有沒有辦法防止 call() 在例如設(shè)置布爾值之前返回值？這樣我就可以控制futureCall.get()何時(shí)完成？主類：ExecutorService executor = Executors.newCachedThreadPool();Future<List<Float>> futureCall = executor.submit((Callable<List<Float>>) new AxisMeasuring(2,100,this));List<Float> jumpValues;try {    jumpValues = futureCall.get();} catch (InterruptedException | ExecutionException e) {    e.printStackTrace();}可調(diào)用類：public class AxisMeasuring implements SensorEventListener, Callable<List<Float>>{    AxisMeasuring(int _axis, final int _timeDelay, Context _context) {        axis = _axis;        final Context context = _context;        timeDelay = _timeDelay;        handler = new Handler();        runnable = new Runnable() {            @Override            public void run() {                values.add(value);                if (!hadZeroValue && value <= 1) {                    hadZeroValue = true;                }                if (hadZeroValue && value >= 12) {                    Log.d("Debug","Point reached");                } else {                    handler.postDelayed(runnable, timeDelay);                }            }        };        handler.post(runnable);    }    @Override    public List<Float> call() throws Exception {        return values;    }}futureCall.get() 立即返回 null。