我正在我的应用程序中集成SupportPlaceAutocompleteFragment。下面的片段在ViewPager里面......第一次一切正常......但是当我第二次进入片段时，我的应用程序崩溃了......我收到以下错误：
FATAL EXCEPTION: main
Process: rollwithme.com.rollwithme, PID: 14946
java.lang.NullPointerException: Attempt to invoke virtual method
'void android.widget.EditText.setText(java.lang.CharSequence)' on a null object reference
at com.google.android.gms.location.places.ui.SupportPlaceAutocompleteFragment.setText(Unknown Source)
at com.google.android.gms.location.places.ui.SupportPlaceAutocompleteFragment$2.onClick(Unknown Source)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
这是我的代码：
/**
* A simple {@link Fragment} subclass.
*/
public class PlanFragment extends Fragment implements View.OnClickListener {
private static final int PERMISSION_ACCESS_COARSE_LOCATION = 10102;
private static final String TAG = "PlanFragment";
Calendar myCalendar = Calendar.getInstance();
private View fragmentLayout;
private ImageButton startCurrent;
private Button routeButton;
private EditText dateEditText, timeEditText;
private EditText startEditText1, endEditText1;
GPSTracker gps;
private SupportPlaceAutocompleteFragment startEditText, endEditText;
private com.google.android.gms.maps.model.LatLng startLatLng;
private com.google.android.gms.maps.model.LatLng endLatLng;
private DateTime journeyDate = new DateTime();
public PlanFragment() {
// Required empty public constructor
}
public static PlanFragment newInstance() {
PlanFragment fragment = new PlanFragment();
return fragment;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (startEditText != null) {
startEditText.onCreate(savedInstanceState);
}
if (endEditText != null) {
endEditText.onCreate(savedInstanceState);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
if(fragmentLayout != null){
View oldParent = (View) container.getParent();
if(oldParent != container){
((ViewGroup)oldParent).removeView(fragmentLayout);
}
//return fragmentLayout;
}else {
fragmentLayout = (ViewGroup) inflater.inflate(R.layout.fragment_plan, container, false);
}
if(startEditText == null){
startEditText = (SupportPlaceAutocompleteFragment) getChildFragmentManager().findFragmentById(R.id.place_autocomplete_fragment);
((ImageButton) startEditText.getView().findViewById(R.id.place_autocomplete_search_button)).setImageResource(R.drawable.ic_search_white_24dp);
startEditText1 = (EditText) fragmentLayout.findViewById(R.id.place_autocomplete_search_input);
((EditText) startEditText.getView().findViewById(R.id.place_autocomplete_search_input)).setTextColor(Utils.getColor(getActivity(), R.color.white));
((EditText) startEditText.getView().findViewById(R.id.place_autocomplete_search_input)).setHintTextColor(Utils.getColor(getActivity(), R.color.white));
startEditText.setHint("Starting");
}
if(endEditText == null){
endEditText = (SupportPlaceAutocompleteFragment) getChildFragmentManager().findFragmentById(R.id.endEditText_place_autocomplete_fragment);
((ImageButton) endEditText.getView().findViewById(R.id.place_autocomplete_search_button)).setImageResource(R.drawable.ic_search_white_24dp);
endEditText1 = (EditText) fragmentLayout.findViewById(R.id.place_autocomplete_search_input);
((EditText) endEditText.getView().findViewById(R.id.place_autocomplete_search_input)).setTextColor(Utils.getColor(getActivity(), R.color.white));
((EditText) endEditText.getView().findViewById(R.id.place_autocomplete_search_input)).setHintTextColor(Utils.getColor(getActivity(), R.color.white));
endEditText.setHint("Ending");
endEditText.setOnPlaceSelectedListener(new PlaceSelectionListener() {
@Override
public void onPlaceSelected(Place place) {
// TODO: Get info about the selected place.
Log.i(TAG, "Place: " + place.getName());
endLatLng = place.getLatLng();
}
@Override
public void onError(Status status) {
// TODO: Handle the error.
Log.i(TAG, "An error occurred: " + status);
}
});
}
if(startEditText == null){
// startEditText = (SupportPlaceAutocompleteFragment) SupportPlaceAutocompleteFragment.instantiate(getActivity(), "com.google.android.gms.location.places.ui.SupportPlaceAutocompleteFragment");
startEditText.setOnPlaceSelectedListener(new PlaceSelectionListener() {
@Override
public void onPlaceSelected(Place place) {
// TODO: Get info about the selected place.
Log.i(TAG, "Place: " + place.getName());
startLatLng = place.getLatLng();
}
@Override
public void onError(Status status) {
// TODO: Handle the error.
Log.i(TAG, "An error occurred: " + status);
}
});
}
return fragmentLayout;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
checkPermission();
startCurrent = (ImageButton) fragmentLayout.findViewById(R.id.startCurrent);
routeButton = (Button) fragmentLayout.findViewById(R.id.takeMeBtn);
dateEditText = (EditText) fragmentLayout.findViewById(R.id.date);
timeEditText = (EditText) fragmentLayout.findViewById(R.id.time);
dateEditText.setInputType(InputType.TYPE_NULL);
dateEditText.setOnClickListener(this);
(fragmentLayout.findViewById(R.id.dateView)).setOnClickListener(this);
timeEditText.setInputType(InputType.TYPE_NULL);
timeEditText.setOnClickListener(this);
(fragmentLayout.findViewById(R.id.timeView)).setOnClickListener(this);
startCurrent.setOnClickListener(this);
routeButton.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.timeView:
case R.id.time:
new TimePickerDialog(getActivity(), timeSetListener, myCalendar
.get(Calendar.HOUR_OF_DAY), myCalendar.get(Calendar.MINUTE), true).show();
break;
case R.id.dateView:
case R.id.date:
new DatePickerDialog(getActivity(), date, myCalendar
.get(Calendar.YEAR), myCalendar.get(Calendar.MONTH),
myCalendar.get(Calendar.DAY_OF_MONTH)).show();
break;
case R.id.startCurrent:
checkPermission();
break;
case R.id.takeMeBtn:
if (!((EditText) startEditText.getView().findViewById(R.id.place_autocomplete_search_input)).getText().toString().trim().isEmpty() && !((EditText) endEditText.getView().findViewById(R.id.place_autocomplete_search_input)).getText().toString().trim().isEmpty() && !dateEditText.getText().toString().trim().isEmpty() && !timeEditText.getText().toString().trim().isEmpty()) {
Intent routeIntent = new Intent(getActivity(), RouteActivity.class);
Routes route = new Routes();
route.setStartLocation(((EditText) startEditText.getView().findViewById(R.id.place_autocomplete_search_input)).getText().toString().trim());
route.setEndLocation( ((EditText) endEditText.getView().findViewById(R.id.place_autocomplete_search_input)).getText().toString().trim());
route.setStartLatLng(startLatLng);
route.setEndLatLng(endLatLng);
Toast.makeText(getActivity(), journeyDate.toString(), Toast.LENGTH_LONG).show();
CustomLog.printVerbose(TAG, journeyDate.toString());
route.setJourneyTime(journeyDate);
RouteSingleTon.getInstance().setRoutes(route);
startActivity(routeIntent);
} else {
Utils.showAlertDialog(getActivity(), "All field are required");
}
break;
default:
break;
}
}
final DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
// TODO Auto-generated method stub
myCalendar.set(Calendar.YEAR, year);
myCalendar.set(Calendar.MONTH, monthOfYear);
myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
journeyDate = new DateTime(year, monthOfYear + 1, dayOfMonth, journeyDate.getHourOfDay(), journeyDate.getMinuteOfHour());
// Toast.makeText(getActivity(), journeyDate.toString(), Toast.LENGTH_LONG).show();
updateDate();
}
};
final TimePickerDialog.OnTimeSetListener timeSetListener = new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker timePicker, int i, int i1) {
timeEditText.setText(i + ":" + i1);
journeyDate = new DateTime(journeyDate.getYear(), journeyDate.getMonthOfYear(), journeyDate.getDayOfMonth(), i, i1);
// Toast.makeText(getActivity(), journeyDate.toString(), Toast.LENGTH_LONG).show();
}
};
private void updateDate() {
String myFormat = "MM/dd/yy"; //In which you need put here
SimpleDateFormat sdf = new SimpleDateFormat(myFormat, Locale.US);
dateEditText.setText(sdf.format(myCalendar.getTime()));
}
public void hideKeyboard(View view) {
InputMethodManager inputMethodManager = (InputMethodManager) getActivity().getSystemService(Activity.INPUT_METHOD_SERVICE);
inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
void checkPermission() {
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSION_ACCESS_COARSE_LOCATION);
} else {
new GpsCall().execute("");
// gps = new GPSTracker(getActivity(), getActivity());
// // Check if GPS enabled
// if (gps.canGetLocation()) {
//
// double latitude = gps.getLatitude();
// double longitude = gps.getLongitude();
//
// // \n is for new line
// GeoApiContext context = new GeoApiContext().setApiKey(Constants.API_KEY_GMAP);
// try {
// GeocodingResult coding[] = GeocodingApi.newRequest(context).latlng(new LatLng(gps.getLatitude(), gps.getLongitude())).await();
// if (startEditText != null)
// startEditText.setText(coding[0].formattedAddress + "");
// } catch (Exception e) {
// e.printStackTrace();
// }
// } else {
// // Can't get location.
// // GPS or network is not enabled.
// // Ask user to enable GPS/network in settings.
// gps.showSettingsAlert();
// }
}
// if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION)
// != PackageManager.PERMISSION_GRANTED) {
// ActivityCompat.requestPermissions(getActivity(), new String[] { Manifest.permission.ACCESS_COARSE_LOCATION },
// PERMISSION_ACCESS_COARSE_LOCATION);
// }
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case PERMISSION_ACCESS_COARSE_LOCATION:
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// contacts-related task you need to do.
new GpsCall().execute("");
// gps = new GPSTracker(getActivity(), getActivity());
//
// // Check if GPS enabled
// if (gps.canGetLocation()) {
//
// double latitude = gps.getLatitude();
// double longitude = gps.getLongitude();
//
// // \n is for new line
// //Toast.makeText(getActivity(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
// GeoApiContext context = new GeoApiContext().setApiKey(Constants.API_KEY_GMAP);
// try {
// GeocodingResult coding[] = GeocodingApi.newRequest(context).latlng(new LatLng(gps.getLatitude(), gps.getLongitude())).await();
// if (startEditText != null)
// startEditText.setText(coding[0].formattedAddress + "");
// } catch (Exception e) {
// e.printStackTrace();
// }
// } else {
// // Can't get location.
// // GPS or network is not enabled.
// // Ask user to enable GPS/network in settings.
// gps.showSettingsAlert();
// }
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(getActivity(), "You need to grant permission", Toast.LENGTH_SHORT).show();
}
break;
}
}
private class GpsCall extends AsyncTask<String, Long, String> {
@Override
protected String doInBackground(String... params) {
gps = new GPSTracker(getActivity(), getActivity());
if (gps.canGetLocation()) {
// double latitude = gps.getLatitude();
// double longitude = gps.getLongitude();
GeoApiContext context = new GeoApiContext().setApiKey(Constants.API_KEY_GMAP);
try {
// GeocodingResult coding[] = GeocodingApi.newRequest(context).latlng(new com.google.maps.model.LatLng(gps.getLatitude(), gps.getLongitude())).await();
GeocodingResult coding[] = GeocodingApi.newRequest(context).latlng(new LatLng(gps.getLatitude(), gps.getLongitude())).await();
if (coding.length > 0) {
RouteSingleTon.getInstance().getRoutes().setStartLatLng(new com.google.android.gms.maps.model.LatLng(gps.getLatitude(), gps.getLongitude()));
return coding[0].formattedAddress + "";
}
} catch (Exception e) {
e.printStackTrace();
}
} else {
// Can't get location.
// GPS or network is not enabled.
// Ask user to enable GPS/network in settings.
gps.showSettingsAlert();
}
return null;
}
@Override
protected void onPostExecute(String response) {
Log.v("msg", "gps response");
if (response != null) {
if (startEditText != null)
startEditText.setText(response + "");
}
//setTextToTextView(jsonArray);
}
}
private void getCurrentLocation() {
CustomLocationManager.getCustomLocationManager().getCurrentLocation(getActivity(), locationValue);
}
public LocationValue locationValue = new LocationValue() {
@Override
public void getCurrentLocation(Location location) {
// You will get location here if the GPS is enabled
if (location != null) {
Log.d("LOCATION", location.getLatitude() + ", " + location.getLongitude());
}
}
};
@Override
public void onResume() {
super.onResume();
if (startEditText != null)
startEditText.onResume();
if (endEditText != null)
endEditText.onResume();
}
//
@Override
public void onPause() {
super.onPause();
if (startEditText != null)
startEditText.onPause();
if (endEditText != null)
endEditText.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
if (startEditText != null)
startEditText.onDestroy();
if (endEditText != null)
endEditText.onDestroy();
// getChildFragmentManager().beginTransaction().remove(startEditText).commit();
// getChildFragmentManager().beginTransaction().remove(endEditText).commit();
}
}
这是我在通过SupportPlaceAutocompleteFragment.class代码后修复它以查看如何使用所选位置设置按钮文本的方法。
我注意到它从Edittext获取文本（R.id.place_autocomplete_search_input）
所以这就是我所做的。
初始化位置
location = (SupportPlaceAutocompleteFragment)
getChildFragmentManager()
.findFragmentById(R.id.place_autocomplete_fragment);
placetxt=(EditText)editprofileview.findViewById(R.id.place_autocomplete_search_input);
这就是我用try / catch设置文本的方法
try {
location.setText("Accra,Ghana");
}catch (Exception e){
Log.e(TAG," "+e);
placetxt.setText("Accra,Ghana");
}
假设：按钮文本使用edittext中的文本设置。