登录（记住账号密码、获取后台数据）

向右看齐 2023-08-17 17:09 192阅读 0赞

1、在build.gradle导入okHttp3

2、activity_mian.xml样式文件

3、创建保存账号密码类

4、主页代码

5、完成以上4个步骤后，部分手机上用不了（如果您使用的是http，Android9.0手机是用不了的，看本博客的“Android P不能使用http”解决不能使用http的方法）。

在build.gradle导入okHttp3（加入进去后记得在Android studio的右上角点击“Sync Now”同步）

  1. implementation 'com.squareup.okhttp3:okhttp:3.4.1' //okhttp3

activity_mian.xml样式文件

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  4.     xmlns:tools="http://schemas.android.com/tools"
  5.     android:layout_width="match_parent"
  6.     android:layout_height="match_parent"
  7.     tools:context=".MainActivity">
  10.     <ImageView
  11.         android:id="@+id/iv"
  12.         android:layout_width="70dp"
  13.         android:layout_height="70dp"
  14.         android:layout_centerHorizontal="true"
  15.         android:layout_marginTop="40dp"
  16.         android:background="@drawable/dongman"/>
  18.     <LinearLayout
  19.         android:id="@+id/ll_number"
  20.         android:layout_width="match_parent"
  21.         android:layout_height="wrap_content"
  22.         android:layout_below="@+id/iv"
  23.         android:layout_centerVertical="true"
  24.         android:layout_marginTop="15dp"
  25.         android:layout_marginLeft="10dp"
  26.         android:layout_marginRight="10dp"
  27.         android:layout_marginBottom="5dp"
  28.         android:background="#ffffff">
  30.         <TextView
  31.             android:id="@+id/tv_number"
  32.             android:layout_width="wrap_content"
  33.             android:layout_height="wrap_content"
  34.             android:padding="10dp"
  35.             android:text="账号"
  36.             android:textColor="#000"
  37.             android:textSize="20sp"/>
  38.         <EditText
  39.             android:id="@+id/et_number"
  40.             android:layout_width="match_parent"
  41.             android:layout_height="wrap_content"
  42.             android:layout_marginLeft="5dp"
  43.             android:background="@null"
  44.             android:padding="10dp"/>
  45.     </LinearLayout>
  48.     <LinearLayout
  49.         android:id="@+id/ll_password"
  50.         android:layout_width="match_parent"
  51.         android:layout_height="wrap_content"
  52.         android:layout_below="@+id/ll_number"
  53.         android:layout_centerVertical="true"
  54.         android:layout_marginTop="15dp"
  55.         android:layout_marginLeft="10dp"
  56.         android:layout_marginRight="10dp"
  57.         android:layout_marginBottom="5dp"
  58.         android:background="#ffffff">
  60.         <TextView
  61.             android:id="@+id/tv_password"
  62.             android:layout_width="wrap_content"
  63.             android:layout_height="wrap_content"
  64.             android:padding="10dp"
  65.             android:text="密码"
  66.             android:textColor="#000"
  67.             android:textSize="20sp"/>
  68.         <EditText
  69.             android:id="@+id/et_password"
  70.             android:layout_width="match_parent"
  71.             android:layout_height="wrap_content"
  72.             android:layout_marginLeft="5dp"
  73.             android:background="@null"
  74.             android:padding="10dp"/>
  75.     </LinearLayout>
  76.     <Button
  77.         android:id="@+id/btn_login"
  78.         android:layout_width="match_parent"
  79.         android:layout_height="wrap_content"
  80.         android:layout_below="@+id/ll_password"
  81.         android:layout_marginLeft="10dp"
  82.         android:layout_marginRight="10dp"
  83.         android:layout_marginTop="30dp"
  84.         android:text="登录"
  85.         android:background="#3C8DC4"
  86.         android:textSize="20sp"/>
  89. </RelativeLayout>

创建保存账号密码类

  1. package com.example.remembernp;
  3. import android.content.Context;
  5. import java.io.FileInputStream;
  6. import java.io.FileOutputStream;
  7. import java.util.HashMap;
  8. import java.util.Map;
  10. public class SaveFile {
  11.     //把账号密码保存在data.txt文件中
  12.     public static boolean saveUserInfo(Context context, String number, String password){
  13.         try{
  14.             FileOutputStream fos = context.openFileOutput("data.txt",Context.MODE_PRIVATE);
  15.             fos.write((number + ":" + password).getBytes());
  16.             fos.close();
  17.             return true;
  18.         }catch (Exception e){
  19.             e.printStackTrace();
  20.             return false;
  21.         }
  22.     }
  23.     //从data.txt中去获取刚刚保存的账号密码
  24.     public static Map<String,String> getUserInfo(Context context) {
  25.         String content = "";
  26.         try {
  27.             FileInputStream fis = context.openFileInput("data.txt");
  28.             byte[] buffer = new byte[fis.available()];
  29.             fis.read(buffer);//读取
  30.             content = new String(buffer);
  31.             Map<String ,String > userMap = new HashMap<String, String>();
  32.             String[] infos = content.split(":");
  33.             userMap.put("number",infos[0]);
  34.             userMap.put("password",infos[1]);
  35.             fis.close();
  36.             return userMap;
  37.         }catch (Exception e){
  38.             e.printStackTrace();
  39.             return null;
  40.         }
  42.     }
  43. }

主页代码

  1. package com.example.remembernp;
  3. import androidx.appcompat.app.AppCompatActivity;
  5. import android.app.AlertDialog;
  6. import android.icu.util.LocaleData;
  7. import android.os.Bundle;
  8. import android.text.TextUtils;
  9. import android.util.Log;
  10. import android.view.View;
  11. import android.widget.Button;
  12. import android.widget.EditText;
  13. import android.widget.Toast;
  15. import org.json.JSONException;
  16. import org.json.JSONObject;
  18. import java.io.IOException;
  19. import java.io.UnsupportedEncodingException;
  20. import java.security.MessageDigest;
  21. import java.security.NoSuchAlgorithmException;
  22. import java.util.Map;
  24. import okhttp3.Call;
  25. import okhttp3.Callback;
  26. import okhttp3.MediaType;
  27. import okhttp3.OkHttpClient;
  28. import okhttp3.Request;
  29. import okhttp3.RequestBody;
  30. import okhttp3.Response;
  32. public class MainActivity extends AppCompatActivity implements View.OnClickListener{
  33.     private EditText etNumber;
  34.     private EditText etPassword;
  35.     private Button btnLogin;
  36.     private MediaType mediaType;
  37.     @Override
  38.     protected void onCreate(Bundle savedInstanceState) {
  39.         super.onCreate(savedInstanceState);
  40.         setContentView(R.layout.activity_main);
  41.         Button btn = (Button)findViewById(R.id.btn_login);
  42.         Map<String,String> userInfo = SaveFile.getUserInfo(this);
  43.         initView();
  44.         if(userInfo != null){
  45.             etNumber.setText(userInfo.get("number"));
  46.             etPassword.setText(userInfo.get("password"));
  47.         }
  48.     }
  50.     private void  initView(){
  51.         etNumber = (EditText)findViewById(R.id.et_number);
  52.         etPassword = (EditText)findViewById(R.id.et_password);
  53.         btnLogin = (Button)findViewById(R.id.btn_login);
  54.         btnLogin.setOnClickListener(this);
  55.     }
  57.     @Override
  58.     public void onClick(View view) {
  59.         //单击事件，获取账号密码
  60.         final String number = etNumber.getText().toString().trim();
  61.         String password = etPassword.getText().toString().trim();
  62.         //检查账号密码是否正确
  63.         if(TextUtils.isEmpty(number)){
  64.             Toast.makeText(this, "请输入账号", Toast.LENGTH_SHORT).show();
  65.             return;
  66.         }
  67.         if(TextUtils.isEmpty(password)){
  68.             Toast.makeText(this, "请输入密码", Toast.LENGTH_SHORT).show();
  69.             return;
  70.         }
  71.         okHttp(); //登录
  72.     }
  74.     private void okHttp(){
  75.         //单击事件，获取账号密码
  76.         final String number = etNumber.getText().toString().trim();
  77.         final String password = etPassword.getText().toString().trim();
  78.         //给密码加密
  79.         final String md5 = md5Decode(password + "dabsdafaqj23ou89ZXcj@#$@#$#@KJdjklj;D../dSF.,");
  80.         new Thread(new Runnable() {
  81.             @Override
  82.             public void run() {
  83.                 try {
  84.                     OkHttpClient client = new OkHttpClient();
  85.                     JSONObject jsonObject = new JSONObject();
  86.                     jsonObject.put("number",number);
  87.                     jsonObject.put("password",md5);
  88.                     mediaType = MediaType.parse("application/json;charest=utf-8");
  89.                     RequestBody requestBody = RequestBody.create(mediaType,jsonObject.toString());
  90.                     final Request request = new Request.Builder() .url("使用自己的登录网址")
  91.                             .post(requestBody).build();
  92.                     client.newCall(request).enqueue(new Callback() {
  93.                         @Override
  94.                         //请求失败
  95.                         public void onFailure(Call call, IOException e) {
  96.                             Log.d("请求失败","，返回码："+e.getMessage());
  97.                             loginRemind(400);
  98.                         }
  100.                         @Override
  101.                         //请求成功
  102.                         public void onResponse(Call call, final Response response) throws IOException {
  103.                             loginRemind(response.code());
  104.                             if(response.code() == 200){
  105.                                 Log.d("请求成功---------","后台返回数据："+response.body().string());
  106.                                 //保存账号密码
  107.                                 SaveFile.saveUserInfo(MainActivity.this,number,password);
  108.                             }else{
  109.                                 Log.d("请求成功-----但登录失败----返回码："+response.code(),"------失败原因："+response.body().string());
  110.                             }
  111.                         }
  112.                     });
  113.                 } catch (JSONException e) {
  114.                     e.printStackTrace();
  115.                 }
  116.             }
  117.         }).start();
  118.     }
  120.     public String md5Decode(String content) {
  121.         byte[] hash;
  122.         try {
  123.             hash = MessageDigest.getInstance("MD5").digest(content.getBytes("UTF-8"));
  124.         } catch (NoSuchAlgorithmException e) {
  125.             throw new RuntimeException("NoSuchAlgorithmException", e);
  126.         } catch (UnsupportedEncodingException e) {
  127.             throw new RuntimeException("UnsupportedEncodingException", e);
  128.         }
  129.         //对生成的16字节数组进行补零操作
  130.         StringBuilder hex = new StringBuilder(hash.length * 2);
  131.         for (byte b : hash) {
  132.             if ((b & 0xFF) < 0x10) {
  133.                 hex.append("0");
  134.             }
  135.             hex.append(Integer.toHexString(b & 0xFF));
  136.         }
  137.         return hex.toString();
  138.     }
  140.     private void loginRemind(final int num){
  141.         MainActivity.this.runOnUiThread(new Runnable() {
  142.             @Override
  143.             public void run() {
  144.                 switch (num){
  145.                     case 200:
  146.                         Toast.makeText(MainActivity.this, "登录成功", Toast.LENGTH_LONG).show();
  147.                         break;
  148.                     case 400:
  149.                         Toast.makeText(MainActivity.this, "请求失败", Toast.LENGTH_LONG).show();
  150.                         break;
  151.                     default:
  152.                         Toast.makeText(MainActivity.this, "请求成功，登录失败，返回码："+num, Toast.LENGTH_LONG).show();
  153.                         break;
  154.                 }
  155.             }
  156.         });
  157.     }
  158. }

转载于:https://www.cnblogs.com/Mr-Deng/p/11313961.html

发表评论

表情：
评论列表 （有 0 条评论，192人围观）

还没有评论，来说两句吧...

相关阅读