捕获不到Intent.ACTION_TIME_TICK


package com.testcase.teany;import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;public class SystemTimeListenerTestCaseActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        BroadcastReceiver receiver = new BroadcastReceiver() { @Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if(action.equals(Intent.ACTION_TIME_TICK)) {
System.out.println("系统时间改变");
}
}
        
        };
        
        IntentFilter intentFilter = new IntentFilter(Intent.ACTION_TIME_TICK);
        registerReceiver(receiver, intentFilter);
    }
}新手求教