一、前言:
大家好,今天给大家分享一下Android中的拿来主义,我们时常会碰到一个自己觉得很漂亮很帅气的应用(apk),所以我们会尝试用WinRAR等之类工具查看,而一般的应用程序打包后的目录通常是这样的如下图:
当然res里的图片是可以拿来就用的(笔者的好多应用的图片都是从别人的apk里扣出来的),而诸如layout里的布局及权限文件 (AndroidManifest.xml)已经是一堆乱码了,完全看不懂,想看看别人是怎么布局的都不容易。还有源代码都被编译成了 classes.dex,完全看不出什么线索。基于以上的困惑,笔者给大家分享一下Android中的拿来主义。
二、所需工具(点击各自连接进入下载页面):
1.AXMLPrinter2.jar
2.baksmali.jar
3.smali.jar
三、准备工作
为了方便起见,作者把AXMLPrinter2.jar, 还有baksmali.jar,还有smali.jar(下下来为了方便重命名),放在Android SDK tools文件夹中如下图所示:
为了便于大家更容易程序比对,作者写了一个简单的应用(叫APKInstaller)目录结构如下图所示:
四、开始拿来主义
1.用 AXMLPrinter2.jar查看apk中的布局xml文件:
将ApkInstaller应用生成的ApkInstaller.apk(为了方便起见放到tools目录里)用WinRAR等工具打开,将res/layout/main.xml解压出来(也还是放在tools目录里哦)
打开main.xml文件,内容如下(一堆天文):
这时候AXMLPrinter2.jar派上用场了,打开cmd终端,一直进入到tools目录下,输入如下命令:
java -jar AXMLPrinter2.jar main.xml > main.txt. (如下图所示)
打开main.txt代码如下(是不是有个123了呵呵~):
[java] view plain copy print ?
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout
- xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="1"
- android:layout_width="-1"
- android:layout_height="-1"
- >
- <WebView
- android:id="@7F050000"
- android:layout_width="-1"
- android:layout_height="-2"
- >
- </WebView>
- </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="1" android:layout_width="-1" android:layout_height="-1" > <WebView android:id="@7F050000" android:layout_width="-1" android:layout_height="-2" > </WebView> </LinearLayout>
为了比对打开源程序中的main.xml代码如下(大家比对一下吧):
[java] view plain copy print ?
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <WebView
- android:id="@+id/apk_web"
- android:layout_height="wrap_content"
- android:layout_width="fill_parent"
-
- />
- </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <WebView android:id="@+id/apk_web" android:layout_height="wrap_content" android:layout_width="fill_parent" /> </LinearLayout>
2.用baksmali.jar反编译classes.dex:
将ApkInstaller.apk里的classes.dex解压到tools目录里,然后baksmali.jar就派上用场了,在cmd命令行里输入如下命令:
java -jar baksmali.jar -o classout/ classes.dex .(如下图所示:)
你将会发现在tools里多一个classout文件夹里面(我代码的包目录结构清晰可见呀),如下图所示:
从上面看出除了Android本身资源的类R开头的,我的源程序里只有一个ApkInstaller.java,完全吻合,真TMD的猥琐呵呵~
下面我们看一下ApkInstaller.smali内容是什么,如以下代码:
[java] view plain copy print ?
- .class public Lcom/tutor/apkinstaller/ApkInstaller;
- .super Landroid/app/Activity;
- .source "ApkInstaller.java"
- # instance fields
- .field private apkWeb:Landroid/webkit/WebView;
- # direct methods
- .method public constructor <init>()V
- .registers 1
- .prologue
- .line 8
- invoke-direct {p0}, Landroid/app/Activity;-><init>()V
- return-void
- .end method
- # virtual methods
- .method public onCreate(Landroid/os/Bundle;)V
- .registers 5
- .parameter "savedInstanceState"
- .prologue
- .line 13
- invoke-super {p0, p1}, Landroid/app/Activity;->onCreate(Landroid/os/Bundle;)V
- .line 14
- const/high16 v2, 0x7f03
- invoke-virtual {p0, v2}, Lcom/tutor/apkinstaller/ApkInstaller;->setContentView(I)V
- .line 15
- const/high16 v2, 0x7f05
- invoke-virtual {p0, v2}, Lcom/tutor/apkinstaller/ApkInstaller;->findViewById(I)Landroid/view/View;
- move-result-object v2
- check-cast v2, Landroid/webkit/WebView;
- iput-object v2, p0, Lcom/tutor/apkinstaller/ApkInstaller;->apkWeb:Landroid/webkit/WebView;
- .line 16
- iget-object v2, p0, Lcom/tutor/apkinstaller/ApkInstaller;->apkWeb:Landroid/webkit/WebView;
- invoke-virtual {v2}, Landroid/webkit/WebView;->getSettings()Landroid/webkit/WebSettings;
- move-result-object v1
- .line 17
- .local v1, webSettings:Landroid/webkit/WebSettings;
- const/4 v2, 0x1
- invoke-virtual {v1, v2}, Landroid/webkit/WebSettings;->setJavaScriptEnabled(Z)V
- .line 19
- const-string v0, "http://frankiewei.net/apk/demos/main/index.html#home"
- .line 20
- .local v0, apkUrl:Ljava/lang/String;
- iget-object v2, p0, Lcom/tutor/apkinstaller/ApkInstaller;->apkWeb:Landroid/webkit/WebView;
- invoke-virtual {v2, v0}, Landroid/webkit/WebView;->loadUrl(Ljava/lang/String;)V
- .line 21
- return-void
- .end method
.class public Lcom/tutor/apkinstaller/ApkInstaller; .super Landroid/app/Activity; .source "ApkInstaller.java" # instance fields .field private apkWeb:Landroid/webkit/WebView; # direct methods .method public constructor <init>()V .registers 1 .prologue .line 8 invoke-direct {p0}, Landroid/app/Activity;-><init>()V return-void .end method # virtual methods .method public onCreate(Landroid/os/Bundle;)V .registers 5 .parameter "savedInstanceState" .prologue .line 13 invoke-super {p0, p1}, Landroid/app/Activity;->onCreate(Landroid/os/Bundle;)V .line 14 const/high16 v2, 0x7f03 invoke-virtual {p0, v2}, Lcom/tutor/apkinstaller/ApkInstaller;->setContentView(I)V .line 15 const/high16 v2, 0x7f05 invoke-virtual {p0, v2}, Lcom/tutor/apkinstaller/ApkInstaller;->findViewById(I)Landroid/view/View; move-result-object v2 check-cast v2, Landroid/webkit/WebView; iput-object v2, p0, Lcom/tutor/apkinstaller/ApkInstaller;->apkWeb:Landroid/webkit/WebView; .line 16 iget-object v2, p0, Lcom/tutor/apkinstaller/ApkInstaller;->apkWeb:Landroid/webkit/WebView; invoke-virtual {v2}, Landroid/webkit/WebView;->getSettings()Landroid/webkit/WebSettings; move-result-object v1 .line 17 .local v1, webSettings:Landroid/webkit/WebSettings; const/4 v2, 0x1 invoke-virtual {v1, v2}, Landroid/webkit/WebSettings;->setJavaScriptEnabled(Z)V .line 19 const-string v0, "http://frankiewei.net/apk/demos/main/index.html#home" .line 20 .local v0, apkUrl:Ljava/lang/String; iget-object v2, p0, Lcom/tutor/apkinstaller/ApkInstaller;->apkWeb:Landroid/webkit/WebView; invoke-virtual {v2, v0}, Landroid/webkit/WebView;->loadUrl(Ljava/lang/String;)V .line 21 return-void .end method
同样为了比对我们看一下ApkInstaller.java的源代码如下:
[java] view plain copy print ?
- package com.tutor.apkinstaller;
- import android.app.Activity;
- import android.os.Bundle;
- import android.webkit.WebSettings;
- import android.webkit.WebView;
- public class ApkInstaller extends Activity {
-
- private WebView apkWeb;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- apkWeb = (WebView)findViewById(R.id.apk_web);
- WebSettings webSettings = apkWeb.getSettings();
- webSettings.setJavaScriptEnabled(true);
-
- String apkUrl = "http://frankiewei.net/apk/demos/main/index.html#home";
- apkWeb.loadUrl(apkUrl);
- }
- }
package com.tutor.apkinstaller; import android.app.Activity; import android.os.Bundle; import android.webkit.WebSettings; import android.webkit.WebView; public class ApkInstaller extends Activity { private WebView apkWeb; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); apkWeb = (WebView)findViewById(R.id.apk_web); WebSettings webSettings = apkWeb.getSettings(); webSettings.setJavaScriptEnabled(true); String apkUrl = "http://frankiewei.net/apk/demos/main/index.html#home"; apkWeb.loadUrl(apkUrl); } }
我相信大家 已经能看出来门道来了吧,hoho~
3.用smali.jar编译classout成classes.dex:
我们上一步已经将classes.dex反编译成了.smali文件,好了,我们看看smali文件看够了,在偿试把它编译成classes.dex吧,
输入如下命令:java -jar smali.jar classout/ -o classes.dex. 如下图所示:
我们可以将新生成的classes.dex塞入ApkInstaller.apk里覆盖原来的classes.dex文件,这样我们的apk还是一样能用的哦~
Ok~今天就暂时写到这里,这片文章真是不容易呀,写了这么长时间,之间还出现过被来自武汉IP的人把这篇文章删除 过,我又重新写了一遍。希望大家多多进步!thx~
http://blog.csdn.net/Android_Tutor/article/details/5724435