如何调用从CountDownTimer活动？ [英] How to call an activity from a CountDownTimer?

问题描述

我现在的活动类TimerAct.java利用30secs的计时器。在定时器完成一个新的活动SMS.java必须启动。为此，在onFinish（）我叫启动新的活动我的当前活动的方法。但我得到一个味精强制关闭。谁能帮我？

这里的code：

  // TimerAct.java
公共类TimerAct扩展活动
{
    静态的TextView timeDisplay;
    定时器T;
    INT长度= 30000;    / **当第一次创建活动调用。 * /
    @覆盖
    公共无效的onCreate（捆绑savedInstanceState）
    {
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.time）;        timeDisplay =（的TextView）findViewById（R.id.timer）;
        timeDisplay.setText（剩余时间的长度+ / 1000）;
        T =新的Timer（长，1000）;
        t.start（）;
    }    公共无效乱（）
    {
        意图I =新意图（这一点，SMS.class）;
        startActivity（ⅰ）;
    }
}//Timer.java
公共类定时器扩展CountDownTimer
{
    公共定时器（长millisInFuture，长countDownInterval）
    {
        超（mil​​lisInFuture，countDownInterval）;
    }    公共无效onTick（长millisUntilFinished）
    {
        TimerAct.timeDisplay.setText（剩余时间+ millisUntilFinished / 1000）;
    }    公共无效onFinish（）
    {
        TimerAct.timeDisplay.setText（时间超过!!!）;
        TimerAct TA =新TimerAct（）;
        ta.mess（）;
    }
}//SMS.java
公共类短信扩展活动
{
    / **当第一次创建活动调用。 * /
    @覆盖
    公共无效的onCreate（捆绑savedInstanceState）
    {
        super.onCreate（savedInstanceState）;        意图sendIntent =新意图（Intent.ACTION_VIEW）;
        sendIntent.setType（vnd.android-DI​​R / MMS短信）;
        startActivity（sendIntent）;        字符串PHONENO =9791192196;
        字符串消息=你好;        sendSMS（PHONENO，消息）;
    }    // ---发送SMS消息到另一装置---
    私人无效sendSMS（字符串phoneNumber的，字符串消息）
    {
        的PendingIntent圆周率= PendingIntent.getActivity（在此，0，新意图（此，SMS.class），0）;
        SmsManager短信= SmsManager.getDefault（）;
        sms.sendTextMessage（phoneNumber的，空，消息，PI，NULL）;
    }
}
 

解决方案

在

 公共无效onFinish（）
 

使用类似：

 意图fIntent =新意图（）;
        fIntent.setClassName（com.pkgname，com.pkgname.SMSActivity）;
        startActivity（fIntent）;
 

修改/更新：

您不需要在一个新的类扩展新的CountDowntimer，可以直接忽略它这是在这里所需的方法。
你可以有这样的事情作为类的成员。

 私人CountDownTimer myTimer =新CountDownTimer（30000，1000）{
//这会给你30秒计时器滴答各以1秒    公共无效onTick（长millisUntilFinished）{
        timeDisplay.setText（剩余时间的长度+ / 1000）;
    }    公共无效onFinish（）{
        timeDisplay.setText（时间超过!!!）;
        意图fIntent =新的Intent（）;
        fIntent.setClassName（com.pkgname，com.pkgname.SMSActivity）;
        startActivityForResult（fIntent，0）;
    }
 };
 

考虑到这的onCreate（）：

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

My current activity class "TimerAct.java" makes use of a timer of 30secs. Upon the completion of the timer a new activity "SMS.java" must be initiated. For this, in onFinish() i call a method of my current activity that starts the new activity. But i get a msg to "Force Close". Can anyone help me out?

Here's the code:

//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);        
    }
}

解决方案

In

public void onFinish()

Use something like:

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

Edit/Update:

You don't need to extend a new CountDowntimer in a new class, you can directly override its methods which are required here. You can have something like this as a member of class..

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);    
    }
 };

with this in onCreate() :

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

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