Android内部存储改变读取权限的方法

public synchronized static boolean getRoot(String paramString)
	  {
	    Process process = null;
	    DataOutputStream os = null;
	    try
	    {
	      process = Runtime.getRuntime().exec("su");
	      os = new DataOutputStream(process.getOutputStream());
	      os.writeBytes(paramString + "n");
	      os.writeBytes("exitn");
	      os.flush();
	      process.waitFor();
	    } catch (Exception localException)
	    {
	      System.out.println("@@@@root cmd error:"+localException);
	      //localException.printStackTrace();
	      return false;
	    }finally {
	      try {
	        if (os != null) {
	          os.close();
	        }
	        process.destroy();
	      } catch (Exception e) {
	      	System.out.println("###root cmd error:"+e);
	      }
	    }
	    return true;
	  }

getRoot("chmod -R 777 /data/data/com.xxxxx/databases/wa.db");