android-sdcard

问题 I am trying to open the SD card and upload a file in Android using Phonegap. Below is the code where I am appending the SD card content to my HTML, but nothing is displaying. I am using cordova.js , jquery1.7.1.js . Below is my code: My Javascript: function onDeviceReady() { getFileSystem(); } function getFileSystem() { window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem) { // success get file system root = fileSystem.root; listDir(root); }, function(evt) { // error

问题 I'm not sure what the source of the problem is - older android version with bug or if I'm doing something wrong, but my problem is that no matter what I do, android reports the SD card as mounted. Even if it's not physically in the tablet (archos 7o).. public boolean saveToDisk(String filename, String header) { /* first check to see if the SD card is mounted */ if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { //throw some exception so we can display an error

问题 I have constructed a simple query to find music on the sdcard of the Android emulator. I am using Android Studio. I placed 3 songs on the sdcard using adb push. However, the query is not finding the music files. Here is an image of the files on the sdcard in the Music folder: Here is the code that I am using to perform the query: ContentResolver musicResolver = getContentResolver(); Uri musicUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; Cursor musicCursor = musicResolver.query(musicUri,

问题 I have no problem with internal storage but I want to create a directory on the external SD card, with versions prior to KitKat, File.mkdirs() works. There is part of my code: //external sd card DocumentFile.fromFile(new File("/storage/sdcard1/")).exists(); //returns true DocumentFile.fromFile(new File("/storage/sdcard1/")).canRead(); //returns true DocumentFile.fromFile(new File("/storage/sdcard1/")).canWrite(); //returns true DocumentFile.fromFile(new File("/storage/sdcard1/test")).exists()

问题 Is there any way to get the absolute path from specific Folders & Files located in the removable SD-card, using the Storage Access Framework (SAF)? Thanks 回答1: No, and even if you could, you would not be able to access them, unless they happened to be in one of the couple of locations on removable media for which you have read access (e.g., getExternalFilesDirs() ). The Storage Access Framework returns Uri values pointing to documents. Use ContentResolver and methods like openInputStream() to

问题 I get a "Permission denied" error, when I want to create a file on my external SD-Card (named /storage/B9BE-18A6). I know that you have to ask for the write permission programmatically since Android M. So I inserted the solution from Arpit Patel (Android 6.0 Marshmallow. Cannot write to SD Card) I don't know why I still haven't the permissions to do it. Do you guys have another solution that I can create files on my SD-Card? Code for creating the file FloatingActionButton fab_new_file =

问题 I have implemented an application for get the images from external storage when user click on a image button.if user click on a button i can get the images from sd card.but i can't view the slide show for get the images on by one there.I have implemented code as follows: ((ImageView)findViewById(R.id.getImage)).setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(); intent.setType("image/*"); intent.setAction(Intent.ACTION_GET_CONTENT);

问题 What is a better algorithm on loading or populating images from SD CARD, than storing each image path as Constants? public final class Constants { public static final String[] IMAGES = new String[] { // Heavy images "file:///mnt/sdcard/folder/folder/folder/1.jpg", "file:///mnt/sdcard/folder/folder/folder/2.jpg", "file:///mnt/sdcard/folder/folder/folder/3.jpg", "file:///mnt/sdcard/folder/4.jpg", ); } Basically I am learning the Universal Image Loader, and focusing on the grid view

问题 I am aware about changes in Access to SD card introduced by Google with Android 4.4. However in my application I need to be able to store data on some removable /secondary sd card. When I create the application folder (app.xyz.com) on the secondary using default file manager then I am able to create dirs and files inside. But by default such dir dosen't exist on secondary sd card. So, I would like to create the application specific dir programmatically inside my application… Do you have any

问题 I am using StorageVolume API to retrieve URI for both SDCard and USBStorage by following StorageManager storageManager = (StorageManager) getSystemService(STORAGE_SERVICE); for (StorageVolume storageVolume : storageManager.getStorageVolumes()) { if (!storageVolume.isPrimary()) { Intent accessIntent = storageVolume.createAccessIntent(null); startActivityForResult(accessIntent, 11); } } In onActivityResult I am able to retrieve the URI, saving it to the SharedPreferences and taking Persisting