Android代码混淆前后分析

为了方便站在巨人臂膀上研读源码，特地将自己写的源码进行混淆之后与源码进行比较。

使用混淆的方法在project.properties文件上加入

[plain] view plaincopyprint?
  1. proguard.config=proguard.cfg

这一条代码。关于如何反编译源码，请看之前的一篇博客如何反编绎APK文件。

一、代码结构

1、源码

2、未带混淆机制代码


3、混淆后的代码


从图中可以看出未带混淆机制的代码基本上与源码的结构相同，同时加入了R文件和android.annotation包。而混淆之后的代码删除了TestCommon文件，因为没有任何其他的文件使用到了这个文件当中的方法，因此使用混淆机制后其被删除。

二、MyTabHost代码分析

1、MyTabHost源码

[java] view plaincopyprint?
  1. package com.yang.confusion;
  3. import android.content.Context;
  4. import android.util.AttributeSet;
  5. import android.widget.TabHost;
  7. public class MyTabHost extends TabHost {
  9. public MyTabHost(Context context) {
  10. super(context);
  11. }
  13. public MyTabHost(Context context, AttributeSet attrs) {
  14. super(context, attrs);
  15. }
  17. public TabSpec setIndicator(CharSequence label) {
  18. return null;
  19. }
  20. private String str = null;
  21. private static final int FLAG = 1;
  23. //测试if
  24. public void testIf() {
  25. if (str == null) {
  26. System.out.println("空");
  27. }
  28. }
  30. /**
  31. * 测试IfElse
  32. */
  33. public void testIfElse() {
  34. if (str == null) {
  35. System.out.println("空");
  36. } else {
  37. System.out.println("不空");
  38. }
  39. }
  41. public void testIfWhile() {
  42. if (str == null) {
  43. while (str == null) {
  44. System.out.println("空");
  45. }
  46. }
  47. }
  49. public void testIfDoWhile() {
  50. if (str == null) {
  51. do {
  52. System.out.println("空");
  53. } while (str == null);
  54. }
  55. }
  57. public void testFor() {
  58. for (int i = 0; i < 10; i++) {
  59. System.out.println("asdf");
  60. }
  61. }
  63. public void testForIf() {
  64. for (int i = 0; i < 10; i++) {
  65. if (i == 1) {
  66. System.out.println("asdf");
  67. }
  68. }
  69. }
  71. public void testWhile() {
  72. while (str == null) {
  73. System.out.println("空");
  74. }
  75. }
  77. @SuppressWarnings("unused")
  78. private void testSwitch(int key) {
  79. switch (key) {
  80. case FLAG:
  82. break;
  84. default:
  85. break;
  86. }
  87. }
  90. }TestActivity

2、未带混淆机制MyTabHost代码

[java] view plaincopyprint?
  1. package com.yang.confusion;
  3. import android.content.Context;
  4. import android.util.AttributeSet;
  5. import android.widget.TabHost;
  6. import android.widget.TabHost.TabSpec;
  7. import java.io.PrintStream;
  9. public class MyTabHost extends TabHost
  10. {
  11. private static final int FLAG = 1;
  12. private String str = null;
  14. public MyTabHost(Context paramContext)
  15. {
  16. super(paramContext);
  17. }
  19. public MyTabHost(Context paramContext, AttributeSet paramAttributeSet)
  20. {
  21. super(paramContext, paramAttributeSet);
  22. }
  24. private void testSwitch(int paramInt)
  25. {
  26. switch (paramInt)
  27. {
  28. case 1:
  29. }
  30. }
  32. public TabHost.TabSpec setIndicator(CharSequence paramCharSequence)
  33. {
  34. return null;
  35. }
  37. public void testFor()
  38. {
  39. for (int i = 0; ; i++)
  40. {
  41. if (i >= 10)
  42. return;
  43. System.out.println("asdf");
  44. }
  45. }
  47. public void testForIf()
  48. {
  49. for (int i = 0; ; i++)
  50. {
  51. if (i >= 10)
  52. return;
  53. if (i != 1)
  54. continue;
  55. System.out.println("asdf");
  56. }
  57. }
  59. public void testIf()
  60. {
  61. if (this.str == null)
  62. System.out.println("空");
  63. }
  65. public void testIfDoWhile()
  66. {
  67. if (this.str == null)
  68. do
  69. System.out.println("空");
  70. while (this.str == null);
  71. }
  73. public void testIfElse()
  74. {
  75. if (this.str == null)
  76. System.out.println("空");
  77. while (true)
  78. {
  79. return;
  80. System.out.println("不空");
  81. }
  82. }
  84. public void testIfWhile()
  85. {
  86. if (this.str == null);
  87. while (true)
  88. {
  89. if (this.str != null)
  90. return;
  91. System.out.println("空");
  92. }
  93. }
  95. public void testWhile()
  96. {
  97. while (true)
  98. {
  99. if (this.str != null)
  100. return;
  101. System.out.println("空");
  102. }
  103. }
  104. }

3、混淆后的MyTabHost代码

[java] view plaincopyprint?
  1. package com.yang.confusion;
  3. import android.content.Context;
  4. import android.util.AttributeSet;
  5. import android.widget.TabHost;
  7. public class MyTabHost extends TabHost
  8. {
  9. private String a = null;
  11. public MyTabHost(Context paramContext, AttributeSet paramAttributeSet)
  12. {
  13. super(paramContext, paramAttributeSet);
  14. }
  15. }
从中可以看出，只要源码没有进行混淆设置，还是可以读懂的。没有混淆机制的代码，对源码进行相应的改动，具体改动的目的不知道，但是还是可以看懂的。而对于混淆后的代码，对源代码进行了进一步的缩减，对源码当中没有使用到的方法全部删除。【成都安卓培训】

三、TestActivity代码分析

1、TestActivity源码

[java] view plaincopyprint?
  1. package com.yang.confusion;
  3. import android.app.Activity;
  4. import android.os.Bundle;
  6. public class TestActivity extends Activity {
  7. @Override
  8. protected void onCreate(Bundle savedInstanceState) {
  9. super.onCreate(savedInstanceState);
  10. testIf();
  11. testIfElse();
  12. testIfWhile();
  13. testIfDoWhile();
  14. testFor();
  15. testForIf();
  16. testWhile();
  17. testSwitch(2);
  18. }
  19. private String str = null;
  20. private static final int FLAG = 1;
  22. //测试if
  23. public void testIf() {
  24. if (str == null) {
  25. System.out.println("空");
  26. }
  27. }
  29. /**
  30. * 测试IfElse
  31. */
  32. public void testIfElse() {
  33. if (str == null) {
  34. System.out.println("空");
  35. } else {
  36. System.out.println("不空");
  37. }
  38. }
  40. public void testIfWhile() {
  41. if (str == null) {
  42. while (str == null) {
  43. System.out.println("空");
  44. }
  45. }
  46. }
  48. public void testIfDoWhile() {
  49. if (str == null) {
  50. do {
  51. System.out.println("空");
  52. } while (str == null);
  53. }
  54. }
  56. public void testFor() {
  57. for (int i = 0; i < 10; i++) {
  58. System.out.println("asdf");
  59. }
  60. }
  62. public void testForIf() {
  63. for (int i = 0; i < 10; i++) {
  64. if (i == 1) {
  65. System.out.println("asdf");
  66. }
  67. }
  68. }
  70. public void testWhile() {
  71. while (str == null) {
  72. System.out.println("空");
  73. }
  74. }
  76. private void testSwitch(int key) {
  77. switch (key) {
  78. case FLAG:
  80. break;
  82. default:
  83. break;
  84. }
  85. }
  87. }

2、未带混淆机制的TestActivity代码

[java] view plaincopyprint?
  1. package com.yang.confusion;
  3. import android.app.Activity;
  4. import android.os.Bundle;
  5. import java.io.PrintStream;
  7. public class TestActivity extends Activity
  8. {
  9. private static final int FLAG = 1;
  10. private String str = null;
  12. private void testSwitch(int paramInt)
  13. {
  14. switch (paramInt)
  15. {
  16. case 1:
  17. }
  18. }
  20. protected void onCreate(Bundle paramBundle)
  21. {
  22. super.onCreate(paramBundle);
  23. testIf();
  24. testIfElse();
  25. testIfWhile();
  26. testIfDoWhile();
  27. testFor();
  28. testForIf();
  29. testWhile();
  30. testSwitch(2);
  31. }
  33. public void testFor()
  34. {
  35. for (int i = 0; ; i++)
  36. {
  37. if (i >= 10)
  38. return;
  39. System.out.println("asdf");
  40. }
  41. }
  43. public void testForIf()
  44. {
  45. for (int i = 0; ; i++)
  46. {
  47. if (i >= 10)
  48. return;
  49. if (i != 1)
  50. continue;
  51. System.out.println("asdf");
  52. }
  53. }
  55. public void testIf()
  56. {
  57. if (this.str == null)
  58. System.out.println("空");
  59. }
  61. public void testIfDoWhile()
  62. {
  63. if (this.str == null)
  64. do
  65. System.out.println("空");
  66. while (this.str == null);
  67. }
  69. public void testIfElse()
  70. {
  71. if (this.str == null)
  72. System.out.println("空");
  73. while (true)
  74. {
  75. return;
  76. System.out.println("不空");
  77. }
  78. }
  80. public void testIfWhile()
  81. {
  82. if (this.str == null);
  83. while (true)
  84. {
  85. if (this.str != null)
  86. return;
  87. System.out.println("空");
  88. }
  89. }
  91. public void testWhile()
  92. {
  93. while (true)
  94. {
  95. if (this.str != null)
  96. return;
  97. System.out.println("空");
  98. }
  99. }
  100. }

3、混淆后的TestActivity代码 【成都安卓培训】

[java] view plaincopyprint?
  1. package com.yang.confusion;
  3. import android.app.Activity;
  4. import android.os.Bundle;
  5. import java.io.PrintStream;
  7. public class TestActivity extends Activity
  8. {
  9. private String a = null;
  11. protected void onCreate(Bundle paramBundle)
  12. {
  13. int i = 0;
  14. super.onCreate(paramBundle);
  15. if (this.a == null)
  16. System.out.println("空");
  17. label44: int j;
  18. if (this.a == null)
  19. {
  20. System.out.println("空");
  21. if (this.a == null)
  22. if (this.a == null)
  23. break label106;
  24. if (this.a == null)
  25. do
  26. System.out.println("空");
  27. while (this.a == null);
  28. j = 0;
  29. label75: if (j < 10)
  30. break label117;
  31. label81: if (i < 10)
  32. break label131;
  33. }
  34. while (true)
  35. {
  36. if (this.a != null)
  37. {
  38. return;
  39. System.out.println("不空");
  40. break;
  41. label106: System.out.println("空");
  42. break label44;
  43. label117: System.out.println("asdf");
  44. j++;
  45. break label75;
  46. label131: if (i == 1)
  47. System.out.println("asdf");
  48. i++;
  49. break label81;
  50. }
  51. System.out.println("空");
  52. }
  53. }
  54. }

四、MainTabHostActivity代码分析

1、MainTabHostActivity源码

[java] view plaincopyprint?
  1. package com.yang.tabhost;
  2. import android.app.TabActivity;
  3. import android.content.Intent;
  4. import android.graphics.Color;
  5. import android.os.Bundle;
  6. import android.view.View;
  7. import android.view.Window;
  8. import android.widget.ImageView;
  9. import android.widget.RelativeLayout;
  10. import android.widget.TabHost;
  11. import android.widget.TabWidget;
  12. import android.widget.TextView;
  13. /**
  14. *
  15. * @Title: MainTabHostActivity.java
  16. * @Package com.yang.tabhost
  17. * @Description: MainTabHostActivity
  18. *
  19. */
  20. public class MainTabHostActivity extends TabActivity {
  21. private TabHost tabHost;
  22. private TabWidget tabWidget;
  24. @Override
  25. protected void onCreate(Bundle savedInstanceState) {
  26. super.onCreate(savedInstanceState);
  27. // No Title bar
  28. requestWindowFeature(Window.FEATURE_NO_TITLE);
  29. requestWindowFeature(Window.FEATURE_PROGRESS);
  30. setContentView(R.layout.main_layout);
  31. makeTab();
  32. }
  34. private void makeTab() {
  35. if (this.tabHost == null) {
  36. tabHost = getTabHost();
  37. tabWidget = getTabWidget();
  38. tabHost.setup();
  39. tabHost.bringToFront();
  41. setupChild1();
  42. setupChild2();
  43. }
  45. for (int i = 0; i < tabWidget.getChildCount(); i++) {
  46. TextView tv = (TextView) tabWidget.getChildAt(i).findViewById(
  47. android.R.id.title);
  48. android.widget.RelativeLayout.LayoutParams tvp = new android.widget.RelativeLayout.LayoutParams(
  49. RelativeLayout.LayoutParams.WRAP_CONTENT,
  50. RelativeLayout.LayoutParams.WRAP_CONTENT);
  51. tvp.addRule(RelativeLayout.ALIGN_PARENT_TOP);
  52. tvp.addRule(RelativeLayout.CENTER_HORIZONTAL);
  53. tv.setLayoutParams(tvp);
  55. ImageView iv = (ImageView) tabWidget.getChildAt(i).findViewById(
  56. android.R.id.icon);
  57. android.widget.RelativeLayout.LayoutParams ivp = new android.widget.RelativeLayout.LayoutParams(
  58. RelativeLayout.LayoutParams.WRAP_CONTENT,
  59. RelativeLayout.LayoutParams.WRAP_CONTENT);
  60. ivp.addRule(RelativeLayout.CENTER_HORIZONTAL);
  61. ivp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
  62. iv.setLayoutParams(ivp);
  64. // 得到每个tab
  65. View vvv = tabWidget.getChildAt(i);
  66. // 设置背景色为透明
  67. vvv.setBackgroundColor(Color.TRANSPARENT);
  68. // 设置字体颜色和大小
  69. tv.setTextColor(this.getResources()
  70. .getColorStateList(R.color.white));
  71. tv.setTextSize(15);
  73. }
  74. }
  76. private void setupChild2() {
  77. Intent intent = new Intent();
  78. intent.setAction(Intent.ACTION_MAIN);
  79. intent.setClass(this, AnotherChildActivity.class);
  80. String name = (String) this.getResources().getText(R.string.allimage);
  81. tabHost.addTab(tabHost
  82. .newTabSpec(name)
  83. .setIndicator(name,
  84. getResources().getDrawable(R.drawable.tab_selected))
  85. .setContent(intent));
  86. }
  88. private void setupChild1() {
  89. Intent intent = new Intent();
  90. intent.setAction(Intent.ACTION_MAIN);
  91. intent.setClass(this, ChildTabHostActivity.class);
  92. String name = (String) this.getResources().getText(R.string.onepiece);
  93. tabHost.addTab(tabHost
  94. .newTabSpec(name)
  95. .setIndicator(name,
  96. getResources().getDrawable(R.drawable.tab_selected))
  97. .setContent(intent));
  98. }
  99. }

2、未带混淆机制的MainTabHostActivity代码 【成都安卓培训】

[java] view plaincopyprint?
    ,
  1. package com.yang.tabhost;
  3. import android.app.TabActivity;
  4. import android.content.Intent;
  5. import android.content.res.Resources;
  6. import android.os.Bundle;
  7. import android.view.View;
  8. import android.widget.ImageView;
  9. import android.widget.RelativeLayout.LayoutParams;
  10. import android.widget.TabHost;
  11. import android.widget.TabHost.TabSpec;
  12. import android.widget.TabWidget;
  13. import android.widget.TextView;
  15. public class MainTabHostActivity extends TabActivity
  16. {
  17. private TabHost tabHost;
  18. private TabWidget tabWidget;
  20. private void makeTab()
  21. {
  22. if (this.tabHost == null)
  23. {
  24. this.tabHost = getTabHost();
  25. this.tabWidget = getTabWidget();
  26. this.tabHost.setup();
  27. this.tabHost.bringToFront();
  28. setupChild1();
  29. setupChild2();
  30. }
  31. for (int i = 0; ; i++)
  32. {
  33. if (i >= this.tabWidget.getChildCount())
  34. return;
  35. TextView localTextView = (TextView)this.tabWidget.getChildAt(i).findViewById(16908310);
  36. RelativeLayout.LayoutParams localLayoutParams1 = new RelativeLayout.LayoutParams(-2, -2);
  37. localLayoutParams1.addRule(10);
  38. localLayoutParams1.addRule(14);
  39. localTextView.setLayoutParams(localLayoutParams1);
  40. ImageView localImageView = (ImageView)this.tabWidget.getChildAt(i).findViewById(16908294);
  41. RelativeLayout.LayoutParams localLayoutParams2 = new RelativeLayout.LayoutParams(-2, -2);
  42. localLayoutParams2.addRule(14);
  43. localLayoutParams2.addRule(12);
  44. localImageView.setLayoutParams(localLayoutParams2);
  45. this.tabWidget.getChildAt(i).setBackgroundColor(0);
  46. localTextView.setTextColor(getResources().getColorStateList(2130968578));
  47. localTextView.setTextSize(15.0F);
  48. }
  49. }
  51. private void setupChild1()
  52. {
  53. Intent localIntent = new Intent();
  54. localIntent.setAction("android.intent.action.MAIN");
  55. localIntent.setClass(this, ChildTabHostActivity.class);
  56. String str = (String)getResources().getText(2131034113);
  57. this.tabHost.addTab(this.tabHost.newTabSpec(str).setIndicator(str, getResources().getDrawable(2130837512)).setContent(localIntent));
  58. }
  60. private void setupChild2()
  61. {
  62. Intent localIntent = new Intent();
  63. localIntent.setAction("android.intent.action.MAIN");
  64. localIntent.setClass(this, AnotherChildActivity.class);
  65. String str = (String)getResources().getText(2131034114);
  66. this.tabHost.addTab(this.tabHost.newTabSpec(str).setIndicator(str, getResources().getDrawable(2130837512)).setContent(localIntent));
  67. }
  69. protected void onCreate(Bundle paramBundle)
  70. {
  71. super.onCreate(paramBundle);
  72. requestWindowFeature(1);
  73. requestWindowFeature(2);
  74. setContentView(2130903041);
  75. makeTab();
  76. }
  77. }
3、混淆后的MainTabHostActivity代码
[java] view plaincopyprint?
  1. package com.yang.tabhost;
  3. import android.app.TabActivity;
  4. import android.content.Intent;
  5. import android.content.res.Resources;
  6. import android.os.Bundle;
  7. import android.view.View;
  8. import android.widget.ImageView;
  9. import android.widget.RelativeLayout.LayoutParams;
  10. import android.widget.TabHost;
  11. import android.widget.TabHost.TabSpec;
  12. import android.widget.TabWidget;
  13. import android.widget.TextView;
  15. public class MainTabHostActivity extends TabActivity
  16. {
  17. private TabHost a;
  18. private TabWidget b;
  20. protected void onCreate(Bundle paramBundle)
  21. {
  22. super.onCreate(paramBundle);
  23. requestWindowFeature(1);
  24. requestWindowFeature(2);
  25. setContentView(2130903041);
  26. if (this.a == null)
  27. {
  28. this.a = getTabHost();
  29. this.b = getTabWidget();
  30. this.a.setup();
  31. this.a.bringToFront();
  32. Intent localIntent1 = new Intent();
  33. localIntent1.setAction("android.intent.action.MAIN");
  34. localIntent1.setClass(this, ChildTabHostActivity.class);
  35. String str1 = (String)getResources().getText(2131034113);
  36. this.a.addTab(this.a.newTabSpec(str1).setIndicator(str1, getResources().getDrawable(2130837512)).setContent(localIntent1));
  37. Intent localIntent2 = new Intent();
  38. localIntent2.setAction("android.intent.action.MAIN");
  39. localIntent2.setClass(this, AnotherChildActivity.class);
  40. String str2 = (String)getResources().getText(2131034114);
  41. this.a.addTab(this.a.newTabSpec(str2).setIndicator(str2, getResources().getDrawable(2130837512)).setContent(localIntent2));
  42. }
  43. for (int i = 0; ; i++)
  44. {
  45. if (i >= this.b.getChildCount())
  46. return;
  47. TextView localTextView = (TextView)this.b.getChildAt(i).findViewById(16908310);
  48. RelativeLayout.LayoutParams localLayoutParams1 = new RelativeLayout.LayoutParams(-2, -2);
  49. localLayoutParams1.addRule(10);
  50. localLayoutParams1.addRule(14);
  51. localTextView.setLayoutParams(localLayoutParams1);
  52. ImageView localImageView = (ImageView)this.b.getChildAt(i).findViewById(16908294);
  53. RelativeLayout.LayoutParams localLayoutParams2 = new RelativeLayout.LayoutParams(-2, -2);
  54. localLayoutParams2.addRule(14);
  55. localLayoutParams2.addRule(12);
  56. localImageView.setLayoutParams(localLayoutParams2);
  57. this.b.getChildAt(i).setBackgroundColor(0);
  58. localTextView.setTextColor(getResources().getColorStateList(2130968578));
  59. localTextView.setTextSize(15.0F);
  60. }
  61. }
  62. }

从中可以看出，混淆后的代码难以阅读，但是可以从中找到规律，至于什么规律，博主能力有限，看大家去找了……
 


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原文地址：https://www.cnblogs.com/jackrex/p/3001266.html