read write

readwrite.java

package com.example.deniz.readwritefile;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class MainActivity extends AppCompatActivity {
    String msg = "0121";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final EditText edtText = (EditText) findViewById(R.id.edtText);

        final TextView txtRead = (TextView) findViewById(R.id.txtread);
        final TextView blntext = (TextView) findViewById(R.id.blntext);

        Button btnRead = (Button) findViewById(R.id.btnRead);
        Button btnWrite = (Button) findViewById(R.id.btnWrite);
        Button btn0 = (Button) findViewById(R.id.btn0);


        btnWrite.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String msg = edtText.getText().toString();
                String saveFile = "save_file";
                try {
                    FileOutputStream outputSaveFile = openFileOutput(saveFile,MODE_PRIVATE);
                    outputSaveFile.write(msg.getBytes());
                    outputSaveFile.close();
                    Toast.makeText(getApplicationContext(),"Saved",Toast.LENGTH_LONG).show();

                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        });

        btnRead.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                try {
                    int i=0;
                    FileInputStream saveFile = openFileInput("save_file");
                    InputStreamReader inputReader = new InputStreamReader(saveFile);
                    BufferedReader buffReader = new BufferedReader(inputReader);
                    StringBuffer strBuffer = new StringBuffer();
                   // msg=buffReader.readLine();
                   // Log.i("LOG", msg);
                    char a = buffReader.readLine().charAt(0);

                    txtRead.setText(strBuffer.toString());

                    if(a=='1') {
                        blntext.setText("denz");

                    }
                    else{
                        blntext.setText("asdasd");
                    }
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                
                
              //  txtRead.setText(msg.charAt(0));
                
            }
            
            


        });

        btn0.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                char a = msg.charAt(0);
                if(a=='1') {
                    blntext.setText("denz");

                }
                else{
                    blntext.setText("asdasd");
                }
            }
        });





    }
}