Android检测设备是否有root权限

package com.example.testdroid;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;
   
public class MainActivity extends Activity {  
    /** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        if(isRooted()){  
          Toast.makeText(this, "设备已被root", Toast.LENGTH_LONG).show();
        } else {
          Toast.makeText(this, "设备没有被root", Toast.LENGTH_LONG).show();
        }
    }  
    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;  
    }  
}