Android 监听时间变化

在Android应用中，有几种方式可以监听系统时间的变化。以下是几种常见的方法：

1. 使用BroadcastReceiver监听时间变化广播

Android系统会在时间发生变化时发送以下广播：

public class TimeChangeReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (Intent.ACTION_TIME_CHANGED.equals(intent.getAction())) {
            // 用户手动更改了时间
            Log.d("TimeChange", "System time was manually changed");
        } else if (Intent.ACTION_TIMEZONE_CHANGED.equals(intent.getAction())) {
            // 时区发生了变化
            String newTimezone = intent.getStringExtra("time-zone");
            Log.d("TimeChange", "Timezone changed to: " + newTimezone);
        } else if (Intent.ACTION_DATE_CHANGED.equals(intent.getAction())) {
            // 日期发生了变化
            Log.d("TimeChange", "Date changed");
        }
    }
}

在AndroidManifest.xml中注册：

<receiver android:name=".TimeChangeReceiver">
    <intent-filter>
        <action android:name="android.intent.action.TIME_SET" />
        <action android:name="android.intent.action.TIMEZONE_CHANGED" />
        <action android:name="android.intent.action.DATE_CHANGED" />
    </intent-filter>
</receiver>

或者在代码中动态注册：

IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_TIME_CHANGED);
filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
filter.addAction(Intent.ACTION_DATE_CHANGED);
registerReceiver(timeChangeReceiver, filter);

2. 使用AlarmManager定期检查时间变化

AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, TimeCheckService.class);
PendingIntent pendingIntent = PendingIntent.getService(this, 0, intent, 0);

// 每分钟检查一次
alarmManager.setRepeating(AlarmManager.RTC, System.currentTimeMillis(), 60000, pendingIntent);

3. 使用ContentObserver监听系统时间设置变化

public class TimeSettingsObserver extends ContentObserver {
    public TimeSettingsObserver(Handler handler) {
        super(handler);
    }

    @Override
    public void onChange(boolean selfChange) {
        super.onChange(selfChange);
        // 时间或时区设置发生了变化
        checkTimeChange();
    }

    private void checkTimeChange() {
        // 实现你的时间变化检测逻辑
    }
}

// 注册观察者
ContentResolver resolver = getContentResolver();
TimeSettingsObserver observer = new TimeSettingsObserver(new Handler());
resolver.registerContentObserver(
    Settings.System.getUriFor(Settings.System.TIME_12_24),
    false,
    observer
);

4. 使用SystemClock监听时间变化

// 获取当前时间
long currentTime = System.currentTimeMillis();

// 定期检查时间变化
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        long newTime = System.currentTimeMillis();
        if (Math.abs(newTime - currentTime) > THRESHOLD) {
            // 检测到时间变化
            onTimeChanged();
        }
        currentTime = newTime;
        handler.postDelayed(this, CHECK_INTERVAL);
    }
}, CHECK_INTERVAL);