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http://www.ruanyifeng.com/blog/2015/12/git-cheat-sheet.html - 入门文档
https://git-scm.com/book/zh/v2 - 官方推荐阅读《Pro Git》

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/**
 * Copyright (C) 2009-2010 Yichuan, Fuchun All rights reserved.
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software

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 /**
     * 从Url中获取Bitmap
     *
     * @param url
     * @return
     */
    private Bitmap getBitmapFormUrl(String url) {
        Bitmap bitmap = null;
        HttpURLConnection con = null;
        try {

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    public void setRightIconDefault(int drawableId){
        Drawable drawable = ContextCompat.getDrawable(mContext, drawableId);
        drawable.clearColorFilter();
        drawable.setColorFilter(selectColor, PorterDuff.Mode.SRC_ATOP);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            rightIcon.setBackground(drawable);
        }
        else
        {

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    public static void getViewSize1(View view) {

        int width = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);

        int height = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);

        view.measure(width, height);

        int height1 = view.getMeasuredHeight();

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    private static class HomeBtnBroadcastReceiver1 extends BroadcastReceiver {
        private String action;
        final String SYSTEM_HOME_KEY;
        final String SYSTEM_RECENT_APPS;

        private HomeBtnBroadcastReceiver1() {
            this.action = null;
            this.SYSTEM_HOME_KEY = "homekey";
            this.SYSTEM_RECENT_APPS = "recentapps";
        }

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    static class ScreenObserver {
        private Context mContext;
        private TrackingIO.ScreenObserver.ScreenBroadcastReceiver mScreenReceiver;
        private TrackingIO.ScreenStateListener mScreenStateListener;

        public ScreenObserver(Context context) {
            this.mContext = context;
            this.mScreenReceiver = new TrackingIO.ScreenObserver.ScreenBroadcastReceiver((TrackingIO.ScreenObserver.ScreenBroadcastReceiver)null);
        }

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The Joel Test

https://www.joelonsoftware.com/2000/08/09/the-joel-test-12-steps-to-better-code/

• Do you use source control?

是否使用源码控制工具 - 使用Git,控制代码避免事故

• Can you make a build in one step?

是否能够快捷的一步构建 - 使用脚本、快捷的构建节约时间珍惜生命

• Do you make daily builds?

是否每天构建 - 安全第一，保证库最新

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//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//


import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;

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import java.net.NetworkInterface;  
import java.util.Collections;  
import java.util.List;  
  
/**  
 * 获取Mac地址  
 */  
public class MacUtils {  
  
    public static String getMacAddr() {