JAVA登陆界面的数据保存回显的操作.doc

1、计算机交流平台：计算机故障_计算机论坛www.it168 wyJAVA登陆界面的数据保存回显的操作 java IMG alt= src= java 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; impor

2、t 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; / 声明获取得用户与密码的组件 public EditText edit_name, edit_pass; / 声明登陆按钮对象 p

3、ublic Button btn_login; / 声明CheckBox组件对象 public CheckBox box_remember; Override protected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); / 设置显示视图 setContentView(R.layout.activity_login); / 实例化业务对象 fileService = new FileService(this); edit_name = (EditText) findViewById(

4、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 map = fileService.readFile(private.txt); if (map != nu

5、ll) 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 imp

6、lements 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

7、不能为空, Toast.LENGTH_LONG).show(); return; else / 如果记住密码勾选上了 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

8、密码不需要保存, Toast.LENGTH_LONG).show(); 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.But

9、ton;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;public class LoginActivity extends Activity public static FileService fileService = null; / 声明获取得用户与密码的组件 public EditText edit_name, edit_pass; / 声明登陆按钮对象 public Button btn_login; / 声明CheckBox组件对象 public Ch

10、eckBox box_remember; Override protected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); / 设置显示视图 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) findViewBy

11、Id(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 map = fileService.readFile(private.txt); if (map != null) edit_name.setText(map.get(edit_name); edit_pas

12、s.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

13、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

14、记住密码勾选上了 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(); java java java

15、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 FileServ

16、ice / 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()方法获取一个文件的输出流对象 File

17、OutputStream 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 readFile(String fileName) Map map =

18、 null;/ new HashMap(); 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, values0); map.put(pass, values1); catch (Exception e) e.printStackTrace(); return map; p

19、ackage 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 byte1024;

20、 int length = -1; while (length = fis.read(buffer) != -1) stream.write(buffer, 0, length); stream.flush(); stream.close(); String value = stream.toString(); return value; day02_file Settings Hello world! 用户名 密 码 登 陆 保存密码 htmlpackage com.example.lession02_file.service; import java.io.ByteArrayOutputS

21、tream; 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) th

22、is.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()方法获取一个文件的输出流对象 FileOutputStream fos = context.openFileOutput(fileName, Context.MODE_PRIVATE);

23、/ 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 readFile(String fileName) Map map = null;/ new HashMap(); try FileInputStream fis = context.openFileInput(file

24、Name); String value = StreamTools.getValue(fis); String values = value.split(:); if (values.length 0) map = new HashMap(); map.put(name, values0); map.put(pass, values1); catch (Exception e) e.printStackTrace(); return map; package com.example.lession02_file.service;import java.io.ByteArrayOutputStr

25、eam;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.contex

26、t = 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()方法获取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

27、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 readFile(String fileName) Map map = null;/ new HashMap(); try FileInputStream fis = context.openFileInput(fileName); St

28、ring value = StreamTools.getValue(fis); String values = value.split(:); if (values.length 0) map = new HashMap(); map.put(name, values0); map.put(pass, values1); catch (Exception e) e.printStackTrace(); return map; java java htmlpackage com.example.lession02_file.util; import java.io.ByteArrayOutputStream; import java.io.FileInputStream; public class StreamTools pub