如何从Android的另一个类中调用方法？

Question

我一直在尝试调用另一个类的方法。

我有2个班。 Timer.class和DecisionMaking.class。定时器在onFinish（）之后，Timer类将假定从DecisionMaking.class中调用一个方法（我刚刚使用了一个toast）。在我的代码中没有错误，但是当计时器完成计数时，该方法未被调用并且模拟器要求强制关闭。这两个类都在同一个包中。有什么我失踪的？

Timer.class

public class Timer extends Activity{ 

    TextView timeDisplay; 
    MyCount timer; 
    int length = 10000; 
    long startTime; 
    long timeRemaining; 
    DecisionMaking decisionmaking; 


    /** Called when the activity is first created. */ 

    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    timeDisplay = (TextView) findViewById(R.id.timer); 
    timer = new MyCount(length, 1000); 

    timer.start(); 

} 

public class MyCount extends CountDownTimer { 

public MyCount(long millisInFuture, long countDownInterval) { 
      super(millisInFuture, countDownInterval); 
    } 

    public void onFinish() { 

     DecisionMaking decisionmaking = new DecisionMaking(); 
     decisionmaking.sendSms(); 

    timer.start(); 
    } 

    public void onTick(long millisUntilFinished) { 
     timeDisplay.setText("Time:" + millisUntilFinished/1000); 
    } 
    } 

}

DecisionMaking.class

public class DecisionMaking extends Timer{ 

public void onCreate(Bundle savedInstanceState) {   
    super.onCreate(savedInstanceState); 

    sendSms(); 
    } 

    public boolean sendSms() { 

    Calendar cal = Calendar.getInstance(); 
     Date d = cal.getTime(); 
     int hour = d.getHours(); 

    if (hour > 0 && hour < 6) 
     return false; 
    else 
     { 
     //Call SMS class here, remove toast 
     Toast.makeText(getBaseContext(), "SMS sent.", Toast.LENGTH_SHORT).show(); 

     return true; 
    } 
} 
} 

Answer 1

我觉得没有必要再调用timer.start在onFinish（）方法。