QQ登陆实现数据保存

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;
	@Override
	protected 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"));
		}
	}
	@Override
	public 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##123123
			String 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##123123
			String 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;
	}
}