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Android:恢復履歷時間

[英]Android : Restore time in resume

我有一個問題,我的應用中有一個計時器,當我返回主窗口並返回到計時器活動時,我只想從CountDownTimer恢復計時器的時間,該如何進行? Bundle對我和類似的主題沒有幫助:(我將非常感謝您的幫助。

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);
        }
    }

}

利用onSaveInstanceState 重寫此方法,並將您當前的時間保存到Bundle中。 然后,在onCreate ,從Bundle中提取值並將其應用於視圖。

嗯,是的,Alex說的沒錯,但我有新主意。 CountDownTimer開始計數,我們單擊了backButton活動被殺死,但是CountDownTimer仍在計數,但是當我再次使用此活動時,我可以運行新計時器,這很瘋狂,有任何辦法可以做到這一點:在create方法中,我們檢查CountDownTimer仍在運行,我們只是更新了一個計時器,但如果不是,我們是否會從new中創建所有內容? 現在,我的解決方案很棘手:重寫onBackPressed()並添加此moveTaskToBack(true); 但這不返回我的mainActivity,而是返回電話屏幕。

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