setResult跳转问题失败了

一个安卓程序，在所有activity中都有一个按钮，可以返回主activity，但是有一个activity出现了不能回到主activity界面，而是单纯的finsh()返回上一个activity了，但是其他的页面的这个按钮都是可以用的。
代码：
public class HelpInfoActivity extends BaseActivity implements OnClickListener{
private ViewFlipper helpImageView;
private float firstposition;
int currentImg = 0;
private static final int FLING_MIN_DISTANCE = 200;

private TextView tvHeadTitle;
private TextView btBack, btMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_helpinfo);
helpImageView= (ViewFlipper)findViewById(R.id.iv_helpinfoimage);

    IntentFilter filter = new IntentFilter( );
    filter.addAction("android.navi.ok"); //方向盘OK
    registerReceiver(mIntentReceiver, filter);

    tvHeadTitle=(TextView) findViewById(R.id.tv_shb_title);
    tvHeadTitle.setText("使用帮助");
    btBack = (TextView) findViewById(R.id.bt_back);
    btMap = (TextView) findViewById(R.id.bt_map);

    btBack.setOnClickListener(this);
    btMap.setOnClickListener(this);

    helpImageView.setOnTouchListener(new OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if(event.getAction() == MotionEvent.ACTION_DOWN){
                firstposition = event.getX();
            }
            if(event.getAction() == MotionEvent.ACTION_UP){
                float secondposition = event.getX();
                updatePage(secondposition);
            }
            return true;
        }
    });
}


private final BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals("android.navi.ok")) {
            if (currentImg++ < 4) {
                helpImageView.setInAnimation(inFromRightAnimation());
                helpImageView.setOutAnimation(outToLeftAnimation());
                helpImageView.showNext();
            } else {
                finish();
            }
        }
    }
};

@Override
protected void onStop() {
    super.onStop();
    unregisterReceiver(mIntentReceiver);
}


/** * 定义从右侧进入的动画效果 * @return */
protected Animation inFromRightAnimation() {
    Animation inFromRight = new TranslateAnimation(
            Animation.RELATIVE_TO_PARENT, +1.0f,
            Animation.RELATIVE_TO_PARENT, 0.0f,
            Animation.RELATIVE_TO_PARENT, 0.0f,
            Animation.RELATIVE_TO_PARENT, 0.0f);
    inFromRight.setDuration(500);
    inFromRight.setInterpolator(new AccelerateInterpolator());
    return inFromRight;
}

/** * 定义从左侧退出的动画效果 * @return */
protected Animation outToLeftAnimation() {
    Animation outtoLeft = new TranslateAnimation(
            Animation.RELATIVE_TO_PARENT, 0.0f,
            Animation.RELATIVE_TO_PARENT, -1.0f,
            Animation.RELATIVE_TO_PARENT, 0.0f,
            Animation.RELATIVE_TO_PARENT, 0.0f);
    outtoLeft.setDuration(500);
    outtoLeft.setInterpolator(new AccelerateInterpolator());
    return outtoLeft;
}

/** * 定义从左侧进入的动画效果 * @return */
protected Animation inFromLeftAnimation() {
    Animation inFromLeft = new TranslateAnimation(
            Animation.RELATIVE_TO_PARENT, -1.0f,
            Animation.RELATIVE_TO_PARENT, 0.0f,
            Animation.RELATIVE_TO_PARENT, 0.0f,
            Animation.RELATIVE_TO_PARENT, 0.0f);
    inFromLeft.setDuration(500);
    inFromLeft.setInterpolator(new AccelerateInterpolator());
    return inFromLeft;
}

/** * 定义从右侧退出时的动画效果 * @return */
protected Animation outToRightAnimation() {
    Animation outtoRight = new TranslateAnimation(
            Animation.RELATIVE_TO_PARENT, 0.0f,
            Animation.RELATIVE_TO_PARENT, +1.0f,
            Animation.RELATIVE_TO_PARENT, 0.0f,
            Animation.RELATIVE_TO_PARENT, 0.0f);
    outtoRight.setDuration(500);
    outtoRight.setInterpolator(new AccelerateInterpolator());
    return outtoRight;
}

public void updatePage(float secondposition) {
    if (secondposition - firstposition < 0
            && Math.abs(secondposition - firstposition) > FLING_MIN_DISTANCE) {
        if (currentImg++ < 4) {
            helpImageView.setInAnimation(inFromRightAnimation());
            helpImageView.setOutAnimation(outToLeftAnimation());
            helpImageView.showNext();
        } else {
            finish();
        }

    } else if (secondposition - firstposition > 0
            && Math.abs(secondposition - firstposition) > FLING_MIN_DISTANCE) {
        if (currentImg-- > 0) {
            helpImageView.setInAnimation(inFromLeftAnimation());
            helpImageView.setOutAnimation(outToRightAnimation());
            helpImageView.showPrevious();
        } else {
            currentImg = 0;
        }

    }
}


@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    switch(v.getId()){

    case R.id.bt_back:
        this.finish();
        break;
    case R.id.bt_map:
        this.setResult(ActivityCode.INTEGRATED_GO_MAP);
        this.finish();
        break;
    }

}

}

但是这个activity就可以成功跳转：
public class PayTMCActivity extends FragmentActivity
{

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_pay_tmc);

    findViewById(R.id.bt_map).setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View view)
        {
            setResult(ActivityCode.INTEGRATED_GO_MAP);
            finish();
        }
    });

    findViewById(R.id.bt_back).setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View view)
        {
            onBackPressed();
        }
    });

    getSupportFragmentManager().beginTransaction().add(R.id.frame_pay_tmc, new PayTMCMainFragment()).commit();
}

}

是不是返回主Activity，关键看你当前显示的activity下面的activity是不是主activity
比如A打开了B，B打开了C，那么C返回的正常来说就是返回到B，除非你做了Task或者在C关闭的时候主动跳转到A，否则返回不到A这个Activity