Android 模拟登陆保存密码（信息）到手机中文件信息读取

package com.wuyou.login;import java.io.IOException;import java.util.Map;import android.app.Activity;import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.Menu;import android.view.View;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;import com.wuyou.service.LoginService;public class MainActivity extends Activity {    private CheckBox checkBox;    private EditText usernamEditText;    private EditText passwordeEditText;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        checkBox = (CheckBox) this.findViewById(R.id.cb);        usernamEditText = (EditText) this.findViewById(R.id.username);        passwordeEditText = (EditText) this.findViewById(R.id.password);        // 将之前保存在本地的账号密码取出并设置到文本框中        try {            Map<String, String> map = LoginService.getInfo(this);            usernamEditText.setText(map.get("username"));            passwordeEditText.setText(map.get("password"));        } catch (Exception e) {            Log.i("main", "取不出账号密码");        }    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    /**     * 点击“登陆”按钮触发的时间     *      * @param v     */    public void login(View v) {        Log.i("login", "在登陆中");        String username = usernamEditText.getText().toString().trim();        String password = passwordeEditText.getText().toString().trim();        if (TextUtils.isEmpty(username) || TextUtils.isEmpty(password)) {            Toast.makeText(this, "用户名和账号不能为空！", Toast.LENGTH_SHORT).show();        } else {            // 判断是否选择了记住密码            if (checkBox.isChecked()) {                try {                    LoginService.saveInfo(this, username, password);                    Toast.makeText(this, "记住密码成功！", Toast.LENGTH_SHORT).show();                } catch (IOException e) {                    Toast.makeText(this, "无法记住密码", Toast.LENGTH_SHORT).show();                }            }            if ("zhangsan".equals(username) && "123".equals(password)) {                Toast.makeText(this, "登陆成功！", Toast.LENGTH_SHORT).show();            } else {                Toast.makeText(this, "账号密码有误！", Toast.LENGTH_SHORT).show();            }        }    }}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="请输入账号" />    <EditText        android:id="@+id/username"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="请输入密码" />    <EditText        android:id="@+id/password"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="wrap_content" >        <CheckBox            android:id="@+id/cb"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:checked="true"            android:text="记住密码" />        <!-- 记住login的方法有一个参数View -->        <Button            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentRight="true"            android:onClick="login"            android:text="登陆" />    </RelativeLayout></LinearLayout>

package com.wuyou.service;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileWriter;import java.io.IOException;import java.io.InputStreamReader;import java.util.HashMap;import java.util.Map;import android.content.Context;public class LoginService {    public static void saveInfo(Context context, String username,            String password) throws IOException {        File file = new File(context.getFilesDir(), "info.txt");        FileWriter fileWriter = new FileWriter(file);        fileWriter.write(username + "##" + password);        fileWriter.close();    }    public static Map<String, String> getInfo(Context context)            throws IOException {
　　　　 //这里只做简单的保存，如果要保存配置文件信息，可以使用SharedPreference类保存，请关注本类别的该文章        File file = new File(context.getFilesDir(),"info.txt");        Map<String, String> map = new HashMap<String, String>();        BufferedReader bf = new BufferedReader(new InputStreamReader(                new FileInputStream(file)));        String info = bf.readLine();        String username = "";        String password = "";        if (info != null) {            String[] infos = info.split("##");            username = infos[0];            password = infos[1];            map.put("username", username);            map.put("password", password);                    }        bf.close();        return map;    }}

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