Androd封装一个Log打印工具一键实现打印不打印

在写项目的时候，我们是避免不了用到安卓里面的Log打印工具的，但是当代码越写越多的时候我们这加个Log 那加个Log，当我们项目要上线的时候，我们总会忘记哪有Log，很麻烦啊，当时杀人的心都有了，现在封装一个Log工具，只需要定义boolean就可以一键实现打印和不打印功能，直接复制过去拿到项目里面用就行！

不要感谢我，请叫我雷锋

package com.example.qlog;

import java.util.Calendar;

public final class QLog {
public static final boolean DEBUG = true;//是否打印

/**
* Send a {@link #VERBOSE} log message.
*
* @param tag Used to identify the source of a log message. It usually identifies the class or activity where the
* log call occurs.
* @param msg The message you would like logged.
*/
public static int v(String tag, String format, Object... args) {
if (DEBUG) {
if (args == null || args.length == 0) {
return android.util.Log.v(tag, format);
}
return android.util.Log.v(tag, String.format(format, args));
}
return 0;
}

/**
* Send a {@link #DEBUG} log message.
*
* @param tag Used to identify the source of a log message. It usually identifies the class or activity where the
* log call occurs.
* @param msg The message you would like logged.
*/
public static int d(String tag, String format, Object... args) {
if (DEBUG) {
if (args == null || args.length == 0) {
return android.util.Log.d(tag, format);
}

return android.util.Log.d(tag, String.format(format, args));
}
return 0;
}

/**
* Send an {@link #INFO} log message.
*
* @param tag Used to identify the source of a log message. It usually identifies the class or activity where the
* log call occurs.
* @param msg The message you would like logged.
*/
public static int i(String tag, String format, Object... args) {
if (DEBUG) {
if (args == null || args.length == 0) {
return android.util.Log.i(tag, format);
}
return android.util.Log.i(tag, String.format(format, args));
}
return 0;
}

/**
* Send a {@link #WARN} log message.
*
* @param tag Used to identify the source of a log message. It usually identifies the class or activity where the
* log call occurs.
* @param msg The message you would like logged.
*/
public static int w(String tag, String format, Object... args) {
if (DEBUG) {
if (args == null || args.length == 0) {
return android.util.Log.w(tag, format);
}
return android.util.Log.w(tag, String.format(format, args));
}
return 0;
}

/**
* Send a {@link #WARN} log message and log the exception.
*
* @param tag Used to identify the source of a log message. It usually identifies the class or activity where the
* log call occurs.
* @param tr An exception to log
*/
public static int w(String tag, Throwable tr) {
if (DEBUG) {
return android.util.Log.w(tag, tr);
}
return 0;
}

/**
* Send an {@link #ERROR} log message.
*
* @param tag Used to identify the source of a log message. It usually identifies the class or activity where the
* log call occurs.
* @param msg The message you would like logged.
*/
public static int e(String tag, String msg, Throwable e) {
if (DEBUG) {
return android.util.Log.e(tag, msg, e);
}
return 0;
}

/**
* Send an {@link #ERROR} log message.
*
* @param tag Used to identify the source of a log message. It usually identifies the class or activity where the
* log call occurs.
* @param msg The message you would like logged.
*/
public static int e(String tag, String msg) {
if (DEBUG) {
return android.util.Log.e(tag, msg);
}
return 0;
}

/**
* Low-level logging call.
*
* @param priority The priority/type of this log message
* @param tag Used to identify the source of a log message. It usually identifies the class or activity where the
* log call occurs.
* @param msg The message you would like logged.
* @return The number of bytes written.
*/
public static int println(int priority, String tag, String msg) {
if (DEBUG) {
return android.util.Log.println(priority, tag, msg);
}
return 0;
}

/**
* 打印调用时间
*
* @param cur �?��的时�?
* @return 调用时间
*/
public static long debugDuration(long cur) {
long sec = System.currentTimeMillis();
StackTraceElement elem = Thread.currentThread().getStackTrace()[3];
d("Performance", elem.getFileName() + "_" + elem.getLineNumber() + ":" + (sec - cur));
return sec;
}

/**
* 打印当前调用的位置： 文件 行号 方法
*
* @param tag
* @return
*/
public static int printLogPos(String tag) {
StackTraceElement elem = Thread.currentThread().getStackTrace()[3];
return d(tag, elem.getClassName() + ":" + elem.getLineNumber() + "::" + elem.getMethodName());
}

/**
* 获得当前调用位置�?类名
*
* @param depth 堆栈深度
* @return
*/
public static String getLogPos(int depth) {
StackTraceElement elem = Thread.currentThread().getStackTrace()[depth];
return elem.getClassName();
}

/**
* depth = 4
*
* @see #getLogPos(int)
* @return
*/
public static String getLogPos() {
return getLogPos(4);
}

/**
* 获得当前�?code>from</code>�?��的秒�? *
* @param from
* @return
*/
public static long getSecond(Calendar from) {
return (System.currentTimeMillis() - from.getTimeInMillis()) / 1000;
}

private static final Calendar _20120101 = Calendar.getInstance();
static {
_20120101.set(2012, 0, 0, 0, 0, 0);
}

/**
* from = 20120101
*
* @see #getSecond(Calendar)
* @return
*/
public static long getSecond() {
return getSecond(_20120101);
}

}