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android java如何执行linux命令

时间:2016-11-30 16:21:20 作者:andy 来源:linux 阅读:

android java如何执行linux命令?android的程序基于java开发,当我们接上调试器,执行adb shell,就可以执行linux命令,下面跟着小编来一起来了解下吧。

android java执行linux命令方法

通常有很多命令可以通过串口终端输入,得到结果,在程序中,通常我们需要得到某些命令的结果,在代码中执行命令,并将结果返回。

有两个类:CommandHelper.java和CommandResult.java 第一个类用于处理命令,第二个则用于返回一个结果

package com.example.task_aidl;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class CommandHelper {

//default time out, in millseconds

public static int DEFAULT_TIMEOUT;

public static final int DEFAULT_INTERVAL = 1000;

public static long START;

public static CommandResult exec(String command) throws IOException, InterruptedException {

Process process = Runtime.getRuntime().exec(command);//创建一个字进程,并保存在process对象中

CommandResult commandResult = wait(process);

if (process != null) {

process.destroy();

}

return commandResult;

}

private static boolean isOverTime() {

return System.currentTimeMillis() - START >= DEFAULT_TIMEOUT;

}

private static CommandResult wait(Process process) throws InterruptedException, IOException {

BufferedReader errorStreamReader = null;

BufferedReader inputStreamReader = null;

try {

errorStreamReader = new BufferedReader(new InputStreamReader(process.getErrorStream()));

inputStreamReader = new BufferedReader(new InputStreamReader(process.getInputStream()));

//timeout control

START = System.currentTimeMillis();

boolean isFinished = false;

for (;;) {

if (isOverTime()) {

CommandResult result = new CommandResult();

result.setExitValue(CommandResult.EXIT_VALUE_TIMEOUT);

result.setOutput("Command process timeout");

return result;

}

if (isFinished) {

CommandResult result = new CommandResult();

result.setExitValue(process.waitFor()); //process.waitFor() 表示 等这条语句执行完后再往下执行

//parse error info

if (errorStreamReader.ready()) {

StringBuilder buffer = new StringBuilder();

String line;

while ((line = errorStreamReader.readLine()) != null) {

buffer.append(line);

}

result.setError(buffer.toString());

}

//parse info

if (inputStreamReader.ready()) {

StringBuilder buffer = new StringBuilder();

String line;

while ((line = inputStreamReader.readLine()) != null) {

buffer.append(line);

}

result.setOutput(buffer.toString());

}

return result;

}

try {

isFinished = true;

process.exitValue();

} catch (IllegalThreadStateException e) {

// process hasn't finished yet

isFinished = false;

Thread.sleep(DEFAULT_INTERVAL);

}

}

} finally {

if (errorStreamReader != null) {

try {

errorStreamReader.close();

} catch (IOException e) {

}

}

if (inputStreamReader != null) {

try {

inputStreamReader.close();

} catch (IOException e) {

}

}

}

}

}

------------------------------------------------------------------------------

package com.example.task_aidl;

public class CommandResult {

public static final int EXIT_VALUE_TIMEOUT=-1;

private String output;

void setOutput(String error) {

output=error;

}

String getOutput(){

return output;

}

int exitValue;

void setExitValue(int value) {

exitValue=value;

}

int getExitValue(){

return exitValue;

}

private String error;

public String getError() {

return error;

}

public void setError(String error) {

this.error = error;

}

}

------------------------------------------------------------

简单的调用: 杀掉一个进程 kill -9 PID

@Override

public String killProc(String PID) throws RemoteException {

// TODO Auto-generated method stub

String cmd = "kill -9 "+PID;

String reply = "";

Log.v("cmd",cmd);

try {

CommandHelper.DEFAULT_TIMEOUT = 5000;

CommandResult result = CommandHelper.exec(cmd);

if (result != null) {

if(result.getError()!=null)

{

Log.v("Output","Error:" + result.getError());

reply = result.getError();

}

if(result.getOutput()!=null)

{

Log.v("Output","Output:" + result.getOutput());

reply = result.getOutput();

}

}

} catch (IOException ex) {

Log.v("Output","IOException:" + ex.getLocalizedMessage());

} catch (InterruptedException ex) {

Log.v("Output","InterruptedException:" + ex.getLocalizedMessage());

}

return reply;

}

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