1、用户类User
package com.example.logindemo;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class User {
private String mId;
private String mPwd;
private static final String masterPassword = “FORYOU”; // AES加密算法的种子
private static final String JSON_ID = “user_id”;
private static final String JSON_PWD = “user_pwd”;
private static final String TAG = “User”;
public User(String id, String pwd) {
this.mId = id;
this.mPwd = pwd;
}
public User(JSONObject json) throws Exception {
if (json.has(JSON_ID)) {
String id = json.getString(JSON_ID);
String pwd = json.getString(JSON_PWD);
// 解密后存放
mId = AESUtils.decrypt(masterPassword, id);
mPwd = AESUtils.decrypt(masterPassword, pwd);
}
}
public JSONObject toJSON() throws Exception {
// 使用AES加密算法加密后保存
String id = AESUtils.encrypt(masterPassword, mId);
String pwd = AESUtils.encrypt(masterPassword, mPwd);
Log.i(TAG, “加密后:” + id + " " + pwd);
JSONObject json = new JSONObject();
try {
json.put(JSON_ID, id);
json.put(JSON_PWD, pwd);
} catch (JSONException e) {
e.printStackTrace();
}
return json;
}
public String getId() {
return mId;
}
public String getPwd() {
return mPwd;
}
}
2、保存和加载本地User列表
package com.example.logindemo;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONTokener;
import android.content.Context;
import android.util.Log;
public class Utils {
private static final String FILENAME = “userinfo.json”; // 用户保存文件名
private static final String TAG = “Utils”;
Log.i(TAG, “正在保存”);
Writer writer = null;
OutputStream out = null;
JSONArray array = new JSONArray();
for (User user : users) {
array.put(user.toJSON());
}
try {
out = context.openFileOutput(FILENAME, Context.MODE_PRIVATE); // 覆盖
writer = new OutputStreamWriter(out);
Log.i(TAG, “json的值:” + array.toString());
writer.write(array.toString());
} finally {
if (writer != null)
writer.close();
}
}
FileInputStream in = null;
ArrayList users = new ArrayList();
try {
in = context.openFileInput(FILENAME);
BufferedReader reader = new BufferedReader(
new InputStreamReader(in));
StringBuilder jsonString = new StringBuilder();
JSONArray jsonArray = new JSONArray();
String line;
while ((line = reader.readLine()) != null) {
jsonString.append(line);
}
Log.i(TAG, jsonString.toString());
jsonArray = (JSONArray) new JSONTokener(jsonString.toString())
.nextValue(); // 把字符串转换成JSONArray对象
for (int i = 0; i < jsonArray.length(); i++) {
User user = new User(jsonArray.getJSONObject(i));
users.add(user);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return users;
}
}
3、AES加密/解密
package com.example.logindemo;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class AESUtils {
public static String encrypt(String seed, String cleartext)
throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext.getBytes());
return toHex(result);
}
public static String decrypt(String seed, String encrypted)
throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] enc = toByte(encrypted);
byte[] result = decrypt(rawKey, enc);
return new String(result);
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance(“AES”);
SecureRandom sr = SecureRandom.getInstance(“SHA1PRNG”, “Crypto”);
sr.setSeed(seed);
kgen.init(128, sr);
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, “AES”);
Cipher cipher = Cipher.getInstance(“AES”);
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(
new byte[cipher.getBlockSize()]));
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
private static byte[] decrypt(byte[] raw, byte[] encrypted)
throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, “AES”);
Cipher cipher = Cipher.getInstance(“AES”);
cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(
new byte[cipher.getBlockSize()]));
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
private static String toHex(String txt) {
return toHex(txt.getBytes());
}
private static String fromHex(String hex) {
return new String(toByte(hex));
}
private static byte[] toByte(String hexString) {
int len = hexString.length() / 2;
byte[] result = new byte[len];
for (int i = 0; i < len; i++)
result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2),
16).byteValue();
return result;
}
private static String toHex(byte[] buf) {
if (buf == null)
return “”;
StringBuffer result = new StringBuffer(2 * buf.length);
for (int i = 0; i < buf.length; i++) {
appendHex(result, buf[i]);
}
return result.toString();
}
private final static String HEX = “0123456789ABCDEF”;
private static void appendHex(StringBuffer sb, byte b) {
sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));
}
}
4、LoginActivity.java
package com.example.logindemo;
import java.util.ArrayList;
import android.app.Activity;
import android.app.Dialog;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.DisplayMetrics;
import android.uti 《Android学习笔记总结+最新移动架构视频+大厂安卓面试真题+项目实战源码讲义》无偿开源 徽信搜索公众号【编程进阶路】 l.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.PopupWindow.OnDismissListener;
import android.widget.TextView;
import android.widget.Toast;
public class LoginActivity extends Activity implements OnClickListener,
OnItemClickListener, OnDismissListener {
protected static final String TAG = “LoginActivity”;
private LinearLayout mLoginLinearLayout; // 登录内容的容器
private LinearLayout mUserIdLinearLayout; // 将下拉弹出窗口在此容器下方显示
private Animation mTranslate; // 位移动画
private Dialog mLoginingDlg; // 显示正在登录的Dialog
private EditText mIdEditText; // 登录ID编辑框
private EditText mPwdEditText; // 登录密码编辑框
private ImageView mMoreUser; // 下拉图标
