java - onCreate() 被无限调用

Question

我是 Android 新手，我不明白为什么我的 Activity 中的 onCreate() 被一遍又一遍地调用。在我的 MainActivity 中，我有这个函数搜索，按下按钮时会调用该函数。

private void search(View v){
    //Get input fields if null then dont restrict search
    ... 
    ...
    Intent i = new Intent(getApplicationContext(), PersonActivity.class);
    i.putExtra("miles",numMiles);
    i.putExtra("min",numMin);
    startActivity(i);
}

然后在我的 PersonActivity 类中我有这个 onCreate 方法。

public class PersonActivity extends ActionBarActivity {
private static final String TAG = MainActivity.class.getSimpleName();
public ArrayList<PersonInfo> people;
private LayoutInflater inflater;
private Context _context;
public PersonInfoListAdapter _adapter;
public static ListView _list;
public int _position;
private static final String APP_ID = "4cae6e4d7d89bc4b02196b352ae91650";
// Find this in your developer console
private static final String API_KEY = "4A3243EECEA842F7B1FC6E7A4B00DA7A";

public PersonActivity() {}

@Override
protected void onCreate(Bundle savedInstanceState) {;

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_person);
    View listV = findViewById(R.id.friendList);
    _list = (ListView) listV;
    CMApiCredentials.initialize(APP_ID, API_KEY, getApplicationContext());

    try {
        people = new ArrayList<PersonInfo>();

        Context context = _list.getContext();
        _adapter = new PersonInfoListAdapter(context, people);
        _list.setAdapter(_adapter);

    } catch (Exception e) {
        e.printStackTrace();
    }

    _list.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View view) {
            View parentRow = (View) view.getParent();
            return true;
        }
    });

    Integer numMin = -1;
    Integer numMiles = -1;
    Bundle extras = getIntent().getExtras();
    if (extras != null) {
        numMin = extras.getInt("min");
        numMiles = extras.getInt("miles");
        Log.d("Person Activity", "Miles" + numMiles.toString());
    }

    queryForPeople(numMiles, numMin);
}

private void queryForPeople(Integer numMiles, Integer numMin){
    //Get users location
    LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
    LocationListener locationListener = new MyLocationListener();
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 10, locationListener);
    Location lastKnownLoc = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);


    double lat = lastKnownLoc.getLatitude();
    double lon = lastKnownLoc.getLongitude();

    Intent myIntent = new Intent(this, PersonActivity.class);
    startActivity(myIntent);
    //search for friends
    PersonInfo.searchObjects(this, SearchQuery.filter("location").near(lon, lat).within(numMiles, DistanceUnits.mi).searchQuery(),
            new Response.Listener<CMObjectResponse>() {
                @Override
                public void onResponse(CMObjectResponse response) {
                    List<CMObject> objectList = response.getObjects();
                    for (CMObject o : objectList) {
                        PersonInfo p = (PersonInfo) o;
                        people.add(p);
                        Log.d(TAG, "Person was found: " + p.getName());
                    }

                }
            });

    _adapter.notifyDataSetChanged();
}


private class MyLocationListener implements LocationListener {

    @Override
    public void onLocationChanged(Location loc) {
        Toast.makeText(
                getBaseContext(),
                "Location changed: Lat: " + loc.getLatitude() + " Lng: "
                        + loc.getLongitude(), Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onProviderDisabled(String provider) {}

    @Override
    public void onProviderEnabled(String provider) {}

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {}
}

问题是我的 personActivity 中的 onCreate() 正在被调用。我不明白为什么。 queryForPeople 调用 API，该 API 返回我用来填充适配器中使用的人员 ArrayList 的信息。

有什么想法吗？

Answer 1

您的 queryForPeople 方法对您已经运行的 Activity 调用 startActivity。所以这最终将是无限递归的。我不明白你为什么想从 Activity 的任何地方开始，这根本没有意义。除非您打算对这两行进行其他操作，否则只需将其删除即可。