我有疑问我的应用程序中有一个计时器,当我回到主窗口,然后回到计时器活动时,我只想在计时器上从CountDownTimer恢复一段时间,该怎么做? Bundle对我和类似主题没有帮助:(我将非常感谢任何帮助。
public class Timer extends Activity {
private boolean start = false; // Semafor to button
private Chronometer timer; // Chronometr
private CountDownTimer count; // CountDown class
private final long startTime = 30 * 1000; // High
private final long end = 1 * 1000; //LOw
private ImageButton startB; // Button
private int VIBRATION_TIME = 1000; //vibration time
private Bundle state = new Bundle(); //button state
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_timer);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
// Show the Up button in the action bar.
getActionBar().setDisplayHomeAsUpEnabled(true);
}
this.timer = ((Chronometer) findViewById(R.id.chronometer1));
count = new MyCountDownTimer(startTime, end);
timer.setText("00:" + String.valueOf(startTime / 1000));
startB = (ImageButton) this.findViewById(R.id.start_pause);
startB.setBackgroundResource(R.drawable.start_button);
startB.setOnClickListener(new View.OnClickListener() {
// click init
@Override
public void onClick(View v) {
start = !start;
if (start == true) {
count.start(); // start count
startB.setBackgroundResource(R.drawable.stop_button);
} else {
count.cancel(); // pause count
startB.setBackgroundResource(R.drawable.start_button);
}
}
});
}
....
@Override
protected void onResume() {
super.onResume();
start = state.getBoolean("Button");
}
@Override
protected void onPause() {
super.onPause();
state.putBoolean("Button", start);
//count.cancel(); I don't wanna this!
}
class MyCountDownTimer extends CountDownTimer {
public MyCountDownTimer(long startTime, long interval) {
super(startTime, interval);
}
@Override
public void onFinish() {
timer.setText("00:00");
// TO DO :
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(VIBRATION_TIME);
startB.setBackgroundResource(R.drawable.start_button);
}
@Override
public void onTick(long millisUntilFinished) {
long tmp = millisUntilFinished / 1000;
timer.setText("00:" + tmp);
}
}
}
答案 0 :(得分:5)
利用onSaveInstanceState
。重写此方法,并将当前时间保存到Bundle中。然后,在onCreate
上,从Bundle中提取值并将其应用到View。
答案 1 :(得分:0)
嗯,是的,这是正确的亚历克斯说,但我有新的想法。 CountDownTimer开始计数,我们单击backButton活动被杀死,但CountDownTimer仍在计数,但是当我再次使用此活动时,我可以运行新的计时器,这很疯狂,有任何方法可以这样做:在create方法中我们检查一下CountDownTimer仍在运行,我们只是更新一个天文台,但如果没有,我们会创建新的一切?现在我的解决方案很棘手:覆盖onBackPressed()并添加this moveTaskToBack(true);但这不是回到我的mainActivity而是回到电话屏幕。