我想知道如何在单击按钮时取消计时器任务..我正在做一个简单的数学游戏，因为我已经分配了一个用于更改textview文本的timertask，我想取消它时单击按钮。但是当我这样做时，我正在退出应用程序
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报告是
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)
答案 0 :(得分：1)
放入按钮的onClickListener（）：
if（t！= null） t.cancel（）;
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();
}
});
答案 1 :(得分：0)
只需在按钮cancel方法的第一个链接中调用Timer对象上的onClick即可。
答案 2 :(得分：0)
您可以使用标志。
在onclick中，您可以将标志设置为false，然后在计时器中执行检查，以便仅在标志为真/设置时执行。
而不是OnClick中的this.t.cancel写flag = false
然后在你的计时器任务中
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);
}
}
});
}
};