第十一十二周作业

package com.example.charp1;

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

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

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

    public void click1(View view) {
        EditText editText1 = (EditText) findViewById(R.id.et1);
        EditText editText2 = (EditText) findViewById(R.id.et2);
        String filename = "data.txt";
        String context = editText1.getText().toString();
        FileOutputStream fos = null;
        try {
            fos = openFileOutput(filename, MODE_PRIVATE);
            fos.write(context.getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        Toast.makeText(this, "保存成功", Toast.LENGTH_SHORT).show();

    }

    public void click2(View view) {
        EditText editText2 = (EditText) findViewById(R.id.et2);
        String context = "";
        FileInputStream fis = null;
        try {
            fis = openFileInput("data.txt");
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            context = new String(buffer);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        editText2.setText(context);
    }
}

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

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

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

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.bt1);
        findViewById(R.id.bt2);
        EditText editText1=findViewById(R.id.et1);
        EditText editText2=findViewById(R.id.et2);
    }
    public void click1(View view){
        EditText editText1=findViewById(R.id.et1);
        EditText editText2=findViewById(R.id.et2);
        String fileName="data.txt";
        String context=editText1.getText().toString();
        FileOutputStream fos=null;
        try {
            fos=openFileOutput(fileName,MODE_PRIVATE);
            fos.write(context.getBytes());
        }catch(Exception e){
            e.printStackTrace();
        }finally {
            if (fos!=null){
                try {
                    fos.close();
                }catch(IOException e){
                    e.printStackTrace();
                }
            }
        }
        Toast.makeText(this,"保存成功",Toast.LENGTH_SHORT).show();
    }
    public void click2(View view){
        EditText editText2=findViewById(R.id.et2);
        String context="";
        FileInputStream fis=null;
        try {
            fis=openFileInput("data.txt");
            byte[]buffer=new byte[fis.available()];
            fis.read(buffer);
            context=new String(buffer);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if (fis!=null){
                try{
                    fis.close();
                }catch(IOException e){
                    e.printStackTrace();
                }
            }
        }
        editText2.setText(context);
    }
}

 

 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">
    <TextView
        android:id="@+id/tv1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="账号"
        android:textSize="20dp"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="10dp"
        android:textColor="#000"/>
    <EditText
        android:id="@+id/et1"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:hint="请输入用户名"
        android:layout_toRightOf="@id/tv1"/>
    <TextView
        android:id="@+id/tv2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:text="密码"
        android:textColor="#000"
        android:textSize="20dp"
        android:layout_marginTop="10dp"
        android:layout_below="@id/et1"/>
    <EditText
        android:id="@+id/et2"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:hint="请输入密码"
        android:layout_below="@id/et1"
        android:layout_toRightOf="@id/tv2"/>
    <Button
        android:id="@+id/bt1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="登录"
        android:textColor="#FFFFFF"
        android:background="#000"
        android:layout_below="@id/et2"
        android:layout_marginLeft="280dp"/>
    <CheckBox
        android:id="@+id/cb1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="记住密码"
        android:layout_below="@id/et2"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="50dp"/>
    <CheckBox
        android:id="@+id/cb2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="自动登录"
        android:layout_below="@id/et2"
        android:layout_toRightOf="@id/cb1"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="20dp"/>

</RelativeLayout>

package com.example.qq;

import android.content.Context;

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

public class FileSaveQQ {
    public static boolean saveUserInfo(Context context, String account, String password ) {

        FileOutputStream fos = null;
        try{
            fos =context.openFileOutput("data.txt",Context.MODE_PRIVATE);
            fos.write((account+":"+password).getBytes());
            return true;

        }catch (Exception e){
            e.printStackTrace();
            return  false;

        }finally {
            try{
                if (fos !=null){
                    fos.close();
                }
            }catch (IOException e){
                e.printStackTrace();
            }
        }
    }
    public static Map<String, String> getUserInfo(Context context){
        String content="";
        FileInputStream fis= null;
        try {
            fis=context.openFileInput("data.txt");
            byte[] buffer =new byte[fis.available()];
            fis.read(buffer);
            content=new String(buffer);
            Map<String,String> userMap = new HashMap<String, String>();
            String[] infos = content.split(":");
            userMap.put("account",infos[0]);
            userMap.put("password",infos[1]);
            return userMap;

        }catch (Exception e){
            e.printStackTrace();
            return null;

        }
        finally {
            try {
                if (fis!=null){
                    fis.close();
                }
            }catch (IOException e){
                e.printStackTrace();
            }
        }
    }
}

package com.example.myapplication;

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

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

public class FileSaveQQ {
    public static boolean saveUserInfo(Context context,String account,String password ){
        SharedPreferences sp=context.getSharedPreferences("data", context.MODE_PRIVATE);
        SharedPreferences.Editor editor=sp.edit();
        editor.putString("Username", account);
        editor.putString("pwd", password);
        editor.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;


    }

}