AssetManager am = getAssets();
InputStream is = null;
try {
                is = am.open(filepath);
            } catch (IOException e) {
                Log.d("ARTIGOS", "Failed to open " + artigosFich[i]);

            }
byte[] buffer;
            try {
                int size = is.available();
                buffer = new byte[size];
                is.read(buffer);
            } catch (IOException e) {
                Log.d("ARTIGOS", "Failed to read " + artigosFich[i]);
                continue;
            } finally {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
String textoDoFicheiro = new String(buffer);