GetExternalStorageDirectory () for getExternalFilesDir ()

Question

So basically I have this code (all mberhman File Explorer credits - https://github.com/mburman/Android-File-Explore ):

private File path = new File(Environment.getExternalStorageDirectory() + ""); protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.start); loadFileList(); showDialog(DIALOG_LOAD_FILE); Log.d(TAG, path.getAbsolutePath()); readDir = (Button) findViewById(R.id.btnReadDirectory); readDir.setOnClickListener(this); } private void loadFileList() { try { path.mkdirs(); } catch (SecurityException e) { Log.e(TAG, "unable to write on the sd card "); } if (path.exists()) { FilenameFilter filter = new FilenameFilter() { @Override public boolean accept(File dir, String filename) { // TODO Auto-generated method stub File sel = new File(dir, filename); // Filters based on whether the file is hidden or not return (sel.isFile() || sel.isDirectory()) && !sel.isHidden(); } }; String[] fList = path.list(filter); fileList = new Item[fList.length]; for (int i = 0; i < fList.length; i++) { fileList[i] = new Item(fList[i], R.drawable.file_icon); File sel = new File(path, fList[i]); if (sel.isDirectory()) { fileList[i].icon = R.drawable.directory_icon; Log.d("DIRECTORY", fileList[i].file); } else { Log.d("FILE", fileList[i].file); } } if (!firstLvl) { Item temp[] = new Item[fileList.length + 1]; for (int i = 0; i < fileList.length; i++) { temp[i + 1] = fileList[i]; } temp[0] = new Item("Up", R.drawable.directory_up); fileList = temp; } } else { Log.e(TAG, "path does not exist"); UIHelper.displayText(this, R.id.tvPath, "Path does not exist"); } adapter = new ArrayAdapter<Item>(this, android.R.layout.select_dialog_item, android.R.id.text1, fileList) { @Override public View getView(int position, View convertView, ViewGroup parent) { View view = super.getView(position, convertView, parent); TextView textView = (TextView) view .findViewById(android.R.id.text1); textView.setCompoundDrawablesWithIntrinsicBounds( fileList[position].icon, 0, 0, 0); int dp5 = (int) (5 * getResources().getDisplayMetrics().density + 0.5f); textView.setCompoundDrawablePadding(dp5); return view; } }; } 

I apologize for this. I just want to ask why this is not possible by changing the file path:

 File path = getExternalFilesDir(null); 

or how to do it so that I can store my files on my backup external SD card.

Answer 1

In principle, this is possible, but the location of the external storage for your application differs on different devices (mainly because some devices have an external component as part of the built-in storage). I took the code below somewhere on SO, and it works for me:

 private File getAbsoluteFile(String relativePath, Context context) { if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) { return new File(context.getExternalFilesDir(null), relativePath); } else { return new File(context.getFilesDir(), relativePath); } }