LogHelper.java

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/*
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 * Copyright (C) 2014 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.mediabrowserservice.utils;
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import android.util.Log;
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import com.example.android.mediabrowserservice.BuildConfig;
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public class LogHelper {
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    private static final String LOG_PREFIX = "sample_";
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    private static final int LOG_PREFIX_LENGTH = LOG_PREFIX.length();
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    private static final int MAX_LOG_TAG_LENGTH = 23;
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    public static String makeLogTag(String str) {
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        if (str.length() > MAX_LOG_TAG_LENGTH - LOG_PREFIX_LENGTH) {
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            return LOG_PREFIX + str.substring(0, MAX_LOG_TAG_LENGTH - LOG_PREFIX_LENGTH - 1);
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        }
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        return LOG_PREFIX + str;
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    }
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    /**
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     * Don't use this when obfuscating class names!
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     */
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    public static String makeLogTag(Class cls) {
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        return makeLogTag(cls.getSimpleName());
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    }
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    public static void v(String tag, Object... messages) {
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        // Only log VERBOSE if build type is DEBUG
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        if (BuildConfig.DEBUG) {
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            log(tag, Log.VERBOSE, null, messages);
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        }
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    }
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    public static void d(String tag, Object... messages) {
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        // Only log DEBUG if build type is DEBUG
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        if (BuildConfig.DEBUG) {
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            log(tag, Log.DEBUG, null, messages);
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        }
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    }
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    public static void i(String tag, Object... messages) {
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        log(tag, Log.INFO, null, messages);
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    }
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    public static void w(String tag, Object... messages) {
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        log(tag, Log.WARN, null, messages);
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    }
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    public static void w(String tag, Throwable t, Object... messages) {
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        log(tag, Log.WARN, t, messages);
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    }
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    public static void e(String tag, Object... messages) {
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        log(tag, Log.ERROR, null, messages);
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    }
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    public static void e(String tag, Throwable t, Object... messages) {
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        log(tag, Log.ERROR, t, messages);
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    }
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    public static void log(String tag, int level, Throwable t, Object... messages) {
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        if (Log.isLoggable(tag, level)) {
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            String message;
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            if (t == null && messages != null && messages.length == 1) {
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                // handle this common case without the extra cost of creating a stringbuffer:
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                message = messages[0].toString();
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            } else {
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                StringBuilder sb = new StringBuilder();
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                if (messages != null) for (Object m : messages) {
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                    sb.append(m);
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                }
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                if (t != null) {
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                    sb.append("\n").append(Log.getStackTraceString(t));
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                }
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                message = sb.toString();
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            }
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            Log.println(level, tag, message);
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        }
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    }
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}
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2015	2016	2017
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LogHelper.java
