Android 执行Adb shell 命令大多需要root权限，Android自带的Runtime. getRuntime().exec（）容易出错，在网上找到了一个执行adb shell命令的类
代码如下：
/**检查手机是否存在root权限，发送一些消息*/
package com.dx.superbar.util;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import android.content.Context;
public class RootContext
{
private static RootContext instance = null;
private static Object mLock = new Object();
String mShell;
OutputStream o;
Process p;
private RootContext(String cmd) throws Exception
{
this.mShell = cmd;
init();
}
public static RootContext getInstance()
{
if (instance != null)
{
return instance;
}
synchronized (mLock)
{
try
{
instance = new RootContext("su");
}
catch (Exception e)
{
while (true)
try
{
instance = new RootContext("/system/xbin/su");
}
catch (Exception e2)
{
try
{
instance = new RootContext("/system/bin/su");
}
catch (Exception e3)
{
e3.printStackTrace();
}
}
}
return instance;
}
}
private void init() throws Exception
{
if ((this.p != null) && (this.o != null))
{
this.o.flush();
this.o.close();
this.p.destroy();
}
this.p = Runtime.getRuntime().exec(this.mShell);
this.o = this.p.getOutputStream();
system("LD_LIBRARY_PATH=/vendor/lib:/system/lib ");
}
private void system(String cmd)
{
try
{
this.o.write((cmd + "\n").getBytes("ASCII"));
return;
}
catch (Exception e)
{
while (true)
try
{
init();
}
catch (Exception e1)
{
e1.printStackTrace();
}
}
}
public void runCommand(String cmd)
{
system(cmd);
}
/**
* 判断是否已经root了
* */
public static boolean hasRootAccess(Context ctx)
{
final StringBuilder res = new StringBuilder();
try
{
if (runCommandAsRoot(ctx, "exit 0", res) == 0)
return true;
}
catch (Exception e)
{
}
return false;
}
/**
* 以root的权限运行命令
* */
public static int runCommandAsRoot(Context ctx, String script,
StringBuilder res)
{
final File file = new File(ctx.getCacheDir(), "secopt.sh");
final ScriptRunner runner = new ScriptRunner(file, script, res);
runner.start();
try
{
runner.join(40000);
if (runner.isAlive())
{
runner.interrupt();
runner.join(150);
runner.destroy();
runner.join(50);
}
}
catch (InterruptedException ex)
{
}
return runner.exitcode;
}
private static final class ScriptRunner extends Thread
{
private final File file;
private final String script;
private final StringBuilder res;
public int exitcode = -1;
private Process exec;
public ScriptRunner(File file, String script, StringBuilder res)
{
this.file = file;
this.script = script;
this.res = res;
}
@Override
public void run()
{
try
{
file.createNewFile();
final String abspath = file.getAbsolutePath();
Runtime.getRuntime().exec("chmod 777 " + abspath).waitFor();
final OutputStreamWriter out = new OutputStreamWriter(
new FileOutputStream(file));
if (new File("/system/bin/sh").exists())
{
out.write("#!/system/bin/sh\n");
}
out.write(script);
if (!script.endsWith("\n"))
out.write("\n");
out.write("exit\n");
out.flush();
out.close();
exec = Runtime.getRuntime().exec("su");
DataOutputStream os = new DataOutputStream(
exec.getOutputStream());
os.writeBytes(abspath);
os.flush();
os.close();
InputStreamReader r = new InputStreamReader(
exec.getInputStream());
final char buf[] = new char[1024];
int read = 0;
while ((read = r.read(buf)) != -1)
{
if (res != null)
res.append(buf, 0, read);
}
r = new InputStreamReader(exec.getErrorStream());
read = 0;
while ((read = r.read(buf)) != -1)
{
if (res != null)
res.append(buf, 0, read);
}
if (exec != null)
this.exitcode = exec.waitFor();
}
catch (InterruptedException ex)
{
if (res != null)
res.append("\nOperation timed-out");
}
catch (Exception ex)
{
if (res != null)
res.append("\n" + ex);
}
finally
{
destroy();
}
}
public synchronized void destroy()
{
if (exec != null)
exec.destroy();
exec = null;
}
}
}