Main2Activity

public class Main2Activity extends AppCompatActivity {
    private EditText ed_phone;
    private EditText ed_pwd;
    private CheckBox jz;
    private Button btn;
    private SharedPreferences sp;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        initView();
        initData();
    }
    private void initView() {
        ed_phone = findViewById(R.id.ed_phone);
        ed_pwd = findViewById(R.id.ed_pwd);
        jz = findViewById(R.id.checkbox);
        btn = findViewById(R.id.btn);
        sp = getSharedPreferences("login", MODE_PRIVATE);
        if (sp.getBoolean("ischeck",false)){
            jz.setChecked(true);
             String phone = sp.getString("phone", "");
            String pwd = sp.getString("pwd", "");
            ed_phone.setText(phone);
            ed_pwd.setText(pwd);
        }
    }

    private void initData() {
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String phone = ed_phone.getText().toString().trim();
                String pwd = ed_pwd.getText().toString().trim();
                if (jz.isChecked()){
               sp.edit().putString("phone",phone).putString("pwd",pwd)
               .putBoolean("ischeck",true).commit();
                }else {
                    sp.edit().putBoolean("ischeck",false).commit();
                }
            }
        });
    }
}