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    <p>example of create read and write file sdcard.</p> <pre><code>public class ReadWriteSDCardFile extends Activity { private static final String LOGTAG = "FileStorage"; private TextView readOutput; @Override public void onCreate(final Bundle icicle) { super.onCreate(icicle); this.setContentView(R.layout.read_write_sdcard_file); this.readOutput = (TextView) findViewById(R.id.readwritesd_output); String fileName = "testfile-" + System.currentTimeMillis() + ".txt"; // create structure /sdcard/unlocking_android and then WRITE File sdDir = new File("/sdcard/"); if (sdDir.exists() &amp;&amp; sdDir.canWrite()) { File uadDir = new File(sdDir.getAbsolutePath() + "/unlocking_android"); uadDir.mkdir(); if (uadDir.exists() &amp;&amp; uadDir.canWrite()) { File file = new File(uadDir.getAbsolutePath() + "/" + fileName); try { file.createNewFile(); } catch (IOException e) { Log.e(ReadWriteSDCardFile.LOGTAG, "error creating file", e); } // now that we have the structure we want, write to the file if (file.exists() &amp;&amp; file.canWrite()) { FileOutputStream fos = null; try { fos = new FileOutputStream(file); fos.write("I fear you speak upon the rack, where men enforced do speak anything.".getBytes()); } catch (FileNotFoundException e) { Log.e(ReadWriteSDCardFile.LOGTAG, "ERROR", e); } catch (IOException e) { Log.e(ReadWriteSDCardFile.LOGTAG, "ERROR", e); } finally { if (fos != null) { try { fos.flush(); fos.close(); } catch (IOException e) { // swallow } } } } else { Log.e(ReadWriteSDCardFile.LOGTAG, "error writing to file"); } } else { Log.e(ReadWriteSDCardFile.LOGTAG, "ERROR, unable to write to /sdcard/unlocking_android"); } } else { Log .e( ReadWriteSDCardFile.LOGTAG, "ERROR, /sdcard path not available " + "(did you create an SD image with the mksdcard tool, and start emulator with -sdcard &lt;path_to_file&gt; option?"); } // READ File rFile = new File("/sdcard/unlocking_android/" + fileName); if (rFile.exists() &amp;&amp; rFile.canRead()) { FileInputStream fis = null; try { fis = new FileInputStream(rFile); byte[] reader = new byte[fis.available()]; while (fis.read(reader) != -1) { } this.readOutput.setText(new String(reader)); } catch (IOException e) { Log.e(ReadWriteSDCardFile.LOGTAG, e.getMessage(), e); } finally { if (fis != null) { try { fis.close(); } catch (IOException e) { // swallow } } } } else { this.readOutput.setText("Unable to read/write sdcard file, see logcat output"); } } </code></pre> <p>}</p>
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    1. POAndroid: Files that I write to the sdcard do not show in Windows explorer, for Acer Iconiatab
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    1. COSorry if I wasn't clear in my question. I know how to write to the sdcard; when I write to the Sdcard, everything works as expected for my Samsung Galaxy 2.2, but not for my Acer AconiaTab 3.0. For the AconiaTab, my created files do not show in Windows explorer, when the device is connected by USB.
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