[英]Timers in Android Studio using CountDownTimer
请参阅我正在尝试获取用户输入的时间并使用用户输入尝试在 Android studio 4.2.2 中运行 CountDownTimer 函数
问题是 :-
当我传递变量名代替countDown 计时器函数的 millisInFuture属性并尝试相应地设置 textview 时, TextView 没有设置任何内容。
public void timer() {
CountDownTimer countDownTimer = new CountDownTimer(**timeValueIntent**, 1000) {
@Override
public void onTick(long millisUntilFinished) {
// mediaPlayer.setLooping(true);
//mediaPlayer.start();
timerValueTextView.setText(String.valueOf(millisUntilFinished / 1000) + "s");
}
@Override
public void onFinish() {
Toast.makeText(getApplicationContext(), "Timed out", Toast.LENGTH_SHORT).show();
restartButton.setVisibility(View.VISIBLE);
restartButton.setEnabled(true);
quitButton.setVisibility(View.VISIBLE);
setBtnCond(true);
//mediaPlayer.stop();
}
}.start();
}`
但是当我在CountDownTimer 的millisInFuture属性中传递 int 值(如 1000 等)并设置textView 时,它会成功设置。
public void timer() {
CountDownTimer countDownTimer = new CountDownTimer(**300000**, 1000) {
@Override
public void onTick(long millisUntilFinished) {
// mediaPlayer.setLooping(true);
//mediaPlayer.start();
timerValueTextView.setText(String.valueOf(millisUntilFinished / 1000) + "s");
}
@Override
public void onFinish() {
Toast.makeText(getApplicationContext(), "Timed out", Toast.LENGTH_SHORT).show();
restartButton.setVisibility(View.VISIBLE);
restartButton.setEnabled(true);
quitButton.setVisibility(View.VISIBLE);
setBtnCond(true);
//mediaPlayer.stop();
}
}.start();
}`
任何人都可以帮助我在CountDownTimer 函数的MillisInFuture属性中传递变量名而不是硬编码的整数值。!!? `
我有一些与您的问题类似的源代码,只是实施您的项目。
初始化变量
private static final long START_TIME_IN_MILLIS = 600000;
private TextView mTextViewCountDown;
private Button mButtonStartPause;
private Button mButtonReset;
private CountDownTimer mCountDownTimer;
private boolean mTimerRunning;
private long mTimeLeftInMillis = START_TIME_IN_MILLIS;
在创建
//Init
mTextViewCountDown = findViewById(R.id.text_view_countdown);
mButtonStartPause = findViewById(R.id.button_start_pause);
mButtonReset = findViewById(R.id.button_reset);
mButtonStartPause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mTimerRunning) {
pauseTimer(); //pauseFunction
} else {
startTimer(); //StartFunction
}
}
});
mButtonReset.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
resetTimer(); // resetFunction
}
});
updateCountDownText(); //updateEverySecond
开始定时器()
mCountDownTimer = new CountDownTimer(mTimeLeftInMillis, 1000) {
@Override
public void onTick(long millisUntilFinished) {
mTimeLeftInMillis = millisUntilFinished;
updateCountDownText();
}
@Override
public void onFinish() {
mTimerRunning = false;
mButtonStartPause.setText("Start");
mButtonStartPause.setVisibility(View.INVISIBLE);
mButtonReset.setVisibility(View.VISIBLE);
}
}.start();
mTimerRunning = true;
mButtonStartPause.setText("pause");
mButtonReset.setVisibility(View.INVISIBLE);
暂停定时器()
mCountDownTimer.cancel();
mTimerRunning = false;
mButtonStartPause.setText("Start");
mButtonReset.setVisibility(View.VISIBLE);
重置定时器()
mTimeLeftInMillis = START_TIME_IN_MILLIS;
updateCountDownText();
mButtonReset.setVisibility(View.INVISIBLE);
mButtonStartPause.setVisibility(View.VISIBLE);
updateCountDownText()
int minutes = (int) (mTimeLeftInMillis / 1000) / 60;
int seconds = (int) (mTimeLeftInMillis / 1000) % 60;
String timeLeftFormatted = String.format(Locale.getDefault(), "%02d:%02d", minutes, seconds);
mTextViewCountDown.setText(timeLeftFormatted);
最后是XML
<TextView
android:id="@+id/text_view_countdown"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="00:00"
android:textColor="@android:color/black"
android:textSize="60sp" />
<Button
android:id="@+id/button_start_pause"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text_view_countdown"
android:layout_centerHorizontal="true"
android:text="start" />
<Button
android:id="@+id/button_reset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text_view_countdown"
android:layout_marginStart="11dp"
android:layout_toEndOf="@+id/button_start_pause"
android:text="reset"
android:visibility="invisible"
tools:visibility="visible" />
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