package com.hwys.helloworld;

import android.content.SharedPreferences;
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.Toast;

public class SharedPrefActivity extends AppCompatActivity implements View.OnClickListener{
    EditText etName, etEmail;
    Button btnSave, btnRetreive, btnClear;

    SharedPreferences pref; SharedPreferences.Editor editor;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shared_pref);

        etEmail = findViewById(R.id.etEmail);
        etName = findViewById(R.id.etName);

        btnSave = findViewById(R.id.btnSave);
        btnSave.setOnClickListener(this);
        btnRetreive = findViewById(R.id.btnRetreive);
        btnRetreive.setOnClickListener(this);
        btnClear = findViewById(R.id.btnClear);
        btnClear.setOnClickListener(this);


    }

    public void onClick(View v){
        switch (v.getId()){
            case R.id.btnSave:
                pref = getSharedPreferences("MY_PREF", MODE_PRIVATE);
                editor = pref.edit();
                editor.putString("name", etName.getText().toString());
                editor.putString("email", etEmail.getText().toString());
                editor.commit();
                etEmail.setText("");
                etName.setText("");
                Toast.makeText(SharedPrefActivity.this, "Saved", Toast.LENGTH_LONG).show();
                break;

            case R.id.btnRetreive:
                pref = getSharedPreferences("MY_PREF", MODE_PRIVATE);
                if(pref.contains("name")){
                    etName.setText(pref.getString("name", ""));
                    etEmail.setText(pref.getString("email", ""));
                }
                break;

            case R.id.btnClear:
                pref = getSharedPreferences("MY_PREF", MODE_PRIVATE);
                editor = pref.edit();

                //To Delete a value
                //editor.remove("name");

                //To Clear all values
                editor.clear();
                editor.commit();
                etName.setText("");
                etEmail.setText("");
                Toast.makeText(SharedPrefActivity.this, "Cleared all data", Toast.LENGTH_LONG).show();

        }
    }
}