Android - 如何从改造中获得 json
Android - how to get json from retrofit
我是 Retrofit 的新手，
[
{
"scheme_name": "DSP BlackRock Tax Saver Fund (G)",
"sch_id": "401",
"scheme_code": "D110",
"category_type": "Equity",
"trxntype": "Lumpsum",
"current_value": 570.178,
"folio_no": "3417548/62",
"units": 14.941,
"trnx_date": "10-06-16",
"current_invest": 500,
"gainLoss": 70.18
},
{
"scheme_name": "DSP BlackRock World Mining Fund (G)",
"sch_id": "1278",
"scheme_code": "D341",
"category_type": "Equity",
"trxntype": "Lumpsum",
"current_value": 1999.393,
"folio_no": "3417548/62",
"units": 302.16,
"trnx_date": "21-07-16",
"current_invest": 2000,
"gainLoss": -0.61
},
{
"scheme_name": "ICICI Prudential Savings Fund (G)",
"sch_id": "119",
"scheme_code": "P1543",
"category_type": "Debt",
"trxntype": "Full Redemption",
"current_value": 0,
"folio_no": "8349201/28",
"units": 0,
"trnx_date": "19-07-16",
"current_invest": 0,
"gainLoss": 0
},
{
"scheme_name": "Kotak Emerging Equity Scheme (G)",
"sch_id": "1001",
"scheme_code": "K123",
"category_type": "Equity",
"trxntype": "Lumpsum",
"current_value": 10309.489,
"folio_no": "3625427/38",
"units": 325.796,
"trnx_date": "03-08-16",
"current_invest": 10000,
"gainLoss": 309.49
}
]
这是json是get，
package info.androidhive.retrofit.model;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
import javax.annotation.Generated;
@Generated("org.jsonschema2pojo")
public class MyTransaction {
@SerializedName("scheme_name")
@Expose
private String schemeName;
@SerializedName("sch_id")
@Expose
private String schId;
@SerializedName("scheme_code")
@Expose
private String schemeCode;
@SerializedName("category_type")
@Expose
private String categoryType;
@SerializedName("trxntype")
@Expose
private String trxntype;
@SerializedName("current_value")
@Expose
private Float currentValue;
@SerializedName("folio_no")
@Expose
private String folioNo;
@SerializedName("units")
@Expose
private Float units;
@SerializedName("trnx_date")
@Expose
private String trnxDate;
@SerializedName("current_invest")
@Expose
private Integer currentInvest;
@SerializedName("gainLoss")
@Expose
private Float gainLoss;
public MyTransaction(String schemeName, String schId, String schemeCode, String categoryType, String trxntype, Float currentValue, String folioNo, Float units, String trnxDate, Integer currentInvest, Float gainLoss) {
this.schemeName = schemeName;
this.schId = schId;
this.schemeCode = schemeCode;
this.categoryType = categoryType;
this.trxntype = trxntype;
this.currentValue = currentValue;
this.folioNo = folioNo;
this.units = units;
this.trnxDate = trnxDate;
this.currentInvest = currentInvest;
this.gainLoss = gainLoss;
}
/**
*
* @return
* The schemeName
*/
public String getSchemeName() {
return schemeName;
}
/**
*
* @param schemeName
* The scheme_name
*/
public void setSchemeName(String schemeName) {
this.schemeName = schemeName;
}
/**
*
* @return
* The schId
*/
public String getSchId() {
return schId;
}
/**
*
* @param schId
* The sch_id
*/
public void setSchId(String schId) {
this.schId = schId;
}
/**
*
* @return
* The schemeCode
*/
public String getSchemeCode() {
return schemeCode;
}
/**
*
* @param schemeCode
* The scheme_code
*/
public void setSchemeCode(String schemeCode) {
this.schemeCode = schemeCode;
}
/**
*
* @return
* The categoryType
*/
public String getCategoryType() {
return categoryType;
}
/**
*
* @param categoryType
* The category_type
*/
public void setCategoryType(String categoryType) {
this.categoryType = categoryType;
}
/**
*
* @return
* The trxntype
*/
public String getTrxntype() {
return trxntype;
}
/**
*
* @param trxntype
* The trxntype
*/
public void setTrxntype(String trxntype) {
this.trxntype = trxntype;
}
/**
*
* @return
* The currentValue
*/
public Float getCurrentValue() {
return currentValue;
}
/**
*
* @param currentValue
* The current_value
*/
public void setCurrentValue(Float currentValue) {
this.currentValue = currentValue;
}
/**
*
* @return
* The folioNo
*/
public String getFolioNo() {
return folioNo;
}
/**
*
* @param folioNo
* The folio_no
*/
public void setFolioNo(String folioNo) {
this.folioNo = folioNo;
}
/**
*
* @return
* The units
*/
public Float getUnits() {
return units;
}
/**
*
* @param units
* The units
*/
public void setUnits(Float units) {
this.units = units;
}
/**
*
* @return
* The trnxDate
*/
public String getTrnxDate() {
return trnxDate;
}
/**
*
* @param trnxDate
* The trnx_date
*/
public void setTrnxDate(String trnxDate) {
this.trnxDate = trnxDate;
}
/**
*
* @return
* The currentInvest
*/
public Integer getCurrentInvest() {
return currentInvest;
}
/**
*
* @param currentInvest
* The current_invest
*/
public void setCurrentInvest(Integer currentInvest) {
this.currentInvest = currentInvest;
}
/**
*
* @return
* The gainLoss
*/
public Float getGainLoss() {
return gainLoss;
}
/**
*
* @param gainLoss
* The gainLoss
*/
public void setGainLoss(Float gainLoss) {
this.gainLoss = gainLoss;
}
}
以上为模型class。
Api 客户端代码
public static final String BASE_URL = "http://www.mysiponline.com/admin-panel/AndroidApi/";
private static Retrofit retrofit = null;
public static Retrofit getClient() {
if (retrofit==null) {
retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit;
}
AIP接口代码
@POST("client_trans/{user_id}")
Call<MyTransaction> getTransaction(@Path("user_id") String id);
MainActivity 代码
Call<MyTransaction> myTransactionCall = apiService.getTransaction("420");
myTransactionCall.enqueue(new Callback<MyTransaction>() {
@Override
public void onResponse(Call<MyTransaction> call, Response<MyTransaction> response) {
Log.e(TAG, "Partners list : response.body());
}
@Override
public void onFailure(Call<MyTransaction> call, Throwable t) {
}
});
mainActivity 代码出错。我无法得到它。请帮助并提前致谢。
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException
at info.androidhive.retrofit.activity.MainActivity.onResponse(MainActivity.java:65)
at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall.run(ExecutorCallAdapterFactory.java:68)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
您正在调用单个对象，但服务器返回给您对象列表。
@POST("client_trans/{user_id}")
Call<List<MyTransaction>> getTransaction(@Path("user_id") String id);
也在这里编辑
Call<List<MyTransaction>> myTransactionCall = apiService.getTransaction("420");
myTransactionCall.enqueue(new Callback<List<MyTransaction>>() {
@Override
public void onResponse(Response<List<MyTransaction>> response) {
if(response.code()!=200){
Log.d("Error",response.code()+"");
return;
}
for(MyTransaction data: response.body){
Log.d("Name",data.getSchemeName()+"");
}
Log.e(TAG, "Partners list : response.body());
}
@Override
public void onFailure(Throwable t) {
}
});
这是解决方案。将AIP接口的代码改成这个
@FormUrlEncoded
@POST("client_trans")
Call<List<Example>> getTransaction(@Field("user_id") String user_id);
MainActivity 调用api函数的代码
Call<List<MyTransaction>> listCall = apiService.getTransaction("420");
listCall.enqueue(new Callback<List<MyTransaction>>() {
@Override
public void onResponse(Call<List<MyTransaction>> call, Response<List<MyTransaction>> response) {
List<MyTransaction> examples = response.body();
Log.e(TAG, "Response : " + response.body());// Response : null
for (int i = 0; i < examples.size(); i++) {
Log.e(TAG, "examples list : " + examples.get(i).categoryType);
}
}
@Override
public void onFailure(Call<List<Example>> call, Throwable t) {
}
});
编码愉快。
我是 Retrofit 的新手，
[
{
"scheme_name": "DSP BlackRock Tax Saver Fund (G)",
"sch_id": "401",
"scheme_code": "D110",
"category_type": "Equity",
"trxntype": "Lumpsum",
"current_value": 570.178,
"folio_no": "3417548/62",
"units": 14.941,
"trnx_date": "10-06-16",
"current_invest": 500,
"gainLoss": 70.18
},
{
"scheme_name": "DSP BlackRock World Mining Fund (G)",
"sch_id": "1278",
"scheme_code": "D341",
"category_type": "Equity",
"trxntype": "Lumpsum",
"current_value": 1999.393,
"folio_no": "3417548/62",
"units": 302.16,
"trnx_date": "21-07-16",
"current_invest": 2000,
"gainLoss": -0.61
},
{
"scheme_name": "ICICI Prudential Savings Fund (G)",
"sch_id": "119",
"scheme_code": "P1543",
"category_type": "Debt",
"trxntype": "Full Redemption",
"current_value": 0,
"folio_no": "8349201/28",
"units": 0,
"trnx_date": "19-07-16",
"current_invest": 0,
"gainLoss": 0
},
{
"scheme_name": "Kotak Emerging Equity Scheme (G)",
"sch_id": "1001",
"scheme_code": "K123",
"category_type": "Equity",
"trxntype": "Lumpsum",
"current_value": 10309.489,
"folio_no": "3625427/38",
"units": 325.796,
"trnx_date": "03-08-16",
"current_invest": 10000,
"gainLoss": 309.49
}
]
这是json是get，
package info.androidhive.retrofit.model;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
import javax.annotation.Generated;
@Generated("org.jsonschema2pojo")
public class MyTransaction {
@SerializedName("scheme_name")
@Expose
private String schemeName;
@SerializedName("sch_id")
@Expose
private String schId;
@SerializedName("scheme_code")
@Expose
private String schemeCode;
@SerializedName("category_type")
@Expose
private String categoryType;
@SerializedName("trxntype")
@Expose
private String trxntype;
@SerializedName("current_value")
@Expose
private Float currentValue;
@SerializedName("folio_no")
@Expose
private String folioNo;
@SerializedName("units")
@Expose
private Float units;
@SerializedName("trnx_date")
@Expose
private String trnxDate;
@SerializedName("current_invest")
@Expose
private Integer currentInvest;
@SerializedName("gainLoss")
@Expose
private Float gainLoss;
public MyTransaction(String schemeName, String schId, String schemeCode, String categoryType, String trxntype, Float currentValue, String folioNo, Float units, String trnxDate, Integer currentInvest, Float gainLoss) {
this.schemeName = schemeName;
this.schId = schId;
this.schemeCode = schemeCode;
this.categoryType = categoryType;
this.trxntype = trxntype;
this.currentValue = currentValue;
this.folioNo = folioNo;
this.units = units;
this.trnxDate = trnxDate;
this.currentInvest = currentInvest;
this.gainLoss = gainLoss;
}
/**
*
* @return
* The schemeName
*/
public String getSchemeName() {
return schemeName;
}
/**
*
* @param schemeName
* The scheme_name
*/
public void setSchemeName(String schemeName) {
this.schemeName = schemeName;
}
/**
*
* @return
* The schId
*/
public String getSchId() {
return schId;
}
/**
*
* @param schId
* The sch_id
*/
public void setSchId(String schId) {
this.schId = schId;
}
/**
*
* @return
* The schemeCode
*/
public String getSchemeCode() {
return schemeCode;
}
/**
*
* @param schemeCode
* The scheme_code
*/
public void setSchemeCode(String schemeCode) {
this.schemeCode = schemeCode;
}
/**
*
* @return
* The categoryType
*/
public String getCategoryType() {
return categoryType;
}
/**
*
* @param categoryType
* The category_type
*/
public void setCategoryType(String categoryType) {
this.categoryType = categoryType;
}
/**
*
* @return
* The trxntype
*/
public String getTrxntype() {
return trxntype;
}
/**
*
* @param trxntype
* The trxntype
*/
public void setTrxntype(String trxntype) {
this.trxntype = trxntype;
}
/**
*
* @return
* The currentValue
*/
public Float getCurrentValue() {
return currentValue;
}
/**
*
* @param currentValue
* The current_value
*/
public void setCurrentValue(Float currentValue) {
this.currentValue = currentValue;
}
/**
*
* @return
* The folioNo
*/
public String getFolioNo() {
return folioNo;
}
/**
*
* @param folioNo
* The folio_no
*/
public void setFolioNo(String folioNo) {
this.folioNo = folioNo;
}
/**
*
* @return
* The units
*/
public Float getUnits() {
return units;
}
/**
*
* @param units
* The units
*/
public void setUnits(Float units) {
this.units = units;
}
/**
*
* @return
* The trnxDate
*/
public String getTrnxDate() {
return trnxDate;
}
/**
*
* @param trnxDate
* The trnx_date
*/
public void setTrnxDate(String trnxDate) {
this.trnxDate = trnxDate;
}
/**
*
* @return
* The currentInvest
*/
public Integer getCurrentInvest() {
return currentInvest;
}
/**
*
* @param currentInvest
* The current_invest
*/
public void setCurrentInvest(Integer currentInvest) {
this.currentInvest = currentInvest;
}
/**
*
* @return
* The gainLoss
*/
public Float getGainLoss() {
return gainLoss;
}
/**
*
* @param gainLoss
* The gainLoss
*/
public void setGainLoss(Float gainLoss) {
this.gainLoss = gainLoss;
}
}
以上为模型class。 Api 客户端代码
public static final String BASE_URL = "http://www.mysiponline.com/admin-panel/AndroidApi/";
private static Retrofit retrofit = null;
public static Retrofit getClient() {
if (retrofit==null) {
retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit;
}
AIP接口代码
@POST("client_trans/{user_id}")
Call<MyTransaction> getTransaction(@Path("user_id") String id);
MainActivity 代码
Call<MyTransaction> myTransactionCall = apiService.getTransaction("420");
myTransactionCall.enqueue(new Callback<MyTransaction>() {
@Override
public void onResponse(Call<MyTransaction> call, Response<MyTransaction> response) {
Log.e(TAG, "Partners list : response.body());
}
@Override
public void onFailure(Call<MyTransaction> call, Throwable t) {
}
});
mainActivity 代码出错。我无法得到它。请帮助并提前致谢。
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException
at info.androidhive.retrofit.activity.MainActivity.onResponse(MainActivity.java:65)
at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall.run(ExecutorCallAdapterFactory.java:68)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
您正在调用单个对象，但服务器返回给您对象列表。
@POST("client_trans/{user_id}")
Call<List<MyTransaction>> getTransaction(@Path("user_id") String id);
也在这里编辑
Call<List<MyTransaction>> myTransactionCall = apiService.getTransaction("420");
myTransactionCall.enqueue(new Callback<List<MyTransaction>>() {
@Override
public void onResponse(Response<List<MyTransaction>> response) {
if(response.code()!=200){
Log.d("Error",response.code()+"");
return;
}
for(MyTransaction data: response.body){
Log.d("Name",data.getSchemeName()+"");
}
Log.e(TAG, "Partners list : response.body());
}
@Override
public void onFailure(Throwable t) {
}
});
这是解决方案。将AIP接口的代码改成这个
@FormUrlEncoded
@POST("client_trans")
Call<List<Example>> getTransaction(@Field("user_id") String user_id);
MainActivity 调用api函数的代码
Call<List<MyTransaction>> listCall = apiService.getTransaction("420");
listCall.enqueue(new Callback<List<MyTransaction>>() {
@Override
public void onResponse(Call<List<MyTransaction>> call, Response<List<MyTransaction>> response) {
List<MyTransaction> examples = response.body();
Log.e(TAG, "Response : " + response.body());// Response : null
for (int i = 0; i < examples.size(); i++) {
Log.e(TAG, "examples list : " + examples.get(i).categoryType);
}
}
@Override
public void onFailure(Call<List<Example>> call, Throwable t) {
}
});
编码愉快。