我正在尝试使用 Java 在 Android 上制作倒数计时器。有一个计时器，一个 25 分钟的学习计时器和一个 5 分钟的休息计时器。我有两个计时器都在工作。但是，我不知道如何取消/清除计时器。如果我单击我启动学习计时器和中断计时器，它们将同时运行，我不希望这样。我希望在打开另一个计时器时取消原来的计时器。这是代码。
btnStart.setOnClickListener(新的 OnClickListener() {
public void onClick(View v){
btnStart.setEnabled(false);
btnBreak.setEnabled(true);
breakBoolean = false;
CountDownTimer timer;
long amountOfStudyTime = 1500000; //30 seconds (may cause problems)
long countDownInterval = 1000; //1 second
//Initialise the countdown timer
timer = new CountDownTimer(amountOfStudyTime, countDownInterval){
public void onTick(long millisUntilFinished){
if( studyBoolean = false ) {
tViewTime.setText("CountDownTimer Canceled/stopped.");
cancel();
breakBoolean = true;
}else{
//display remaining seconds to user
tViewTime.setText(""+String.format("%d min, %d sec",
TimeUnit.MILLISECONDS.toMinutes( millisUntilFinished),
TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));
}
}
public void onFinish(){
//When countdown is finished do...
breakBoolean = true;
int currentScore = Integer.parseInt(editScore.getText().toString());
int finalScore = currentScore + 5;
editScore.setText(Integer.toString(finalScore));
tViewTime.setText("Done");
}
}.start();
}
});
//Set a click listener for break button
btnBreak.setOnClickListener(new OnClickListener() {
public void onClick(View v){
btnStart.setEnabled(true);
btnBreak.setEnabled(false);
studyBoolean = false;
CountDownTimer timer2;
long amountOfBreakTime = 300000; //30 seconds (may cause problems)
long countDownInterval = 1000; //1 second
//Initialise the countdown timer
timer2 = new CountDownTimer(amountOfBreakTime, countDownInterval){
public void onTick(long millisUntilFinished){
if( breakBoolean = false ) {
cancel();
studyBoolean = true;
}else{
//display remaining seconds to user
tViewTime.setText(""+String.format("%d min, %d sec",
TimeUnit.MILLISECONDS.toMinutes( millisUntilFinished),
TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));
}
}
public void onFinish(){
//When countdown is finished do...
tViewTime.setText("Done");
studyBoolean = true;
}
}.start();
}
});
最佳答案
在您的 Activity 中创建两个 CountDownTimer 对象并根据您选择的按钮取消它们:
public class MainActivity extends Activity {
boolean breakIsRunning = false;
boolean startIsRunning = false;
Button btnStart,btnBreak;
CountDownTimer startTimer = new CountDownTimer(amountOfStudyTime, countDownInterval)
{
@Override
public void onFinish() {
//do something
startIsRunning = false;
}
@Override
public void onTick(long arg0) {
//do something
startIsRunning = true;
}
};
CountDownTimer breakTimer = new CountDownTimer(amountOfBreakTime, countDownInterval)
{
@Override
public void onFinish() {
//do something
breakIsRunning = false;
}
@Override
public void onTick(long arg0) {
//do something
breakIsRunning = true;
}
};
//->OnCreate() - >Buttons code
btnStart.setOnClickListener(new OnClickListener().. { // your listener code here
if(breakIsRunning)
breakTimer.cancel();
startTimer.start();
}
btnBreak.setOnClickListener(new OnClickListener().. { //
if(startIsRunning)
startTimer.cancel();
breakTimer.start();
}
}
关于Java/Android 倒数计时器，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33792211/