有人能给出一个简单的例子,每秒钟更新一个文本框左右?
我想要制作一个飞行的球,并需要每秒计算/更新球的坐标,这就是为什么我需要某种计时器。
我从这里什么也得不到。
有人能给出一个简单的例子,每秒钟更新一个文本框左右?
我想要制作一个飞行的球,并需要每秒计算/更新球的坐标,这就是为什么我需要某种计时器。
我从这里什么也得不到。
当前回答
你也可以使用动画器:
int secondsToRun = 999;
ValueAnimator timer = ValueAnimator.ofInt(secondsToRun);
timer.setDuration(secondsToRun * 1000).setInterpolator(new LinearInterpolator());
timer.addUpdateListener(new ValueAnimator.AnimatorUpdateListener()
{
@Override
public void onAnimationUpdate(ValueAnimator animation)
{
int elapsedSeconds = (int) animation.getAnimatedValue();
int minutes = elapsedSeconds / 60;
int seconds = elapsedSeconds % 60;
textView.setText(String.format("%d:%02d", minutes, seconds));
}
});
timer.start();
其他回答
他是更简单的解决方案,工作在我的应用程序。
public class MyActivity extends Acitivity {
TextView myTextView;
boolean someCondition=true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_activity);
myTextView = (TextView) findViewById(R.id.refreshing_field);
//starting our task which update textview every 1000 ms
new RefreshTask().execute();
}
//class which updates our textview every second
class RefreshTask extends AsyncTask {
@Override
protected void onProgressUpdate(Object... values) {
super.onProgressUpdate(values);
String text = String.valueOf(System.currentTimeMillis());
myTextView.setText(text);
}
@Override
protected Object doInBackground(Object... params) {
while(someCondition) {
try {
//sleep for 1s in background...
Thread.sleep(1000);
//and update textview in ui thread
publishProgress();
} catch (InterruptedException e) {
e.printStackTrace();
};
return null;
}
}
}
对于那些不能依赖Chronometer的人,我从其中一个建议中创建了一个实用程序类:
public class TimerTextHelper implements Runnable {
private final Handler handler = new Handler();
private final TextView textView;
private volatile long startTime;
private volatile long elapsedTime;
public TimerTextHelper(TextView textView) {
this.textView = textView;
}
@Override
public void run() {
long millis = System.currentTimeMillis() - startTime;
int seconds = (int) (millis / 1000);
int minutes = seconds / 60;
seconds = seconds % 60;
textView.setText(String.format("%d:%02d", minutes, seconds));
if (elapsedTime == -1) {
handler.postDelayed(this, 500);
}
}
public void start() {
this.startTime = System.currentTimeMillis();
this.elapsedTime = -1;
handler.post(this);
}
public void stop() {
this.elapsedTime = System.currentTimeMillis() - startTime;
handler.removeCallbacks(this);
}
public long getElapsedTime() {
return elapsedTime;
}
}
要使用..,只需这样做:
TimerTextHelper timerTextHelper = new TimerTextHelper(textView);
timerTextHelper.start();
…
timerTextHelper.stop();
long elapsedTime = timerTextHelper.getElapsedTime();
这是一个定时器的简单代码:
Timer timer = new Timer();
TimerTask t = new TimerTask() {
@Override
public void run() {
System.out.println("1");
}
};
timer.scheduleAtFixedRate(t,1000,1000);
enter code here
Thread th=new Thread(new Runnable() {
@Override
public void run() {
try { for(int i=0;i<5;i++) {
b1.setText(""+i);
Thread.sleep(5000);
runOnUiThread(new Runnable() {
@Override
public void run() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
pp();
}
}
});
}} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
th.start();
我用这种方法:
String[] array={
"man","for","think"
}; int j;
然后在onCreate下面
TextView t = findViewById(R.id.textView);
new CountDownTimer(5000,1000) {
@Override
public void onTick(long millisUntilFinished) {}
@Override
public void onFinish() {
t.setText("I "+array[j] +" You");
j++;
if(j== array.length-1) j=0;
start();
}
}.start();
解决这个问题很简单。