Notes

package com.example.administrator.myapplication;

import android.content.Intent;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MainActivity extends AppCompatActivity {

int progress = 0;
private final static String salt = "DGE$5SGr@3VsHYUMas2323E4d57vfBfFSTRU@!DSH(*%FDSdfg13sgfsg";

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


final Button button = findViewById(R.id.button);
final EditText editText = findViewById(R.id.editText);
final EditText editText2 = findViewById(R.id.editText2);

final ProgressBar simpleProgressBar = (ProgressBar) findViewById(R.id.progressBar);



button.setOnClickListener(new View.OnClickListener() {


@Override
public void onClick(View v) {

String username="adm";
String password="123";

String getuser=editText.getText().toString();
String getpass=editText2.getText().toString();

simpleProgressBar.setProgress(progress);
//thread is used to change the progress value



if(username.equals(getuser) & password.equals(getpass)){
//untuk paparan uname & upass betul
//Toast.makeText(getApplicationContext(),"Welcome to LPPSA android version", Toast.LENGTH_SHORT).show();



new Thread(new Runnable() {
@Override
public void run() {
while (progress < 100){
progress += 75;
//update the progress bar and display the current view value in the text view

simpleProgressBar.setProgress(progress);
try{
//sleep for 200 milisecond.
Thread.sleep(1000);
}catch (InterruptedException e){
e.printStackTrace();
}

}
}
}).start();


String detailarray = ("Login username :" + getuser + "/" + "password :" + md5Hash(getpass));
writeToFile(detailarray);
//untuk ke page seterusnya
startActivity(new Intent(MainActivity.this, Main2Activity.class));

}else {
Toast.makeText(getApplicationContext(), "Invalid Username Or Password", Toast.LENGTH_LONG).show();
}
}
});
}

public static String md5Hash(String message){
String md5 = "";
if (null == message)
return null;

//adding a salt to the string before it gets hashed.
message = message+salt;
try{
MessageDigest digest = MessageDigest.getInstance("MD5"); // create messagedigest object for MD5
digest.update(message.getBytes(), 0, message.length()); // update input string in message digest
md5 = new BigInteger(1, digest.digest()).toString(16); // converts message digest value in base 16(hex)
}catch (NoSuchAlgorithmException e){
e.printStackTrace();
}return md5;
}


private void writeToFile(String detailarray) {
try {

BufferedWriter fos = new BufferedWriter(new FileWriter(Environment.getExternalStorageDirectory().getAbsolutePath() +"/"+"details.txt"));
fos.write(detailarray);
fos.close();
}
catch(IOException e) {
}
}
}