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POWriting to and Reading from a file in Android
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  1. POWriting to and Reading from a file in Android
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    copied!<p>I am having a hard time figuring out how to write to and read from files on an Android device. The file will be formatted as XML and I already have parsers and data structures built that can format the XML into objects and objects into XML, but the last hurdle is reading the XML from a non-resource file (I know the data structures work because I it works when reading from a resource file) and also writing to a non-resource file. I am terrible at using tools to debug (not sure how to print a stack trace) but I know for a fact the problem is that I cannot read from or write to this files. I have no experience writing to files in Java which may be why I am having a rough time with this. </p> <p>Write code:</p> <pre><code> File scoresFile = new File(getExternalFilesDir(null), "scores.xml"); if (!scoresFile.exists()) { scoresFile.createNewFile(); } OutputStream os = new FileOutputStream(scoresFile); os.write(writer.toString().getBytes()); os.flush(); os.close(); </code></pre> <p>Read Code:</p> <pre><code> XmlPullParserFactory xmlFac = XmlPullParserFactory.newInstance(); XmlPullParser qXML = xmlFac.newPullParser(); InputStream is = null; File scoresFile = new File(c.getExternalFilesDir(null), "scores.xml"); if (!scoresFile.exists()) { try { scoresFile.createNewFile(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } try { is = new FileInputStream(scoresFile); } catch (FileNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } if (is != null) qXML.setInput(is,null); else qXML = c.getResources().getXml(R.xml.scores); </code></pre> <p>UPDATE: The last if clause in the read section always evaluates to false. So, the InputStream is null... that appears to be the root of my problem. </p>
 

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