Android 怎样接收十六进制数据？急！！！

package com.android.book;



import com.android.book.DBAdapter;

import android.app.Activity;

import android.content.Intent;

import android.database.Cursor;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

import android.widget.Toast;



public class Nearby extends SerialPortActivity {

	TextView tv=null;

	String bookname;

	String str="";

	String check, check2;

	int find=0;

	int i=1;

	DBAdapter db = new DBAdapter(this);

	@Override

	protected void onDataReceived(final byte[] buffer, final int size) {

	       

		runOnUiThread(new Runnable() {

			public void run() {

				if ( tv!= null && size >0) {

					str=str+new String(buffer,0,size);

					int start=str.indexOf(8');

					int end=str.indexOf('9');

					while(end<start){

						str=str.substring(start);

						start=str.indexOf('8');

						end=str.indexOf('9');

						if(start<end-6){

							check=str.substring(start+1,end);

							if(find==0){

								tv.append(check);

								find=1;

								find(check);

							}

							return;

						}

						if(end==-1)

							break;

					}

					if(start<end-6){

						check=str.substring(start+1,end);

						if(find==0){

							tv.append(check);

							find=1;

							find(check);

						}

					}

				

				}

			}

		});

		

		 tv.setOnClickListener(new View.OnClickListener() {

				

				@Override

				public void onClick(View v) {

					// TODO Auto-generated method stub

					int i = 4;

					Intent intent = new Intent(); 

		            intent.setClass(Nearby.this,user9.class); 

		            Bundle bundle = new Bundle();

		            bundle.putString("name",check);

		            bundle.putInt("i", i);

		            intent.putExtras(bundle);

		            startActivity(intent); 

				}

			});

		}

	private void find(String book)

	{

		int c=0;

	      db.open();

	        Cursor c1 = db.getISBN(book);

	        if (c1.moveToFirst())

	        {

	        	c++;

	         		//db.updateTitle(c1.getString(0), c1.getString(1), c1.getString(2), c1.getString(3), c1.getString(4), "yes");

	        DisplayTitle(c1,tv);

	        } while (c1.moveToNext());        



	       db.close();

	}

	public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.nearby);        

         Intent intent =this.getIntent();

       

        tv=(TextView)findViewById(R.id.TextView_content);

        

        /*button_return to user1*/

        Button b1 = (Button) findViewById(R.id.Button_return);        

        b1.setOnClickListener(new Button.OnClickListener() 

        {

          public void onClick(View v) 

          { 

           	  Intent intent = new Intent(); 

              intent.setClass(Nearby.this,enter.class); 

              startActivity(intent);

            Nearby.this.finish();

            } 

          }); 

        

  

       

	}

	

	public void DisplayTitle (Cursor c,TextView tv)

	{

	tv.setText( c.getString(2) + "\n");

	}

	

}

	

package com.android.book;



import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.security.InvalidParameterException;



import com.android.book.Application;

import com.android.book.R;



import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.content.DialogInterface.OnClickListener;

import android.os.Bundle;

import android.serialport.SerialPort;



public abstract class SerialPortActivity extends Activity {



	protected Application mApplication;

	protected SerialPort mSerialPort;

	protected OutputStream mOutputStream;

	private InputStream mInputStream;

	private ReadThread mReadThread;



	private class ReadThread extends Thread {



		@Override

		public void run() {

			super.run();

			while(!isInterrupted()) {

				int size;

				try {

					byte[] buffer = new byte[64];

					if (mInputStream == null) return;

					size = mInputStream.read(buffer);

					if (size > 0) {

						onDataReceived(buffer, size);

					}

				} catch (IOException e) {

					e.printStackTrace();

					return;

				}

			}

		}

	}



	private void DisplayError(int resourceId) {

		AlertDialog.Builder b = new AlertDialog.Builder(this);

		b.setTitle("Error");

		b.setMessage(resourceId);

		b.setPositiveButton("OK", new OnClickListener() {

			public void onClick(DialogInterface dialog, int which) {

				SerialPortActivity.this.finish();

			}

		});

		b.show();

	}



	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		mApplication = (Application) getApplication();

		try {

			mSerialPort = mApplication.getSerialPort();

			mOutputStream = mSerialPort.getOutputStream();

			mInputStream = mSerialPort.getInputStream();



			/* Create a receiving thread */

			mReadThread = new ReadThread();

			mReadThread.start();

		} catch (SecurityException e) {

			DisplayError(R.string.error_security);

		} catch (IOException e) {

			DisplayError(R.string.error_unknown);

		} catch (InvalidParameterException e) {

			DisplayError(R.string.error_configuration);

		}

	}



	protected abstract void onDataReceived(final byte[] buffer, final int size);



	@Override

	protected void onDestroy() {

		if (mReadThread != null)

			mReadThread.interrupt();

		mApplication.closeSerialPort();

		mSerialPort = null;

		super.onDestroy();

	}

}