AS第十一、十二周作业

1.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical">
 <TextView
     android:id="@+id/tv_1"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:text="内部存储空间文件操作"
     android:textSize="30dp"
     android:layout_margin="5dp"
     android:background="#706767"/>
 <EditText
     android:id="@+id/et_1"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_marginTop="45dp"
     android:hint="输入你想写入的内容"
     android:textSize="25dp"
     android:layout_marginLeft="10dp"/>
 <Button
     android:id="@+id/but_1"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_marginLeft="15dp"
     android:text="写入"
     android:textSize="25dp"
     android:background="#A09B9B"
     android:onClick="click1"/>



 <EditText
     android:id="@+id/et_2"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_marginTop="45dp"
     android:hint="显示读取的内容"
     android:textSize="25dp"
     android:layout_marginLeft="10dp"/>


 <Button
     android:id="@+id/but_2"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_marginLeft="15dp"
     android:text="读取"
     android:textSize="25dp"
     android:background="#A09B9B"
     android:onClick="click2"/>
</LinearLayout>

package cn.itcast.save;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

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);
    }
    public void click1(View view) {
        String fileName="data.txt";

        String content=((EditText)(findViewById(R.id.et_1))).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 (Exception e) {
                e.printStackTrace();
            }
        }
        Toast.makeText(this, "已写入",Toast.LENGTH_LONG).show();


    }
    public void click2(View view){
        EditText editText2=findViewById( R.id.et_2 );
        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 (Exception e) {
                e.printStackTrace();
            }
        }
        editText2.setText( content );
    }



}

 

2. 

package com.example.aaaa;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;

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

public class MainActivity extends Activity {
    private EditText et_name;
    private EditText et_pass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        et_name=(EditText) findViewById(R.id.action_settings);
        et_pass=(EditText) findViewById(R.id.action_settings);
        
        readAccount();
    }

    private void readAccount() {
        Object info;
        // TODO Auto-generated method stub
        File file=new File(getCacheDir(),"1.txt");
        if(file.exists()){
            try{
                FileInputStream fis=new FileInputStream(file);
                BufferedReader br=new BufferedReader(new InputStreamReader(fis));
                String text=br.readLine();
                String[] s=text.split("##");
                et_name.setText(s[0]);
                et_pass.setText(s[1]);
            } catch (Exception e){
                e.printStackTrace();
            }
        }
        
    }
    public void login(View v){
        String name=et_name.getText().toString();
        String pass=et_pass.getText().toString();
        CheckBox cb_1=(CheckBox) findViewById(R.id.action_settings);
        CheckBox cb_2=(CheckBox) findViewById(R.id.action_settings);
        
        if(cb_1.isChecked()){
            File file=new File(getCacheDir(),"1.txt");
            FileOutputStream fos;
            try{
                fos=new FileOutputStream(file);
                fos.write((name+"##"+pass).getBytes());
                fos.close();
            } catch (Exception e){
                e.printStackTrace();
            }
        }
        
        Toast.makeText(this, "登录成功", 0).show();
    }
    


    
    
    
}

<LinearLayout 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:orientation="vertical" >

    <EditText
        android:id="@+id/et_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"        
        android:hint="请输入用户名" />

    <EditText
        android:id="@+id/et_pass"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入密码"
        android:inputType="textPassword"        
    />
<RelativeLayout 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    <CheckBox 
        android:id="@+id/cb_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:text="记住密码" />

    <CheckBox
        android:id="@+id/cb_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:text="自动登录" />

</RelativeLayout>

<Button
    android:id="@+id/bt_2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="login"
    android:text="登录" />

    

    

</LinearLayout>