最近使用开发的过程中出现了一个小问题，顺便记录一下原因和方法--密码对象
package com.example.day02_file;
import java.util.Map;
import com.example.lession02_file.service.FileService;
import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;
public class LoginActivity extends Activity {
public static FileService fileService = null;
// 声明获得得用户与密码的组件
public EditText edit_name, edit_pass;
// 声明登岸按钮对象
public Button btn_login;
// 声明CheckBox组件对象
public CheckBox box_remember;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 设置表现视图
setContentView(R.layout.activity_login);
// 实例化业务对象
fileService = new FileService(this);
edit_name = (EditText) findViewById(R.id.edit_name);
edit_pass = (EditText) findViewById(R.id.edit_pass);
btn_login = (Button) findViewById(R.id.btn_login);
box_remember = (CheckBox) findViewById(R.id.file_Chickbox);
btn_login.setOnClickListener(new MyOnClickListener());
// 回显数据
Map<String, String> map = fileService.readFile("private.txt");
if (map != null) {
edit_name.setText(map.get("edit_name"));
edit_pass.setText(map.get("edit_pass"));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.login, menu);
return true;
}
// 内部类
class MyOnClickListener implements View.OnClickListener {
@Override
public void onClick(View v) {
int id = v.getId();
if (id == btn_login.getId()) {
String name = edit_name.getText().toString();
String pass = edit_pass.getText().toString();
if (TextUtils.isEmpty(name) || TextUtils.isEmpty(pass)) {
Toast.makeText(LoginActivity.this, "用户名或密码不能为空",
Toast.LENGTH_LONG).show();
return;
} else {
// 如果记着密码勾选上了
if (box_remember.isChecked()) {
// 进行保存
// 调用业务对象的业务方法
LoginActivity.this.fileService.saveToRom(name, pass,
"private.txt");
Toast.makeText(LoginActivity.this, "用户名和密码需要保存",
Toast.LENGTH_LONG).show();
} else {
// 不保存
Toast.makeText(LoginActivity.this, "用户名和密码不需要保存",
Toast.LENGTH_LONG).show();
}
}
}
}
}
}
package com.example.lession02_file.service;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;
import com.example.lession02_file.util.StreamTools;
import android.content.Context;
public class FileService {
// 上下文的对象
public Context context;
public FileService(Context context) {
this.context = context;
}
/**
* 往手机内存上存储用户名与密码的操作
*
* @param name
* @param pass
* @param fileName
* @return
*/
public boolean saveToRom(String name, String pass, String fileName) {
// 上下文对象的api
try {
// 通过openFileOutput()方法获得一个文件的输出流对象
FileOutputStream fos = context.openFileOutput(fileName,
Context.MODE_PRIVATE);
// 拼接用户名与密码
String result = name + ":" + pass;
// 写入
fos.write(result.getBytes());
fos.flush();
fos.close();
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
// 读取数据
public Map<String, String> readFile(String fileName) {
Map<String, String> map = null;// new HashMap<String, String>();
try {
FileInputStream fis = context.openFileInput(fileName);
String value = StreamTools.getValue(fis);
String values[] = value.split(":");
if (values.length > 0) {
map = new HashMap<String, String>();
map.put("name", values[0]);
map.put("pass", values[1]);
}
} catch (Exception e) {
e.printStackTrace();
}
return map;
}
}
package com.example.lession02_file.util;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
public class StreamTools {
public static String getValue(FileInputStream fis) throws Exception {
//字节的输出流对象
ByteArrayOutputStream stream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int length = -1;
while ((length = fis.read(buffer)) != -1) {
stream.write(buffer, 0, length);
}
stream.flush();
stream.close();
String value = stream.toString();
return value;
}
}
<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" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/View_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/file_name" />
<EditText
android:id="@+id/edit_name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="textPersonName" >
<requestFocus />
</EditText>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/View_pass"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/file_pass" />
<EditText
android:id="@+id/edit_pass"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="textPassword" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="@+id/btn_login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btn_login" />
<CheckBox
android:id="@+id/file_Chickbox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/file_Chickbox" />
</LinearLayout>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">day02_file</string>
<string name="action_settings">Settings</string>
<string name="hello_world">Hello world!</string>
<string name="file_name">用户名</string>
<string name="file_pass">密 码</string>
<string name="btn_login">登 陆</string>
<string name="file_Chickbox">保存密码</string>
<string name="file_text1"></string>
<string name="file_text2"></string>
</resources>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.day02_file"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.day02_file.LoginActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
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密码和对象
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