Android开发之完成登陆界面的数据保存回显操作实例

本文实例讲述了android开发之完成登陆界面的数据保存回显操作。分享给大家供大家参考，具体如下：

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 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<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 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<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=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：

<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>

希望本文所述对大家android程序设计有所帮助。