blocks|key|1243976|text|编辑：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1243977|内部日志是内存中的循环缓冲区。实际上有几个这样的循环缓冲区，分别对应于:+radio、events、main。默认值为main。|1243978|为了获得缓冲区的副本，一种技术涉及在设备上执行命令并获得作为字符串变量的输出。|1243979|http://www.l6n.org/android/sendlog.shtml是一个开源的应用程序，它可以做到这一点：|offset|length|1243980|关键是要在嵌入式操作系统下在设备上运行logcat。这并不像听起来那么难，只需查看链接中的开源应用程序即可。|style|CODE|1243981|entityMap|0|LINK|mutability|MUTABLE|url|http://www.l6n.org/android/sendlog.shtml^0|0|0|0|0|14|0|0|J|6|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@$H|Z|I|10|1|11]]|A|$]]|$1|J|3|K|5|6|7|12|8|@$H|13|I|14|L|M]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]]]

EDIT: 

The internal log is a circular buffer in memory. There are actually a few such circular buffers for each of: radio, events, main. The default is main.

To obtain a copy of a buffer, one technique involves executing a command on the device and obtaining the output as a string variable.

SendLog is an open source App which does just this: <a href="http://www.l6n.org/android/sendlog.shtml" rel="noreferrer">http://www.l6n.org/android/sendlog.shtml</a>

The key is to run <code>logcat</code> on the device in the embedded OS. It's not as hard as it sounds, just check out the open source app in the link.

blocks|key|1244019|text|我经常收到错误消息"logcat+read:+Invalid+argument“。在从日志中读取之前，我必须清除日志。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1244020|我喜欢这样：|1244021|prompt>+cd+~/Desktop
prompt>+adb+logcat+-c
prompt>+adb+logcat+%7C+tee+log.txt|code-block|syntax|javascript|1244022|entityMap^0|A|T|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Often I get the error "<code>logcat read: Invalid argument</code>". I had to clear the log, before reading from the log.

I do like this:

<pre><code>prompt&gt; cd ~/Desktop
prompt&gt; adb logcat -c
prompt&gt; adb logcat | tee log.txt
</code></pre>

blocks|key|1244046|text|我会使用这样的东西：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1244047|$adb+logcat+-d+>+logcat.txt|code-block|syntax|javascript|1244048|-d选项将整个循环缓冲区转储到文本文件中，如果您正在查找特定的操作/意图，请尝试|1244049|$adb+logcat+-d+%7C+grep+'com.whatever.you.are.looking.for'+-B+100+-A+100+>+shorterlog.txt|1244050|希望这能有所帮助:)|1244051|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I would use something of this sort :

<pre><code>$adb logcat -d &gt; logcat.txt
</code></pre>

The -d option dumps the entire circular buffer into the text file and if you are looking for a particular action/intent try

<pre><code>$adb logcat -d | grep 'com.whatever.you.are.looking.for' -B 100 -A 100 &gt; shorterlog.txt
</code></pre>

Hope this helps :)

blocks|key|1029170|text|我希望这段代码能帮助到一些人。我花了两天时间弄清楚如何从设备上登录，然后过滤它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1029171|public+File+extractLogToFileAndWeb(){
++++++++//set+a+file
++++++++Date+datum+=+new+Date();
++++++++SimpleDateFormat+df+=+new+SimpleDateFormat("yyyy-MM-dd",+Locale.ITALY);
++++++++String+fullName+=+df.format(datum)%2B"appLog.log";
++++++++File+file+=+new+File+(Environment.getExternalStorageDirectory(),+fullName);

++++++++//clears+a+file
++++++++if(file.exists()){
++++++++++++file.delete();
++++++++}


++++++++//write+log+to+file
++++++++int+pid+=+android.os.Process.myPid();
++++++++try+{
++++++++++++String+command+=+String.format("logcat+-d+-v+threadtime+*:*");++++++++
++++++++++++Process+process+=+Runtime.getRuntime().exec(command);

++++++++++++BufferedReader+reader+=+new+BufferedReader(new+InputStreamReader(process.getInputStream()));
++++++++++++StringBuilder+result+=+new+StringBuilder();
++++++++++++String+currentLine+=+null;

++++++++++++while+((currentLine+=+reader.readLine())+!=+null)+{
+++++++++++++++++++if+(currentLine+!=+null+&&+currentLine.contains(String.valueOf(pid)))+{
+++++++++++++++++++++++result.append(currentLine);
+++++++++++++++++++++++result.append("\n");
++++++++++++++++++++}
++++++++++++}

++++++++++++FileWriter+out+=+new+FileWriter(file);
++++++++++++out.write(result.toString());
++++++++++++out.close();

++++++++++++//Runtime.getRuntime().exec("logcat+-d+-v+time+-f+"%2Bfile.getAbsolutePath());
++++++++}+catch+(IOException+e)+{
++++++++++++Toast.makeText(getApplicationContext(),+e.toString(),+Toast.LENGTH_SHORT).show();
++++++++}


++++++++//clear+the+log
++++++++try+{
++++++++++++Runtime.getRuntime().exec("logcat+-c");
++++++++}+catch+(IOException+e)+{
++++++++++++Toast.makeText(getApplicationContext(),+e.toString(),+Toast.LENGTH_SHORT).show();
++++++++}

++++++++return+file;
++++}|code-block|syntax|javascript|1029172|正如@mehdok所指出的|1029173|向清单添加读取日志的权限|1029174|<uses-permission+android:name="android.permission.READ_LOGS"+/>|1029175|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I hope this code will help someone. It took me 2 days to figure out how to log from device, and then filter it:

<pre><code>public File extractLogToFileAndWeb(){
 //set a file
 Date datum = new Date();
 SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd", Locale.ITALY);
 String fullName = df.format(datum)+"appLog.log";
 File file = new File (Environment.getExternalStorageDirectory(), fullName);

 //clears a file
 if(file.exists()){
 file.delete();
 }


 //write log to file
 int pid = android.os.Process.myPid();
 try {
 String command = String.format("logcat -d -v threadtime *:*"); 
 Process process = Runtime.getRuntime().exec(command);

 BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
 StringBuilder result = new StringBuilder();
 String currentLine = null;

 while ((currentLine = reader.readLine()) != null) {
 if (currentLine != null &amp;&amp; currentLine.contains(String.valueOf(pid))) {
 result.append(currentLine);
 result.append("\n");
 }
 }

 FileWriter out = new FileWriter(file);
 out.write(result.toString());
 out.close();

 //Runtime.getRuntime().exec("logcat -d -v time -f "+file.getAbsolutePath());
 } catch (IOException e) {
 Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show();
 }


 //clear the log
 try {
 Runtime.getRuntime().exec("logcat -c");
 } catch (IOException e) {
 Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show();
 }

 return file;
 }
</code></pre>

as pointed by @mehdok

add the permission to the manifest for reading logs

<pre><code>&lt;uses-permission android:name="android.permission.READ_LOGS" /&gt;
</code></pre>

blocks|key|1029216|text|多亏了user1354692，我可以让它变得更简单，只需要一行代码！他评论的那个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1029217|try+{
++++File+file+=+new+File(Environment.getExternalStorageDirectory(),+String.valueOf(System.currentTimeMillis()));
++++Runtime.getRuntime().exec("logcat+-d+-v+time+-f+"+%2B+file.getAbsolutePath());}catch+(IOException+e){}|code-block|syntax|javascript|1029218|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Thanks to user1354692 I could made it more easy, with only one line! the one he has commented:

<pre><code>try {
 File file = new File(Environment.getExternalStorageDirectory(), String.valueOf(System.currentTimeMillis()));
 Runtime.getRuntime().exec("logcat -d -v time -f " + file.getAbsolutePath());}catch (IOException e){}
</code></pre>

blocks|key|1029300|text|首先通过设置android+sdk+platform-tools的路径，确保adb命令可执行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1029301|export+PATH=/Users/espireinfolabs/Desktop/soft/android-sdk-mac_x86/platform-tools:$PATH|code-block|syntax|javascript|1029302|然后运行：|1029303|adb+shell+logcat+>+log.txt|1029304|或者首先移动到adb平台-工具：|1029305|cd+/Users/user/Android/Tools/android-sdk-macosx/platform-tools+|1029306|然后运行|1029307|./adb+shell+logcat+>+log.txt|1029308|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

First make sure adb command is executable by setting PATH to android sdk platform-tools:

<pre><code>export PATH=/Users/espireinfolabs/Desktop/soft/android-sdk-mac_x86/platform-tools:$PATH
</code></pre>

then run:

<pre><code>adb shell logcat &gt; log.txt
</code></pre>

OR first move to adb platform-tools:

<pre><code>cd /Users/user/Android/Tools/android-sdk-macosx/platform-tools 
</code></pre>

then run

<pre><code>./adb shell logcat &gt; log.txt
</code></pre>

blocks|key|1029336|text|我已经创建了一个小型库(.aar)来通过电子邮件检索日志。你可以在Gmail账户中使用它。它很简单，但很有效。你可以得到一个副本的from+here|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1029337|该网站是西班牙语的，但有一个英文版本的产品说明的PDF。|1029338|我希望它能有所帮助。|1029339|entityMap|0|LINK|mutability|MUTABLE|url|http://androideprofesional.blogspot.ie/^0|1T|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

I have created a small library (.aar) to retrieve the logs by email. You can use it with Gmail accounts. It is pretty simple but works. You can get a copy <a href="http://androideprofesional.blogspot.ie/" rel="nofollow">from here</a>

The site is in Spanish, but there is a PDF with an english version of the product description.

I hope it can help.

blocks|key|1244319|text|只需运行以下命令即可将输出发送到您的终端：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1244320|adb+shell+logcat|code-block|syntax|javascript|1244321|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Simple just run the following command to get the output to your terminal:

<pre><code>adb shell logcat
</code></pre>

blocks|key|1029427|text|对于那些对USB调试或使用adb不感兴趣的人，有一个更简单的解决方案。在Android+6(不确定之前的版本)中，开发者工具下有一个选项:+Take+Bug+Report|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1029428|单击此选项将准备一份错误报告，并提示您将其保存到驱动器或通过电子邮件发送。|1029429|我发现这是获取日志的最简单方法。我不喜欢打开USB调试。|1029430|entityMap^0|D|3|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|P|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|K|$]]

For those not interested in USB debugging or using <code>adb</code> there is an easier solution. In Android 6 (Not sure about prior version) there is an option under developer tools: Take Bug Report

Clicking this option will prepare a bug report and prompt you to save it to drive or have it sent in email.

I found this to be the easiest way to get logs. I don't like to turn on USB debugging.

I would like to pull the log file from a device to my PC. How can I do that?

问如何从Android设备获取日志文件？
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