Question

每当调用onTick方法时，我都无法动态更改textview。但我不认为这个方法被调用，因为它不会改变我的UI。

public class TimerActivity extends ActionBarActivity {

private static TextView strTime;
private static CooldownTimer timer;

private final static long start = 60000;
private final static long interval = 1000;

//private static Handler handler;

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

public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public void onStart() {
        super.onStart();

        timer.start();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.activity_timer,
                container, false);

        //handler = new Handler();

        return rootView;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onViewCreated(view, savedInstanceState);

        strTime = (TextView)view.findViewById(R.id.txtTime);
        timer = new CooldownTimer(getActivity(),start,interval);
        //timer.setMyActivity(getActivity());
    }

}

private static class CooldownTimer extends CountDownTimer{

    private Activity _context;
    private String current;

    private CooldownTimer(Activity c,long startTime, long interval){    
        super(startTime, interval);
        this._context = c;
    }

    @Override
    public void onTick(long millisUntilFinished) {
        long currentTimeInSeconds = millisUntilFinished/1000;
        current = "" + currentTimeInSeconds;
        strTime.setText(current);
    }

    @Override
    public void onFinish() {
        _context.finish();
    }



}

}

需要帮助。谢谢。这是Android初学者。

编辑：

我在这里使用处理程序类从UI线程发布，但仍然没有响应。

public class TimerActivity extends ActionBarActivity {

private static TextView strTime;
private static CooldownTimer timer;

private final static long start = 60000;
private final static long interval = 1000;

private static Handler handler;

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

public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.activity_timer,
                container, false);

        handler = new Handler();

        return rootView;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onViewCreated(view, savedInstanceState);

        strTime = (TextView)view.findViewById(R.id.txtTime);
        timer = new CooldownTimer(getActivity(),start,interval);
        timer.start();
        //timer.setMyActivity(getActivity());
    }

}

public static class CooldownTimer extends CountDownTimer{

    private Activity _context;
    private String current;

    private CooldownTimer(Activity c,long startTime, long interval){    
        super(startTime, interval);
        this._context = c;
    }

    @Override
    public void onTick(long millisUntilFinished) {
        long currentTimeInSeconds = millisUntilFinished/1000;
        current = "" + currentTimeInSeconds;
        handler.post(new Runnable(){
        @Override
            public void run() {
                strTime.setText(current);   
            }   

        });

    }

    @Override
    public void onFinish() {
        _context.finish();
    }



}
}

Answer 1

我现在得到它，我将activity_timer.xml布局引用到Activity和Fragment，这就是为什么我的片段永远不会像@ user370305那样被实例化。

现在是工作代码：

public class TimerActivity extends ActionBarActivity {

private static TextView strTime;
private static CooldownTimer timer;

private final static long start = 60000;
private final static long interval = 1000;

private static Handler handler;

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

    handler = new Handler();

    strTime = (TextView)findViewById(R.id.txtTime);
    timer = new CooldownTimer(this,start,interval);
    timer.start();
}



public static class CooldownTimer extends CountDownTimer{

    private Activity _context;
    private String current;

    private CooldownTimer(Activity c,long startTime, long interval){    
        super(startTime, interval);
        this._context = c;
    }

    @Override
    public void onTick(long millisUntilFinished) {
        long currentTimeInSeconds = millisUntilFinished/1000;
        current = "" + currentTimeInSeconds;
        handler.post(new Runnable(){
        @Override
            public void run() {
                strTime.setText(current);   
            }   

        });

    }

    @Override
    public void onFinish() {
        _context.finish();
    }



}
}

感谢您的帮助！

我无法在onTick（）方法上更改TextView

1 个答案: