原文
http://www.androidres.com/index.php/2009/05/07/android-log-tutorials/
如果需要程序实现这个功能，需要在Manifest中添加Permission:
android.permission.READ_LOGS
应用Runtime.getRuntime().exec( parameters )启动Logcat，并返回一个Process对象，然后通过BufferedReader捕捉进程的数据流。
源代码：
01.Process mLogcatProc = null;
02.BufferedReader reader = null;
03.try
04.{
05.mLogcatProc = Runtime.getRuntime().exec(new String[]
06.{"logcat", "-d", "AndroidRuntime:E [Your Log Tag Here]:V *:S" });
07.
08.reader = new BufferedReader(new InputStreamReader
09.(mLogcatProc.getInputStream()));
10.
11.String line;
12.final StringBuilder log = new StringBuilder();
13.String separator = System.getProperty("line.separator");
14.
15.while ((line = reader.readLine()) != null)
16.{
17.log.append(line);
18.log.append(separator);
19.}
20.
21.// do whatever you want with the log. I'd recommend using Intents to create an email
22.}
23.
24.catch (IOException e)
25.{
26....
27.}
28.
29.finally
30.{
31.if (reader != null)
32.try
33.{
34.reader.close();
35.}
36.catch (IOException e)
37.{
38....
39.}
40.
41.