重新打开片段时应用程序崩溃
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【中文标题】重新打开片段时应用程序崩溃【英文标题】：App Crashing while Reopening Fragment 【发布时间】：2018-10-07 12:54:08 【问题描述】：大家好，我的应用程序在随机打开选项卡时崩溃，并且在我的 logcat 中出现这样的错误，谁能帮我解决这个问题
在这个片段中，我集成了在 Listview 标题中显示地图信息，因为我正在使用 SupportMapFragment
这是我的以下代码
public class ChainTab extends Fragment implements ResponseListner, OnMapReadyCallback, LocationListener, GoogleMap.OnMarkerClickListener
String TAG = ChainTab.class.getSimpleName();
String bottleId;
String url;
ListView bottleChainListView;
// NonScrollListView bottleChainListView;
Context context;
View rootView;
String responseVal;
private GoogleMap mMap;
private LocationManager mLocationManager = null;
private String provider = null;
private Marker mCurrentPosition = null;
ProgressDialog PD;
private List<BottleInfoModel> bottleInfoModelList;
private List<CreatedAt> createdAtList;
private List<UpdatedAt> updatedAtList;
private List<Scans> scansList;
private Polyline mPolyline = null;
private LatLng mSourceLatLng = null;
private LatLng mDestinationLatLng = null;
TextView serialNoTV, entityNameTV, productTypeChainTV, originTV, getQTYUOM, entityType;
public View onCreateView(LayoutInflater inflater, ViewGroup viewGroup, Bundle savedInstanceState)
rootView = inflater.inflate(R.layout.chain_tab, viewGroup, false);
bottleInfoModelList = new ArrayList<>();
createdAtList = new ArrayList<CreatedAt>();
updatedAtList = new ArrayList<>();
scansList = new ArrayList<>();
context = getActivity();
bottleChainListView = rootView.findViewById(R.id.bottleChainListView);
return rootView;
public void displayMsgs(NdefMessage[] msgs)
if (msgs == null || msgs.length == 0)
return;
StringBuilder builder = new StringBuilder();
List<ParsedNdefRecord> records = NdefMessageParser.parse(msgs[0]);
final int size = records.size();
for (int i = 0; i < size; i++)
ParsedNdefRecord record = records.get(i);
String str = record.str();
builder.append(str).append("\n");
Log.i(TAG,"NFC Id Value is :: "+builder.toString().trim());
// fab.setVisibility(View.VISIBLE);
// bottleSerialNo = textVal.getText().toString().trim();
// bottleSerialNo = "testing";
ServerHit serverHit = new ServerHit();
// url = AppConfig.REGISTER_BOTTLE_INFO + "/" + builder.toString().trim();
url = AppConfig.REGISTER_BOTTLE_INFO + "/" + "testing";
if(context != null)
serverHit.getScannedBottleInfo(context, url, this);
else
Log.i(TAG, "Context Value is Null....154");
@Override
public String onResponse(String response)
responseVal = response;
try
JSONObject jsonObject = new JSONObject(response.toString());
JSONObject payloadObject = jsonObject.getJSONObject("payload");
// for (int i =0; i<payloadObject.length(); i++)
JSONArray jsonArray = payloadObject.getJSONArray("scans");
BottleInfoModel bottleInfoModel = new BottleInfoModel();
bottleInfoModel.setEntityName(payloadObject.getString("entityName"));
bottleInfoModel.setEntityType(payloadObject.getString("entityType"));
JSONObject createdDateObj = payloadObject.getJSONObject("created_at");
CreatedAt createdAt = new CreatedAt();
createdAt.setDate(createdDateObj.getString("date"));
createdAtList.add(createdAt);
bottleInfoModel.setCreatedAtList(createdAtList);
for (int j = 0; j <= jsonArray.length() - 1; j++)
JSONObject jsonObjectScan = jsonArray.getJSONObject(j);
Scans scansModel = new Scans();
scansModel.setEntityType(jsonObjectScan.getString("entityType"));
scansModel.setEntityName(jsonObjectScan.getString("entityName"));
scansModel.setCreated_at(jsonObjectScan.getString("created_at"));
scansModel.setLat(jsonObjectScan.getString("lat"));
scansModel.setLongVal(jsonObjectScan.getString("long"));
scansList.add(scansModel);
bottleInfoModel.setScansList(scansList);
bottleInfoModelList.add(bottleInfoModel);
// LayoutInflater inflater = getLayoutInflater();
// View viewGroup = inflater.inflate(R.layout.chaintab_lv_header, bottleChainListView, false);
LayoutInflater inflater=(LayoutInflater)context.getSystemService(LAYOUT_INFLATER_SERVICE);
View view=inflater.inflate(R.layout.chaintab_lv_header,bottleChainListView, false);
// viewLand=inflater.inflate(R.layout.activity_main_land,null);
SupportMapFragment mapFragment = (SupportMapFragment) this.getChildFragmentManager().findFragmentById(R.id.fragment_track_order_map_fragment);
mapFragment.getMapAsync(this);
entityNameTV = (TextView) view.findViewById(R.id.entityNameTV);
serialNoTV = (TextView) view.findViewById(R.id.serialNoTV);
entityType = (TextView) view.findViewById(R.id.entityType);
getQTYUOM = (TextView) view.findViewById(R.id.getQTYUOM);
originTV = (TextView) view.findViewById(R.id.originTV);
productTypeChainTV = (TextView) view.findViewById(R.id.productTypeChainTV);
entityNameTV.setText(payloadObject.getString("entityName"));
serialNoTV.setText("#" + payloadObject.getString("serialNumber"));
entityType.setText(payloadObject.getString("entityType"));
getQTYUOM.setText(payloadObject.getString("qtyUOM"));
productTypeChainTV.setText(payloadObject.getString("productDescription"));
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
formatter = new SimpleDateFormat("MMMM yyyy");
String mainChapterNumber = createdDateObj.getString("date").split("\\.", 2)[0];
Log.i("Value iss....", "Value is :: " + mainChapterNumber);
Date date = null;
DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try
date = format.parse(mainChapterNumber);
catch (ParseException e)
e.printStackTrace();
String originStr = null, dateStr = null;
Pattern pattern = Pattern.compile(" ");
Matcher matcher = pattern.matcher(payloadObject.getString("origin") + " " + formatter.format(date));
if (matcher.find())
originStr = payloadObject.getString("origin");
dateStr = formatter.format(date).toString().trim();
originStr = setMultiColor(originStr, "#363636");
dateStr = setMultiColor(dateStr, "#87CEFA");
originTV.setText(html.fromHtml(originStr + " " + dateStr));
ChainItemsAdapter chainItemsAdapter = new ChainItemsAdapter(context, scansList);
// ViewGroup header = (ViewGroup)inflater.inflate(R.layout.chaintab_lv_header,bottleChainListView,false);
bottleChainListView.addHeaderView(view);
bottleChainListView.setAdapter(chainItemsAdapter);
catch (JSONException e)
e.printStackTrace();
// This block is used while implementing the things with chain api url link
/*
try
JSONObject jsonObject = new JSONObject(response.toString());
JSONArray payloadJsonArray = jsonObject.getJSONArray("payload");
for (int i=0; i<payloadJsonArray.length(); i++)
BottleInfoModel bottleInfoModel = new BottleInfoModel();
JSONObject payloadJOBJ = payloadJsonArray.getJSONObject(i);
bottleInfoModel.setLongVal(payloadJOBJ.getString("long"));
bottleInfoModel.setLatVal(payloadJOBJ.getString("lat"));
bottleInfoModel.setEntityName(payloadJOBJ.getString("entityName"));
bottleInfoModel.setSerialNumber(payloadJOBJ.getString("bottleId"));
CreatedAt createdAt = new CreatedAt();
JSONObject jsonObjectCreatedAt = payloadJOBJ.getJSONObject("created_at");
createdAt.setDate(jsonObjectCreatedAt.getString("date"));
createdAt.setTimezone(jsonObjectCreatedAt.getString("timezone"));
createdAt.setTimezone_type(jsonObjectCreatedAt.getString("timezone_type"));
createdAtList.add(createdAt);
bottleInfoModel.setCreatedAtList(createdAtList);
bottleInfoModelList.add(bottleInfoModel);
entityNameTV.setText(bottleInfoModelList.get(0).getEntityName());
serialNoTV.setText(bottleInfoModelList.get(0).getSerialNumber());
ChainItemsAdapter chainItemsAdapter = new ChainItemsAdapter(context, bottleInfoModelList);
bottleChainListView.setAdapter(chainItemsAdapter);;
catch (JSONException e)
e.printStackTrace();
*/
return null;
private String setMultiColor(String text, String color)
String input = "<font color=" + color + ">" + text + "</font>";
return input;
@Override
public JSONObject onResponse(JSONObject response)
return null;
@Override
public void onLocationChanged(Location location)
updateWithNewLocation(location);
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
switch (status)
case LocationProvider.OUT_OF_SERVICE:
break;
case LocationProvider.TEMPORARILY_UNAVAILABLE:
break;
case LocationProvider.AVAILABLE:
break;
@Override
public void onProviderEnabled(String provider)
@Override
public void onProviderDisabled(String provider)
updateWithNewLocation(null);
@Override
public boolean onMarkerClick(Marker marker)
return false;
@Override
public void onMapReady(GoogleMap googleMap)
mMap = googleMap;
// LatLng target = mMap.getCameraPosition().target;
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
addMarks(mMap);
if (isProviderAvailable() && (provider != null))
locateCurrentPosition();
private void locateCurrentPosition()
int status = context.getPackageManager().checkPermission(Manifest.permission.ACCESS_COARSE_LOCATION,
context.getPackageName());
if (status == PackageManager.PERMISSION_GRANTED)
Location location = mLocationManager.getLastKnownLocation(provider);
updateWithNewLocation(location);
// mLocationManager.addGpsStatusListener(this);
long minTime = 5000;// ms
float minDist = 5.0f;// meter
mLocationManager.requestLocationUpdates(provider, minTime, minDist,
this);
private void updateWithNewLocation(Location location)
if (location != null && provider != null)
double lng = location.getLongitude();
double lat = location.getLatitude();
mSourceLatLng = new LatLng(lat, lng);
// addBoundaryToCurrentPosition(lat, lng);
CameraPosition camPosition = new CameraPosition.Builder()
.target(new LatLng(lat, lng)).zoom(8).build();
// mMap.getCameraPosition().target
// if (mMap != null)
// mMap.animateCamera(CameraUpdateFactory
// .newCameraPosition(camPosition));
else
Log.d("Location error", "Something went wrong");
private void addBoundaryToCurrentPosition(double lat, double lang)
MarkerOptions mMarkerOptions = new MarkerOptions();
mMarkerOptions.position(new LatLng(lat, lang));
mMarkerOptions.icon(BitmapDescriptorFactory
.fromResource(R.mipmap.ic_launcher));
mMarkerOptions.anchor(0.5f, 0.5f);
CircleOptions mOptions = new CircleOptions()
.center(new LatLng(lat, lang)).radius(10000)
.strokeColor(0x110000FF).strokeWidth(1).fillColor(0x110000FF);
mMap.addCircle(mOptions);
if (mCurrentPosition != null)
mCurrentPosition.remove();
mCurrentPosition = mMap.addMarker(mMarkerOptions);
private boolean isProviderAvailable()
mLocationManager = (LocationManager) context.getSystemService(
Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
provider = mLocationManager.getBestProvider(criteria, true);
if (mLocationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER))
provider = LocationManager.NETWORK_PROVIDER;
return true;
if (mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
provider = LocationManager.GPS_PROVIDER;
return true;
if (provider != null)
return true;
return false;
private void addMarks(GoogleMap mMap)
// displayResponseVal(responseVal);
List<LatLng> latLngsList = new ArrayList<>();
mMap = mMap;
Polyline polylineOptions = null;
LatLng latLng = null;
// for (int i = 0; i < bottleInfoModelList.size(); i++)
for (int i = 0; i < scansList.size(); i++)
Scans scanInfoModel = scansList.get(i);
double latval, longVal;
try
latval = Double.parseDouble(scanInfoModel.getLat());
longVal = Double.parseDouble(scanInfoModel.getLongVal());
catch (NumberFormatException e)
e.printStackTrace();
latval = 0;
longVal = 0;
latLng = new LatLng(latval, longVal);
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title(scanInfoModel.getEntityName());
mMap.addMarker(markerOptions);
mMap.setOnMarkerClickListener((GoogleMap.OnMarkerClickListener) this);
latLngsList.add(latLng);
drawRouteOnMap(mMap, latLngsList);
private void drawRouteOnMap(GoogleMap mMap, List<LatLng> latLngsList)
PolylineOptions options = new PolylineOptions().width(5).color(Color.BLUE).geodesic(true);
options.addAll(latLngsList);
Polyline polyline = mMap.addPolyline(options);
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(latLngsList.get(0).latitude, latLngsList.get(0).longitude))
.zoom(8)
.build();
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
@Override
public void onAttach(Context context)
super.onAttach(context);
this.context=context;
对应的日志错误
FATAL EXCEPTION: main
Process: winepoc.tw.net.winepoc, PID: 17576
java.lang.IllegalStateException: onGetLayoutInflater() cannot be executed until the Fragment is attached to the FragmentManager.
at android.support.v4.app.Fragment.getLayoutInflater(Fragment.java:1249)
at android.support.v4.app.Fragment.onGetLayoutInflater(Fragment.java:1201)
at android.support.v4.app.Fragment.performGetLayoutInflater(Fragment.java:1231)
at android.support.v4.app.Fragment.getLayoutInflater(Fragment.java:1217)
at winepoc.tw.net.winepoc.fragments.ChainTab.onResponse(ChainTab.java:199)
\at winepoc.tw.net.winepoc.ServerHit$3.onResponse(ServerHit.java:80)
at winepoc.tw.net.winepoc.ServerHit$3.onResponse(ServerHit.java:71)
at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:78)
at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30)
at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:106)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6692)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
【问题讨论】：
显示一些代码你是如何使用它的 【参考方案1】：Activity activity = getActivity();
if(activity != null)
// etc ...
试试这个，我认为你的活动在编码中是空的
【讨论】：
很抱歉，它还在重复。我在列表视图标题中显示地图的片段中添加了 SupportMapFragment 我预计问题的原因是“SupportMapFragment”你能说我该如何处理这个以上是关于重新打开片段时应用程序崩溃的主要内容，如果未能解决你的问题，请参考以下文章
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