Android FileInputStream read() txt file to String

For reading file try this:

FileInputStream fis;fis = openFileInput("test.txt");StringBuffer fileContent = new StringBuffer("");byte[] buffer = new byte[1024];while ((n = fis.read(buffer)) != -1) {   fileContent.append(new String(buffer, 0, n)); }

Try something like this

    public void writeData ( String data ) {        try {            FileOutputStream fOut = openFileOutput ( "settings.dat" , MODE_WORLD_READABLE ) ;            OutputStreamWriter osw = new OutputStreamWriter ( fOut ) ;            osw.write ( data ) ;            osw.flush ( ) ;            osw.close ( ) ;        } catch ( Exception e ) {            e.printStackTrace ( ) ;        }    }    public String readSavedData ( ) {        StringBuffer datax = new StringBuffer("");        try {            FileInputStream fIn = openFileInput ( "settings.dat" ) ;            InputStreamReader isr = new InputStreamReader ( fIn ) ;            BufferedReader buffreader = new BufferedReader ( isr ) ;            String readString = buffreader.readLine ( ) ;            while ( readString != null ) {                datax.append(readString);                readString = buffreader.readLine ( ) ;            }            isr.close ( ) ;        } catch ( IOException ioe ) {            ioe.printStackTrace ( ) ;        }        return datax.toString() ;    }

Less is more;

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        TextView tvText = (TextView) findViewById(R.id.tvText);        try {            // Create File and Content            String FILE_NAME = "hallo.txt";            String content = "Hallo Welt!";            FileOutputStream fos = openFileOutput(FILE_NAME, MODE_PRIVATE);            fos.write(content.getBytes());            fos.close();            // Read File and Content            FileInputStream fin = openFileInput(FILE_NAME);            int size;            String neuText = null;            // read inside if it is not null (-1 means empty)            while ((size = fin.read()) != -1) {                // add & append content                neuText += Character.toString((char) size);            }            // Set text to TextView            tvText.setText(neuText);        } catch (Exception error) {            // Exception        }    }}