我有倒计时代码,可以正常工作。但是我想计算一下couterdowntimer开始运行后的时间。
例如如果我有2个小时在countdowntimer中运行。一旦开始运行,我想计算时间,例如2:00:00 hrs-1:45:00 = 0:15:00
并在TimeOver TextView中显示该时间。
应该与倒数计时器一起运行动态更改。
UI屏幕截图:
这是我的代码。
public class MainActivity extends AppCompatActivity {
private EditText mEditTextInput;
private TextView mTextViewCountDown,mTextTimeOver;
private Button mButtonSet;
private Button mButtonStartPause;
private Button mButtonReset;
private CountDownTimer mCountDownTimer;
private boolean mTimerRunning;
private long mStartTimeInMillis;
private long mTimeLeftInMillis;
private long mEndTime;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEditTextInput = findViewById(R.id.edit_text_input);
mTextViewCountDown = findViewById(R.id.text_view_countdown);
mTextTimeOver = findViewById(R.id.text_view_timeOver)
mButtonSet = findViewById(R.id.button_set);
mButtonStartPause = findViewById(R.id.button_start_pause);
mButtonReset = findViewById(R.id.button_reset);
mButtonSet.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String input = mEditTextInput.getText().toString();
if (input.length() == 0) {
Toast.makeText(MainActivity.this, "Field can't be empty", Toast.LENGTH_SHORT).show();
return;
}
long millisInput = Long.parseLong(input) * 60000;
if (millisInput == 0) {
Toast.makeText(MainActivity.this, "Please enter a positive number", Toast.LENGTH_SHORT).show();
return;
}
setTime(millisInput);
mEditTextInput.setText("");
}
});
mButtonStartPause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mTimerRunning) {
pauseTimer();
} else {
startTimer();
}
}
});
mButtonReset.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
resetTimer();
}
});
}
private void setTime(long milliseconds) {
mStartTimeInMillis = milliseconds;
resetTimer();
closeKeyboard();
}
private void startTimer() {
mEndTime = System.currentTimeMillis() + mTimeLeftInMillis;
mCountDownTimer = new CountDownTimer(mTimeLeftInMillis, 1000) {
@Override
public void onTick(long millisUntilFinished) {
mTimeLeftInMillis = millisUntilFinished;
updateCountDownText();
}
@Override
public void onFinish() {
mTimerRunning = false;
updateWatchInterface();
}
}.start();
mTimerRunning = true;
updateWatchInterface();
}
private void pauseTimer() {
mCountDownTimer.cancel();
mTimerRunning = false;
updateWatchInterface();
}
private void resetTimer() {
mTimeLeftInMillis = mStartTimeInMillis;
updateCountDownText();
updateWatchInterface();
}
private void updateCountDownText() {
int hours = (int) (mTimeLeftInMillis / 1000) / 3600;
int minutes = (int) ((mTimeLeftInMillis / 1000) % 3600) / 60;
int seconds = (int) (mTimeLeftInMillis / 1000) % 60;
String timeLeftFormatted;
if (hours > 0) {
timeLeftFormatted = String.format(Locale.getDefault(),
"%d:%02d:%02d", hours, minutes, seconds);
} else {
timeLeftFormatted = String.format(Locale.getDefault(),
"%02d:%02d", minutes, seconds);
}
mTextViewCountDown.setText(timeLeftFormatted);
}
private void updateWatchInterface() {
if (mTimerRunning) {
mEditTextInput.setVisibility(View.INVISIBLE);
mButtonSet.setVisibility(View.INVISIBLE);
mButtonReset.setVisibility(View.INVISIBLE);
mButtonStartPause.setText("Pause");
} else {
mEditTextInput.setVisibility(View.VISIBLE);
mButtonSet.setVisibility(View.VISIBLE);
mButtonStartPause.setText("Start");
if (mTimeLeftInMillis < 1000) {
mButtonStartPause.setVisibility(View.INVISIBLE);
} else {
mButtonStartPause.setVisibility(View.VISIBLE);
}
if (mTimeLeftInMillis < mStartTimeInMillis) {
mButtonReset.setVisibility(View.VISIBLE);
} else {
mButtonReset.setVisibility(View.INVISIBLE);
}
}
}
private void closeKeyboard() {
View view = this.getCurrentFocus();
if (view != null) {
InputMethodManager imm = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
}
@Override
protected void onStop() {
super.onStop();
SharedPreferences prefs = getSharedPreferences("prefs", MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
editor.putLong("startTimeInMillis", mStartTimeInMillis);
editor.putLong("millisLeft", mTimeLeftInMillis);
editor.putBoolean("timerRunning", mTimerRunning);
editor.putLong("endTime", mEndTime);
editor.apply();
if (mCountDownTimer != null) {
mCountDownTimer.cancel();
}
}
@Override
protected void onStart() {
super.onStart();
SharedPreferences prefs = getSharedPreferences("prefs", MODE_PRIVATE);
mStartTimeInMillis = prefs.getLong("startTimeInMillis", 600000);
mTimeLeftInMillis = prefs.getLong("millisLeft", mStartTimeInMillis);
mTimerRunning = prefs.getBoolean("timerRunning", false);
updateCountDownText();
updateWatchInterface();
if (mTimerRunning) {
mEndTime = prefs.getLong("endTime", 0);
mTimeLeftInMillis = mEndTime - System.currentTimeMillis();
if (mTimeLeftInMillis < 0) {
mTimeLeftInMillis = 0;
mTimerRunning = false;
updateCountDownText();
updateWatchInterface();
} else {
startTimer();
}
}
}
}