计算一次倒计时所用的时间';什么是从java开始的?
我有倒计时代码,工作正常。但我想计算一下couterdowntimer开始运行后的时间 如果我有2小时的倒计时时间。一旦它开始运行,我想计算时间,就像2:00:00小时-1:45:00=0:15:00 并在TimeOver文本视图中显示该时间 它应该随着倒计时的运行而动态改变 用户界面截图: 这是我的密码计算一次倒计时所用的时间';什么是从java开始的?,java,android,countdowntimer,Java,Android,Countdowntimer,我有倒计时代码,工作正常。但我想计算一下couterdowntimer开始运行后的时间 如果我有2小时的倒计时时间。一旦它开始运行,我想计算时间,就像2:00:00小时-1:45:00=0:15:00 并在TimeOver文本视图中显示该时间 它应该随着倒计时的运行而动态改变 用户界面截图: 这是我的密码 public class MainActivity extends AppCompatActivity { private EditText mEditTextInput;
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();
}
}
}
}
public类MainActivity扩展了AppCompatActivity{
私有EditText mEditTextInput;
私有文本视图mtextview倒计时,mTextTimeOver;
私人按钮mButtonSet;
私人按钮mButtonStartPause;
私人按钮;
专用倒数计时器mCountDownTimer;
私有布尔mTimerRunning;
私人长mStartTimeInMillis;
私有长mtimelftinmillis;
私生活时间长;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEditTextInput=findViewById(R.id.edit\u text\u input);
mTextViewCountDown=findviewbyd(R.id.text\u view\u countdown);
mTextTimeOver=findviewbyd(R.id.text\u view\u timeOver)
mButtonSet=findviewbyd(R.id.按钮组);
mButtonStartPause=findViewById(R.id.按钮\启动\暂停);
mbutonreset=findviewbyd(R.id.按钮\ U重置);
mButtonSet.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
字符串输入=mEditTextInput.getText().toString();
if(input.length()==0){
Toast.makeText(MainActivity.this,“字段不能为空”,Toast.LENGTH_SHORT.show();
返回;
}
long millisInput=long.parseLong(输入)*60000;
如果(毫秒输入==0){
Toast.makeText(MainActivity.this,“请输入正数”,Toast.LENGTH_SHORT.show();
返回;
}
设定时间(毫输入);
mEditTextInput.setText(“”);
}
});
mButtonStartPause.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
如果(mTimerRunning){
pauseTimer();
}否则{
startTimer();
}
}
});
mbutonreset.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
重置计时器();
}
});
}
私有void设置时间(长毫秒){
mStartTimeInMillis=毫秒;
重置计时器();
关闭键盘();
}
私有void startTimer(){
mEndTime=System.currentTimeMillis()+mTimeLeftInMillis;
mCountDownTimer=新的倒计时(mtimelftinmillis,1000){
@凌驾
公共void onTick(长毫秒未完成){
mTimeLeftInMillis=毫秒直至完成;
updateCountDownText();
}
@凌驾
公共无效onFinish(){
mTimerRunning=假;
updateWatchInterface();
}
}.start();
mTimerRunning=真;
updateWatchInterface();
}
私有void pauseTimer(){
mCountDownTimer.cancel();
mTimerRunning=假;
updateWatchInterface();
}
私有void resetTimer(){
mTimeLeftInMillis=mStartTimeInMillis;
updateCountDownText();
updateWatchInterface();
}
私有void updateCountDownText(){
整数小时=(整数)(mtimelftinmillis/1000)/3600;
int分钟=(int)((mTimeLeftInMillis/1000)%3600)/60;
整数秒=(整数)(mTimeLeftInMillis/1000)%60;
字符串时间倒转格式;
如果(小时数>0){
timeLeftFormatted=String.format(Locale.getDefault(),
%d:%02d:%02d”,小时、分钟、秒);
}否则{
timeLeftFormatted=String.format(Locale.getDefault(),
“%02d:%02d”,分,秒);
}
mTextViewCountDown.setText(timeLeftFormatted);
}
私有void updateWatchInterface(){
如果(mTimerRunning){
mEditTextInput.setVisibility(视图不可见);
mbutonset.setVisibility(视图不可见);
mbutonreset.setVisibility(视图不可见);
mButtonStartPause.setText(“暂停”);
}否则{
mEditTextInput.setVisibility(View.VISIBLE);
mbutonset.setVisibility(View.VISIBLE);
mButtonStartPause.setText(“开始”);
if(mTimeLeftInMillis<1000){
mButtonStartPause.setVisibility(视图不可见);
}否则{
mButtonStartPause.setVisibility(View.VISIBLE);
}
if(mTimeLeftInMillis