[Java][Android][Process] Process 创建+控制+分析 经验浅谈

无论是Android亦或者Java中或多或少需要调用底层的一些命令，执行一些参数；

此时我们需要用到Java的Process来创建一个子进程，之所以是子进程是因为此进程依赖于发起创建请求的进程，如果发起者被Kill那个子进程也将Kill。

对于Process相信使用过的朋友一定不会陌生，它具有如下特点：

1.创建简单 

2.控制难 

3.容易导致无法创建子进程 

4.如果是多线程那么很有可能造成内存溢出

以上现象如果你只是偶尔使用一次，创建一个进程或许你什么都没有感觉到，但是如果你使用了多线程，进行了大量的创建，以上问题你都会遇到。

相关：[Android] ProcessBuilder与Runtime.getRuntime().exec分别创建进程的区别，[Android] [Java] 分享 Process 执行命令行封装类

这两个星期一直在研究上面的问题，我要做的软件是在Android中进行TraceRoute，由于手机不可能完全Root所以不能采用JNI来发送ICMP请求的方式，最终只能使用创建进程方式进行；具体实现思路是：使用PING命令来PING百度等地址，在PING命令中加入TTL，得到每一次的IP地址，当IP地址与目标IP地址符合时退出，并且还需要单独PING一次每一跳的延迟和丢包。

单线程：PING 百度 TTL=1 =》 得到IP，PING IP 得到延迟丢包，改变TTL，进行下一次PING，直到所得到的IP与目标（百度）一样时停止。按照上面的思路一次需要创建两个子进程，一般到百度时TTL大约为12跳左右，所以就是2*12=24个子进程；如果是在单线程下简单明了，但是速度慢，整个过程大约需要1分钟左右。

多线程：同时发起3个线程进行3跳测试TTL=（1，2，3），测试完成后测试下一批数据TTL=（4，5，6），如果也是12跳的话，那么也是24个子进程，但是整体耗时将会为1/3.可见此时效率较高。

但是多线程需要考虑的是线程的同步问题，以及得到数据后的写入问题，这些赞不谈，只谈进程问题。经过我的测试假如现在测试100个网站的TraceRoute数据，在上层控制一次测试4个网站，底层实现并发3个线程，此时在一定时间内将会同时存在3*4个进程。按照平均每个网站12跳来算：12*2*100=240个子进程，需要的子线程为12*100=120个。

这个时候问题来了，假如现在程序子进程不正常了，遇到了一个一定的问题导致进程无法执行完成，此时你的现象是：一个子进程卡住，随后创建的所有子进程都卡住。假如最上层线程做了任务时间限制，那么到时间后将会尝试销毁，但是你会发现无法销毁，所持有的线程也不会销毁。但是上层以为销毁掉了，然后继续进行下一批的数据测试，此时你的线程数量会逐渐增加，如果100任务下来你的线程或许会达到3*4*100=1200如果有前期没有这样的情况那个就是一半：600个线程左右，如果后期还有任务将会继续增加但是却永远不会销毁，但是我们知道JVM的内存是有限的，所以此时将会出现内存溢出。

以上就是我遇到的问题，我最先改为了等待线程完全返回后再进行下一批数据测试，此时内存溢出是解决了，但是任务却一直卡住在哪里了，永远也不走。我就在想要解决这一的问题需要解决根本上的问题才行，经过研究我发现在程序创建了子进程后JVM将会创建一个子进程管理线程：“ProcessManager”：

正常情况下该线程状态为Native，但是如果创建大量子进程后有可能会出现此线程为Monitor状态，过一段时间后所有创建子进程的线程状态也将会变为Monitor状态，然后将一直死锁，后面创建线程也是继续死锁，无法继续。

通过查看ProcessManager源码发现，其中启动了一个线程用于监听子进程状态，同时管理子进程，比如输出消息以及关闭子进程等操作，具体如下：

/** * Copyright (C) 2007 The Android Open Source Project * * Licensed 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 * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package java.lang;import java.io.File;import java.io.FileDescriptor;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.lang.ref.ReferenceQueue;import java.lang.ref.WeakReference;import java.util.HashMap;import java.util.Map;import java.util.Arrays;import java.util.logging.Logger;import java.util.logging.Level;/*** * Manages child processes. * * <p>Harmony's native implementation (for comparison purposes): * http://tinyurl.com/3ytwuq */final class ProcessManager {    /***     * constant communicated from native code indicating that a     * child died, but it was unable to determine the status     */    private static final int WAIT_STATUS_UNKNOWN = -1;    /***     * constant communicated from native code indicating that there     * are currently no children to wait for     */    private static final int WAIT_STATUS_NO_CHILDREN = -2;    /***     * constant communicated from native code indicating that a wait()     * call returned -1 and set an undocumented (and hence unexpected) errno     */    private static final int WAIT_STATUS_STRANGE_ERRNO = -3;    /***     * Initializes native static state.     */    static native void staticInitialize();    static {        staticInitialize();    }    /***     * Map from pid to Process. We keep weak references to the Process objects     * and clean up the entries when no more external references are left. The     * process objects themselves don't require much memory, but file     * descriptors (associated with stdin/out/err in this case) can be     * a scarce resource.     */    private final Map<Integer, ProcessReference> processReferences            = new HashMap<Integer, ProcessReference>();    /*** Keeps track of garbage-collected Processes. */    private final ProcessReferenceQueue referenceQueue            = new ProcessReferenceQueue();    private ProcessManager() {        // Spawn a thread to listen for signals from child processes.        Thread processThread = new Thread(ProcessManager.class.getName()) {            @Override            public void run() {                watchChildren();            }        };        processThread.setDaemon(true);        processThread.start();    }    /***     * Kills the process with the given ID.     *     * @parm pid ID of process to kill     */    private static native void kill(int pid) throws IOException;    /***     * Cleans up after garbage collected processes. Requires the lock on the     * map.     */    void cleanUp() {        ProcessReference reference;        while ((reference = referenceQueue.poll()) != null) {            synchronized (processReferences) {                processReferences.remove(reference.processId);            }        }    }    /***     * Listens for signals from processes and calls back to     * {@link #onExit(int,int)}.     */    native void watchChildren();    /***     * Called by {@link #watchChildren()} when a child process exits.     *     * @param pid ID of process that exited     * @param exitValue value the process returned upon exit     */    void onExit(int pid, int exitValue) {        ProcessReference processReference = null;        synchronized (processReferences) {            cleanUp();            if (pid >= 0) {                processReference = processReferences.remove(pid);            } else if (exitValue == WAIT_STATUS_NO_CHILDREN) {                if (processReferences.isEmpty()) {                    /**                     * There are no eligible children; wait for one to be                     * added. The wait() will return due to the                     * notifyAll() call below.                     */                    try {                        processReferences.wait();                    } catch (InterruptedException ex) {                        // This should never happen.                        throw new AssertionError("unexpected interrupt");                    }                } else {                    /**                     * A new child was spawned just before we entered                     * the synchronized block. We can just fall through                     * without doing anything special and land back in                     * the native wait().                     */                }            } else {                // Something weird is happening; abort!                throw new AssertionError("unexpected wait() behavior");            }        }        if (processReference != null) {            ProcessImpl process = processReference.get();            if (process != null) {                process.setExitValue(exitValue);            }        }    }    /***     * Executes a native process. Fills in in, out, and err and returns the     * new process ID upon success.     */    static native int exec(String[] command, String[] environment,            String workingDirectory, FileDescriptor in, FileDescriptor out,            FileDescriptor err, boolean redirectErrorStream) throws IOException;    /***     * Executes a process and returns an object representing it.     */    Process exec(String[] taintedCommand, String[] taintedEnvironment, File workingDirectory,            boolean redirectErrorStream) throws IOException {        // Make sure we throw the same exceptions as the RI.        if (taintedCommand == null) {            throw new NullPointerException();        }        if (taintedCommand.length == 0) {            throw new IndexOutOfBoundsException();        }        // Handle security and safety by copying mutable inputs and checking them.        String[] command = taintedCommand.clone();        String[] environment = taintedEnvironment != null ? taintedEnvironment.clone() : null;        SecurityManager securityManager = System.getSecurityManager();        if (securityManager != null) {            securityManager.checkExec(command[0]);        }        // Check we're not passing null Strings to the native exec.        for (String arg : command) {            if (arg == null) {                throw new NullPointerException();            }        }        // The environment is allowed to be null or empty, but no element may be null.        if (environment != null) {            for (String env : environment) {                if (env == null) {                    throw new NullPointerException();                }            }        }        FileDescriptor in = new FileDescriptor();        FileDescriptor out = new FileDescriptor();        FileDescriptor err = new FileDescriptor();        String workingPath = (workingDirectory == null)                ? null                : workingDirectory.getPath();        // Ensure onExit() doesn't access the process map before we add our        // entry.        synchronized (processReferences) {            int pid;            try {                pid = exec(command, environment, workingPath, in, out, err, redirectErrorStream);            } catch (IOException e) {                IOException wrapper = new IOException("Error running exec()."                         + " Command: " + Arrays.toString(command)                        + " Working Directory: " + workingDirectory                        + " Environment: " + Arrays.toString(environment));                wrapper.initCause(e);                throw wrapper;            }            ProcessImpl process = new ProcessImpl(pid, in, out, err);            ProcessReference processReference                    = new ProcessReference(process, referenceQueue);            processReferences.put(pid, processReference);            /**             * This will wake up the child monitor thread in case there             * weren't previously any children to wait on.             */            processReferences.notifyAll();            return process;        }    }    static class ProcessImpl extends Process {        /*** Process ID. */        final int id;        final InputStream errorStream;        /*** Reads output from process. */        final InputStream inputStream;        /*** Sends output to process. */        final OutputStream outputStream;        /*** The process's exit value. */        Integer exitValue = null;        final Object exitValueMutex = new Object();        ProcessImpl(int id, FileDescriptor in, FileDescriptor out,                FileDescriptor err) {            this.id = id;            this.errorStream = new ProcessInputStream(err);            this.inputStream = new ProcessInputStream(in);            this.outputStream = new ProcessOutputStream(out);        }        public void destroy() {            try {                kill(this.id);            } catch (IOException e) {                Logger.getLogger(Runtime.class.getName()).log(Level.FINE,                        "Failed to destroy process " + id + ".", e);            }        }        public int exitValue() {            synchronized (exitValueMutex) {                if (exitValue == null) {                    throw new IllegalThreadStateException(                            "Process has not yet terminated.");                }                return exitValue;            }        }        public InputStream getErrorStream() {            return this.errorStream;        }        public InputStream getInputStream() {            return this.inputStream;        }        public OutputStream getOutputStream() {            return this.outputStream;        }        public int waitFor() throws InterruptedException {            synchronized (exitValueMutex) {                while (exitValue == null) {                    exitValueMutex.wait();                }                return exitValue;            }        }        void setExitValue(int exitValue) {            synchronized (exitValueMutex) {                this.exitValue = exitValue;                exitValueMutex.notifyAll();            }        }        @Override        public String toString() {            return "Process[id=" + id + "]";          }    }    static class ProcessReference extends WeakReference<ProcessImpl> {        final int processId;        public ProcessReference(ProcessImpl referent,                ProcessReferenceQueue referenceQueue) {            super(referent, referenceQueue);            this.processId = referent.id;        }    }    static class ProcessReferenceQueue extends ReferenceQueue<ProcessImpl> {        @Override        public ProcessReference poll() {            // Why couldn't they get the generics right on ReferenceQueue? :(            Object reference = super.poll();            return (ProcessReference) reference;        }    }    static final ProcessManager instance = new ProcessManager();    /*** Gets the process manager. */    static ProcessManager getInstance() {        return instance;    }    /*** Automatically closes fd when collected. */    private static class ProcessInputStream extends FileInputStream {        private FileDescriptor fd;        private ProcessInputStream(FileDescriptor fd) {            super(fd);            this.fd = fd;        }        @Override        public void close() throws IOException {            try {                super.close();            } finally {                synchronized (this) {                    if (fd != null && fd.valid()) {                        try {                            ProcessManager.close(fd);                        } finally {                            fd = null;                        }                    }                }            }        }    }    /*** Automatically closes fd when collected. */    private static class ProcessOutputStream extends FileOutputStream {        private FileDescriptor fd;        private ProcessOutputStream(FileDescriptor fd) {            super(fd);            this.fd = fd;        }        @Override        public void close() throws IOException {            try {                super.close();            } finally {                synchronized (this) {                    if (fd != null && fd.valid()) {                        try {                            ProcessManager.close(fd);                        } finally {                            fd = null;                        }                    }                }            }        }    }    /*** Closes the given file descriptor. */    private static native void close(FileDescriptor fd) throws IOException;}

在其中有一个“native void watchChildren();”方法，此方法为线程主方法，具体实现可以看看JNI，在其中回调了方法：“void onExit(int pid, int exitValue);” 在方法中：

void onExit(int pid, int exitValue) {        ProcessReference processReference = null;        synchronized (processReferences) {            cleanUp();            if (pid >= 0) {                processReference = processReferences.remove(pid);            } else if (exitValue == WAIT_STATUS_NO_CHILDREN) {                if (processReferences.isEmpty()) {                    /**                     * There are no eligible children; wait for one to be                     * added. The wait() will return due to the                     * notifyAll() call below.                     */                    try {                        processReferences.wait();                    } catch (InterruptedException ex) {                        // This should never happen.                        throw new AssertionError("unexpected interrupt");                    }                } else {                    /**                     * A new child was spawned just before we entered                     * the synchronized block. We can just fall through                     * without doing anything special and land back in                     * the native wait().                     */                }            } else {                // Something weird is happening; abort!                throw new AssertionError("unexpected wait() behavior");            }        }        if (processReference != null) {            ProcessImpl process = processReference.get();            if (process != null) {                process.setExitValue(exitValue);            }        }    }

此方法作用是删除子进程队列中子进程同时通知子进程ProcessImpl已完成。

但是在方法：“watchChildren（）”中如果出现System.in缓冲期满的情况那么进程将无法正常结束，它将一直等待缓冲区有空间存在，而缓冲区又是公共区间，如果一个出现等待那么后续子进程也将全部等待，如果缓冲区无法清空，那么所有子进程将会全部死锁掉。这就是导致子进程卡死的凶手。

知道问题关键点那么就会有人想办法解决，例如：

//...读取数据...process.waitFor();//....再次读取

这样的方式看似很好，但是你有没有想过有些数据无法及时返回，所以在waitfor()之前读取很有可能没有数据导致进行waitfor()等待，这时我们可以看看源码：

        public int waitFor() throws InterruptedException {            synchronized (exitValueMutex) {                while (exitValue == null) {                    exitValueMutex.wait();                }                return exitValue;            }        }

        void setExitValue(int exitValue) {            synchronized (exitValueMutex) {                this.exitValue = exitValue;                exitValueMutex.notifyAll();            }        }

这里可以看见假如没有退出值将会进行等待，直到通知发生，但是通知想要发生必须要靠“ProcessManager”线程来告诉你。但是假如在等待过程中出现了大量的数据，导致System.IN满了，此时“ProcessManager”线程很傻很傻的进入了等待状态中，也将无法进行通知，而这边也就无法往下走，无法到达第二次读取，所以第二次读取就很随机了，在大量数据下第二次读取基本上就是摆设，也就是说无法正常的执行，最终也将导致死锁。

解决办法也很简单，创建线程后我们可以创建一个线程来专门读取信息，直到“ProcessManager”线程通知结束的时候，才退出线程。

首先我们看看Process提供的“exitValue()”方法：

        public int exitValue() {            synchronized (exitValueMutex) {                if (exitValue == null) {                    throw new IllegalThreadStateException(                            "Process has not yet terminated.");                }                return exitValue;            }        }

可见在”exitValue“没有值时将会抛出异常而不会阻塞，所以可以得出：”exitValue()“与”waitfor()“都可以用于判断线程是否完成，但是一个是阻塞的一个是不阻塞的方法，在线程中当然使用不阻塞的来完成我们的工作：

    /**     * 实例化一个ProcessModel     *     * @param process Process     */    private ProcessModel(Process process) {        //init        this.process = process;        //get        out = process.getOutputStream();        in = process.getInputStream();        err = process.getErrorStream();        //in        if (in != null) {            isInReader = new InputStreamReader(in);            bInReader = new BufferedReader(isInReader, BUFFER_LENGTH);        }        sbReader = new StringBuilder();        //start read thread        readThread();    }....................    //读取结果    private void read() {        String str;        //read In        try {            while ((str = bInReader.readLine()) != null) {                sbReader.append(str);                sbReader.append(BREAK_LINE);            }        } catch (Exception e) {            e.printStackTrace();            Logs.e(TAG, e.getMessage());        }    }    /**     * 启动线程进行异步读取结果     */    private void readThread() {        Thread thread = new Thread(new Runnable() {            @Override            public void run() {                //                while (true) {                    try {                        process.exitValue();                        //read last                        read();                        break;                    } catch (IllegalThreadStateException e) {                        read();                    }                    StaticFunction.sleepIgnoreInterrupt(300);                }                //read end                int len;                if (in != null) {                    try {                        while ((len = in.read(BUFFER)) > 0) {                            Logs.d(TAG, String.valueOf(len));                        }                    } catch (IOException e) {                        e.printStackTrace();                        Logs.e(TAG, e.getMessage());                    }                }                //close                close();                //done                isDone = true;            }        });        thread.setName("DroidTestAgent.Test.TestModel.ProcessModel:ReadThread");        thread.setDaemon(true);        thread.start();    }

当创建进程后把进程丢进我建立的类中实例化为一个进程管理类，随后启动线程，线程执行中调用进程的”exitValue()“，如果异常就进入读取数据，直到不异常时再次读取一次最后数据，随后退出循环，退出后还读取了一次底层的数据（这个其实可以不用要,纯属心理作用！）。最后写入完成标记。其中”StaticFunction.sleepIgnoreInterrupt(300);“是我写的静态方法用于休眠等待而已，也就是Sleep，只不过加入了try catch。

当然光是读取IN流是不行的，还有Error流，这个时候就需要两个线程来完成，一个也行。不过我为了简单采用了：ProcessBuilder类创建进程并重定向了错误流到IN流中，这样简化了操作。

而使用ProcessBuilder类需要注意的是同一个ProcessBuilder实例创建子进程的时候是需要进行线程同步操作的，因为如果并发操作将会导致进程参数错误等现象发生，所以建议加上线程互斥来实现，但是不建议重复创建ProcessBuilder实例，创建那么多实例，何不把所有子进程放在一个ProcessBuilder实例里边。减少内存消耗啊，手机伤不起啊。

有必要提出的是，当线程判断结束的时候，也就是退出值（exitvalue）有值得时候此时其实在”ProcessManager“线程中已经杀掉了进程了，此时在进程中其实没有此进程了，有的也就是执行后的数据流而已。所以正常结束情况下无需自己调用”destroy()“方法，调用后将会触发异常，说没有找到此进程。

        public void destroy() {            try {                kill(this.id);            } catch (IOException e) {                Logger.getLogger(Runtime.class.getName()).log(Level.FINE,                        "Failed to destroy process " + id + ".", e);            }        }

终于讲完了，累啊；

最后给大家分享我自己弄得一个类（ProcessModel），大家喜欢就直接拿去，如果有好的建议希望大家提出来：

import com.droidtestagent.journal.Logs;import com.droidtestagent.util.StaticFunction;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;/** * Create By Qiujuer * 2014-08-05 * <p/> * 执行命令行语句进程管理封装 */public class ProcessModel {    private static final String TAG = "ProcessModel";    //换行符    private static final String BREAK_LINE;    //错误缓冲    private static final byte[] BUFFER;    //缓冲区大小    private static final int BUFFER_LENGTH;    //创建进程时需要互斥进行    private static final Lock lock = new ReentrantLock();    //ProcessBuilder    private static final ProcessBuilder prc;    final private Process process;    final private InputStream in;    final private InputStream err;    final private OutputStream out;    final private StringBuilder sbReader;    private BufferedReader bInReader = null;    private InputStreamReader isInReader = null;    private boolean isDone;    /**     * 静态变量初始化     */    static {        BREAK_LINE = "\n";        BUFFER_LENGTH = 128;        BUFFER = new byte[BUFFER_LENGTH];        prc = new ProcessBuilder();    }    /**     * 实例化一个ProcessModel     *     * @param process Process     */    private ProcessModel(Process process) {        //init        this.process = process;        //get        out = process.getOutputStream();        in = process.getInputStream();        err = process.getErrorStream();        //in        if (in != null) {            isInReader = new InputStreamReader(in);            bInReader = new BufferedReader(isInReader, BUFFER_LENGTH);        }        sbReader = new StringBuilder();        //start read thread        readThread();    }    /**     * 执行命令     *     * @param params 命令参数 eg: "/system/bin/ping", "-c", "4", "-s", "100","www.qiujuer.net"     */    public static ProcessModel create(String... params) {        Process process = null;        try {            lock.lock();            process = prc.command(params)                    .redirectErrorStream(true)                    .start();        } catch (IOException e) {            e.printStackTrace();        } finally {            //sleep 100            StaticFunction.sleepIgnoreInterrupt(100);            lock.unlock();        }        if (process == null)            return null;        return new ProcessModel(process);    }    /**     * 通过Android底层实现进程关闭     *     * @param process 进程     */    public static void kill(Process process) {        int pid = getProcessId(process);        if (pid != 0) {            try {                android.os.Process.killProcess(pid);            } catch (Exception e) {                try {                    process.destroy();                } catch (Exception ex) {                    //ex.printStackTrace();                }            }        }    }    /**     * 获取进程的ID     *     * @param process 进程     * @return id     */    public static int getProcessId(Process process) {        String str = process.toString();        try {            int i = str.indexOf("=") + 1;            int j = str.indexOf("]");            str = str.substring(i, j);            return Integer.parseInt(str);        } catch (Exception e) {            return 0;        }    }    //读取结果    private void read() {        String str;        //read In        try {            while ((str = bInReader.readLine()) != null) {                sbReader.append(str);                sbReader.append(BREAK_LINE);            }        } catch (Exception e) {            e.printStackTrace();            Logs.e(TAG, e.getMessage());        }    }    /**     * 启动线程进行异步读取结果     */    private void readThread() {        Thread thread = new Thread(new Runnable() {            @Override            public void run() {                //while to end                while (true) {                    try {                        process.exitValue();                        //read last                        read();                        break;                    } catch (IllegalThreadStateException e) {                        read();                    }                    StaticFunction.sleepIgnoreInterrupt(300);                }                //read end                int len;                if (in != null) {                    try {                        while ((len = in.read(BUFFER)) > 0) {                            Logs.d(TAG, String.valueOf(len));                        }                    } catch (IOException e) {                        e.printStackTrace();                        Logs.e(TAG, e.getMessage());                    }                }                //close                close();                //done                isDone = true;            }        });        thread.setName("DroidTestAgent.Test.TestModel.ProcessModel:ReadThread");        thread.setDaemon(true);        thread.start();    }    /**     * 获取执行结果     *     * @return 结果     */    public String getResult() {        //waite process setValue        try {            process.waitFor();        } catch (Exception e) {            e.printStackTrace();            Logs.e(TAG, e.getMessage());        }        //until startRead en        while (true) {            if (isDone)                break;            StaticFunction.sleepIgnoreInterrupt(100);        }        //return        if (sbReader.length() == 0)            return null;        else            return sbReader.toString();    }    /**     * 关闭所有流     */    private void close() {        //close out        if (out != null) {            try {                out.close();            } catch (IOException e) {                e.printStackTrace();            }        }        //err        if (err != null) {            try {                err.close();            } catch (IOException e) {                e.printStackTrace();            }        }        //in        if (in != null) {            try {                in.close();            } catch (IOException e) {                e.printStackTrace();            }        }        if (isInReader != null) {            try {                isInReader.close();            } catch (IOException e) {                e.printStackTrace();            }        }        if (bInReader != null) {            try {                bInReader.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }    /**     * 销毁     */    public void destroy() {        //process        try {            process.destroy();        } catch (Exception ex) {            kill(process);        }    }}

想了想还是把代码托管到了GitHub上，方便以后分享其他的代码。
地址：Android Utils

非常欢迎大家找出不足发表问题。