显示handler的剩余时间
Display the remaining time of the handler
我想知道如何在我的处理程序中显示剩余时间。
当我单击一个按钮时,我 运行 我的处理程序 x 秒,我想在处理程序结束之前在屏幕上显示倒计时。
试试这个:
int time = 60; // seconds
final Handler handler = new Handler();
Runnable runnable = new Runnable() {
public void run() {
time--;
mTextView.setText(time + " seconds");
}
};
handler.postDelayed(runnable, 1000);
Example of showing a 30 second countdown in a text field:
new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
}
public void onFinish() {
mTextField.setText("done!");
}
}.start();
It works fine thank you, last detail, if I put 5 seconds, it shows: 5, 4, 3, 2, 1 and 0. In the end it's 6 seconds.
Maxime,正如我在您对 Thomas Mary 的回答的评论中所读到的,您希望避免额外调用 onTick()。
你看到这个是因为 CountDownTimer 的 original implementation 在计时器启动后(没有延迟)第一次调用 onTick()。
How to remove the 0 at the end?
为此,您可以使用经过修改的 CountDownTimer:
public abstract class CountDownTimer {
private final long mMillisInFuture;
private final long mCountdownInterval;
private long mStopTimeInFuture;
private boolean mCancelled = false;
public CountDownTimer(long millisInFuture, long countDownInterval) {
mMillisInFuture = millisInFuture;
mCountdownInterval = countDownInterval;
}
public synchronized final void cancel() {
mCancelled = true;
mHandler.removeMessages(MSG);
}
public synchronized final CountDownTimer start() {
mCancelled = false;
if (mMillisInFuture <= 0) {
onFinish();
return this;
}
mStopTimeInFuture = SystemClock.elapsedRealtime() + mMillisInFuture;
onTick(mMillisInFuture);
mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG), mCountdownInterval);
return this;
}
public abstract void onTick(long millisUntilFinished);
public abstract void onFinish();
private static final int MSG = 1;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
synchronized (CountDownTimer.this) {
if (mCancelled)
return;
final long millisLeft = mStopTimeInFuture - SystemClock.elapsedRealtime();
if (millisLeft <= 0) {
onFinish();
} else {
onTick(millisLeft);
sendMessageDelayed(obtainMessage(MSG), mCountdownInterval);
}
}
}
};
}
请注意,您可能需要相应地调整 onTick() 方法中的实现。
我想知道如何在我的处理程序中显示剩余时间。 当我单击一个按钮时,我 运行 我的处理程序 x 秒,我想在处理程序结束之前在屏幕上显示倒计时。
试试这个:
int time = 60; // seconds
final Handler handler = new Handler();
Runnable runnable = new Runnable() {
public void run() {
time--;
mTextView.setText(time + " seconds");
}
};
handler.postDelayed(runnable, 1000);
Example of showing a 30 second countdown in a text field:
new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
}
public void onFinish() {
mTextField.setText("done!");
}
}.start();
It works fine thank you, last detail, if I put 5 seconds, it shows: 5, 4, 3, 2, 1 and 0. In the end it's 6 seconds.
Maxime,正如我在您对 Thomas Mary 的回答的评论中所读到的,您希望避免额外调用 onTick()。
你看到这个是因为 CountDownTimer 的 original implementation 在计时器启动后(没有延迟)第一次调用 onTick()。
How to remove the 0 at the end?
为此,您可以使用经过修改的 CountDownTimer:
public abstract class CountDownTimer {
private final long mMillisInFuture;
private final long mCountdownInterval;
private long mStopTimeInFuture;
private boolean mCancelled = false;
public CountDownTimer(long millisInFuture, long countDownInterval) {
mMillisInFuture = millisInFuture;
mCountdownInterval = countDownInterval;
}
public synchronized final void cancel() {
mCancelled = true;
mHandler.removeMessages(MSG);
}
public synchronized final CountDownTimer start() {
mCancelled = false;
if (mMillisInFuture <= 0) {
onFinish();
return this;
}
mStopTimeInFuture = SystemClock.elapsedRealtime() + mMillisInFuture;
onTick(mMillisInFuture);
mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG), mCountdownInterval);
return this;
}
public abstract void onTick(long millisUntilFinished);
public abstract void onFinish();
private static final int MSG = 1;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
synchronized (CountDownTimer.this) {
if (mCancelled)
return;
final long millisLeft = mStopTimeInFuture - SystemClock.elapsedRealtime();
if (millisLeft <= 0) {
onFinish();
} else {
onTick(millisLeft);
sendMessageDelayed(obtainMessage(MSG), mCountdownInterval);
}
}
}
};
}
请注意,您可能需要相应地调整 onTick() 方法中的实现。