CODEWITHSUNDEEP
androidandroid-sdcard
user6112961
user6112961

Reputation:

Writing to SD Card in android always returning False

Hi guys i have to copy my sqlite db to downloads with the code bellow. But if (sd.canWrite()) always returning false... Im stuck on this , and yes im already added to my manifest. Im debuging on real device not the virtual one. Ty for help 

private void copyDbToExternal(Context context) {
    try {
        File sd = Environment.getExternalStorageDirectory();
        File data = Environment.getDataDirectory();

        if (sd.canWrite()){
            String currentDBPath = "//data//data//" + context.getApplicationContext().getPackageName() + "//databases//"
                    + "qamatrisdb";
            String backupDBPath = "qamatrisdb";
            File currentDB = new File(data, currentDBPath);
            File backupDB = new File(sd, backupDBPath);

            FileChannel src = new FileInputStream(currentDB).getChannel();
            FileChannel dst = new FileOutputStream(backupDB).getChannel();
            dst.transferFrom(src, 0, src.size());
            src.close();
            dst.close();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Upvotes: 1

Views: 1253

Answers (2)

Izoman
Izoman

Reputation: 51

Did you try using tutorial on Dev.Android?

http://developer.android.com/training/basics/data-storage/files.html

Example for accessing external storage:

/* Checks if external storage is available for read and write */
public boolean isExternalStorageWritable() {
    String state = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(state)) {
        return true;
    }
    return false;
}

/* Checks if external storage is available to at least read */
public boolean isExternalStorageReadable() {
    String state = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(state) ||
        Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        return true;
    }
    return false;
}

Upvotes: 1

CommonsWare
CommonsWare

Reputation: 1006944

Your code has nothing to do with an SD card. Your code is writing to external storage, not removable storage.

If canWrite() is returning false, you may be missing the WRITE_EXTERNAL_STORAGE permission, or you may have targetSdkVersion set to 23 or higher and are not handling Android 6.0+ runtime permissions.

Also, please replace your existing currentDBPath logic with a call to getDatabasePath().

Upvotes: 1

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