如何在点击按钮之前取消定时器任务

我想知道当按钮被点击时如何取消定时器任务..我正在做一个简单的数学游戏，因为我已经分配了一个时间任务改变一个TextView的文本，我想取消按钮时clicked.But我得到了应用程序的时候我这样做如何在点击按钮之前取消定时器任务

public class MainActivity extends Activity implements OnClickListener { 
Button b1, b2,b3; 
ImageView i, i2, i3; 
TextView t1, t2, t3,t4; 
String s1, s2, s3, s4, s5; 
LinearLayout pooku; 
Button bk; 
int q, m, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, n[]; 
Random r1 = new Random(); 
Random r0 = new Random(); 
Handler handler = new Handler(); 
Runnable r; 
Timer t = new Timer(); 

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

    b1 = (Button) findViewById(R.id.button1); 
    b2 = (Button) findViewById(R.id.button2); 
    b3 = (Button) findViewById(R.id.button3); 

    pooku = (LinearLayout) findViewById(R.id.pooka); 
    i = (ImageView) findViewById(R.id.imageView1); 
    t1 = (TextView) findViewById(R.id.textView1); 
    t2 = (TextView) findViewById(R.id.textView2); 
    t3 = (TextView) findViewById(R.id.textView3); 
    t4= (TextView) findViewById(R.id.textView4); 
    b1.setOnClickListener(this); 
    b2.setOnClickListener(this); 
    b3.setOnClickListener(this); 

    imp(); 

} 

public TimerTask malli(){ 
return new TimerTask() { 
    public void run() { 
     runOnUiThread(new Runnable() { 

      public void run() { 

      t4.setText("times up"); 

      t4.setVisibility(View.VISIBLE); 

      } 

      }); 
    } 
}; 
} 

public void imp() { 

    t.schedule(malli(), 3000); 



    r2 = r1.nextInt(9) + 1; 
    r3 = r1.nextInt(9) + 1; 
    r4 = r2 + r3; 
    r5 = r2 - r3; 
    r6 = r2 * r3; 

    n = new int[] { r4, r5, r6 }; 

    doit(); 
    while (r9 == r11 || r9 == r13 || r11 == r13) { 
     doit(); 
    } 
    s1 = Integer.toString(r2); 
    s2 = Integer.toString(r3); 
    s3 = Integer.toString(r9); 
    s4 = Integer.toString(r11); 
    s5 = Integer.toString(r13); 
    t1.setText(s1); 
    t2.setText(s2); 
    b1.setText(s3); 
    b2.setText(s4); 
    b3.setText(s5); 

    int[] images = { R.drawable.plus, R.drawable.minus, R.drawable.multiply }; 

    Random random = new Random(); 




    m = images[random.nextInt(images.length)]; 
    i.setImageResource(m); 
    bk.setFocusable(true); 
    bk.requestFocus(); 
    bk.requestFocusFromTouch(); 
} 

public void doit() { 
    r9 = 0; 
    r11 = 0; 
    r13 = 0; 
    r8 = r1.nextInt(3) + 0; 
    r9 = n[r8]; 
    r10 = r1.nextInt(3) + 0; 
    r11 = n[r10]; 
    r12 = r1.nextInt(3) + 0; 
    r13 = n[r12]; 
    int[] buttons = { R.id.button1, R.id.button2, R.id.button3 }; 
    q = buttons[r0.nextInt(buttons.length)]; 
    bk = (Button) findViewById(q); 

} 

@Override 
public void onClick(View v) { 
    switch (v.getId()) { 
    case R.id.button1: 
     click(r9, b1); 

     break; 
    case R.id.button2: 
     click(r11, b2); 
     break; 
    case R.id.button3: 
     click(r13, b3); 
     break; 
    } 
} 

public void click(int k, Button b) { 
    if (m == R.drawable.plus && k == r4 || m == R.drawable.minus && k == r5 
      || m == R.drawable.multiply && k == r6) { 

     t3.setVisibility(View.INVISIBLE); 
     t4.setVisibility(View.INVISIBLE); 
     this.t.cancel(); 
     imp(); 
     t4.setVisibility(View.INVISIBLE); 

    } else { 
     t3.setText("FINISH"); 
     t3.setVisibility(View.VISIBLE); 
     b.setPressed(true); 
     b1.setClickable(false); 
     b2.setClickable(false); 
     b3.setClickable(false); 
     b.requestFocusFromTouch(); 

    } 
    } 
}

和logcat的报告

04-04 16:47:47.681: E/AndroidRuntime(11493): Process: com.example.emo2, PID: 11493 
04-04 16:47:47.681: E/AndroidRuntime(11493): java.lang.IllegalStateException: Timer was canceled 
04-04 16:47:47.681: E/AndroidRuntime(11493): at java.util.Timer.scheduleImpl(Timer.java:561) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at java.util.Timer.schedule(Timer.java:459) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at com.example.emo2.MainActivity.imp(MainActivity.java:74) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at com.example.emo2.MainActivity.click(MainActivity.java:154) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at com.example.emo2.MainActivity.onClick(MainActivity.java:135) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at android.view.View.performClick(View.java:4443) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at android.view.View$PerformClick.run(View.java:18442) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at android.os.Handler.handleCallback(Handler.java:733) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at android.os.Handler.dispatchMessage(Handler.java:95) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at android.os.Looper.loop(Looper.java:136) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at android.app.ActivityThread.main(ActivityThread.java:5021) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at java.lang.reflect.Method.invokeNative(Native Method) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at java.lang.reflect.Method.invoke(Method.java:515) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:82 7) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643) 
04-04 16:47:47.681: E/AndroidRuntime(11493): at dalvik.system.NativeStart.main(Native Method)

来源

2015-04-04 KRISHNA TEJA

你是什么意思 “出来的应用程序”？ – 2015-04-04 11:19:03

它崩溃说“不幸你的应用程序已停止工作” – 2015-04-04 11:35:17

把你的按钮的onClickListener（）：

如果（T！= NULL）吨。取消（）;

代码示例：

final TextView t1 = (TextView) findViewById(R.id.yourpay); 

final Timer t =new Timer(); 
t.schedule(new TimerTask() { 

    @Override 
    public void run() { 
     runOnUiThread(new Runnable() { 

      public void run() { 
       money = (PPS+Reserve); 
       Reserve = (money); 
       t1.setText("$" + money); //Place your text data here 

       // Removed the stopping condition/counter 

      } 
     }); 
    } 
}, 1000, 1000); // Do you really want to wait 1 second before executing the timer's code? If not, change the 1st "1000" to a "0" 


final Button b = (Button) findViewById(R.id.my_button_id); // Replace with your button's id 
b.setOnClickListener(new OnClickListener() { 
    @Override 
    public void onClick(View v) { 
     if (t != null) 
      t.cancel(); 
     } 
});

来源

2015-04-04 11:52:52 Sohail

但是，我还有一个问题，如果我在3秒钟之前按下按钮，任务必须取消，但在这里即使当我在3秒内按下按钮不止一次，文本在第一个3秒后发生变化点击然后在3秒钟之前到达第二次点击.... @sohail – 2015-04-04 12:10:57

只需拨打对Timer对象在您的屁股的第一个链接在onClick方法。

来源

2015-04-04 11:23:22

我做了这件事...检查点击（）; – 2015-04-04 11:26:10

尝试在任何逻辑检查之前将它放在'onClick'的第一行 – 2015-04-04 11:30:28

您必须每次创建一个新的'Timer'对象，否则不能使用同一个对象。 – 2015-04-04 11:34:50

您可以使用此标志。在onclick中，您可以将一个标志设置为false，然后在您的计时器中执行一次检查，以便只在该标志为true/set时执行。而不是this.t.cancel在你的OnClick写flag = false

，然后在你的计时器任务

public TimerTask malli(){ 
    return new TimerTask() { 
     public void run() { 
      runOnUiThread(new Runnable() { 

       public void run() { 

        if(flag){ 
         t4.setText("times up"); 
         t4.setVisibility(View.VISIBLE); 
        } 
       } 

      }); 
    } 
};

来源

2015-04-04 11:52:00 Saurabh

如何在点击按钮之前取消定时器任务

回答

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