java.io.FileNotFoundException (Read-only file system) happens before reconfiguration about logback-android HOT 2 CLOSED

Instead of trying to prevent the exception (a symptom), I think you should be wondering how to get the SD card's path into a variable for use in logback configuration files. This assumes you prefer maximum portability by not using an absolute path to the SD card (which is smart :).

The init() function you're using is flawed and actually unnecessary. It looks like you were trying to restart the auto-config after setting an environment variable to store the SD path (so that you can use that variable in a file path for the RollingFileAppender). And then you were printing the JoranException once in a catch block, again by StatusPrinter.printInCaseOfErrorsOrWarnings, and yet again from the debug='true' setting from your logback config. So, you'd see the same error printed 3 times in logcat (probably not what you wanted). Finally, the init() directly uses classes from logback, thus adding an unnecessary dependency and defeating the point of the SLF4J facade.

Luckily, you can accomplish your goal without all this init() stuff you have going on. Android exposes the SD card path in an environment variable, named EXTERNAL_STORAGE. (I'm not sure which Android versions expose this, but I just verified Jelly Bean 4.1.1.) Logback configuration can read environment variables and can define local properties. Armed with these tools, you can use the following config without any initialization code and without any extra dependencies beyond SLF4J (note the single <property> element I added to your original config):

<configuration>
    <appender
        name="LOGCAT"
        class="ch.qos.logback.classic.android.LogcatAppender" >
        <tagEncoder>
            <pattern>%logger{0}</pattern>
        </tagEncoder>
        <encoder>
            <pattern>%d{HH:mm:ss} - %msg %n</pattern>
        </encoder>
    </appender>


    <!--
    ########################################################
     Use Android's built-in environment variable for the
     path to the SD card: EXTERNAL_STORAGE
    ########################################################
    -->
    <property name="log_path" value="${EXTERNAL_STORAGE}/neusoft/mdm/log/" />



    <appender
        name="File"
        class="ch.qos.logback.core.rolling.RollingFileAppender" >
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
                <pattern>%d{HH:mm:ss} [%thread] [%.-1level] - %msg %n</pattern>
        </encoder>

        <File>${log_path:-}agent.log</File>

        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy" >
            <FileNamePattern>${log_path:-}agent.%d{yyyy-MM-dd}.zip</FileNamePattern>
            <!-- keep 7 days' worth of history -->
            <MaxHistory>7</MaxHistory>

            <TimeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP" >
                <MaxFileSize>10MB</MaxFileSize><!-- MaxFileSize should be just above daily log size -->
            </TimeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
    </appender>

    <root level="TRACE" >
        <!-- <appender-ref ref="LOGCAT" />  -->
        <appender-ref ref="File" />
    </root>
</configuration>

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