• 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
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