android怎样在代码里判断系统是否root？在不弹出授权提示前提下

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android怎样在代码里判断系统是否root？在不弹出授权提示前提下5

如题怎样在不弹出授权提示的前提下获知系统是否root
我在网上找了很多都是执行需要root权限的动作然后根据结果来判断但是这样的话就会弹出授权的提示如果用户拒绝授权的话那么判断出来的还是系统没有root
所以我想在不弹出授权提示的前提下用什么方法或者通过检测什么东西来判断手机系统是否被root

Android root

2012年6月08日 11:22

ch331917692
25
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2个答案按时间排序按投票排序

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简单点的，root过的机器必定会安装superuser这个软件，判断这个软件是否安装可以大概了解该机器是否已root。该方法的问题是，没有root也可以装superuser这个软件，不过这么无聊的人不多吧。

2012年7月20日 15:13

dss16694
25
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public static boolean hasRootAccess(Context ctx)
{
final StringBuilder res = new StringBuilder();
try
{
if (runScriptAsRoot(ctx, "exit 0", res) == 0)
return true;
} catch (Exception e) {
}
return false;
}

public static int runScriptAsRoot(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;
}
}

你调用hasRootAccess（）这个方法判断boolean值就可以了