In any class, choose a textView to set text.
Copy the code lines to below findViewByid.
String write="This is
example text";
try {
FileOutputStream fos =
openFileOutput("text.txt", Context.MODE_APPEND);
OutputStreamWriter osw = new
OutputStreamWriter(fos);
osw.append(write);
osw.flush();
osw.close();
} catch
(FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Here we write a String to file name text.txt,
to make sure the data has write, we read that file and set text to textView.
String read="";
try {
String
FILE_NAME = "text.txt";
FileInputStream
fIS = openFileInput(FILE_NAME);
byte[] arrayData = new byte[fIS.available()];
if((fIS.read(arrayData))!=
-1){
String
fileContent = new String(arrayData);
read=fileContent;
tv.setText(read);
}
fIS.close();
}
catch (Exception e) {
//Log.e("Error",
e.toString());
}
Run to see text has read success.
If you quit and reopen class many times, you will see many string add to
textView, because file text.txt always there
and programme continue to write many times.
