1. Text File Read and Write Method

2. Write File String fcontent; String fname;
String fpath = “/sdcard/”+fname+“.txt”;
 File file = new File(fpath);
 // If file does not exists, then create it
 if (!file.exists()) {
      file.createNewFile();  }
FileWriter fw = new FileWriter(file.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
bw.write(fcontent);
bw.close();

3. Read File – Line method String fname; BufferedReader br = null;
 String response = null;
 try {
        StringBuffer output = new StringBuffer();
        String fpath = "/sdcard/"+fname+".txt";
        br = new BufferedReader(new FileReader(fpath));
        String line = "";
        while ((line = br.readLine()) != null) {
          output.append(line +“\n”);  }
 response = output.toString();

4. Read File – Buffer method
FileInputStream fileIn=openFileInput("mytextfile.txt");
InputStreamReader InputRead= new InputStreamReader(fileIn);
char[] inputBuffer= new char[READ_BLOCK_SIZE];
String s="";
int charRead;
while ((charRead=InputRead.read(inputBuffer))>0) {
// char to string conversion
String readstring=String.copyValueOf(inputBuffer,0,charRead);
s +=readstring; }
InputRead.close();
Toast.makeText(getBaseContext(), s ,Toast.LENGTH_SHORT).show();

5. Stream Method File outputFile=new File(FILE_PATH+“/”+FILE_NAME);
FileOutputStream outputStream;
try {
outputStream = new FileOutputStream(outputFile);
outputStream.write(writeTxt.getText().toString().getBytes());
outputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) { }

6. Stream Method File inputFile=new File(FILE_PATH+“/”+FILE_NAME);
int length=(int)inputFile.length();
FileInputStream inputStream;
try {
inputStream = new FileInputStream(inputFile);
byte[] buffer=new byte[length];
inputStream.read(buffer);
inputStream.close();
String string=“”;

7. for(int i=0; i<buffer.length; i++) {
char c=(char) buffer[i];
string+=c; }
readTxt.setText(string);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {