flutter_logcat_monitor

Description:

flutter logcat monitor

flutter_logcat_monitor #
Flutter plugin to monitor the stream of system messages, stack traces etc using logcat command-line tool.
NOTE: This plugin fetches logcat logs only on Android Devices.
how to use #

Create a function to consume the logcat messages

void _mylistenStream(dynamic value) {
if (value is String) {
_logBuffer.writeln(value);
}
}
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Register your function as a listener to get logs then use it in anyway within your app.

FlutterLogcatMonitor.addListen(_mylistenStream);
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Start the logcat monitor passing the filter parameters as defined in logcat tool.

await FlutterLogcatMonitor.startMonitor("*.*");
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Installation #
Need permission in AndroidManifest.xml:
<uses-permission android:name="android.permission.READ_LOGS" />
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https://pub.dev/packages/flutter_logcat_monitor/install
example #
See the example code in example folder.
Here we use a StringBuffer to store the messages and display them on a log screen.



under the hood #
The FlutterLogcatMonitorPlugin runs event/method channel handlers in UI-thread and the logcat process monitor in a background thread as recomended by Google to not block the UI interface.



logcat filter options #

from the Android Developers logcat documentation:
filterspecs are a series of
<tag>[:priority]

where <tag> is a log component tag (or * for all) and priority is:
V Verbose (default for <tag>)
D Debug (default for '*')
I Info
W Warn
E Error
F Fatal
S Silent (suppress all output)

'*' by itself means '*:D' and <tag> by itself means <tag>:V.
If no '*' filterspec or -s on command line, all filter defaults to '*:V'.
eg: '*:S <tag>' prints only <tag>, '<tag>:S' suppresses all <tag> log messages.
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Examples:

*.* show ALL tags and priorities.
flutter,FlutterLogcatMonitorPlugin,S:* show flutter and FlutterLogcatMonitorPlugin and suppresses all others.