Android开发(6)--完成登陆界面的数据保存回显的操作

LoginActivity.java

package com.example.login;

import java.util.Map;

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;

import com.example.login.service.FileService;

public class LoginActivityextends Activity {

public EditText edit_name,edit_pass;
public Button btn_login;
public CheckBox box_remeber;

public FileService fileService;
@Override
protected  void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
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_remeber=(CheckBox) findViewById(R.id.cbx_remember);

btn_login.setOnClickListener(new MyOnClickListener());

Map map=fileService.readFile("private.txt");
if(map!=null){
edit_name.setText(map.get("name"));
edit_pass.setText(map.get("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;
}

class MyOnClickListenerimplements View.OnClickListener{

@Override
public void onClick(View v) {
int id=v.getId();
switch (id) {
case R.id.btn_login:
String name=edit_name.getText().toString();
String pass=edit_pass.getText().toString();
if(TextUtils.isEmpty(name)){
Toast.makeText(LoginActivity.this,"用户名不能为空", Toast.LENGTH_SHORT).show();
return;
}else if(TextUtils.isEmpty(pass)){
Toast.makeText(LoginActivity.this,"密码不能为空", Toast.LENGTH_SHORT).show();
return;
}else{
if(box_remeber.isChecked()){
LoginActivity.this.fileService.saveToRom(name, pass,"private.txt");
Toast.makeText(LoginActivity.this,"用户名和密码已保存", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(LoginActivity.this,"用户名和密码不需要保存", Toast.LENGTH_SHORT).show();
}
}
break;

default:
break;
}


/*if(id==btn_login.getId()){
String name=edit_name.getText().toString();
String pass=edit_pass.getText().toString();
if(TextUtils.isEmpty(name)){
Toast.makeText(LoginActivity.this, "用户名不能为空", Toast.LENGTH_SHORT).show();
return;
}else if(TextUtils.isEmpty(pass)){
Toast.makeText(LoginActivity.this, "密码不能为空", Toast.LENGTH_SHORT).show();
return;
}else{
if(box_remeber.isChecked()){
LoginActivity.this.fileService.saveToRom(name, pass, "private.txt");
Toast.makeText(LoginActivity.this, "用户名和密码已保存", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(LoginActivity.this, "用户名和密码不需要保存", Toast.LENGTH_SHORT).show();
}
}
}*/
}

}
}

package com.example.login;

import java.util.Map;

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;

import com.example.login.service.FileService;

public class LoginActivity extends Activity {

	public EditText edit_name,edit_pass;
	public Button btn_login;
	public CheckBox box_remeber;
	
	public FileService fileService;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_login);
		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_remeber=(CheckBox) findViewById(R.id.cbx_remember);
		
		btn_login.setOnClickListener(new MyOnClickListener());
		
		Map map=fileService.readFile("private.txt");
		if(map!=null){
			edit_name.setText(map.get("name"));
			edit_pass.setText(map.get("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;
	}

	class MyOnClickListener implements View.OnClickListener{

		@Override
		public void onClick(View v) {
			int id=v.getId();
			switch (id) {
			case R.id.btn_login:
				String name=edit_name.getText().toString();
				String pass=edit_pass.getText().toString();
				if(TextUtils.isEmpty(name)){
					Toast.makeText(LoginActivity.this, "用户名不能为空", Toast.LENGTH_SHORT).show();
					return;
				}else if(TextUtils.isEmpty(pass)){
					Toast.makeText(LoginActivity.this, "密码不能为空", Toast.LENGTH_SHORT).show();
					return;
				}else{
					if(box_remeber.isChecked()){
						LoginActivity.this.fileService.saveToRom(name, pass, "private.txt");
						Toast.makeText(LoginActivity.this, "用户名和密码已保存", Toast.LENGTH_SHORT).show();
					}else{
						Toast.makeText(LoginActivity.this, "用户名和密码不需要保存", Toast.LENGTH_SHORT).show();
					}
				}
				break;

			default:
				break;
			}
			
			
			/*if(id==btn_login.getId()){
				String name=edit_name.getText().toString();
				String pass=edit_pass.getText().toString();
				if(TextUtils.isEmpty(name)){
					Toast.makeText(LoginActivity.this, "用户名不能为空", Toast.LENGTH_SHORT).show();
					return;
				}else if(TextUtils.isEmpty(pass)){
					Toast.makeText(LoginActivity.this, "密码不能为空", Toast.LENGTH_SHORT).show();
					return;
				}else{
					if(box_remeber.isChecked()){
						LoginActivity.this.fileService.saveToRom(name, pass, "private.txt");
						Toast.makeText(LoginActivity.this, "用户名和密码已保存", Toast.LENGTH_SHORT).show();
					}else{
						Toast.makeText(LoginActivity.this, "用户名和密码不需要保存", Toast.LENGTH_SHORT).show();
					}
				}
			}*/
		}
		
	}
}

FileService.java

package com.example.login.service;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;

import com.example.login.utils.StreamTools;

import android.content.Context;

public class FileService {

public Context context;

public FileService(Context context) {
this.context = context;
}

public boolean saveToRom(String name,String pass,String fileName){
try{
FileOutputStream fos=context.openFileOutput(fileName, Context.MODE_PRIVATE);
String result=name+":"+pass;
fos.write(result.getBytes());
fos.flush();
fos.close();
}catch(Exception e){
e.printStackTrace();
return false;
}
return true;
}

public Map readFile(String fileName){
Map map=null;
try{
FileInputStream fis=context.openFileInput(fileName);
String value=StreamTools.getValue(fis);
String values[]=value.split(":");
if(values.length>0){
map=new HashMap();
map.put("name", values[0]);
map.put("pass", values[1]);
}

}catch(Exception e){
e.printStackTrace();
}
return map;
}

}

package com.example.login.service;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;

import com.example.login.utils.StreamTools;

import android.content.Context;

public class FileService {

	public Context context;

	public FileService(Context context) {
		this.context = context;
	}
	
	public boolean saveToRom(String name,String pass,String fileName){
		try{
			FileOutputStream fos=context.openFileOutput(fileName, Context.MODE_PRIVATE);
			String result=name+":"+pass;
			fos.write(result.getBytes());
			fos.flush();
			fos.close();
		}catch(Exception e){
			e.printStackTrace();
			return false;
		}
		return true;
	}
	
	public Map readFile(String fileName){
		Map map=null;
		try{
			FileInputStream fis=context.openFileInput(fileName);
			String value=StreamTools.getValue(fis);
			String values[]=value.split(":");
			if(values.length>0){
				map=new HashMap();
				map.put("name", values[0]);
				map.put("pass", values[1]);
			}
			
		}catch(Exception e){
			e.printStackTrace();
		}
		return map;
	}
	
}

StreamTools.java

package com.example.login.utils;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;

public class StreamTools {
public static String getValue(FileInputStream fis)throws Exception{
ByteArrayOutputStream stream=new ByteArrayOutputStream();
byte[] buffer=newbyte[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;
}
}

package com.example.login.utils;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;

public class StreamTools {
	public static String getValue(FileInputStream fis) throws Exception{
		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;
	}
}

login_activity.xml

<RelativeLayoutxmlns: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: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=".LoginActivity">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
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/text_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/text_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:layout_weight="0.17"
android:text="@string/text_login"/>

<CheckBox
android:id="@+id/cbx_remember"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="80dp"
android:text="@string/text_rember"/>

LinearLayout>

LinearLayout>

RelativeLayout>

String.xml

xmlversion="1.0"encoding="utf-8"?>
<resources>

<stringname="app_name">loginstring>
<stringname="action_settings">Settingsstring>
<stringname="hello_world">Loginstring>
<stringname="text_name">用户名:string>
<stringname="text_pass">密　码:string>
<stringname="text_login">登陆string>
<stringname="text_rember">记住密码string>
resources>