QQ登陆实现数据保存

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1.模拟QQ登陆，实现数据保存到内存中

package com.itheima28.qqlogin;import java.util.Map;import android.app.Activity;import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;import com.itheima28.qqlogin.utils.Utils;import com.itheima28.qqlogin.utils.UtilsOfSharedPreferences;public class MainActivity extends Activity implements OnClickListener {private static final String TAG = "MainActivity";private EditText etNumber;private EditText etPassword;private CheckBox cbRemerberPWD;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);etNumber = (EditText) findViewById(R.id.et_number);etPassword = (EditText) findViewById(R.id.et_password);cbRemerberPWD = (CheckBox) findViewById(R.id.cb_remerber_pwd);Button btnLogin = (Button) findViewById(R.id.btn_login);btnLogin.setOnClickListener(this);// 回显数据Map<String, String> userInfoMap = Utils.getUserInfo();if(userInfoMap != null) {etNumber.setText(userInfoMap.get("number"));etPassword.setText(userInfoMap.get("password"));}}@Overridepublic void onClick(View v) {// 执行登录的操作// 1. 取出号码和密码String number = etNumber.getText().toString();String password = etPassword.getText().toString();if(TextUtils.isEmpty(number) || TextUtils.isEmpty(password)) {// 弹出吐司Toast.makeText(this, "请正确输入", Toast.LENGTH_SHORT).show();return;}// 2. 判断记住密码是否被选中, 如果被选中, 存起来if(cbRemerberPWD.isChecked()) {// 当前需要记住密码Log.i(TAG, "记住密码: " + number + ", " + password); boolean isSuccess = Utils.saveUserInfo(number, password); if(isSuccess) { Toast.makeText(this, "保存成功", 0).show(); } else { Toast.makeText(this, "保存失败", 0).show(); }}// 3. 登陆成功Toast.makeText(this, "登录成功", 0).show();}}

public static boolean saveUserInfo(String number, String password) {try {String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";FileOutputStream fos = new FileOutputStream(path);// 307966990##123123String data = number + "##" + password;fos.write(data.getBytes());fos.flush();fos.close();return true;} catch (Exception e) {e.printStackTrace();}return false;}

/** * 返回用户信息 * @return */public static Map<String, String> getUserInfo() {try {String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";FileInputStream fis = new FileInputStream(path);// 字符流对象BufferedReader reader = new BufferedReader(new InputStreamReader(fis));// 307966990##123123String text = reader.readLine();if(!TextUtils.isEmpty(text)) {String[] split = text.split("##");Map<String, String> userInfoMap = new HashMap<String, String>();userInfoMap.put("number", split[0]);userInfoMap.put("password", split[1]);return userInfoMap;}} catch (Exception e) {e.printStackTrace();}return null;}

2.实现数据保存到SD卡

package com.itheima28.qqlogin.utils;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.InputStreamReader;import java.util.HashMap;import java.util.Map;import android.content.Context;import android.os.Environment;import android.text.TextUtils;public class UtilsOfSDCard {/** * 保存用户信息到sd卡 * @param number * @param password * @return true 成功 */public static boolean saveUserInfo(Context context, String number, String password) {try {// 判断当前的手机是否有sd卡String state = Environment.getExternalStorageState();if(!Environment.MEDIA_MOUNTED.equals(state)) {// 已经挂载了sd卡return false;}File sdCardFile = Environment.getExternalStorageDirectory();File file = new File(sdCardFile, "itheima28.txt");FileOutputStream fos = new FileOutputStream(file);String data = number + "##" + password;fos.write(data.getBytes());fos.flush();fos.close();return true;} catch (Exception e) {e.printStackTrace();}return false;}/** * 到sd卡获取用户信息 * @return */public static Map<String, String> getUserInfo(Context context) {try {// 判断当前的手机是否有sd卡String state = Environment.getExternalStorageState();if(!Environment.MEDIA_MOUNTED.equals(state)) {// 已经挂载了sd卡return null;}File sdCardFile = Environment.getExternalStorageDirectory();File file = new File(sdCardFile, "itheima28.txt");BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));String text = br.readLine();br.close();if(!TextUtils.isEmpty(text)) {Map<String, String> userInfoMap = new HashMap<String, String>();String[] split = text.split("##");userInfoMap.put("number", split[0]);userInfoMap.put("password", split[1]);return userInfoMap;}} catch (Exception e) {e.printStackTrace();}return null;}}

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