android Log日志输出

1、打出的log后面要根上这个log的文件源头的连接，我可以直接点击跳转到log的位置

2、log中还能提示我当前的线程名，方便调试

3、可以打印出map，json这样的对象

4、release包中不打印log

5、可以控制log是否显示

import android.util.Log;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.Map;
import java.util.Set;

/**
* 普通的Log管理类
*/
public class LogUtils {
/**
* Drawing toolbox
*/
private static final char TOP_LEFT_CORNER = '╔';
private static final char BOTTOM_LEFT_CORNER = '╚';
private static final char MIDDLE_CORNER = '╟';
private static final char HORIZONTAL_DOUBLE_LINE = '║';
private static final String DOUBLE_DIVIDER = "════════════════════════════════════════════";
private static final String SINGLE_DIVIDER = "────────────────────────────────────────────";
private static final String TOP_BORDER = TOP_LEFT_CORNER + DOUBLE_DIVIDER + DOUBLE_DIVIDER;
private static final String BOTTOM_BORDER = BOTTOM_LEFT_CORNER + DOUBLE_DIVIDER + DOUBLE_DIVIDER;
private static final String MIDDLE_BORDER = MIDDLE_CORNER + SINGLE_DIVIDER + SINGLE_DIVIDER;
private static final char I = 'I', W = 'W', D = 'D', E = 'E', V = 'V', A = 'A', M = 'M';

static String LINE_SEPARATOR = System.getProperty("line.separator"); //等价于"\n\r"，唯一的作用是能装逼
static int JSON_INDENT = 4;

private LogUtils() {
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}

public static boolean isDebug = true;// 是否需要打印bug，可以在application的onCreate函数里面初始化
private static final String TAG = "----->";

/**
* 打印MAp
*/
public static void m(Map map) {
Set set = map.entrySet();
if (set.size() < 1) {
printLog(D, "[]");
return;
}

int i = 0;
String[] s = new String[set.size()];
for (Object aSet : set) {
Map.Entry entry = (Map.Entry) aSet;
s[i] = entry.getKey() + " = " + entry.getValue() + ",\n";
i++;
}
printLog(V, s);
}

/**
* 打印JSON
*
* @param jsonStr
*/
public static void j(String jsonStr) {
if (isDebug) {
String message;
try {
if (jsonStr.startsWith("{")) {
JSONObject jsonObject = new JSONObject(jsonStr);
message = jsonObject.toString(JSON_INDENT); //这个是核心方法
} else if (jsonStr.startsWith("[")) {
JSONArray jsonArray = new JSONArray(jsonStr);
message = jsonArray.toString(JSON_INDENT);
} else {
message = jsonStr;
}
} catch (JSONException e) {
message = jsonStr;
}

message = LINE_SEPARATOR + message;
String[] lines = message.split(LINE_SEPARATOR);
StringBuilder sb = new StringBuilder();
printLog(D, lines);
}
}

// 下面四个是默认tag的函数
public static void i(String... msg) {
if (isDebug)
printLog(I, msg);
}

public static void d(String... msg) {
if (isDebug)
printLog(D, msg);
}

public static void w(String... msg) {
if (isDebug)
printLog(W, msg);
}

public static void e(String... msg) {
if (isDebug)
printLog(E, msg);
}

public static void v(String... msg) {
if (isDebug)
printLog(V, msg);
}

// 下面是传入自定义tag的函数
public static void i(String tag, String msg) {
if (isDebug)
Log.i(tag, msg);
}

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

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

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

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

//带异常的
public static void i(String tag, String msg, Throwable tr) {
if (isDebug)
Log.i(tag, msg, tr);
}

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

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

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

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

/**
* 同意打印
*
* @param type
* @param str
*/
private static void printHunk(char type, String str) {
switch (type) {
case I:
Log.i(TAG, str);
break;
case D:
Log.d(TAG, str);
break;
case E:
Log.e(TAG, str);
break;
case V:
Log.v(TAG, str);
break;
case A:
Log.wtf(TAG, str);
break;
case W:
Log.w(TAG, str);
break;
}
}

/**
* 打印头部信息
*
* @param type
*/
private static void printHead(char type) {
printHunk(type, TOP_BORDER);
printHunk(type, HORIZONTAL_DOUBLE_LINE + "   Thread:");
printHunk(type, HORIZONTAL_DOUBLE_LINE + "   " + Thread.currentThread().getName());
printHunk(type, MIDDLE_BORDER);
}

/**
* 打印Log被调用的位置
*
* @param type
*/
private static void printLocation(char type, String... msg) {
StackTraceElement[] stack = Thread.currentThread().getStackTrace();
int i = 0;
for (StackTraceElement e : stack) {
String name = e.getClassName();
if (!name.equals(LogUtils.class.getName())) {
i++;
} else {
break;
}
}
i += 3;
String className = stack[i].getFileName();
String methodName = stack[i].getMethodName();
int lineNumber = stack[i].getLineNumber();
StringBuilder sb = new StringBuilder();
printHunk(type, HORIZONTAL_DOUBLE_LINE + "   Location:");
sb.append(HORIZONTAL_DOUBLE_LINE)
.append("   (").append(className).append(":").append(lineNumber).append(")# ").append(methodName);
printHunk(type, sb.toString());
printHunk(type, msg == null || msg.length == 0 ? BOTTOM_BORDER : MIDDLE_BORDER);
}

/**
* 打印消息
*
* @param type
* @param msg
*/
private static void printMsg(char type, String... msg) {
printHunk(type, HORIZONTAL_DOUBLE_LINE + "   msg:");
for (String str : msg) {
printHunk(type, HORIZONTAL_DOUBLE_LINE + "   " + str);
}
printHunk(type, BOTTOM_BORDER);
}

/**
* 打印log
*
* @param type
* @param msg
*/
private static void printLog(char type, String... msg) {
printHead(type);
printLocation(type, msg);
if (msg == null || msg.length == 0) {
return;
}
printMsg(type, msg);
}

}

原文链接和参考链接

http://www.jianshu.com/p/8bce4580c57e

https://github.com/AriaLyy/BlogDemo/blob/master/MyLoggerDemo/app/src/main/java/com/example/yuyu/mylogger/L.java

http://blog.csdn.net/wangshihui512/article/details/51042704