Android中使用log4j输出log内容到sd卡
16lz
2021-01-23
在android中，实现输出log内容到sd卡中的文件里面，做法是：
还是相对来说，log4j，算是好用。
1.下载android的log4j的库（的封装）
去：http://code.google.com/p/android-logging-log4j/
下载对应的android-logging-log4j-1.0.3.jar，加到项目中。
2.再去下载所依赖的apache的log4j库
去：http://logging.apache.org/log4j/1.2/download.html
下载1.2系列版本的：log4j-1.2.17.zip
解压得到log4j-1.2.17.jar加到项目中。
3.写测试代码：
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); Log.i(TAG, "---------------4---MainActivity--reader =" + openResult);//7 int bslot = 0 ; //非接触卡通道 byte[] atr = reader.card_poweron(bslot); 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; Log.i(TAG, "---------------6---MainActivity--cmd =" + cmd[1]); txt2.setText("MainActivity--cmd ="+ cmd[1]); byte[] resp= reader.sendapdu(bslot, 5, cmd); for (int i = 0; i < resp.length; i++) {Log.i(TAG, "------------7-------resp[" + i + "]=" + 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 = new HttpPost(http); httpPost.setEntity(arrayEntity); DefaultHttpClient client = new DefaultHttpClient(); try { int result=client.execute(httpPost).getStatusLine().getStatusCode(); Log.i(TAG, "post=" + result); txt4.setText("post=" + result); } catch (Exception e) { throw new RuntimeException(e); } return false; }} 即可实现：
（1）可以在/mnt/sdcard中生成对应的crifanli_log4j.txt文件
（2）log输出的内容中，是DEBUG，且对应的是自己的字符串标识符CrifanLiLog4jTest
因此，可以另外多下载一个叫android-logging-log4j的项目，地址在：
http://code.google.com/p/android-logging-log4j/downloads/list，注意，原本的log4j还是需要的。
在AndroidManifest.xml中，增加如下设置：
然后在程序中如下使用：
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"); } } 现在日志则是以：
Environment.getExternalStorageDirectory() + File.separator + "MyApp" + File.separator + "logs" + File.separator + "log4j.txt
的方式保存了。