<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  tools:context="com.example.kh11.MainActivity">

  <ImageView
    android:id="@+id/iv"
    android:layout_width="70dp"
    android:layout_height="70dp"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="40dp"
    android:background="@drawable/touxiang"/>
  <LinearLayout
    android:id="@+id/ll_number"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/iv"
    android:layout_centerVertical="true"
    android:layout_marginBottom="5dp"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginTop="15dp"
    android:background="#ffffff">
    <TextView
      android:id="@+id/tv_number"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:padding="10dp"
      android:text="賬號(hào):"
      android:textColor="#000"
      android:textSize="20sp"/>
    <EditText
      android:id="@+id/et_number"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_marginLeft="5dp"
      android:background="@null"
      android:padding="10dp"/>
  </LinearLayout>
  <LinearLayout
    android:id="@+id/ll_password"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/ll_number"
    android:layout_centerVertical="true"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:background="#ffffff">
    <TextView
      android:id="@+id/tv_password"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:padding="10dp"
      android:text="密碼:"
      android:textColor="#000"
      android:textSize="20sp"/>
    <EditText
      android:id="@+id/et_password"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_marginLeft="5dp"
      android:background="@null"
      android:inputType="textPassword"
      android:padding="10dp"/>
  </LinearLayout>
  <Button
    android:id="@+id/btn_login"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/ll_password"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginTop="50dp"
    android:background="#3C8DC4"
    android:text="登錄"
    android:textColor="#ffffff"
    android:textSize="20sp"/>
</RelativeLayout>

package cn.itcast.saveqq;

import android.content.Context;
import android.content.SharedPreferences;

import java.util.HashMap;
import java.util.Map;

public class SPSaveQQ {
  public static boolean saveUserInfo(Context context,String number,String password){
    SharedPreferences sp = context.getSharedPreferences("data",Context.MODE_PRIVATE);
    SharedPreferences.Editor edit = sp.edit();
    edit.putString("userName",number);
    edit.putString("pwd", password);
    edit.commit();
    return true;
  }
  public static Map<String ,String> getUserInfo(Context context){
    SharedPreferences sp = context.getSharedPreferences("data",Context.MODE_PRIVATE);
    String number = sp.getString("userName", null);
    String password = sp.getString("pwd", null);
    Map<String ,String > userMap = new HashMap<String,String>();
    userMap.put("number",number);
    userMap.put("password",password);
    return userMap;
  }
}

package com.example.kh11;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.util.Map;
import cn.itcast.saveqq.SPSaveQQ;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
  private EditText etNumber;
  private EditText etPassword;
  private Button btnLogin;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //初始化界面
    initView();
    Map<String ,String > userInfo = SPSaveQQ.getUserInfo(this);
    if(userInfo != null){
      etNumber.setText(userInfo.get("number"));
      etPassword.setText(userInfo.get("password"));
    }
  }
  private void initView(){
    etNumber = (EditText) findViewById(R.id.et_number);
    etPassword = (EditText) findViewById(R.id.et_password);
    btnLogin = (Button) findViewById(R.id.btn_login);
    //設(shè)置按鈕的點(diǎn)擊事件
    btnLogin.setOnClickListener(this);
  }
  @Override
  public void onClick(View v) {
    //當(dāng)單機(jī)登錄按鈕時(shí)，獲取QQ賬號(hào)和密碼
    String number = etNumber.getText().toString().trim();
    String password = etPassword.getText().toString();
    //檢驗(yàn)賬號(hào)和密碼是否正確
    if(TextUtils.isEmpty(number)){
      Toast.makeText(this,"請(qǐng)輸入QQ賬號(hào)",Toast.LENGTH_SHORT).show();
      return;
    }
    if(TextUtils.isEmpty(password)){
      Toast.makeText(this,"請(qǐng)輸入密碼",Toast.LENGTH_SHORT).show();
      return;
    }
    //登陸成功
    Toast.makeText(this,"登陸成功",Toast.LENGTH_SHORT).show();
    //保存用戶信息
    boolean isSaveSuccess = SPSaveQQ.saveUserInfo(this,number,password);
    if(isSaveSuccess){
      Toast.makeText(this,"保存成功",Toast.LENGTH_SHORT).show();
    }else{
      Toast.makeText(this,"保存失敗",Toast.LENGTH_SHORT).show();
    }
  }
}