如何从CountDownTimer调用活动？

Question

我当前的活动类“TimerAct.java”使用30secs的计时器。计时器完成后，必须启动一个新的活动“SMS.java”。为此，在onFinish（）中，我调用当前活动的一个方法来启动新的活动。但我得到一个味精“强制关闭”。谁能帮我吗？

下面的代码：

//TimerAct.java 
public class TimerAct extends Activity 
{ 
    static TextView timeDisplay; 
    Timer t; 
    int length = 30000; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.time); 

     timeDisplay = (TextView) findViewById(R.id.timer); 
     timeDisplay.setText("Time left: " + length/1000); 
     t = new Timer(length, 1000); 
     t.start(); 
    } 

    public void mess() 
    { 
     Intent i = new Intent(this, SMS.class); 
     startActivity(i); 
    } 
} 

//Timer.java 
public class Timer extends CountDownTimer 
{ 
    public Timer(long millisInFuture, long countDownInterval) 
    { 
     super(millisInFuture, countDownInterval); 
    } 

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

    public void onFinish() 
    { 
     TimerAct.timeDisplay.setText("Time over!!!"); 
     TimerAct ta = new TimerAct(); 
     ta.mess(); 
    } 
} 

//SMS.java 
public class SMS extends Activity 
{ 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 

     Intent sendIntent = new Intent(Intent.ACTION_VIEW); 
     sendIntent.setType("vnd.android-dir/mms-sms"); 
     startActivity(sendIntent); 

     String phoneNo = "9791192196"; 
     String message = "Hello"; 

     sendSMS(phoneNo, message); 
    } 

    //---sends an SMS message to another device--- 
    private void sendSMS(String phoneNumber, String message) 
    {   
     PendingIntent pi = PendingIntent.getActivity(this, 0, new Intent(this, SMS.class), 0); 
     SmsManager sms = SmsManager.getDefault(); 
     sms.sendTextMessage(phoneNumber, null, message, pi, null);   
    } 
} 

Answer 1

在

public void onFinish() 

使用类似：

 Intent fIntent = new Intent(); 
     fIntent.setClassName("com.pkgname", "com.pkgname.SMSActivity"); 
     startActivity(fIntent);  

编辑/更新：

你不不需要在新类中扩展新的CountDowntimer，您可以直接覆盖此处需要的方法。 你可以有这样的事情作为类的成员..

private CountDownTimer myTimer = new CountDownTimer(30000, 1000) { 
//This will give you 30 sec timer with each tick at 1 second 

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

    public void onFinish() { 
     timeDisplay.setText("Time over!!!"); 
     Intent fIntent = new Intent(); 
     fIntent.setClassName("com.pkgname", "com.pkgname.SMSActivity"); 
     startActivityForResult(fIntent,0);  
    } 
}; 

与这的onCreate（）：

TextView timeDisplay = (TextView) findViewById(R.id.timer); 
    myTimer.start();