我希望计时器从当前时间开始运行4个小时，直到将rong_answer位再次设置为0为止，即使应用程序关闭，它也不应在这之间停止。
我整个上午都尝试了各种变体，但达到此活动时应用仍然崩溃。
public class activityWrong extends AppCompatActivity {
CountdownView countview;
TextView tv2,txtTimerHour,txtTimerMinute,txtTimerSecond ;
Button tryagain;
Calendar future;
Date future_date;
private Handler handler;
private Runnable runnable;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_wrong);
txtTimerHour = (TextView) findViewById(R.id.txtTimerHour);
txtTimerMinute = (TextView) findViewById(R.id.txtTimerMinute);
txtTimerSecond = (TextView) findViewById(R.id.txtTimerSecond);
//countview = (CountdownView) findViewById(R.id.countdownView);
if(get_wrong_bit() == 0) {
Calendar cl = Calendar.getInstance();
long nowPlus4hours = cl.getTimeInMillis() + 14400000;
Toast.makeText(activityWrong.this, String.valueOf(nowPlus4hours) , Toast.LENGTH_SHORT).show();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Toast.makeText(activityWrong.this, formatter.format(future.getTime()) , Toast.LENGTH_SHORT).show();
store_countdown(formatter.format(future.getTime()));
set_wrong_bit(1);
}
countDownStart();
tryagain.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
set_wrong_bit(0);
Intent stud = new Intent(activityWrong.this,activityQuiz.class);
startActivity(stud);
finish();
}
});
}
public void countDownStart() {
tv2 = (TextView) findViewById(R.id.tv2);
tryagain = (Button) findViewById(R.id.try_again);
handler = new Handler();
runnable = new Runnable() {
@Override
public void run() {
handler.postDelayed(this, 1000);
try {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date futureDate = dateFormat.parse(get_countdown());
Date currentDate = new Date();
if (!currentDate.after(futureDate)) {
long diff = futureDate.getTime()
- currentDate.getTime();
long hours = diff / (60 * 60 * 1000);
diff -= hours * (60 * 60 * 1000);
long minutes = diff / (60 * 1000);
diff -= minutes * (60 * 1000);
long seconds = diff / 1000;
txtTimerHour.setText("" + String.format("%02d", hours));
txtTimerMinute.setText("" + String.format("%02d", minutes));
txtTimerSecond.setText("" + String.format("%02d", seconds));
} else {
tv2.setText("Punishment Over :)");
tryagain.setVisibility(View.VISIBLE);
}
} catch (Exception e) {
e.printStackTrace();
}
}
};
handler.postDelayed(runnable, 1 * 1000);
}
private void set_wrong_bit(int wrong_bit) {
SharedPreferences mSharedPreferences = getSharedPreferences("main",MODE_PRIVATE);
SharedPreferences.Editor mEditor = mSharedPreferences.edit();
mEditor.putInt("wrong_bit",wrong_bit);
mEditor.apply();
}
private int get_wrong_bit(){
SharedPreferences mSharedPreferences = getSharedPreferences("main",MODE_PRIVATE);
int checker = mSharedPreferences.getInt("wrong_bit",0);
return checker;
}
private void store_countdown(String countdown) {
SharedPreferences mSharedPreferences = getSharedPreferences("main",MODE_PRIVATE);
SharedPreferences.Editor mEditor = mSharedPreferences.edit();
mEditor.putString("countdown",countdown);
mEditor.apply();
}
private String get_countdown(){
SharedPreferences mSharedPreferences = getSharedPreferences("main",MODE_PRIVATE);
String checker = mSharedPreferences.getString("countdown","2017-09-21 17:20:00");
return checker;
}
}
我知道这不是最有效的方法，但我仍然想知道解决方案。
我觉得这与我解析未来日期的方式有关。
我已经从另一个应用程序复制了此代码，该代码工作正常，只是我在其他地方设置了固定日期，例如：
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm");
Date futureDate = dateFormat.parse("2017-09-12 1:21");
Date currentDate = new Date();
而不是从savePreference方法中检索它。
将其保存为长变量会有所帮助吗？
谢谢
这就是我在logcat上看到的全部
Logcat：
09-12 19：05：54.111 23653-23653 /？ I / FA：正在启动应用测量，版本：10298
09-12 19：05：54.111 23653-23653 /？ I / FA：要启用调试日志记录，请运行：adb shell setprop log.tag.FA VERBOSE
09-12 19：05：54.119 23653-23653 /？ I / FA：要启用更快的调试模式事件记录，请运行：
亚行外壳setprop debug.firebase.analytics.app com.bitstrips.imoji
最佳答案
没关系，我解决了。
不得不使用：
future_date = DateFormat.format("yyyy-MM-dd HH:mm:ss", new Date(nowPlus4hours)).toString();
代替 ：
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
:)