Android 检测是否有ROOT权限

ndroid (linux)很多命令需要root权限才能执行，比如说查看系统目录文件等，如果我们的程序需要用到查看此类文件或执行系统命令，就必须先获取Root权限。

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import android.app.Activity;
import android.os.Bundle;

public class RootActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        DataInputStream stream;
        if(isRooted()){
        try {
            stream = Terminal("ping -c 2 www.pocketdigi.com");
            //其实ping并不需要root权限 ,这里是ping 2次后才停止，所以启动后需要一点时间才会有显示
            //你可以自己换成需要root权限的命令试试
            String temp;
            while((temp=stream.readLine())!=null){
                System.out.println(temp);
                //循环输出返回值
            }
        } catch (Exception e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        }
    }
    public DataInputStream Terminal(String command) throws Exception
    {
        Process process = Runtime.getRuntime().exec("su");
        //执行到这，Superuser会跳出来，选择是否允许获取最高权限
        OutputStream outstream = process.getOutputStream();
        DataOutputStream DOPS = new DataOutputStream(outstream);
        InputStream instream = process.getInputStream();
        DataInputStream DIPS = new DataInputStream(instream);
        String temp = command + "\n";
        //加回车
        DOPS.writeBytes(temp);
        //执行
        DOPS.flush();
        //刷新，确保都发送到outputstream
        DOPS.writeBytes("exit\n");
        //退出
        DOPS.flush();
        process.waitFor();
        return DIPS;
    }
    public boolean isRooted() {
        //检测是否ROOT过
        DataInputStream stream;
        boolean flag=false;
        try {
            stream = Terminal("ls /data/");
            //目录哪都行，不一定要需要ROOT权限的
            if(stream.readLine()!=null)flag=true;
            //根据是否有返回来判断是否有root权限
        } catch (Exception e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();

        }

        return flag;
    }


}

转自:http://blog.csdn.net/offbye/article/details/7076252