是否有一个android事件监听器来改变设备的时区

Question

我有一个android应用程序。在这里，每当用户更改设备时区时，我都希望事件侦听器通知我。我怎样才能完成它?

Answer 1

用以下意图过滤器注册接收器

filter = new IntentFilter();
filter.addAction(Intent.ACTION_TIME_TICK);
filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
filter.addAction(Intent.ACTION_TIME_CHANGED);

并将其注册到活动的OnCreate

public void onCreate() {
        super.onCreate();
        registerReceiver(receiver, filter);     
    }

按如下方法创建Broadcast接收器

 private final BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            if (action.equals(Intent.ACTION_TIME_CHANGED) ||
                action.equals(Intent.ACTION_TIMEZONE_CHANGED))
            {
                doWorkSon();
            }
        }
    };

并在活动的onDestroy中注销它:

 public void onDestroy() {
    super.onDestroy();
    unregisterReceiver(m_timeChangedReceiver);     
}

Answer 2

你需要为意图动作ACTION_TIMEZONE_CHANGED创建一个BroadcastReceiver。此处描述BroadcastReceiver

Answer 3

在manifest文件

<receiver
    android:name=".MyReceiver"
    android:enabled="true"
    android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.TIMEZONE_CHANGED"/>
    </intent-filter>
</receiver>

在myReceiver类中

override fun onReceive(context: Context, intent: Intent) {
            var action : String? = intent.action
            var timeZone: String? = intent.getStringExtra("time-zone")
            Toast.makeText(context,action+timeZone,Toast.LENGTH_LONG).show()