Krish
Reputation: 4242
JSON Parsing with Gson in Android
Hi I am trying to Parsing JSON object with using Gson and for this I wrote the code bellow, but when I run my app I am getting an Exception:
java.lang.NullPointerException: Attempt to invoke virtual method 'com.example.venkat.checkingservicesexample2.TerritoryBean com.example.venkat.checkingservicesexample2.Header.getAlerts()' on a null object reference
Json Object response:-
{
"Header": {
"CutQuantity": 0,
"ETAQuantity": 0,
"IDRPrice": 229000,
"MasterId": 65639,
"Name": "VENICE SATIN DBY 21491 COL 25894",
"POQuantity": 0,
"ProductCode": "GG01054-14B",
"QtyOnHand": 332.1,
"ReservedQuantity": "332.1",
"SellingPrice": 229000,
"TotalAvlQuantity": 0,
"USDPrice": 26
},
"Batches": [{
"AvailableQty": 25.8,
"BatchNo": "A001",
"BinId": 128430,
"BinName": "Dummy-700",
"DeptId": 23,
"DeptName": "G.700",
"MaxBodyId": 128430,
"ProductCode": "GG01054-14B",
"ProductCodeBatch": "GG01054-14B-A001",
"ProductId": 65639,
"ProductName": "VENICE SATIN DBY 21491 COL 25894"
}, {
"AvailableQty": 40,
"BatchNo": "A002",
"BinId": 128433,
"BinName": "Dummy-700",
"DeptId": 23,
"DeptName": "G.700",
"MaxBodyId": 128433,
"ProductCode": "GG01054-14B",
"ProductCodeBatch": "GG01054-14B-A002",
"ProductId": 65639,
"ProductName": "VENICE SATIN DBY 21491 COL 25894"
}]
}
MainActivity:-
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
getAllTips();
}
private void getAllTips() {
try {
JSONObject json = new JSONObject();
json.put("scancode", "GG01054-14B");
if (CommonUtilities.isNetWorkStateAvailble(MainActivity.this)) {
AsyncTaskClass task = new AsyncTaskClass(this, MainActivity.this,
json);
task.execute(ServiceUrl.GET_STOCKDETAILS_ID_URL, "1",
"");
} else {
Log.d("==========>", "There is Network Error");
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void doPostExecute(StatusObject statusObject) {
// TODO Auto-generated method stub
if (statusObject != null) {
if (statusObject.getResponseCode() == 401) {
Log.d("==========>", "Session Has been Expired");
} else if (statusObject.getResponseCode() == 200) {
handleResponseData(statusObject.getMessage());
} else {
Log.d("==========>", "Server not responding. Please try again later.");
}
} else {
Log.d("==========>", "Server not responding. Please try again later.");
}
}
// handle the response
private void handleResponseData(String result) {
Log.d("Final is==========>", result);
if (result != null) {
try {
JSONObject json = new JSONObject(result);
if (json.has("Header")) {
if (json.getString("Header").equalsIgnoreCase("null")
|| json.getString("Header") == null) {
CommonUtilities
.showToastMessage(MainActivity.this,
"Product Information unavailable with this Barcode");
} else {
System.out.println("your here");
handleTripsResponse(result);
}
} else if (json.has("error")) {
if (json.has("message")) {
CommonUtilities.showToastMessage(MainActivity.this,
"" + json.getString("message"));
}
}
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} else {
CommonUtilities.showToastMessage(MainActivity.this,
"Product Information unavailable with this Barcode");
}
}
// handle the json array data
private void handleTripsResponse(String result) {
try {
Type type = new TypeToken<Response>() {
}.getType();
GsonBuilder gsonBuilder = new GsonBuilder();
Gson gson = gsonBuilder.create();
Response post = gson.fromJson(result,type);
System.out.println("Response is"+post);
friendArrayList.add(post);
int listSize = friendArrayList.size();
Log.d("ADebugTag", "Value: " + Float.toString(listSize));
if (friendArrayList.size() != 0) {
Log.d("=======>" ," data Available");
listView = (ListView) findViewById(R.id.list);
adapter = new CustomListViewAdapter(MainActivity.this,
R.layout.list_item, friendArrayList);
listView.setAdapter(adapter);
}else{
Log.d("=======>" ,"No data Available");
}
} catch (Throwable throwable) {
System.out.println("Exception is " + throwable);
}
}
}
CustomListViewAdapter:-
public class CustomListViewAdapter extends ArrayAdapter<Response> {
LayoutInflater inflater;
Context context;
ArrayList<Response> coridersList = new ArrayList<Response>();
public CustomListViewAdapter(Activity context, int resourceId,
ArrayList<Response> items) {
super(context,resourceId, items);
this.context = context;
inflater = context.getLayoutInflater();
this.coridersList = items;
}
@Override
public View getView(final int position, View view, ViewGroup parent) {
Response rowItem = getItem(position);
System.out.println("rowItem is"+rowItem);
View rowView= inflater.inflate(R.layout.list_item, null, true);
TextView txtTitle = (TextView) rowView.findViewById(R.id.title);
txtTitle.setText(rowItem.getHeader().getAlerts().getDeptName());
TextView desc = (TextView) rowView.findViewById(R.id.desc);
desc.setText(rowItem.getHeader().getAlerts().getProductCode());
// ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
// imageView.setImageResource(rowItem.getImageId());
return rowView;
}
}
Response:-
public class Response {
private Header header;
public Header getHeader(){
return header;
}
public void setHeader(Header header){
this.header = header;
}
}
Header:-
public class Header {
private TerritoryBean alerts;
private String Name;
private String ProductCode;
private int MasterId;
private int SellingPrice;
private int IDRPrice;
private int USDPrice;
private int POQuantity;
private int ReservedQuantity;
private float ETAQuantity;
private float CutQuantity;
private float TotalAvlQuantity;
private float QtyOnHand;
public TerritoryBean getAlerts(){
return alerts;
}
public void setAlerts(TerritoryBean alerts){
this.alerts = alerts;
}
public String getName(){
return Name;
}
public void setName(String Name){
this.Name = Name;
}
public String getProductCode(){
return ProductCode;
}
public void setProductCode(String ProductCode){
this.ProductCode = ProductCode;
}
}
TerritoryBean:-
--
public class TerritoryBean {
private int DeptId;
private String DeptName;
private int ProductId;
private String ProductCode;
private String ProductName;
private String BatchNo;
private String ProductCodeBatch;
private int MaxBodyId;
private float AvailableQty;
private String BinId;
private String BinName;
public int getDeptId(){
return DeptId;
}
public void setDeptId(int DeptId){
this.DeptId = DeptId;
}
public String getDeptName(){
return DeptName;
}
public void setDeptName(String DeptName){
this.DeptName = DeptName;
}
public int getProductId(){
return ProductId;
}
public void setProductId(int ProductId){
this.ProductId = ProductId;
}
public String getProductCode(){
return ProductCode;
}
public void setProductCode(String ProductCode){
this.ProductCode = ProductCode;
}
public String getProductName(){
return ProductName;
}
public void setProductName(String ProductName){
this.ProductName = ProductName;
}
}
Upvotes: 1
Views: 458
Answers (1)
Umesh Singh Kushwaha
Reputation: 5741
You response POJO is wrong and TerritoryBean does not part of Header object.
Batch.java
public class Batch {
@SerializedName("AvailableQty")
@Expose
private Double AvailableQty;
@SerializedName("BatchNo")
@Expose
private String BatchNo;
@SerializedName("BinId")
@Expose
private Integer BinId;
@SerializedName("BinName")
@Expose
private String BinName;
@SerializedName("DeptId")
@Expose
private Integer DeptId;
@SerializedName("DeptName")
@Expose
private String DeptName;
@SerializedName("MaxBodyId")
@Expose
private Integer MaxBodyId;
@SerializedName("ProductCode")
@Expose
private String ProductCode;
@SerializedName("ProductCodeBatch")
@Expose
private String ProductCodeBatch;
@SerializedName("ProductId")
@Expose
private Integer ProductId;
@SerializedName("ProductName")
@Expose
private String ProductName;
/**
*
* @return
* The AvailableQty
*/
public Double getAvailableQty() {
return AvailableQty;
}
/**
*
* @param AvailableQty
* The AvailableQty
*/
public void setAvailableQty(Double AvailableQty) {
this.AvailableQty = AvailableQty;
}
/**
*
* @return
* The BatchNo
*/
public String getBatchNo() {
return BatchNo;
}
/**
*
* @param BatchNo
* The BatchNo
*/
public void setBatchNo(String BatchNo) {
this.BatchNo = BatchNo;
}
/**
*
* @return
* The BinId
*/
public Integer getBinId() {
return BinId;
}
/**
*
* @param BinId
* The BinId
*/
public void setBinId(Integer BinId) {
this.BinId = BinId;
}
/**
*
* @return
* The BinName
*/
public String getBinName() {
return BinName;
}
/**
*
* @param BinName
* The BinName
*/
public void setBinName(String BinName) {
this.BinName = BinName;
}
/**
*
* @return
* The DeptId
*/
public Integer getDeptId() {
return DeptId;
}
/**
*
* @param DeptId
* The DeptId
*/
public void setDeptId(Integer DeptId) {
this.DeptId = DeptId;
}
/**
*
* @return
* The DeptName
*/
public String getDeptName() {
return DeptName;
}
/**
*
* @param DeptName
* The DeptName
*/
public void setDeptName(String DeptName) {
this.DeptName = DeptName;
}
/**
*
* @return
* The MaxBodyId
*/
public Integer getMaxBodyId() {
return MaxBodyId;
}
/**
*
* @param MaxBodyId
* The MaxBodyId
*/
public void setMaxBodyId(Integer MaxBodyId) {
this.MaxBodyId = MaxBodyId;
}
/**
*
* @return
* The ProductCode
*/
public String getProductCode() {
return ProductCode;
}
/**
*
* @param ProductCode
* The ProductCode
*/
public void setProductCode(String ProductCode) {
this.ProductCode = ProductCode;
}
/**
*
* @return
* The ProductCodeBatch
*/
public String getProductCodeBatch() {
return ProductCodeBatch;
}
/**
*
* @param ProductCodeBatch
* The ProductCodeBatch
*/
public void setProductCodeBatch(String ProductCodeBatch) {
this.ProductCodeBatch = ProductCodeBatch;
}
/**
*
* @return
* The ProductId
*/
public Integer getProductId() {
return ProductId;
}
/**
*
* @param ProductId
* The ProductId
*/
public void setProductId(Integer ProductId) {
this.ProductId = ProductId;
}
/**
*
* @return
* The ProductName
*/
public String getProductName() {
return ProductName;
}
/**
*
* @param ProductName
* The ProductName
*/
public void setProductName(String ProductName) {
this.ProductName = ProductName;
}
}
Header.java
public class Header {
@SerializedName("CutQuantity")
@Expose
private Integer CutQuantity;
@SerializedName("ETAQuantity")
@Expose
private Integer ETAQuantity;
@SerializedName("IDRPrice")
@Expose
private Integer IDRPrice;
@SerializedName("MasterId")
@Expose
private Integer MasterId;
@SerializedName("Name")
@Expose
private String Name;
@SerializedName("POQuantity")
@Expose
private Integer POQuantity;
@SerializedName("ProductCode")
@Expose
private String ProductCode;
@SerializedName("QtyOnHand")
@Expose
private Double QtyOnHand;
@SerializedName("ReservedQuantity")
@Expose
private String ReservedQuantity;
@SerializedName("SellingPrice")
@Expose
private Integer SellingPrice;
@SerializedName("TotalAvlQuantity")
@Expose
private Integer TotalAvlQuantity;
@SerializedName("USDPrice")
@Expose
private Integer USDPrice;
/**
*
* @return
* The CutQuantity
*/
public Integer getCutQuantity() {
return CutQuantity;
}
/**
*
* @param CutQuantity
* The CutQuantity
*/
public void setCutQuantity(Integer CutQuantity) {
this.CutQuantity = CutQuantity;
}
/**
*
* @return
* The ETAQuantity
*/
public Integer getETAQuantity() {
return ETAQuantity;
}
/**
*
* @param ETAQuantity
* The ETAQuantity
*/
public void setETAQuantity(Integer ETAQuantity) {
this.ETAQuantity = ETAQuantity;
}
/**
*
* @return
* The IDRPrice
*/
public Integer getIDRPrice() {
return IDRPrice;
}
/**
*
* @param IDRPrice
* The IDRPrice
*/
public void setIDRPrice(Integer IDRPrice) {
this.IDRPrice = IDRPrice;
}
/**
*
* @return
* The MasterId
*/
public Integer getMasterId() {
return MasterId;
}
/**
*
* @param MasterId
* The MasterId
*/
public void setMasterId(Integer MasterId) {
this.MasterId = MasterId;
}
/**
*
* @return
* The Name
*/
public String getName() {
return Name;
}
/**
*
* @param Name
* The Name
*/
public void setName(String Name) {
this.Name = Name;
}
/**
*
* @return
* The POQuantity
*/
public Integer getPOQuantity() {
return POQuantity;
}
/**
*
* @param POQuantity
* The POQuantity
*/
public void setPOQuantity(Integer POQuantity) {
this.POQuantity = POQuantity;
}
/**
*
* @return
* The ProductCode
*/
public String getProductCode() {
return ProductCode;
}
/**
*
* @param ProductCode
* The ProductCode
*/
public void setProductCode(String ProductCode) {
this.ProductCode = ProductCode;
}
/**
*
* @return
* The QtyOnHand
*/
public Double getQtyOnHand() {
return QtyOnHand;
}
/**
*
* @param QtyOnHand
* The QtyOnHand
*/
public void setQtyOnHand(Double QtyOnHand) {
this.QtyOnHand = QtyOnHand;
}
/**
*
* @return
* The ReservedQuantity
*/
public String getReservedQuantity() {
return ReservedQuantity;
}
/**
*
* @param ReservedQuantity
* The ReservedQuantity
*/
public void setReservedQuantity(String ReservedQuantity) {
this.ReservedQuantity = ReservedQuantity;
}
/**
*
* @return
* The SellingPrice
*/
public Integer getSellingPrice() {
return SellingPrice;
}
/**
*
* @param SellingPrice
* The SellingPrice
*/
public void setSellingPrice(Integer SellingPrice) {
this.SellingPrice = SellingPrice;
}
/**
*
* @return
* The TotalAvlQuantity
*/
public Integer getTotalAvlQuantity() {
return TotalAvlQuantity;
}
/**
*
* @param TotalAvlQuantity
* The TotalAvlQuantity
*/
public void setTotalAvlQuantity(Integer TotalAvlQuantity) {
this.TotalAvlQuantity = TotalAvlQuantity;
}
/**
*
* @return
* The USDPrice
*/
public Integer getUSDPrice() {
return USDPrice;
}
/**
*
* @param USDPrice
* The USDPrice
*/
public void setUSDPrice(Integer USDPrice) {
this.USDPrice = USDPrice;
}
}
Response.java
public class Response {
@SerializedName("Header")
@Expose
private com.example.Header Header;
@SerializedName("Batches")
@Expose
private List<Batch> Batches = new ArrayList<Batch>();
/**
*
* @return
* The Header
*/
public com.example.Header getHeader() {
return Header;
}
/**
*
* @param Header
* The Header
*/
public void setHeader(com.example.Header Header) {
this.Header = Header;
}
/**
*
* @return
* The Batches
*/
public List<Batch> getBatches() {
return Batches;
}
/**
*
* @param Batches
* The Batches
*/
public void setBatches(List<Batch> Batches) {
this.Batches = Batches;
}
}
Now use this Response.java
To generate java POJO corresponding to JSON use http://www.jsonschema2pojo.org/
Adding Custom Adapter
public class CustomListViewAdapter extends ArrayAdapter<Batch> {
LayoutInflater inflater;
Context context;
ArrayList<Batch> batchList = new ArrayList<Batch>();
public CustomListViewAdapter(Activity context, int resourceId,
ArrayList<Batch> batchList) {
super(context,resourceId, items);
this.context = context;
inflater = context.getLayoutInflater();
this.batchList = items;
}
@Override
public View getView(final int position, View view, ViewGroup parent) {
Batch batch = batchList.get(position);
System.out.println("rowItem is"+rowItem);
View rowView= inflater.inflate(R.layout.list_item, null, true);
TextView txtTitle = (TextView) rowView.findViewById(R.id.title);
txtTitle.setText(batch.getDeptName());
TextView desc = (TextView) rowView.findViewById(R.id.desc);
desc.setText(batch.getProductCode());
// ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
// imageView.setImageResource(rowItem.getImageId());
return rowView;
}
}
Upvotes: 1
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