sp

package com.example.sharedpreferencesdemo;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private EditText name, pwd;
    private CheckBox check;
    private SharedPreferences sp;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        name = (EditText) findViewById(R.id.name);
        pwd = (EditText) findViewById(R.id.pwd);
        check = (CheckBox) findViewById(R.id.check);
        //1。通过getSharedPreferences获得一个sp对象
        sp = getSharedPreferences("inclogin", 0);
        String n1 = sp.getString("name", "");
        String p1 = sp.getString("pwd", "");
        name.setText(n1);
        pwd.setText(p1);

    }

    public void click(View view) {
        String n = name.getText().toString().trim();
        String p = pwd.getText().toString().trim();
        if (TextUtils.isEmpty(name.getText().toString().trim()) || TextUtils.isEmpty(pwd.getText().toString().trim())) {
            Toast.makeText(MainActivity.this, "账号密码不能为空", Toast.LENGTH_SHORT).show();
        } else {
            if (check.isChecked()) {
                //2.获取sp的编辑器
                SharedPreferences.Editor edit = sp.edit();
                edit.putString("name", n);
                edit.putString("pwd", p);
                edit.commit();
            }else{
            }
            Toast.makeText(MainActivity.this, "登录成功", Toast.LENGTH_SHORT).show();
        }
    }
}