Android开发(6)--完成登陆界面的数据保存回显的操作
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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<String, String> 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;@Overrideprotected 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<String, String> map=fileService.readFile("private.txt");if(map!=null){edit_name.setText(map.get("name"));edit_pass.setText(map.get("pass"));}}@Overridepublic 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{@Overridepublic 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<String,String> readFile(String fileName){
- Map<String,String> map=null;
- 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.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<String,String> readFile(String fileName){Map<String,String> map=null;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;}}
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>
<RelativeLayout 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: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">login</string>
- <stringname="action_settings">Settings</string>
- <stringname="hello_world">Login</string>
- <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>
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