blocks|key|1186395|text|使用logcat+-f+<filename>将其转储到文件系统中的一个文件中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1186396|确保您使用的文件名在SD卡中，即以/sdcard/...开头。|1186397|此外，为了将参数传递给logcat程序，您应该向exec方法传递一个字符串数组(而不是一个字符串)：|1186398|String[]+cmd+=+new+String[]+{+"logcat",+"-f",+"/sdcard/myfilename",+"-v",+"time",+"ActivityManager:W",+"myapp:D"+};|code-block|syntax|javascript|1186399|最后，如果所有其他方法都失败了，请使用logcat：/system/bin/logcat的完整路径，而不只是logcat。|1186400|entityMap^0|2|K|0|H|B|0|B|6|O|4|0|0|Q|I|1I|6|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|13|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|R|$]]

use <code>logcat -f &lt;filename&gt;</code> in order to dump it to a file in the filesystem. 
Make sure the filename you're using is in the sdcard, i.e. starts with <code>/sdcard/...</code>.

Also, in order to pass arguments to the <code>logcat</code> program, you should pass the <code>exec</code> method an array of strings (and not one string):

<pre><code>String[] cmd = new String[] { "logcat", "-f", "/sdcard/myfilename", "-v", "time", "ActivityManager:W", "myapp:D" };
</code></pre>

Finally, if all else fails, use the full path for logcat: <code>/system/bin/logcat</code> instead of just <code>logcat</code>.

blocks|key|1186428|text|尝试在字符串中的每个元素后使用空格。否则，它将被视为不带空格的单行命令，并且不执行任何操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1186429|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Try using a space after every element in the string. Otherwise, it will consider as a single line command without spaces and do nothing.

blocks|key|972192|text|这是我的工作版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|972193|try+{
++++File+filename+=+new+File(Environment.getExternalStorageDirectory()%2B"/logfile.log");+
++++filename.createNewFile();+
++++String+cmd+=+"logcat+-d+-f+"%2Bfilename.getAbsolutePath();
++++Runtime.getRuntime().exec(cmd);
}+catch+(IOException+e)+{
++++//+TODO+Auto-generated+catch+block
++++e.printStackTrace();
}|code-block|syntax|javascript|972194|找到日志文件/sdcard/logfile.log|972195|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This is my worked version:

<pre><code>try {
 File filename = new File(Environment.getExternalStorageDirectory()+"/logfile.log"); 
 filename.createNewFile(); 
 String cmd = "logcat -d -f "+filename.getAbsolutePath();
 Runtime.getRuntime().exec(cmd);
} catch (IOException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
}
</code></pre>

find your logfile /sdcard/logfile.log

blocks|key|972202|text|+++/**
+++++*+Launches+a+logcat+process.
+++++*+To+stop+the+logcat+preserve+the+use:
+++++*+process.destroy();
+++++*+in+the+onBackPressed()
+++++*
+++++*+@param+filename+destination+of+logcat+output
+++++*+@return+Process+logcaat+is+running+on
+++++*/

++++public+Process+launchLogcat(String+filename)+{
++++++++Process+process+=+null;
++++++++String+cmd+=+"logcat+-f+"+%2B+filename+%2B+"\n";
++++++++try+{
++++++++++++process+=+Runtime.getRuntime().exec(cmd);
++++++++}+catch+(IOException+e)+{
++++++++++++process+=+null;
++++++++}
++++++++return+process;
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|972203|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> /**
 * Launches a logcat process.
 * To stop the logcat preserve the use:
 * process.destroy();
 * in the onBackPressed()
 *
 * @param filename destination of logcat output
 * @return Process logcaat is running on
 */

 public Process launchLogcat(String filename) {
 Process process = null;
 String cmd = "logcat -f " + filename + "\n";
 try {
 process = Runtime.getRuntime().exec(cmd);
 } catch (IOException e) {
 process = null;
 }
 return process;
 }
</code></pre>

blocks|key|1186508|text|如果日志文件为空，请尝试将文件扩展名从.log更改为.txt。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1186509|entityMap^0|J|4|Q|4|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

If you are getting an empty log file, try change the extension of file from <code>.log</code> to <code>.txt</code>.

blocks|key|972267|text|public+static+void+saveLogInSDCard(Context+context){
++++String+filename+=+Environment.getExternalStorageDirectory()+%2B+File.separator+%2B+"project_app.log";
++++String+command+=+"logcat+-d+*:V";

++++try{
++++++++Process+process+=+Runtime.getRuntime().exec(command);

++++++++BufferedReader+in+=+new+BufferedReader(new+InputStreamReader(process.getInputStream()));
++++++++String+line+=+null;
++++++++try{
++++++++++++File+file+=+new+File(filename);
++++++++++++file.createNewFile();
++++++++++++FileWriter+writer+=+new+FileWriter(file);
++++++++++++while((line+=+in.readLine())+!=+null){
++++++++++++++++writer.write(line+%2B+"\n");
++++++++++++}
++++++++++++writer.flush();
++++++++++++writer.close();
++++++++}
++++++++catch(IOException+e){
++++++++++++e.printStackTrace();
++++++++}
++++}
++++catch(IOException+e){
++++++++e.printStackTrace();
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|972268|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>public static void saveLogInSDCard(Context context){
 String filename = Environment.getExternalStorageDirectory() + File.separator + "project_app.log";
 String command = "logcat -d *:V";

 try{
 Process process = Runtime.getRuntime().exec(command);

 BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
 String line = null;
 try{
 File file = new File(filename);
 file.createNewFile();
 FileWriter writer = new FileWriter(file);
 while((line = in.readLine()) != null){
 writer.write(line + "\n");
 }
 writer.flush();
 writer.close();
 }
 catch(IOException e){
 e.printStackTrace();
 }
 }
 catch(IOException e){
 e.printStackTrace();
 }
}
</code></pre>

I'm trying to redirect the log of my app to the sdcard file. But i failed to do so. I'm trying something like this.

<pre><code>String cmd= "logcat -v time ActivityManager:W myapp:D *:* &gt;\""+file.getAbsolutePath()+"\"";
Runtime.getRuntime().exec(cmd);
</code></pre>

I tried the -f option also but it is not working either.

How to redirect my log output from logcat to the SD-Card on an android device?

日志文件

文件系统

我正在尝试将我的应用程序的日志重定向到sdcard文件。但我没有做到这一点。我正在尝试这样的东西。String cmd= "logcat -v time   ActivityManager:W  myapp:D  *:* >\""+file.getAbsolutePath()+"\"";Runtime.getRunti...

问如何将日志输出从logcat重定向到android设备上的SD-Card？
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