How to capture application log

最新推荐文章于 2025-07-12 09:20:07 发布

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最新推荐文章于 2025-07-12 09:20:07 发布

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分类专栏： Android 文章标签： application string command null output android

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本文介绍如何在Android应用中请求READ_LOGS权限，并通过logcat命令从手机上获取应用日志输出。文中提供了捕获日志的具体Java代码示例，并推荐了过滤错误级别日志及应用程序特定日志的方法。

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You must request the android.permission.READ_LOGS in your Android Manifest.

Then you can run the logcat from the command line on the phone, and just get a dump of the output. I recommend filtering the output for both AndroidRuntime with the error level only (to gather exceptions that crashed your app) as well as all messages from your app's log tag.

Process mLogcatProc = null;
BufferedReader reader = null;
try
{
        mLogcatProc = Runtime.getRuntime().exec(new String[]
                {"logcat", "-d", "AndroidRuntime:E [Your Log Tag Here]:V *:S" });

        reader = new BufferedReader(new InputStreamReader
(mLogcatProc.getInputStream()));

        String line;
        final StringBuilder log = new StringBuilder();
        String separator = System.getProperty("line.separator"); 

        while ((line = reader.readLine()) != null)
        {
                log.append(line);
                log.append(separator);
        }

        // do whatever you want with the log.  I'd recommend using Intents to create an email
}

catch (IOException e)
{
        ...
}

finally
{
        if (reader != null)
                try
                {
                        reader.close();
                }
                catch (IOException e)
                {
                        ...
                }

} 
// see http://androidsnippets.com/how-to-capture-application-log

You can find the source of an sample application at http://code.google.com/p/android-random/source/browse/#svn/trunk/Logcat