日志工具类LogUtil

**为方便测试，需要经常处理log是否打印的问题，有时为了方便统计，将错误日志生成到sd卡方便查看**

package com.manny.utils;
import android.content.Context;
import android.os.Environment;
import android.util.Log;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintStream;

/**
* Created by manny on 2017/12/28.
*/

public class LogUtils
{
public static final String TAG_DEFAULT = “MANNY”;
private static boolean isOutPut = false;
/**
*是否在sd卡记录错误日志
*/
private static boolean isDebug = false;

/**
 * 在程序初始化时调用，可以在Application的onCreate或者service的onCreate中
 * 若sd卡内存在log.dat 则true
 */
public static void isOutputLog( Context context )
{
    if( SdCardUtils.isSdCardExist() )
    {
        File file = new File( Environment.getExternalStorageDirectory() + "/Log.dat" );
        if( file.exists() )
        {
            isOutPut = true;
        }
        else
        {
            isOutPut = false;
        }
    }

}

public static void d( String msg )
{
    d( TAG_DEFAULT, msg );
}

public static void i( String msg )
{
    i( TAG_DEFAULT, msg );
}

public static void e( String msg )
{
    e( TAG_DEFAULT, msg );
}

public static void w( String msg )
{
    w( TAG_DEFAULT, msg );
}

public static void v( String msg )
{
    v( TAG_DEFAULT, msg );
}

public static void d(
        Class cls,
        String msg )
{
    d( TAG_DEFAULT, msg );
}

public static void v(
        Class cls,
        String msg )
{
    v( TAG_DEFAULT, msg );
}

public static void e(
        Class cls,
        String msg )
{
    e( TAG_DEFAULT, msg );
}

public static void i(
        Class cls,
        String msg )
{
    i( TAG_DEFAULT, msg );
}

public static void w(
        Class cls,
        String msg )
{
    w( TAG_DEFAULT, msg );
}

public static void v(
        String tag,
        String msg )
{
    if( isOutPut )
    {
        Log.v( tag, msg );
    }
}

public static void d(
        String tag,
        String msg )
{
    if( isOutPut )
    {
        Log.d( tag, msg );
    }
}

public static void i(
        String tag,
        String msg )
{
    if( isOutPut )
    {
        Log.i( tag, msg );
    }
}

public static void e(
        String tag,
        String msg )
{
    if( isOutPut )
    {
        Log.e( tag, msg );
    }
}

public static void w(
        String tag,
        String msg )
{
    if( isOutPut )
    {
        Log.w( tag, msg );
    }
}

/**
 * 记录错误日志并生成文件在sd卡内error.txt
 */
public static synchronized void e( Throwable ex )
{
    PrintStream ps = null;
    try
    {
        d( "", "begin e" );
        d( "", Log.getStackTraceString( ex ) );
        d( "", "end e" );
        if( isDebug )
        {
            if( SdCardUtils.isSdCardExist() )
            {
                ps = new PrintStream( new FileOutputStream( Environment.getExternalStorageDirectory() + "/error.txt", true ) );
                ex.printStackTrace( ps );
                ps.flush();
            }
        }
    }
    catch( Exception e )
    {
        e( e );
    }
    finally
    {
        try
        {
            if( null != ps )
            {
                ps.close();
            }

        }
        catch( Exception e )
        {
            e( e );
        }
    }
}

}