Use log4j to output log content to sd card in Android

In Android, the implementation of the output log content in the SD card file, the practice is:

Or relatively, log4j, is useful.

1. Download the Android log4j library (in the package)

Go: http://code.google.com/p/android-logging-log4j/

download the corresponding android-logging-log4j-1.0.3.jar , added to the project.

2. Download the dependent Apache log4j Library

Go: http://logging.apache.org/log4j/1.2/download.html

Download the 1.2 series version of: Log4j-1.2.17.zip

Unzip to get Log4j-1.2.17.jar added to the project.

3. Writing the test code:

Package com.test.usb;import java.io.file;import org.apache.http.client.methods.httppost;import  org.apache.http.entity.bytearrayentity;import org.apache.http.impl.client.defaulthttpclient;import  org.apache.log4j.Level;import org.apache.log4j.Logger;import  de.mindpipe.android.logging.log4j.logconfigurator;import android.app.activity;import  android.os.bundle;import android.os.environment;import android.util.log;import  Android.widget.textview;public class mainactivity extends activity{private logger  gLogger;bsit_cardreader reader; textview txt,txt1,txt2,txt3,txt4,txt5;private static final string tag =  MainActivity.class.getCanonicalName ();  public void configlog ()     {         final logconfigurator logconfigurator = new  logconfigurator ();                 logconfigurator.setfilename ( Environment.getexternalstoragedirectory ()  + File.separator +  "Crifanli_log4j.txt");         // Set the root log level         logconfigurator.setrootlevel (Level.debug);         // Set log level of a specific logger         logconfigurator.setlevel ("Org.apache",  level.error);         logconfigurator.configure ();          Glogger = logger.getlogger (This.getclass ());//         Glogger = logger.getlogger ("Crifanlilog4jtest");             }     @Override     protected void oncreate (bundle savedinstancestate)  {        super.oncreate (savedinstancestate);         setcontentview (R.layout.activity_main);         configlog ();         glogger.debug ("test android  Log to file in sd card using log4j ");         txt= (TextView)  findviewbyid (r.id.txt);         txt1= ( TextView)  findviewbyid (R.ID.TXT1)         txt2= (TextView)   Findviewbyid (R.ID.TXT2);         txt3= (TextView)  findviewbyid ( R.ID.TXT3);         txt4= (TextView)  findviewbyid (R.ID.TXT4);         txt5= (TextView)  findviewbyid (R.ID.TXT5);         Reader = new bsit_cardreader ();        int  Openresult = reader.openreader (this);         txt.settext (" Mainactivity--reader = "+ openresult); &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;LOG.I (TAG,   "---------------4---mainactivity--reader ="  + openresult);//7         int bslot = 0 ; //non-contact card channel          byte[] atr = reader.card_poweron (Bslot);        &NBSP;LOG.I (tag,  "---------------5---mainactivity--atr ="  + atr);         txt1.settext ("mainactivity--reader =" + openresult);         byte[] cmd = new byte[5];        cmd[0] = 0x00;         cmd[1] = -124;         cmd[2] = 0x00;         cmd[3] =  0x00;        cmd[4] = 0x08;      &NBSP;&NBSP;&NBSP;LOG.I (tag,  "---------------6---mainactivity--cmd ="  + cmd[1]);         txt2.settext ("mainactivity--cmd =" + cmd[1]);   &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;BYTE[]&NBSP;RESP=&NBSP;READER.SENDAPDU (Bslot, 5, cmd);               for  (int i =  0; i < resp.length; i++)  {log.i (tag,  "------------7-------resp["  +  i +  "]="  +&nbSp;resp[i]);  txt3.settext ("------------7-------resp["  + i +  "]="  + resp[i]) ;}         reader.card_poweroff (Bslot);                 //         byte cmd =  (Byte)  0x84;//        log.i (TAG,   "---------------6---mainactivity--cmd ="  + cmd);    }         public boolean post (byte[] paramarrayofbyte,string  HTTP)  {         bytearrayentity arrayentity =  new bytearrayentity (Paramarrayofbyte);          Arrayentity.setcontenttype ("Application/octet-stream");          Httppost httppost =&nbsP;new httppost (HTTP);          httppost.setentity (arrayEntity );         defaulthttpclient client = new  Defaulthttpclient ();         try {              int result=client.execute (HttpPost). GetStatusLine () . Getstatuscode (); &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;LOG.I (TAG,   "post="  + result);              txt4.settext ("post="  + result);         } catch   (exception e)  {              Throw new runtimeexception (e);         }          return false;     }} 

Can be achieved:

(1) The corresponding Crifanli_log4j.txt file can be generated in the/mnt/sdcard

(2) The contents of the log output are debug and correspond to their own string identifiers Crifanlilog4jtest

Therefore, you can download an additional item called ANDROID-LOGGING-LOG4J, the address in:
Http://code.google.com/p/android-logging-log4j/downloads/list, note that the original log4j is still needed.

in Androidmanifest.xml, add the following settings:
<uses-permission android:name= "Android.permission.WRITE_EXTERNAL_STORAGE"/>
   is then used in the program as follows:  

package com.android.myapp;     import java.io.file;        import org.apache.log4j.Level;       import  org.apache.log4j.logger;  import android.app.application;        import android.os.Environment;       import  de.mindpipe.android.logging.log4j.logconfigurator;      public class  myapplication extends application {                 @Override                 public void oncreate ()  {                        super.oncreate ();                         Logconfigurator logconfigurator = new logconfigurator ();                         Logconfigurator.setfilename (Environment.getexternalstoragedirectory ()                                          +  file.separator +  "MyApp"  + File.separator +  "Logs"                                          +  file.separator +  "Log4j.txt");                         logconfigurator.setrootlevel (Level.debug);                         Logconfigurator.setlevel ("Org.apache",  level.error);                         Logconfigurator.setfilepattern ("%d %-5p [%c{2}]-[%l] %m%n");                         Logconfigurator.setmaxfilesize (1024 * 1024 * 5);                         Logconfigurator.setimmediateflush (true);                         Logconfigurator.configure ();                        logger log = logger.getlogger ( Myapplication.class);                        log.info ("my application created");                }        }

  now the log is to:  
environment.getexternalstoragedirectory () + File.separator + "MyApp" + file.separator + "Logs" + File.separator + "log4j. txt 
   Way to save it.

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Use log4j to output log content to sd card in Android