Android日志工具類

import org.apache.commons.lang3.time.DateFormatUtils;

import android.os.Environment;

import android.util.Log;
/**

日志記錄 
*/

public class LogUtil {

/**

開發階段 
*/

private static final int DEVELOP = 0;

/** 
內部測試階段 
*/

private static final int DEBUG = 1;

/** 
公開測試 
*/

private static final int BATE = 2;

/** 
正式版 
*/

private static final int RELEASE = 3;  

/**

當前階段標示 
*/

private static int currentStage = DEVELOP;  

private static String path;

private static File file;

private static FileOutputStream outputStream;

private static String pattern = "yyyy-MM-dd HH:mm:ss";
static {

if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {  
    File externalStorageDirectory = Environment.getExternalStorageDirectory();  
    path = externalStorageDirectory.getAbsolutePath() + "/zcw/";  
    File directory = new File(path);  
    if (!directory.exists()) {  
        directory.mkdirs();  
    }  
    file = new File(new File(path), "log.txt");  
    android.util.Log.i("SDCAEDTAG", path);  
    try {  
        outputStream = new FileOutputStream(file, true);  
    } catch (FileNotFoundException e) {  

    }  
} else {  

}  

}
public static void info(String msg) {

info(LogUtil.class, msg);  

}
public static void info(Class clazz, String msg) {

switch (currentStage) {  
    case DEVELOP:  
        // 控制臺輸出  
        Log.i(clazz.getSimpleName(), msg);  
        break;  
    case DEBUG:  
        // 在應用下面創建目錄存放日志  

        break;  
    case BATE:  
        // 寫日志到sdcard  
        Date date = new Date();  
        String time = DateFormatUtils.format(date, pattern);  
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {  
            if (outputStream != null) {  
                try {  
                    outputStream.write(time.getBytes());  
                    String className = "";  
                    if (clazz != null) {  
                        className = clazz.getSimpleName();  
                    }  
                    outputStream.write(("    " + className + "\r\n").getBytes());  

                    outputStream.write(msg.getBytes());  
                    outputStream.write("\r\n".getBytes());  
                    outputStream.flush();  
                } catch (IOException e) {  

                }  
            } else {  
                android.util.Log.i("SDCAEDTAG", "file is null");  
            }  
        }  
        break;  
    case RELEASE:  
        // 一般不做日志記錄  
        break;  
}  

}

}  </pre>