Android应用很多时候都会涉及到网络，在请求网络出错时，我们可以通过抓包来分析网络请求，返回的数据等，通常我们是用tcpdump这个工具来抓包，再通过wireshark工具来分析生成的文件，关于tcpdump的使，可以从网上查一下，有很多介绍，比如：http://www.cnblogs.com/likwo/archive/2012/09/06/2673944.html。关于如何用wireshark来分析文件，本文不作介绍。

使用adb的命令来操作，还是比较麻烦，所以我写了一个应用，把这些命令封装了起来。实现的最根本的原理是通过Runtime.exec来执行linux命令。
实现代码
CommandsHelper.java

1. /**
   
2. *
   
3. * @author lihong06
   
4. * @since 2014-3-3
   
5. */
   
6. public class CommandsHelper {
   
7. private static final String NAME = "<a title="tcpdump" href="http://www.android-study.com/wangluobiancheng/570.html">tcpdump</a>";
   
8. private static final String TAG = "CommandsHelper";
   
9. public static final String DEST_FILE = Environment.getExternalStorageDirectory() + "/capture.pcap";
   
10. 
    
11. public static boolean startCapture(Context context) {
    
12. InputStream is = null;
    
13. OutputStream os = null;
    
14. boolean retVal = false;
    
15. try {
    
16. AssetManager am = context.getAssets();
    
17. is = am.open(NAME);
    
18. File sdcardFile = Environment.getExternalStorageDirectory();
    
19. File dstFile = new File(sdcardFile, NAME);
    
20. os = new FileOutputStream(dstFile);
    
21. 
    
22. copyStream(is, os);
    
23. 
    
24. String[] commands = new String[7];
    
25. commands[0] = "adb shell";
    
26. commands[1] = "su";
    
27. commands[2] = "cp -rf " + dstFile.toString() + " /data/local/<a title="tcpdump" href="http://www.android-study.com/wangluobiancheng/570.html">tcpdump</a>";
    
28. commands[3] = "rm -r " + dstFile.toString();
    
29. commands[4] = "chmod 777 /data/local/<a title="tcpdump" href="http://www.android-study.com/wangluobiancheng/570.html">tcpdump</a>";
    
30. commands[5] = "cd /data/local";
    
31. commands[6] = "<a title="tcpdump" href="http://www.android-study.com/wangluobiancheng/570.html">tcpdump</a> -p -vv -s 0 -w " + DEST_FILE;
    
32. 
    
33. execCmd(commands);
    
34. } catch (IOException e) {
    
35. e.printStackTrace();
    
36. Log.i(TAG, " error: " + e.getMessage());
    
37. } finally {
    
38. closeSafely(is);
    
39. closeSafely(os);
    
40. }
    
41. 
    
42. return retVal;
    
43. }
    
44. 
    
45. public static void stopCapture(Context context) {
    
46. // 找出所有的带有<a title="tcpdump" href="http://www.android-study.com/wangluobiancheng/570.html">tcpdump</a>的进程
    
47. String[] commands = new String[2];
    
48. commands[0] = "adb shell";
    
49. commands[1] = "ps|grep <a title="tcpdump" href="http://www.android-study.com/wangluobiancheng/570.html">tcpdump</a>|grep root|awk '{print $2}'";
    
50. Process process = execCmd(commands);
    
51. String result = parseInputStream(process.getInputStream());
    
52. if (!TextUtils.isEmpty(result)) {
    
53. String[] pids = result.split("\n");
    
54. if (null != pids) {
    
55. String[] killCmds = new String[pids.length];
    
56. for (int i = 0; i < pids.length; ++i) {
    
57. killCmds[i] = "kill -9 " + pids[i];
    
58. }
    
59. execCmd(killCmds);
    
60. }
    
61. }
    
62. }
    
63. 
    
64. public static Process execCmd(String command) {
    
65. return execCmd(new String[] { command }, true);
    
66. }
    
67. 
    
68. public static Process execCmd(String[] commands) {
    
69. return execCmd(commands, true);
    
70. }
    
71. 
    
72. public static Process execCmd(String[] commands, boolean waitFor) {
    
73. Process suProcess = null;
    
74. try {
    
75. suProcess = Runtime.getRuntime().exec("su");
    
76. DataOutputStream os = new DataOutputStream(suProcess.getOutputStream());
    
77. for (String cmd : commands) {
    
78. if (!TextUtils.isEmpty(cmd)) {
    
79. os.writeBytes(cmd + "\n");
    
80. }
    
81. }
    
82. os.flush();
    
83. os.writeBytes("exit\n");
    
84. os.flush();
    
85. } catch (IOException e) {
    
86. e.printStackTrace();
    
87. }
    
88. 
    
89. if (waitFor) {
    
90. boolean retval = false;
    
91. try {
    
92. int suProcessRetval = suProcess.waitFor();
    
93. if (255 != suProcessRetval) {
    
94. retval = true;
    
95. } else {
    
96. retval = false;
    
97. }
    
98. } catch (Exception ex) {
    
99. Log.w("Error ejecutando el comando Root", ex);
    
100. }
     
101. }
     
102. 
     
103. return suProcess;
     
104. }
     
105. 
     
106. private static void copyStream(InputStream is, OutputStream os) {
     
107. final int BUFFER_SIZE = 1024;
     
108. try {
     
109. byte[] bytes = new byte[BUFFER_SIZE];
     
110. for (;;) {
     
111. int count = is.read(bytes, 0, BUFFER_SIZE);
     
112. if (count == -1) {
     
113. break;
     
114. }
     
115. 
     
116. os.write(bytes, 0, count);
     
117. }
     
118. } catch (IOException e) {
     
119. e.printStackTrace();
     
120. }
     
121. }
     
122. 
     
123. private static void closeSafely(Closeable is) {
     
124. try {
     
125. if (null != is) {
     
126. is.close();
     
127. }
     
128. } catch (IOException e) {
     
129. e.printStackTrace();
     
130. }
     
131. }
     
132. 
     
133. private static String parseInputStream(InputStream is) {
     
134. InputStreamReader isr = new InputStreamReader(is);
     
135. BufferedReader br = new BufferedReader(isr);
     
136. String line = null;
     
137. StringBuilder sb = new StringBuilder();
     
138. try {
     
139. while ( (line = br.readLine()) != null) {
     
140. sb.append(line).append("\n");
     
141. }
     
142. } catch (IOException e) {
     
143. e.printStackTrace();
     
144. }
     
145. 
     
146. return sb.toString();
     
147. }
     
148. }

复制代码

MainActivity.java

1. public class MainActivity extends Activity {
   
2. @Override
   
3. protected void onCreate(Bundle savedInstanceState) {
   
4. super.onCreate(savedInstanceState);
   
5. setContentView(R.layout.activity_main);
   
6. 
   
7. final TextView textView = (TextView) findViewById(R.id.textView1);
   
8. String oldText = textView.getText().toString();
   
9. textView.setText(oldText + "\n\n" + "目标文件： " + CommandsHelper.DEST_FILE);
   
10. 
    
11. findViewById(R.id.start_capture).setOnClickListener(new View.OnClickListener() {
    
12. @Override
    
13. public void onClick(View v) {
    
14. v.setEnabled(false);
    
15. new Thread(new Runnable() {
    
16. @Override
    
17. public void run() {
    
18. final boolean retVal = CommandsHelper.startCapture(MainActivity.this);
    
19. runOnUiThread(new Runnable() {
    
20. @Override
    
21. public void run() {
    
22. Toast.makeText(MainActivity.this, "startCapture result = " + retVal, Toast.LENGTH_SHORT).show();
    
23. }
    
24. });
    
25. }
    
26. }).start();
    
27. }
    
28. });
    
29. 
    
30. findViewById(R.id.stop_capture).setOnClickListener(new View.OnClickListener() {
    
31. @Override
    
32. public void onClick(View v) {
    
33. CommandsHelper.stopCapture(MainActivity.this);
    
34. findViewById(R.id.start_capture).setEnabled(true);
    
35. }
    
36. });
    
37. }
    
38. 
    
39. @Override
    
40. public boolean onCreateOptionsMenu(Menu menu) {
    
41. // Inflate the menu; this adds items to the action bar if it is present.
    
42. getMenuInflater().inflate(R.menu.main, menu);
    
43. return true;
    
44. }
    
45. }

复制代码

说明
1、手机必须要Root，没有root的我没有测试过，另外，我也只测试了我一台手机，没有覆盖到所有的手机。
2、大家如果发现问题，请告知于我，谢谢。

Android应用很多时候都会涉及到网络，在请求网络出错时，我们可以通过抓包来分析网络请求，返回的数据等，通常我们是用tcpdump这个工具来抓包，再通过wireshark工具来分析生成的文件，关于tcpdump的使，可以从网上查一下，有很多介绍，比如：http://www.cnblogs.com/likwo/archive/2012/09/06/2673944.html。关于如何用wireshark来分析文件，本文不作介绍。

使用adb的命令来操作，还是比较麻烦，所以我写了一个应用，把这些命令封装了起来。实现的最根本的原理是通过Runtime.exec来执行linux命令。
实现代码
CommandsHelper.java

1. /**
   
2. *
   
3. * @author lihong06
   
4. * @since 2014-3-3
   
5. */
   
6. public class CommandsHelper {
   
7. private static final String NAME = "<a title="tcpdump" href="http://www.android-study.com/wangluobiancheng/570.html">tcpdump</a>";
   
8. private static final String TAG = "CommandsHelper";
   
9. public static final String DEST_FILE = Environment.getExternalStorageDirectory() + "/capture.pcap";
   
10. 
    
11. public static boolean startCapture(Context context) {
    
12. InputStream is = null;
    
13. OutputStream os = null;
    
14. boolean retVal = false;
    
15. try {
    
16. AssetManager am = context.getAssets();
    
17. is = am.open(NAME);
    
18. File sdcardFile = Environment.getExternalStorageDirectory();
    
19. File dstFile = new File(sdcardFile, NAME);
    
20. os = new FileOutputStream(dstFile);
    
21. 
    
22. copyStream(is, os);
    
23. 
    
24. String[] commands = new String[7];
    
25. commands[0] = "adb shell";
    
26. commands[1] = "su";
    
27. commands[2] = "cp -rf " + dstFile.toString() + " /data/local/<a title="tcpdump" href="http://www.android-study.com/wangluobiancheng/570.html">tcpdump</a>";
    
28. commands[3] = "rm -r " + dstFile.toString();
    
29. commands[4] = "chmod 777 /data/local/<a title="tcpdump" href="http://www.android-study.com/wangluobiancheng/570.html">tcpdump</a>";
    
30. commands[5] = "cd /data/local";
    
31. commands[6] = "<a title="tcpdump" href="http://www.android-study.com/wangluobiancheng/570.html">tcpdump</a> -p -vv -s 0 -w " + DEST_FILE;
    
32. 
    
33. execCmd(commands);
    
34. } catch (IOException e) {
    
35. e.printStackTrace();
    
36. Log.i(TAG, " error: " + e.getMessage());
    
37. } finally {
    
38. closeSafely(is);
    
39. closeSafely(os);
    
40. }
    
41. 
    
42. return retVal;
    
43. }
    
44. 
    
45. public static void stopCapture(Context context) {
    
46. // 找出所有的带有<a title="tcpdump" href="http://www.android-study.com/wangluobiancheng/570.html">tcpdump</a>的进程
    
47. String[] commands = new String[2];
    
48. commands[0] = "adb shell";
    
49. commands[1] = "ps|grep <a title="tcpdump" href="http://www.android-study.com/wangluobiancheng/570.html">tcpdump</a>|grep root|awk '{print $2}'";
    
50. Process process = execCmd(commands);
    
51. String result = parseInputStream(process.getInputStream());
    
52. if (!TextUtils.isEmpty(result)) {
    
53. String[] pids = result.split("\n");
    
54. if (null != pids) {
    
55. String[] killCmds = new String[pids.length];
    
56. for (int i = 0; i < pids.length; ++i) {
    
57. killCmds[i] = "kill -9 " + pids[i];
    
58. }
    
59. execCmd(killCmds);
    
60. }
    
61. }
    
62. }
    
63. 
    
64. public static Process execCmd(String command) {
    
65. return execCmd(new String[] { command }, true);
    
66. }
    
67. 
    
68. public static Process execCmd(String[] commands) {
    
69. return execCmd(commands, true);
    
70. }
    
71. 
    
72. public static Process execCmd(String[] commands, boolean waitFor) {
    
73. Process suProcess = null;
    
74. try {
    
75. suProcess = Runtime.getRuntime().exec("su");
    
76. DataOutputStream os = new DataOutputStream(suProcess.getOutputStream());
    
77. for (String cmd : commands) {
    
78. if (!TextUtils.isEmpty(cmd)) {
    
79. os.writeBytes(cmd + "\n");
    
80. }
    
81. }
    
82. os.flush();
    
83. os.writeBytes("exit\n");
    
84. os.flush();
    
85. } catch (IOException e) {
    
86. e.printStackTrace();
    
87. }
    
88. 
    
89. if (waitFor) {
    
90. boolean retval = false;
    
91. try {
    
92. int suProcessRetval = suProcess.waitFor();
    
93. if (255 != suProcessRetval) {
    
94. retval = true;
    
95. } else {
    
96. retval = false;
    
97. }
    
98. } catch (Exception ex) {
    
99. Log.w("Error ejecutando el comando Root", ex);
    
100. }
     
101. }
     
102. 
     
103. return suProcess;
     
104. }
     
105. 
     
106. private static void copyStream(InputStream is, OutputStream os) {
     
107. final int BUFFER_SIZE = 1024;
     
108. try {
     
109. byte[] bytes = new byte[BUFFER_SIZE];
     
110. for (;;) {
     
111. int count = is.read(bytes, 0, BUFFER_SIZE);
     
112. if (count == -1) {
     
113. break;
     
114. }
     
115. 
     
116. os.write(bytes, 0, count);
     
117. }
     
118. } catch (IOException e) {
     
119. e.printStackTrace();
     
120. }
     
121. }
     
122. 
     
123. private static void closeSafely(Closeable is) {
     
124. try {
     
125. if (null != is) {
     
126. is.close();
     
127. }
     
128. } catch (IOException e) {
     
129. e.printStackTrace();
     
130. }
     
131. }
     
132. 
     
133. private static String parseInputStream(InputStream is) {
     
134. InputStreamReader isr = new InputStreamReader(is);
     
135. BufferedReader br = new BufferedReader(isr);
     
136. String line = null;
     
137. StringBuilder sb = new StringBuilder();
     
138. try {
     
139. while ( (line = br.readLine()) != null) {
     
140. sb.append(line).append("\n");
     
141. }
     
142. } catch (IOException e) {
     
143. e.printStackTrace();
     
144. }
     
145. 
     
146. return sb.toString();
     
147. }
     
148. }

复制代码

MainActivity.java

1. public class MainActivity extends Activity {
   
2. @Override
   
3. protected void onCreate(Bundle savedInstanceState) {
   
4. super.onCreate(savedInstanceState);
   
5. setContentView(R.layout.activity_main);
   
6. 
   
7. final TextView textView = (TextView) findViewById(R.id.textView1);
   
8. String oldText = textView.getText().toString();
   
9. textView.setText(oldText + "\n\n" + "目标文件： " + CommandsHelper.DEST_FILE);
   
10. 
    
11. findViewById(R.id.start_capture).setOnClickListener(new View.OnClickListener() {
    
12. @Override
    
13. public void onClick(View v) {
    
14. v.setEnabled(false);
    
15. new Thread(new Runnable() {
    
16. @Override
    
17. public void run() {
    
18. final boolean retVal = CommandsHelper.startCapture(MainActivity.this);
    
19. runOnUiThread(new Runnable() {
    
20. @Override
    
21. public void run() {
    
22. Toast.makeText(MainActivity.this, "startCapture result = " + retVal, Toast.LENGTH_SHORT).show();
    
23. }
    
24. });
    
25. }
    
26. }).start();
    
27. }
    
28. });
    
29. 
    
30. findViewById(R.id.stop_capture).setOnClickListener(new View.OnClickListener() {
    
31. @Override
    
32. public void onClick(View v) {
    
33. CommandsHelper.stopCapture(MainActivity.this);
    
34. findViewById(R.id.start_capture).setEnabled(true);
    
35. }
    
36. });
    
37. }
    
38. 
    
39. @Override
    
40. public boolean onCreateOptionsMenu(Menu menu) {
    
41. // Inflate the menu; this adds items to the action bar if it is present.
    
42. getMenuInflater().inflate(R.menu.main, menu);
    
43. return true;
    
44. }
    
45. }

复制代码

说明
1、手机必须要Root，没有root的我没有测试过，另外，我也只测试了我一台手机，没有覆盖到所有的手机。
2、大家如果发现问题，请告知于我，谢谢。