package bzu.edu.cn.myapplication;

import android.app.Activity;

import android.content.Intent;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.CheckBox;

import android.widget.EditText;

import android.widget.Toast;

/**

 * 这是一个用于记住密码的demo

 * 知识点：SharedPreferences 存储的数据存储到xml文件中，读取的时候通过检测checkbox是否被选中，从而判断

 * 是否需要从xml中进行密码的读取操作

 */

public class MainActivity extends Activity {

    private EditText edt_user,edt_pass;

    private CheckBox ck_save;

    private Button btn_login;

    private static final String PREFS_NAME="NamePWD";

    private SharedPreferences sharedPreferences=null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        initView(); // 初始化控件

        setListener(); //设置监听事件

        getData(); //第二次进入的时候得到数据

    }

    @Override

    protected void onResume() {

        super.onResume();

        getData();

    }

    private void getData() {

        sharedPreferences=getSharedPreferences(PREFS_NAME,MODE_PRIVATE);

        //判断之前是否存储过密码

        if(sharedPreferences.getBoolean("isKeep",true)){

            edt_user.setText(sharedPreferences.getString("user",""));

            edt_pass.setText(sharedPreferences.getString("pass",""));

        }else {

            edt_user.setText("");

            edt_pass.setText("");

        }

    }

    private void setListener() {

        btn_login.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                if("monster".equals(edt_user.getText().toString())&&"123".equals(edt_pass.getText().toString())){

                    if(ck_save.isChecked()){

                        //如果checkbook被选中

                        sharedPreferences=getSharedPreferences(PREFS_NAME,MODE_PRIVATE);

                        SharedPreferences.Editor edit=sharedPreferences.edit();

                        edit.putBoolean("isKeep",true);

                        edit.putString("user",edt_user.getText().toString());

                        edit.putString("pass",edt_pass.getText().toString());

                        edit.commit();

                    }else {

                        sharedPreferences=getSharedPreferences(PREFS_NAME,MODE_PRIVATE);

                        SharedPreferences.Editor edit=sharedPreferences.edit();

                        edit.putBoolean("isKeep",false);

                        edit.putString("user","");

                        edit.putString("pass","");

                        edit.commit();

                    }

                    //跳转

                    Intent intent=new Intent(MainActivity.this,SecondActivity.class);

                    startActivity(intent);

                }else {

                    Toast.makeText(MainActivity.this,"账号或密码错误",Toast.LENGTH_SHORT).show();

                }

            }

        });

    }

    private void initView() {

        edt_user= (EditText) findViewById(R.id.edt_user);

        edt_pass= (EditText) findViewById(R.id.edt_Pass);

        ck_save= (CheckBox) findViewById(R.id.ck_save);

        btn_login= (Button) findViewById(R.id.btn_login);

    }

}