第十一周，十二周作业

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class Demo9Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_demo9);


        findViewById(R.id.btn1);
        findViewById(R.id.btn2);

    }
        public void click1(View view){
            EditText et1=findViewById(R.id.et1);
            String fileName="data.txt";
            String content=et1.getText().toString();
            FileOutputStream fos=null;
            try{
                fos=openFileOutput(fileName,MODE_PRIVATE);
                fos.write(content.getBytes());
            }catch (Exception e){
                e.printStackTrace();
            }finally{
                try{
                    if (fos!=null){
                        fos.close();
                    }
                }catch (IOException e){
                    e.printStackTrace();
                }
            }
            Toast.makeText(Demo9Activity.this,"储存成功",Toast.LENGTH_LONG).show();

        }
        public void click2(View v){
            EditText et2=findViewById(R.id.et2);
            String content="";
            FileInputStream fis=null;
            try {
                fis=openFileInput("data.txt");
                byte[]buffer=new byte[fis.available()];
                fis.read(buffer);
                content=new String(buffer);
            } catch (Exception e) {
                e.printStackTrace();
            }finally {
                try{
                    if (fis!=null){
                        fis.close();
                    }
                }catch (IOException e){
                    e.printStackTrace();
                }
            }
            et2.setText(content);

        }


}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Demo9Activity"
    android:orientation="vertical">

    <EditText
        android:id="@+id/et1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入数据"/>
    <Button
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="储存"
        android:onClick="click1"
        />
    <EditText
        android:id="@+id/et2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />
    <Button
        android:id="@+id/btn2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="读取"
        android:onClick="click2"/>
</LinearLayout>

 

 

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="用户登录"
        android:textColor="#FFC0CB"
        android:textSize="30dp"/>


    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="账号"
            android:textColor="#D8BFD8"
            android:textSize="20dp"/>

        <EditText
            android:id="@+id/a1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="请输入用户名" />
    </LinearLayout>


    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密码"
            android:textColor="#D8BFD8"
            android:textSize="20dp"/>

        <EditText
            android:id="@+id/a2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="请输入密码" />
    </LinearLayout>

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <CheckBox
        android:id="@+id/b1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="记住密码"
        android:textSize="15dp" />

<CheckBox
    android:id="@+id/b2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="自动登录"
    android:textSize="15dp" />

    <Button
        android:id="@+id/c1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="登录"
        android:textSize="20dp"
        android:textColor="#9370DB"/>
</LinearLayout>
</LinearLayout>

package com.example.gc1;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.SharedMemory;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TableLayout;
import android.widget.Toast;

import java.io.FileInputStream;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private EditText a1;//账号输入框
private EditText a2;//密码输入框
private Button c1;//登录按钮
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();
        Map<String,String>userInfo = SPSaveQQ.getUserInfo(this);
        if (userInfo!=null){
            a1.setText(userInfo.get("account"));
            a2.setText(userInfo.get("pssword"));
        }
    }

    private void initView() {
        a1=(EditText)findViewById(R.id.a1);
        a2=(EditText)findViewById(R.id.a2);
        c1=(Button)findViewById(R.id.c1);
        c1.setOnClickListener(this);
    }

    public void onClick(View view){
        switch (view.getId()){
            case R.id.c1:
                String account =a1.getText().toString().trim();
                String password =a2.getText().toString();
                if (TextUtils.isEmpty(account)){
                    Toast.makeText(this,"请输入账号",Toast.LENGTH_SHORT).show();
                    return;
                }
                if (TextUtils.isEmpty(password)){
                    Toast.makeText(this,"请输入密码",Toast.LENGTH_SHORT).show();
                    return;
                }
                Toast.makeText(this,"登陆成功",Toast.LENGTH_SHORT).show();
                boolean isSaveSuccess =SPSaveQQ.saveUserInfo(this,account,password);
                if (isSaveSuccess){
                    Toast.makeText(this,"保存成功", Toast.LENGTH_SHORT).show();
                }else
                {
                    Toast.makeText(this,"保存失败",Toast.LENGTH_SHORT).show();

                }
                break;
        }
    }

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

}