android文件存储和SharedPreferences存储的项目实例 android文件存储和SharedPreferenc

该实例为课程作业，请尊重劳动成果。
演示

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【文件存储】中查看设备保存的文件
【android文件存储和SharedPreferences存储的项目实例】
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目录

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activity_main

MainActivity

/** * 文件存储和SharedPreferences存储实例 */public class MainActivity extends AppCompatActivity {private EditText et_account, et_password; //账号输入框、密码输入框private Button loginBtn; //登录按钮@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); }private void initView() {et_account = findViewById(R.id.et_account); et_password = findViewById(R.id.et_password); loginBtn = findViewById(R.id.btn_login); //点击监听事件loginBtn.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {switch (view.getId()) {case R.id.btn_login://当点击登录按钮时，获取界面上输入的 QQ 账号和密码String account = et_account.getText().toString().trim(); String password = et_password.getText().toString(); //检验输入的账号和密码是否为空if (TextUtils.isEmpty(account)) {Toast.makeText(getApplicationContext(), "请输入 QQ 账号", Toast.LENGTH_SHORT).show(); return; }if (TextUtils.isEmpty(password)) {Toast.makeText(getApplicationContext(), "请输入密码", Toast.LENGTH_SHORT).show(); return; }//文件存储//saveOfFile(account,password); //SharedPreferences存储saveOfSharedPreferences(account,password); break; }}}); }//SharedPreferences存储private void saveOfSharedPreferences(String account, String password) {//获取 QQ 账号和密码信息SharedPreferences userInfo=SPSaveQQ.getUserInfo(getApplicationContext()); if (userInfo.getString("username", "") != null&&userInfo.getString("pwd", "") != null) {String username = userInfo.getString("username", ""); //读取账号String pwd = userInfo.getString("pwd", ""); //读取密码Log.i("user", "读取用户信息"); Log.i("user", "username:" + username + "， pwd:" + pwd); if (username.equals(account) && pwd.equals(password)) {Toast.makeText(getApplicationContext(), username+"登录成功!", Toast.LENGTH_SHORT).show(); }else {Log.i("user", "用户或密码错误！"); //保存用户信息boolean isSaveSuccess = SPSaveQQ.saveUserInfo(getApplicationContext(), account, password); if (isSaveSuccess) {Toast.makeText(getApplicationContext(), "保存成功!", Toast.LENGTH_SHORT).show(); } else {Toast.makeText(getApplicationContext(), "保存失败!", Toast.LENGTH_SHORT).show(); }}}else{//保存用户信息boolean isSaveSuccess = SPSaveQQ.saveUserInfo(getApplicationContext(), account, password); if (isSaveSuccess) {Toast.makeText(getApplicationContext(), "保存成功!", Toast.LENGTH_SHORT).show(); } else {Toast.makeText(getApplicationContext(), "保存失败!", Toast.LENGTH_SHORT).show(); }}}//文件存储private void saveOfFile(String account, String password) {//获取 QQ 账号和密码信息Map userInfo = FileSaveQQ.getUserInfo(getApplicationContext()); if (userInfo != null) {//将获取的账号显示到界面上et_account.setText(userInfo.get("account")); //将获取的密码显示到界面上et_password.setText(userInfo.get("password")); Toast.makeText(getApplicationContext(), userInfo.get("account")+"登录成功!", Toast.LENGTH_SHORT).show(); }else{//保存用户信息boolean isSaveSuccess = FileSaveQQ.saveUserInfo(getApplicationContext(), account, password); if (isSaveSuccess) {Toast.makeText(getApplicationContext(), "保存成功!", Toast.LENGTH_SHORT).show(); } else {Toast.makeText(getApplicationContext(), "保存失败!", Toast.LENGTH_SHORT).show(); }}}}

FileSaveQQ

/** * 实现 QQ 账号与密码的文件存取与读取功能 */public class FileSaveQQ {/*** 保存用户信息* @param context* @param account 账号* @param password 密码* @return*/public static boolean saveUserInfo(Context context, String account, String password) {//文件的输出流对象FileOutputStream fos = null; try {//获取文件的输出流对象 fos,该文件只能被当前程序读写fos = context.openFileOutput("user.txt",Context.MODE_PRIVATE); //将数据转换为字节码的形式写入 user.txt 文件中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(); }}}/*** 从 user.txt 文件中获取存储的用户信息* @param context* @return*/public static Map getUserInfo(Context context) {String content = ""; //文件的输入流对象FileInputStream fis = null; try {//获取文件的输入流对象 fisfis = context.openFileInput("user.txt"); //将输入流对象中的数据转换为字节码的形式byte[] buffer = new byte[fis.available()]; //通过 read()方法读取字节码中的数据fis.read(buffer); //将获取的字节码转换为字符串content = new String(buffer); Map userMap = new HashMap(); String[] infos = content.split(":"); //放入账号密码userMap.put("account", infos[0]); userMap.put("password", infos[1]); Log.i("user", "读取用户信息"); Log.i("user", "account:" + infos[0] + "， password:" + infos[1]); return userMap; } catch (Exception e) {e.printStackTrace(); return null; } finally {try {if (fis != null) {fis.close(); }} catch (IOException e) {e.printStackTrace(); }}}}

SPSaveQQ

/** * 实现 QQ 账号与密码SharedPreferences的存取与读取功能 */public class SPSaveQQ {/*** 保存用户信息*/public static boolean saveUserInfo(Context context, String account, String password){SharedPreferences sharedPreferences = null; try {sharedPreferences = context.getSharedPreferences("user", Context.MODE_PRIVATE); SharedPreferences.Editor editor = sharedPreferences.edit(); //获取编辑器editor.putString("username", account); editor.putString("pwd", password); editor.commit(); //提交修改return true; }catch (Exception e){e.printStackTrace(); return false; }finally {if(sharedPreferences != null){return true; }return false; }}/*** 读取用户信息*/public static SharedPreferences getUserInfo(Context context){SharedPreferences userInfo = context.getSharedPreferences("user", Context.MODE_PRIVATE); return userInfo; }}

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