Android第十一、十二周作业

图片一用内部存储实现文件写入和读取功能

<?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="match_parent"

        android:layout_height="wrap_content"

        android:text="内部存储空间文件操作"

        android:textSize="20sp"

        android:textColor="#FFB6C1"/>

    <EditText

        android:id="@+id/a1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="输入你想要写入的内容" />

<Button

    android:id="@+id/b1"

    android:layout_width="100sp"

    android:layout_height="wrap_content"

    android:text="写入"

    android:textColor="#000000"

    android:onClick="click1"/>

    <EditText

        android:id="@+id/a2"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="显示读取的内容" />

    <Button

        android:id="@+id/b2"

        android:layout_width="100sp"

        android:layout_height="wrap_content"

        android:text="读取"

        android:textColor="#000000"

        android:onClick="click2"/>

</LinearLayout>

package com.example.gcgc;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;

import android.view.View;

import android.os.Bundle;

import android.widget.EditText;

import android.widget.Toast;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

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);

    }

    @SuppressLint("WrongConstant")

    public void click1(View view){

        EditText a1=findViewById(R.id.a1);

        EditText a2=findViewById(R.id.a2);

        String fileName ="data.txt";

        String content =a1.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(this,"保存成功",0).show();

    }

    @SuppressLint("WrongConstant")

    public void click2(View view){

        EditText a2 =findViewById(R.id.a2);

        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();

            }

            a2.setText(content);

        }

    }

}

图片二使用sharedpreference实现记住密码功能

<?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;

        }

    }

}

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Android第十一、十二周作业

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