记一个可以打开，关闭的log日志

记录一个可以打开（输出），关闭（不输出）的log日志

public class MyLog {

    public static Boolean DEBUG = MyApplacation.DEBUG;//true或者false来表示
    private static final String TAG = "zhaojian";

    public static void init(Context context) {
        new ALog.Builder(context)
                .setLogSwitch(DEBUG)// 设置log总开关，默认开
                .setGlobalTag("Zhaojian")// 设置log全局标签，默认为空
                // 当全局标签不为空时，我们输出的log全部为该tag，
                // 为空时，如果传入的tag为空那就显示类名，否则显示tag
                .setDir(GlobalFilePath.CACHE_LOG)
                .setLogHeadSwitch(false)// 设置log头部是否显示，默认显示
                .setLog2FileSwitch(false)// 打印log时是否存到文件的开关，默认关
                .setBorderSwitch(false)// 输出日志是否带边框开关，默认开
                .setLogFilter(ALog.V);// log过滤器，和logcat过滤器同理，默认Verbose
    }

    public static void d(String s) {
        if (!TextUtils.isEmpty(s)) {
            if (DEBUG) ALog.d(TAG, s);
        } else {
            if (DEBUG) ALog.d(TAG, "The information can"t be null");
        }

    }

    public static void d(String MyTAG, String s) {
        if (!TextUtils.isEmpty(s)) {
            if (DEBUG) ALog.d(MyTAG, s);
        } else {
            if (DEBUG) ALog.d(MyTAG, "The information can"t be null");
        }
    }

    public static void v(String s) {
        if (!TextUtils.isEmpty(s)) {
            if (DEBUG) ALog.v(TAG, s);
        } else {
            if (DEBUG) ALog.v(TAG, "The information can"t be null");
        }

    }

    public static void v(String MyTAG, String s) {
        if (!TextUtils.isEmpty(s)) {
            if (DEBUG) ALog.v(MyTAG, s);
        } else {
            if (DEBUG) ALog.v(MyTAG, "The information can"t be null");
        }

    }

    public static void e(String s) {
        if (!TextUtils.isEmpty(s)) {
            if (DEBUG) ALog.e(TAG, s);
        } else {
            if (DEBUG) ALog.e(TAG, "The information can"t be null");
        }

    }

    public static void e(String MyTAG, String s) {
        if (!TextUtils.isEmpty(s)) {
            if (DEBUG) ALog.e(MyTAG, s);
        } else {
            if (DEBUG) ALog.e(MyTAG, "The information can"t be null");
        }

    }

    public static void json(String MyTAG, String s) {
        if (!TextUtils.isEmpty(s)) {
            if (DEBUG) ALog.json(MyTAG, s);
        } else {
            if (DEBUG) ALog.json(MyTAG, "The information can"t be null");
        }
    }

    public static void json(String s) {
        if (!TextUtils.isEmpty(s)) {
            if (DEBUG) ALog.json(s);
        } else {
            if (DEBUG) ALog.json("The information can"t be null");
        }
    }

    public static void xml(String MyTAG, String s) {
        if (!TextUtils.isEmpty(s)) {
            if (DEBUG) ALog.xml(MyTAG, s);
        } else {
            if (DEBUG) ALog.xml(MyTAG, "The information can"t be null");
        }
    }

    public static void xml(String s) {
        if (!TextUtils.isEmpty(s)) {
            if (DEBUG) ALog.xml(s);
        } else {
            if (DEBUG) ALog.xml("The information can"t be null");
        }
    }

    public static void file(String MyTAG, String s) {
        if (!TextUtils.isEmpty(s)) {
            if (DEBUG) ALog.file(MyTAG, s);
        } else {
            if (DEBUG) ALog.e(MyTAG, "The information can"t be null");
        }
    }

    public static void file(String s) {
        if (!TextUtils.isEmpty(s)) {
            if (DEBUG) ALog.file(s);
        } else {
            if (DEBUG) ALog.e("The information can"t be null");
        }
    }

}

上面代码中提到的一个是在Applicaiotn中掌握关闭或开关，一个是Alog可以打印返回的数据特别长时，控制台展示不全的解决方法和直接可打印json数据

public static boolean DEBUG = true;

上面这句代码放在applicaiton入口处，当debug为true时，代表在控制台可以输出日志，为false时是不可以输出日志的

public final class ALog {

    public static final int V = 0x01;
    public static final int D = 0x02;
    public static final int I = 0x04;
    public static final int W = 0x08;
    public static final int E = 0x10;
    public static final int A = 0x20;

    @IntDef({V, D, I, W, E, A})
    @Retention(RetentionPolicy.SOURCE)
    private @interface TYPE {
    }

    private static final int FILE = 0xF1;
    private static final int JSON = 0xF2;
    private static final int XML  = 0xF4;
    private static ExecutorService executor;
    private static String          defaultDir;// log默认存储目录
    private static String          dir;       // log存储目录

    private static boolean sLogSwitch       = true; // log总开关，默认开
    private static String  sGlobalTag       = null; // log标签
    private static boolean sTagIsSpace      = true; // log标签是否为空白
    private static boolean sLogHeadSwitch   = true; // log头部开关，默认开
    private static boolean sLog2FileSwitch  = false;// log写入文件开关，默认关
    private static boolean sLogBorderSwitch = true; // log边框开关，默认开
    private static int     sLogFilter       = V;    // log过滤器

    private static final String FILE_SEP      = System.getProperty("file.separator");
    private static final String LINE_SEP      = System.getProperty("line.separator");
    private static final String TOP_BORDER    = "╔═══════════════════════════════════════════════════════════════════════════════════════════════════";
    private static final String LEFT_BORDER   = "║ ";
    private static final String BOTTOM_BORDER = "╚═══════════════════════════════════════════════════════════════════════════════════════════════════";
    private static final int    MAX_LEN       = 4000;
    private static final Format FORMAT        = new SimpleDateFormat("MM-dd HH:mm:ss.SSS ", Locale.getDefault());

    private static final String NULL_TIPS = "Log with null object.";
    private static final String NULL      = "null";
    private static final String ARGS      = "args";

    private ALog() {
        throw new UnsupportedOperationException("u can"t instantiate me...");
    }

    public static class Builder {
        public Builder(@NonNull Context context) {
            if (defaultDir != null) return;
            if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
                    && context.getExternalCacheDir() != null)
                defaultDir = context.getExternalCacheDir() + FILE_SEP + "log" + FILE_SEP;
            else {
                defaultDir = context.getCacheDir() + FILE_SEP + "log" + FILE_SEP;
            }
        }

        public Builder setLogSwitch(boolean logSwitch) {
            ALog.sLogSwitch = logSwitch;
            return this;
        }

        public Builder setGlobalTag(final String tag) {
            if (isSpace(tag)) {
                ALog.sGlobalTag = "";
                sTagIsSpace = true;
            } else {
                ALog.sGlobalTag = tag;
                sTagIsSpace = false;
            }
            return this;
        }

        public Builder setLogHeadSwitch(boolean logHeadSwitch) {
            ALog.sLogHeadSwitch = logHeadSwitch;
            return this;
        }

        public Builder setLog2FileSwitch(boolean log2FileSwitch) {
            ALog.sLog2FileSwitch = log2FileSwitch;
            return this;
        }

        public Builder setDir(final String dir) {
            if (isSpace(dir)) {
                ALog.dir = null;
            } else {
                ALog.dir = dir.endsWith(FILE_SEP) ? dir : dir + FILE_SEP;
            }
            return this;
        }

        public Builder setDir(final File dir) {
            ALog.dir = dir == null ? null : dir.getAbsolutePath() + FILE_SEP;
            return this;
        }

        public Builder setBorderSwitch(boolean borderSwitch) {
            ALog.sLogBorderSwitch = borderSwitch;
            return this;
        }

        public Builder setLogFilter(@TYPE int logFilter) {
            ALog.sLogFilter = logFilter;
            return this;
        }

        @Override
        public String toString() {
            return "switch: " + sLogSwitch
                    + LINE_SEP + "tag: " + (sGlobalTag.equals("") ? "null" : sGlobalTag)
                    + LINE_SEP + "head: " + sLogHeadSwitch
                    + LINE_SEP + "file: " + sLog2FileSwitch
                    + LINE_SEP + "dir: " + (dir == null ? defaultDir : dir)
                    + LINE_SEP + "border: " + sLogBorderSwitch
                    + LINE_SEP + "filter: " + (sLogFilter == V ? "verbose" : "not verbose");
        }
    }

    public static void v(Object contents) {
        log(V, sGlobalTag, contents);
    }

    public static void v(String tag, Object... contents) {
        log(V, tag, contents);
    }

    public static void d(Object contents) {
        log(D, sGlobalTag, contents);
    }

    public static void d(String tag, Object... contents) {
        log(D, tag, contents);
    }

    public static void i(Object contents) {
        log(I, sGlobalTag, contents);
    }

    public static void i(String tag, Object... contents) {
        log(I, tag, contents);
    }

    public static void w(Object contents) {
        log(W, sGlobalTag, contents);
    }

    public static void w(String tag, Object... contents) {
        log(W, tag, contents);
    }

    public static void e(Object contents) {
        log(E, sGlobalTag, contents);
    }

    public static void e(String tag, Object... contents) {
        log(E, tag, contents);
    }

    public static void a(Object contents) {
        log(A, sGlobalTag, contents);
    }

    public static void a(String tag, Object... contents) {
        log(A, tag, contents);
    }

    public static void file(Object contents) {
        log(FILE, sGlobalTag, contents);
    }

    public static void file(String tag, Object contents) {
        log(FILE, tag, contents);
    }

    public static void json(String contents) {
        log(JSON, sGlobalTag, contents);
    }

    public static void json(String tag, String contents) {
        log(JSON, tag, contents);
    }

    public static void xml(String contents) {
        log(XML, sGlobalTag, contents);
    }

    public static void xml(String tag, String contents) {
        log(XML, tag, contents);
    }

    private static void log(int type, String tag, Object... contents) {
        if (!sLogSwitch) return;
        final String[] processContents = processContents(type, tag, contents);
        tag = processContents[0];
        String msg = processContents[1];
        switch (type) {
            case V:
            case D:
            case I:
            case W:
            case E:
            case A:
                if (type >= sLogFilter) {
                    printLog(type, tag, msg);
                    if (sLog2FileSwitch) {
                        print2File(tag, msg);
                    }
                }
                break;
            case FILE:
                print2File(tag, msg);
                break;
            case JSON:
                printLog(E, tag, msg);
                break;
            case XML:
                printLog(E, tag, msg);
                break;
        }
    }

    private static String[] processContents(int type, String tag, Object... contents) {
        String head = "";
        if (!sTagIsSpace && !sLogHeadSwitch) {
            tag = sGlobalTag;
        }else {
            StackTraceElement targetElement = Thread.currentThread().getStackTrace()[5];
            String className = targetElement.getClassName();
            String[] classNameInfo = className.split("\.");
            if (classNameInfo.length > 0) {
                className = classNameInfo[classNameInfo.length - 1];
            }
            if (className.contains("$")) {
                className = className.split("\$")[0];
            }
            if (sTagIsSpace) {
                tag = isSpace(tag) ? className : tag;
            }
            if (sLogHeadSwitch) {
                head = new Formatter()
                        .format("Thread: %s, %s(%s.java:%d)" + LINE_SEP,
                                Thread.currentThread().getName(),
                                targetElement.getMethodName(),
                                className,
                                targetElement.getLineNumber())
                        .toString();
            }
        }
        String body = NULL_TIPS;
        if (contents != null) {
            if (contents.length == 1) {
                Object object = contents[0];
                body = object == null ? NULL : object.toString();
                if (type == JSON) {
                    body = formatJson(body);
                } else if (type == XML) {
                    body = formatXml(body);
                }
            } else {
                StringBuilder sb = new StringBuilder();
                for (int i = 0, len = contents.length; i < len; ++i) {
                    Object content = contents[i];
                    sb.append(ARGS)
                            .append("[")
                            .append(i)
                            .append("]")
                            .append(" = ")
                            .append(content == null ? NULL : content.toString())
                            .append(LINE_SEP);
                }
                body = sb.toString();
            }
        }
        String msg = head + body;
        if (sLogBorderSwitch) {
            StringBuilder sb = new StringBuilder();
            String[] lines = msg.split(LINE_SEP);
            for (String line : lines) {
                sb.append(LEFT_BORDER).append(line).append(LINE_SEP);
            }
            msg = sb.toString();
        }
        return new String[]{tag, msg};
    }

    private static String formatJson(String json) {
        try {
            if (json.startsWith("{")) {
                json = new JSONObject(json).toString(4);
            } else if (json.startsWith("[")) {
                json = new JSONArray(json).toString(4);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return json;
    }

    private static String formatXml(String xml) {
        try {
            Source xmlInput = new StreamSource(new StringReader(xml));
            StreamResult xmlOutput = new StreamResult(new StringWriter());
            Transformer transformer = TransformerFactory.newInstance().newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
            transformer.transform(xmlInput, xmlOutput);
            xml = xmlOutput.getWriter().toString().replaceFirst(">", ">" + LINE_SEP);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return xml;
    }

    private static void printLog(int type, String tag, String msg) {
        if (sLogBorderSwitch) print(type, tag, TOP_BORDER);
        int len = msg.length();
        int countOfSub = len / MAX_LEN;
        if (countOfSub > 0) {
            print(type, tag, msg.substring(0, MAX_LEN));
            String sub;
            int index = MAX_LEN;
            for (int i = 1; i < countOfSub; i++) {
                sub = msg.substring(index, index + MAX_LEN);
                print(type, tag, sLogBorderSwitch ? LEFT_BORDER + sub : sub);
                index += MAX_LEN;
            }
            sub = msg.substring(index, len);
            print(type, tag, sLogBorderSwitch ? LEFT_BORDER + sub : sub);
        } else {
            print(type, tag, msg);
        }
        if (sLogBorderSwitch) print(type, tag, BOTTOM_BORDER);
    }

    private static void print(final int type, final String tag, String msg) {
        switch (type) {
            case V:
                Log.v(tag, msg);
                break;
            case D:
                Log.d(tag, msg);
                break;
            case I:
                Log.i(tag, msg);
                break;
            case W:
                Log.w(tag, msg);
                break;
            case E:
                Log.e(tag, msg);
                break;
            case A:
                Log.wtf(tag, msg);
                break;
        }
    }

    private static void print2File(final String tag, final String msg) {
        Date now = new Date(System.currentTimeMillis());
        String format = FORMAT.format(now);
        String date = format.substring(0, 5);
        String time = format.substring(6);
        final String fullPath = (dir == null ? defaultDir : dir) + date + ".txt";
        if (!createOrExistsFile(fullPath)) {
            Log.e(tag, "log to " + fullPath + " failed!");
            return;
        }
        StringBuilder sb = new StringBuilder();
        if (sLogBorderSwitch) {
            sb.append(TOP_BORDER).append(LINE_SEP);
            sb.append(LEFT_BORDER)
                    .append(time)
                    .append(tag)
                    .append(LINE_SEP)
                    .append(msg);
            sb.append(BOTTOM_BORDER).append(LINE_SEP);
        } else {
            sb.append(time)
                    .append(tag)
                    .append(LINE_SEP)
                    .append(msg)
                    .append(LINE_SEP);
        }
        sb.append(LINE_SEP);
        final String dateLogContent = sb.toString();
        if (executor == null) {
            executor = Executors.newSingleThreadExecutor();
        }
        executor.execute(new Runnable() {
            @Override
            public void run() {
                BufferedWriter bw = null;
                try {
                    bw = new BufferedWriter(new FileWriter(fullPath, true));
                    bw.write(dateLogContent);
                    Log.d(tag, "log to " + fullPath + " success!");
                } catch (IOException e) {
                    e.printStackTrace();
                    Log.e(tag, "log to " + fullPath + " failed!");
                } finally {
                    try {
                        if (bw != null) {
                            bw.close();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        });
    }

    private static boolean createOrExistsFile(String filePath) {
        File file = new File(filePath);
        if (file.exists()) return file.isFile();
        if (!createOrExistsDir(file.getParentFile())) return false;
        try {
            return file.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
    }

    private static boolean createOrExistsDir(File file) {
        return file != null && (file.exists() ? file.isDirectory() : file.mkdirs());
    }

    private static boolean isSpace(String s) {
        if (s == null) return true;
        for (int i = 0, len = s.length(); i < len; ++i) {
            if (!Character.isWhitespace(s.charAt(i))) {
                return false;
            }
        }
        return true;
    }
}

以上步骤就完成了一个可以随时关闭或打开的log日志了

调用时和log的调用方法一样