new File(Environment.getExternalStorageDirectory(), "textarabics.txt");

Dies gibt u sdcard Pfad :

File path = Environment.getExternalStorageDirectory();

Try this:

String pathName = "/mnt/";

or try this:

String pathName = "/storage/";
3Doctoror Drive @

Der interne Speicher wird als " externer Speicher " in der API bezeichnet.

Wie in der Dokumentation erwähnt http://developer.android.com/reference/android/os/Environment.html#getExternalStorageDirectory%28%29

Hinweis: nicht zu verwechseln mit dem Wort "extern" werden hier . Dieses Verzeichnis kann besser als Medien / gemeinsam genutzten Speicher betrachtet werden. Es ist ein Dateisystem, das eine relativ große Menge an Daten aufnehmen kann, und das ist in allen Anwendungen ( keine Berechtigungen durchzusetzen ) geteilt. Traditionell ist dies eine SD-Karte, kann aber auch als integrierten Speicher in einem Gerät, das sich von dem geschützten internen Speicher ist und kann als ein Dateisystem auf einem Computer montiert werden umgesetzt.

Zu unterscheiden, ob " Environment.getExternalStorageDirectory ()" tatsächlich zurück physisch internen oder externen Speicher, rufen Environment.isExternalStorageEmulated (). Wenn es emuliert, als es intern . Bei neueren Geräten, die internen Speicher und SD-Karte Steckplatz Environment.getExternalStorageDirectory () immer den internen Speicher zurückzukehren. Während auf älteren Geräten, die nur SD-Karte als Speichermedien Option wird immer die SD-Karte zurückzukehren.

Es gibt keinen Weg, um alle Speicher mit aktuellen Android -API abrufen.

Ich habe einen Helfer erstellt auf Basis von Vitaliy Polchuk Methode in der folgenden Antwort

http://stackoverflow.com/questions/9340332/how-can-i-get-the-list-of-mounted-external-storage-of-android-device/19982338#19982338

HINWEIS: Starten KitKat Sekundärspeicher kann nur zugegriffen werden als schreibgeschützt, können Sie für die Beschreibbarkeit zu überprüfen mit dem folgenden Verfahren

/**
 * Checks whether the StorageVolume is read-only
 * 
 * @param volume
 *            StorageVolume to check
 * @return true, if volume is mounted read-only
 */
public static boolean isReadOnly(@NonNull final StorageVolume volume) {
    if (volume.mFile.equals(Environment.getExternalStorageDirectory())) {
        // is a primary storage, check mounted state by Environment
        return android.os.Environment.getExternalStorageState().equals(
                android.os.Environment.MEDIA_MOUNTED_READ_ONLY);
    } else {
        if (volume.getType() == Type.USB) {
            return volume.isReadOnly();
        }
        //is not a USB storagem so it's read-only if it's mounted read-only or if it's a KitKat device
        return volume.isReadOnly() || Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
    }
}

StorageHelper Klasse

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.StringTokenizer;

import android.os.Environment;

public final class StorageHelper {

    //private static final String TAG = "StorageHelper";

    private StorageHelper() {
    }

    private static final String STORAGES_ROOT;

    static {
        final String primaryStoragePath = Environment.getExternalStorageDirectory()
                .getAbsolutePath();
        final int index = primaryStoragePath.indexOf(File.separatorChar, 1);
        if (index != -1) {
            STORAGES_ROOT = primaryStoragePath.substring(0, index + 1);
        } else {
            STORAGES_ROOT = File.separator;
        }
    }

    private static final String[] AVOIDED_DEVICES = new String[] {
        "rootfs", "tmpfs", "dvpts", "proc", "sysfs", "none"
    };

    private static final String[] AVOIDED_DIRECTORIES = new String[] {
        "obb", "asec"
    };

    private static final String[] DISALLOWED_FILESYSTEMS = new String[] {
        "tmpfs", "rootfs", "romfs", "devpts", "sysfs", "proc", "cgroup", "debugfs"
    };

    /**
     * Returns a list of mounted {@link StorageVolume}s Returned list always
     * includes a {@link StorageVolume} for
     * {@link Environment#getExternalStorageDirectory()}
     * 
     * @param includeUsb
     *            if true, will include USB storages
     * @return list of mounted {@link StorageVolume}s
     */
    public static List<StorageVolume> getStorages(final boolean includeUsb) {
        final Map<String, List<StorageVolume>> deviceVolumeMap = new HashMap<String, List<StorageVolume>>();

        // this approach considers that all storages are mounted in the same non-root directory
        if (!STORAGES_ROOT.equals(File.separator)) {
            BufferedReader reader = null;
            try {
                reader = new BufferedReader(new FileReader("/proc/mounts"));
                String line;
                while ((line = reader.readLine()) != null) {
                    // Log.d(TAG, line);
                    final StringTokenizer tokens = new StringTokenizer(line, " ");

                    final String device = tokens.nextToken();
                    // skipped devices that are not sdcard for sure
                    if (arrayContains(AVOIDED_DEVICES, device)) {
                        continue;
                    }

                    // should be mounted in the same directory to which
                    // the primary external storage was mounted
                    final String path = tokens.nextToken();
                    if (!path.startsWith(STORAGES_ROOT)) {
                        continue;
                    }

                    // skip directories that indicate tha volume is not a storage volume
                    if (pathContainsDir(path, AVOIDED_DIRECTORIES)) {
                        continue;
                    }

                    final String fileSystem = tokens.nextToken();
                    // don't add ones with non-supported filesystems
                    if (arrayContains(DISALLOWED_FILESYSTEMS, fileSystem)) {
                        continue;
                    }

                    final File file = new File(path);
                    // skip volumes that are not accessible
                    if (!file.canRead() || !file.canExecute()) {
                        continue;
                    }

                    List<StorageVolume> volumes = deviceVolumeMap.get(device);
                    if (volumes == null) {
                        volumes = new ArrayList<StorageVolume>(3);
                        deviceVolumeMap.put(device, volumes);
                    }

                    final StorageVolume volume = new StorageVolume(device, file, fileSystem);
                    final StringTokenizer flags = new StringTokenizer(tokens.nextToken(), ",");
                    while (flags.hasMoreTokens()) {
                        final String token = flags.nextToken();
                        if (token.equals("rw")) {
                            volume.mReadOnly = false;
                            break;
                        } else if (token.equals("ro")) {
                            volume.mReadOnly = true;
                            break;
                        }
                    }
                    volumes.add(volume);
                }

            } catch (IOException ex) {
                ex.printStackTrace();
            } finally {
                if (reader != null) {
                    try {
                        reader.close();
                    } catch (IOException ex) {
                        // ignored
                    }
                }
            }
        }

        // remove volumes that are the same devices
        boolean primaryStorageIncluded = false;
        final File externalStorage = Environment.getExternalStorageDirectory();
        final List<StorageVolume> volumeList = new ArrayList<StorageVolume>();
        for (final Entry<String, List<StorageVolume>> entry : deviceVolumeMap.entrySet()) {
            final List<StorageVolume> volumes = entry.getValue();
            if (volumes.size() == 1) {
                // go ahead and add
                final StorageVolume v = volumes.get(0);
                final boolean isPrimaryStorage = v.file.equals(externalStorage);
                primaryStorageIncluded |= isPrimaryStorage;
                setTypeAndAdd(volumeList, v, includeUsb, isPrimaryStorage);
                continue;
            }
            final int volumesLength = volumes.size();
            for (int i = 0; i < volumesLength; i++) {
                final StorageVolume v = volumes.get(i);
                if (v.file.equals(externalStorage)) {
                    primaryStorageIncluded = true;
                    // add as external storage and continue
                    setTypeAndAdd(volumeList, v, includeUsb, true);
                    break;
                }
                // if that was the last one and it's not the default external
                // storage then add it as is
                if (i == volumesLength - 1) {
                    setTypeAndAdd(volumeList, v, includeUsb, false);
                }
            }
        }
        // add primary storage if it was not found
        if (!primaryStorageIncluded) {
            final StorageVolume defaultExternalStorage = new StorageVolume("", externalStorage, "UNKNOWN");
            defaultExternalStorage.mEmulated = Environment.isExternalStorageEmulated();
            defaultExternalStorage.mType =
                    defaultExternalStorage.mEmulated ? StorageVolume.Type.INTERNAL
                            : StorageVolume.Type.EXTERNAL;
            defaultExternalStorage.mRemovable = Environment.isExternalStorageRemovable();
            defaultExternalStorage.mReadOnly =
                    Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED_READ_ONLY);
            volumeList.add(0, defaultExternalStorage);
        }
        return volumeList;
    }

    /**
     * Sets {@link StorageVolume.Type}, removable and emulated flags and adds to
     * volumeList
     * 
     * @param volumeList
     *            List to add volume to
     * @param v
     *            volume to add to list
     * @param includeUsb
     *            if false, volume with type {@link StorageVolume.Type#USB} will
     *            not be added
     * @param asFirstItem
     *            if true, adds the volume at the beginning of the volumeList
     */
    private static void setTypeAndAdd(final List<StorageVolume> volumeList,
            final StorageVolume v,
            final boolean includeUsb,
            final boolean asFirstItem) {
        final StorageVolume.Type type = resolveType(v);
        if (includeUsb || type != StorageVolume.Type.USB) {
            v.mType = type;
            if (v.file.equals(Environment.getExternalStorageDirectory())) {
                v.mRemovable = Environment.isExternalStorageRemovable();
            } else {
                v.mRemovable = type != StorageVolume.Type.INTERNAL;
            }
            v.mEmulated = type == StorageVolume.Type.INTERNAL;
            if (asFirstItem) {
                volumeList.add(0, v);
            } else {
                volumeList.add(v);
            }
        }
    }

    /**
     * Resolved {@link StorageVolume} type
     * 
     * @param v
     *            {@link StorageVolume} to resolve type for
     * @return {@link StorageVolume} type
     */
    private static StorageVolume.Type resolveType(final StorageVolume v) {
        if (v.file.equals(Environment.getExternalStorageDirectory())
                && Environment.isExternalStorageEmulated()) {
            return StorageVolume.Type.INTERNAL;
        } else if (containsIgnoreCase(v.file.getAbsolutePath(), "usb")) {
            return StorageVolume.Type.USB;
        } else {
            return StorageVolume.Type.EXTERNAL;
        }
    }

    /**
     * Checks whether the array contains object
     * 
     * @param array
     *            Array to check
     * @param object
     *            Object to find
     * @return true, if the given array contains the object
     */
    private static <T> boolean arrayContains(T[] array, T object) {
        for (final T item : array) {
            if (item.equals(object)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Checks whether the path contains one of the directories
     * 
     * For example, if path is /one/two, it returns true input is "one" or
     * "two". Will return false if the input is one of "one/two", "/one" or
     * "/two"
     * 
     * @param path
     *            path to check for a directory
     * @param dirs
     *            directories to find
     * @return true, if the path contains one of the directories
     */
    private static boolean pathContainsDir(final String path, final String[] dirs) {
        final StringTokenizer tokens = new StringTokenizer(path, File.separator);
        while (tokens.hasMoreElements()) {
            final String next = tokens.nextToken();
            for (final String dir : dirs) {
                if (next.equals(dir)) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * Checks ifString contains a search String irrespective of case, handling.
     * Case-insensitivity is defined as by
     * {@link String#equalsIgnoreCase(String)}.
     * 
     * @param str
     *            the String to check, may be null
     * @param searchStr
     *            the String to find, may be null
     * @return true if the String contains the search String irrespective of
     *         case or false if not or {@code null} string input
     */
    public static boolean containsIgnoreCase(final String str, final String searchStr) {
        if (str == null || searchStr == null) {
            return false;
        }
        final int len = searchStr.length();
        final int max = str.length() - len;
        for (int i = 0; i <= max; i++) {
            if (str.regionMatches(true, i, searchStr, 0, len)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Represents storage volume information
     */
    public static final class StorageVolume {

        /**
         * Represents {@link StorageVolume} type
         */
        public enum Type {
            /**
             * Device built-in internal storage. Probably points to
             * {@link Environment#getExternalStorageDirectory()}
             */
            INTERNAL,

            /**
             * External storage. Probably removable, if no other
             * {@link StorageVolume} of type {@link #INTERNAL} is returned by
             * {@link StorageHelper#getStorages(boolean)}, this might be
             * pointing to {@link Environment#getExternalStorageDirectory()}
             */
            EXTERNAL,

            /**
             * Removable usb storage
             */
            USB
        }

        /**
         * Device name
         */
        public final String device;

        /**
         * Points to mount point of this device
         */
        public final File file;

        /**
         * File system of this device
         */
        public final String fileSystem;

        /**
         * if true, the storage is mounted as read-only
         */
        private boolean mReadOnly;

        /**
         * If true, the storage is removable
         */
        private boolean mRemovable;

        /**
         * If true, the storage is emulated
         */
        private boolean mEmulated;

        /**
         * Type of this storage
         */
        private Type mType;

        StorageVolume(String device, File file, String fileSystem) {
            this.device = device;
            this.file = file;
            this.fileSystem = fileSystem;
        }

        /**
         * Returns type of this storage
         * 
         * @return Type of this storage
         */
        public Type getType() {
            return mType;
        }

        /**
         * Returns true if this storage is removable
         * 
         * @return true if this storage is removable
         */
        public boolean isRemovable() {
            return mRemovable;
        }

        /**
         * Returns true if this storage is emulated
         * 
         * @return true if this storage is emulated
         */
        public boolean isEmulated() {
            return mEmulated;
        }

        /**
         * Returns true if this storage is mounted as read-only
         * 
         * @return true if this storage is mounted as read-only
         */
        public boolean isReadOnly() {
            return mReadOnly;
        }

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + ((file == null) ? 0 : file.hashCode());
            return result;
        }

        /**
         * Returns true if the other object is StorageHelper and it's
         * {@link #file} matches this one's
         * 
         * @see Object#equals(Object)
         */
        @Override
        public boolean equals(Object obj) {
            if (obj == this) {
                return true;
            }
            if (obj == null) {
                return false;
            }
            if (getClass() != obj.getClass()) {
                return false;
            }
            final StorageVolume other = (StorageVolume) obj;
            if (file == null) {
                return other.file == null;
            }
            return file.equals(other.file);
        }

        @Override
        public String toString() {
            return file.getAbsolutePath() + (mReadOnly ? " ro " : " rw ") + mType + (mRemovable ? " R " : "")
                    + (mEmulated ? " E " : "") + fileSystem;
        }
    }
}
4rijul gupta @

Ich hatte mit genau das gleiche Problem !

Um die interne SD-Karte erhalten Sie verwenden können,

String extStore = System.getenv("EXTERNAL_STORAGE");
File f_exts = new File(extStore);

Um die externe SD-Karte erhalten Sie verwenden können,

String secStore = System.getenv("SECONDARY_STORAGE");
File f_secs = new File(secStore);

Auf die Ausführung des Codes

 extStore = "/storage/emulated/legacy"
 secStore = "/storage/extSdCarcd"

funktioniert perfekt !