【Android安全】用户名密码校验实例代码开发及反编译代码

来源：互联网发布：千年升段算法编辑：程序博客网时间：2024/06/14 06:59

新建一个Android工程加入两个文本框和标签框，同时加两个按钮。

1、Activity_Main.xml布局代码如下：

2、MainActivity.java 中添加事件及校验判断如下红色字体为新增代码

package com.example.testtwo;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;

public class MainActivity extends Activity {

   private boolean checkSN(String userName, String passWord)
   {
       if(userName.equals(passWord))
       {
           return true;
       }
       return false;
   }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
       final EditText edit_UserName;
       final EditText edit_PassWd;
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); //启动时设置布局
        /*code by myself*/
        edit_UserName = (EditText)findViewById(R.id.editText1);
        edit_PassWd = (EditText)findViewById(R.id.editText2);
        Button btn_OK = (Button)findViewById(R.id.button2);
        Button btn_Exit = (Button)findViewById(R.id.button1);

        btn_OK.setOnClickListener(new OnClickListener(){
           public void onClick(View v){
               if(checkSN(edit_UserName.getText().toString().trim(),edit_PassWd.getText().toString().trim() ))
               {
                   Toast.makeText(MainActivity.this, "success!", Toast.LENGTH_SHORT).show();
               }
               else
               {
                   Toast.makeText(MainActivity.this, "fail!", Toast.LENGTH_SHORT).show();
               }
           }
        });
        btn_Exit.setOnClickListener(new OnClickListener(){
           public void onClick(View v){
               return;
           }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

3、在bin下找到apk文件，利用apktool反编译apk，得到main_activity.smali内容如下，后续再分析。

.class public Lcom/example/testtwo/MainActivity;
.super Landroid/app/Activity;
.source "MainActivity.java"

# direct methods
.method public constructor <init>()V
    .locals 0

    .prologue
    .line 10
    invoke-direct {p0}, Landroid/app/Activity;-><init>()V

    return-void
.end method

.method static synthetic access$0(Lcom/example/testtwo/MainActivity;Ljava/lang/String;Ljava/lang/String;)Z
    .locals 1
    .parameter
    .parameter
    .parameter

    .prologue
    .line 12
    invoke-direct {p0, p1, p2}, Lcom/example/testtwo/MainActivity;->checkSN(Ljava/lang/String;Ljava/lang/String;)Z

    move-result v0

    return v0
.end method

.method private checkSN(Ljava/lang/String;Ljava/lang/String;)Z
    .locals 1
    .parameter "userName"
    .parameter "passWord"

    .prologue
    .line 14
    invoke-virtual {p1, p2}, Ljava/lang/String;->equals(Ljava/lang/Object;)Z

    move-result v0

    if-eqz v0, :cond_0

    .line 16
    const/4 v0, 0x1

    .line 18
    :goto_0
    return v0

    :cond_0
    const/4 v0, 0x0

    goto :goto_0
.end method

# virtual methods
.method protected onCreate(Landroid/os/Bundle;)V
    .locals 5
    .parameter "savedInstanceState"

    .prologue
    .line 24
    invoke-super {p0, p1}, Landroid/app/Activity;->onCreate(Landroid/os/Bundle;)V

    .line 25
    const/high16 v4, 0x7f03

    invoke-virtual {p0, v4}, Lcom/example/testtwo/MainActivity;->setContentView(I)V

    .line 27
    const v4, 0x7f080004

    invoke-virtual {p0, v4}, Lcom/example/testtwo/MainActivity;->findViewById(I)Landroid/view/View;

    move-result-object v3

    check-cast v3, Landroid/widget/EditText;

    .line 28
    .local v3, edit_UserName:Landroid/widget/EditText;
    const v4, 0x7f080005

    invoke-virtual {p0, v4}, Lcom/example/testtwo/MainActivity;->findViewById(I)Landroid/view/View;

    move-result-object v2

    check-cast v2, Landroid/widget/EditText;

    .line 29
    .local v2, edit_PassWd:Landroid/widget/EditText;
    const v4, 0x7f080002

    invoke-virtual {p0, v4}, Lcom/example/testtwo/MainActivity;->findViewById(I)Landroid/view/View;

    move-result-object v1

    check-cast v1, Landroid/widget/Button;

    .line 30
    .local v1, btn_OK:Landroid/widget/Button;
    const v4, 0x7f080003

    invoke-virtual {p0, v4}, Lcom/example/testtwo/MainActivity;->findViewById(I)Landroid/view/View;

    move-result-object v0

    check-cast v0, Landroid/widget/Button;

    .line 32
    .local v0, btn_Exit:Landroid/widget/Button;
    new-instance v4, Lcom/example/testtwo/MainActivity$1;

    invoke-direct {v4, p0, v3, v2}, Lcom/example/testtwo/MainActivity$1;-><init>(Lcom/example/testtwo/MainActivity;Landroid/widget/EditText;Landroid/widget/EditText;)V

    invoke-virtual {v1, v4}, Landroid/widget/Button;->setOnClickListener(Landroid/view/View$OnClickListener;)V

    .line 44
    new-instance v4, Lcom/example/testtwo/MainActivity$2;

    invoke-direct {v4, p0}, Lcom/example/testtwo/MainActivity$2;-><init>(Lcom/example/testtwo/MainActivity;)V

    invoke-virtual {v0, v4}, Landroid/widget/Button;->setOnClickListener(Landroid/view/View$OnClickListener;)V

    .line 49
    return-void
.end method

.method public onCreateOptionsMenu(Landroid/view/Menu;)Z
    .locals 2
    .parameter "menu"

    .prologue
    .line 55
    invoke-virtual {p0}, Lcom/example/testtwo/MainActivity;->getMenuInflater()Landroid/view/MenuInflater;

    move-result-object v0

    const/high16 v1, 0x7f07

    invoke-virtual {v0, v1, p1}, Landroid/view/MenuInflater;->inflate(ILandroid/view/Menu;)V

    .line 56
    const/4 v0, 0x1

    return v0
.end method

4、APKTool下载地址http://www.newasp.net/soft/68139.html或http://vdisk.weibo.com/s/BG3isR06dq011下载后修改批处理脚本使用即可
decode
该命令用于进行反编译apk文件，一般用法为
apktool d <file.apk> <dir>
<file.apk>代表了要反编译的apk文件的路径，最好写绝对路径，比如C:\MusicPlayer.apk
<dir>代表了反编译后的文件的存储位置，比如C:\MusicPlayer
如果你给定的<dir>已经存在，那么输入完该命令后会提示你，并且无法执行，需要你重新修改命令加入-f指令
apktool d –f <file.apk> <dir>
这样就会强行覆盖已经存在的文件
build
该命令用于编译修改好的文件，一般用法为
apktool b <dir>
这里的<dir>就是刚才你反编译时输入的<dir>（如C:\MusicPlayer）,输入这行命令后，如果一切正常，你会发现C:\MusicPlayer内多了2个

文件夹build和dist，其中分别存储着编译过程中逐个编译的文件以及最终打包的apk文件。
install
install-framework命令用于为APKTool安装特定的framework-res.apk文件，以方便进行反编译一些与ROM相互依赖的APK文件。

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