android有符号十六进制转十进制

package com.example.hextoint;



import android.media.AudioManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {
    /**
     * 当前音量
     */
    private int currentVolume;
    /**
     * 控制音量的对象
     */
    public AudioManager mAudioManager;
    /**
     * 系统最大音量
     */
    private int maxVolume;
    /**
     * 确保关闭程序后，停止线程

     */
    private boolean isDestroy;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        setContentView(R.layout.activity_main);
//        Button bn=(Button)findViewById(R.id.button1);
//        bn.setOnClickListener(new MyclickListener());
        Log.i("ceshi", "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb" );
        isDestroy = false;
        // 获得AudioManager对象
        mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);//音乐音量,如果要监听铃声音量变化，则改为AudioManager.STREAM_RING
        maxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);

    }

//    @Override
//    public boolean onCreateOptionsMenu(Menu menu) {
//        getMenuInflater().inflate(R.menu.activity_main, menu);
//        
//    
//        return true;
//    }
    
//    class MyclickListener implements View.OnClickListener
//    {
//
// public void onClick(View arg0) {
// // TODO Auto-generated method stub
//         EditText tt1=(EditText) findViewById(R.id.editText1);