Android 在Android代码中执行命令行
转自 https://www.cnblogs.com/lipeineng/p/6078859.html
1.路径最好不要是自己拼写的路径/mnt/shell/emulated/0/wifidog.conf
最好是通过方法获取的路径，不然可能导致命令无效 （挂载点的原因）
public static final String SDCARD_ROOT=Environment.getExternalStorageDirectory().getAbsolutePath();
public static final String AAA_PATH=SDCARD_ROOT+"/wifidog.conf";
package com.example.videotest.utils;
import android.os.Environment;
import android.util.Log;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import static java.lang.Runtime.getRuntime;
/**
* 执行命令的类
* Created by Kappa
*/
public class ExeCommand {
//shell进程
private Process process;
//对应进程的3个流
private BufferedReader successResult;
private BufferedReader errorResult;
private DataOutputStream os;
//是否同步，true：run会一直阻塞至完成或超时。false：run会立刻返回
private boolean bSynchronous;
//表示shell进程是否还在运行
private boolean bRunning = false;
//同步锁
ReadWriteLock lock = new ReentrantReadWriteLock();
//保存执行结果
private StringBuffer result = new StringBuffer();
/**
* 构造函数
*
* @param synchronous true：同步，false：异步
*/
public ExeCommand(boolean synchronous) {
bSynchronous = synchronous;
}
/**
* 默认构造函数，默认是同步执行
*/
public ExeCommand() {
bSynchronous = true;
}
/**
* 还没开始执行，和已经执行完成 这两种情况都返回false
*
* @return 是否正在执行
*/
public boolean isRunning() {
return bRunning;
}
/**
* @return 返回执行结果
*/
public String getResult() {
Lock readLock = lock.readLock();
readLock.lock();
try {
Log.i("auto", "getResult");
return new String(result);
} finally {
readLock.unlock();
}
}
/**
* 执行命令
*
* @param command eg: cat /sdcard/test.txt
* 路径最好不要是自己拼写的路径，最好是通过方法获取的路径
* example：Environment.getExternalStorageDirectory()
* @param maxTime 最大等待时间 (ms)
* @return this
*/
public ExeCommand run(String command, final int maxTime) {
Log.i("auto", "run command:" + command + ",maxtime:" + maxTime);
if (command == null || command.length() == 0) {
return this;
}
try {
process = getRuntime().exec("sh");//看情况可能是su
} catch (Exception e) {
return this;
}
bRunning = true;
successResult = new BufferedReader(new InputStreamReader(process.getInputStream()));
errorResult = new BufferedReader(new InputStreamReader(process.getErrorStream()));
os = new DataOutputStream(process.getOutputStream());
try {
//向sh写入要执行的命令
os.write(command.getBytes());
os.writeBytes("\n");
os.flush();
os.writeBytes("exit\n");
os.flush();
os.close();
//如果等待时间设置为非正，就不开启超时关闭功能
if (maxTime > 0) {
//超时就关闭进程
new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(maxTime);
} catch (Exception e) {
}
try {
int ret = process.exitValue();
Log.i("auto", "exitValue Stream over"+ret);
} catch (IllegalThreadStateException e) {
Log.i("auto", "take maxTime,forced to destroy process");
process.destroy();
}
}
}).start();
}
//开一个线程来处理input流
final Thread t1 = new Thread(new Runnable() {
@Override
public void run() {
String line;
Lock writeLock = lock.writeLock();
try {
while ((line = successResult.readLine()) != null) {
line += "\n";
writeLock.lock();
result.append(line);
writeLock.unlock();
}
} catch (Exception e) {
Log.i("auto", "read InputStream exception:" + e.toString());
} finally {
try {
successResult.close();
Log.i("auto", "read InputStream over");
} catch (Exception e) {
Log.i("auto", "close InputStream exception:" + e.toString());
}
}
}
});
t1.start();
//开一个线程来处理error流
final Thread t2 = new Thread(new Runnable() {
@Override
public void run() {
String line;
Lock writeLock = lock.writeLock();
try {
while ((line = errorResult.readLine()) != null) {
line += "\n";
writeLock.lock();
result.append(line);
writeLock.unlock();
}
} catch (Exception e) {
Log.i("auto", "read ErrorStream exception:" + e.toString());
} finally {
try {
errorResult.close();
Log.i("auto", "read ErrorStream over");
} catch (Exception e) {
Log.i("auto", "read ErrorStream exception:" + e.toString());
}
}
}
});
t2.start();
Thread t3 = new Thread(new Runnable() {
@Override
public void run() {
try {
//等待执行完毕
t1.join();
t2.join();
process.waitFor();
} catch (Exception e) {
} finally {
bRunning = false;
Log.i("auto", "run command process end");
}
}
});
t3.start();
if (bSynchronous) {
Log.i("auto", "run is go to end");
t3.join();
Log.i("auto", "run is end");
}
} catch (Exception e) {
Log.i("auto", "run command process exception:" + e.toString());
}
return this;
}
}讲解一下关键点，首先是启动一个sh进程，当然如果你用的是root的设备，可以使用su。
这个进程包含 input、output、error 三个流，这三个流要处理好，否则可能不能正常结束进程，
另外也存在执行的命令已经结束，但是依然还有input流的情况，也需要处理。
其他请参考代码
使用方式为2种。首先是阻塞方式，这种调用方式会一直阻塞至命令执行完成，返回命令行的输出结果
public static final String SDCARD_ROOT=Environment.getExternalStorageDirectory().getAbsolutePath();
public static final String AAA_PATH=SDCARD_ROOT+"/wifidog.conf";
//读取目标文件（绝对路径）指定内容“#TrustedMACList ”的那一行
String cmd3="sed -n '/#TrustedMACList /,//p' "+AAA_PATH;
String str3 = new ExeCommand().run(cmd3, 10000).getResult();
Log.i("auto", str3+"button3");
Toast.makeText(MainActivity.this, str3,Toast.LENGTH_SHORT).show();LOG 程序执行的顺序
I/auto ( 5542): run command:sed -n '/#TrustedMACList /,//p' /storage/emulated/0/wifidog.conf,maxtime:10000
I/auto ( 5542): run is go to end
I/auto ( 5542): read ErrorStream over
I/auto ( 5542): read InputStream over
I/auto ( 5542): run command process end
I/auto ( 5542): run is end
I/auto ( 5542): getResult
I/auto ( 5542): #TrustedMACList 00:00:C0:1D:F0:0D,00:00:C0:1D:F0:0D,00:00:C0:1D:F0:0D,00:00:C0:1D:F0:0D,00:00:C0:1D:F0:0D,00:00:DE:AD:BE:AF,00:00:C0:1D:F0:0D
I/auto ( 5542):
I/auto ( 5542): button3还有一种是异步方式，这种调用方式会直接返回，之后可以使用 getResult() 获取结果，使用 isRunning() 来判断是否完成，比如
ExeCommand cmd = new ExeCommand(false).run("your cmd", 60000);
while(cmd.isRunning())
{
try {
sleep(1000);
} catch (Exception e) {
}
String buf = cmd.getResult();
//do something
}