如何使用 Gson 传递 json 对象数据?

本文介绍了如何使用 Gson 传递 json 对象数据?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我知道有很多可用的解决方案，但没有一个能帮助我我正在使用 Gson 解析 json 数据数据，我也想将此数据解析为另一个活动，但我遇到了空指针异常.

i know there is lots of solution available but none of them help me i am parsing json data data using Gson, and i want to parse this data to another activity as well but i am getting null pointer exception on that.

RequestQueue requestQueue = Volley.newRequestQueue(mContext); JsonObjectRequest jsOnbjRequest = new JsonObjectRequest(Request.Method.POST, Constants.MyProfile, userProfile, new Response.Listener<JSONObject>() { @Override public void onResponse(JSONObject response) { // Toast.makeText(mContext, response.toString(), Toast.LENGTH_SHORT).show(); progressDialog.dismiss(); Gson mGson=new Gson(); mMyProfile=mGson.fromJson(response.toString(),MyProfile.class); firstNameView.setText(mMyProfile.getMyProfileDTO().get(0).getFirstName()); lashNameView.setText(mMyProfile.getMyProfileDTO().get(0).getLastName()); adressNameView.setText(mMyProfile.getMyProfileDTO().get(0).getAddress()); countryNameView.setText(mMyProfile.getMyProfileDTO().get(0).getCountry()); zipCodeView.setText(mMyProfile.getMyProfileDTO().get(0).getZipCode()); emailIdView.setText(mMyProfile.getMyProfileDTO().get(0).getEmail()); phonNoview.setText(mMyProfile.getMyProfileDTO().get(0).getPhoneNumber()); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { progressDialog.dismiss(); Toast.makeText(mContext, "ErrorMsg" + error.toString(), Toast.LENGTH_SHORT).show(); } }); requestQueue.add(jsOnbjRequest); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.edit_profile, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.action_edit: if (Connectivity.isConnected(mContext)) { /*Intent userEditProfile = new Intent(mContext, EditProfileActivity.class); userEditProfile.putExtra("userProfile",mMyProfile); startActivity(userEditProfile); overridePendingTransition(R.anim.right_to_left, R.anim.left_to_right);*/ Intent intent = new Intent(getBaseContext(), EditProfileActivity.class); intent.putExtra("profile ", mMyProfile); startActivity(intent); } else { Connectivity.showNoConnection(mContext); } break; } return super.onOptionsItemSelected(item); }

在解析这些数据时，我无法获得解析对象，因为我的下一个活动是这样的:

while parsing this data i am not able to get parsing object on that my next Activity is like:

MyProfile object = getIntent().getExtras().getParcelable("profile"); userFirstName=object.getMyProfileDTO().get(0).getFirstName();

并在 bean 类上记录 cat 点:

and log cat point on bean class:

public class MyProfile implements Parcelable { @SerializedName("Status") @Expose private String status; @SerializedName("Message") @Expose private String message; @SerializedName("myProfileDTO") @Expose private List<MyProfileDTO> myProfileDTO = null; public final static Parcelable.Creator<MyProfile> CREATOR = new Creator<MyProfile>() { @SuppressWarnings({ "unchecked" }) public MyProfile createFromParcel(Parcel in) { return new MyProfile(in); } public MyProfile[] newArray(int size) { return (new MyProfile[size]); } } ; protected MyProfile(Parcel in) { this.status = ((String) in.readValue((String.class.getClassLoader()))); this.message = ((String) in.readValue((String.class.getClassLoader()))); in.readList(this.myProfileDTO, (MyProfileDTO.class.getClassLoader()));//here null pointer exception } public MyProfile() { } public String getStatus() { return status; } public void setStatus(String status) { this.status = status; } public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } public List<MyProfileDTO> getMyProfileDTO() { return myProfileDTO; } public void setMyProfileDTO(List<MyProfileDTO> myProfileDTO) { this.myProfileDTO = myProfileDTO; } public void writeToParcel(Parcel dest, int flags) { dest.writeValue(status); dest.writeValue(message); dest.writeList(myProfileDTO); } public int describeContents() { return 0; } }

推荐答案

让你的 MyProfile.class 实现 Serializable

确保你的响应是 json 格式，然后在 volley 的 onResponse() 中使用 GsonBuilder() 像这样

make sure your response is in json format and then in onResponse() of volley use GsonBuilder() like this

MyProfile myprofile = new GsonBuilder().create().fromJson(response.toString(), MyProfile .class);

然后开始有意图的活动

Intent i = new Intent(this, NextActivity.class); i.putExtra("myprofileObject", myprofile ); startActivity(i);

并像这样接收NextActivity.class中的对象

Intent intent = getIntent(); MyProfile myprofile = (MyProfile )intent .getSerializableExtra("myprofileObject");

如果你将你的类实现为 Parcelable 然后像这样在 NextActivity.class 中接收对象

If you implement your class as Parcelable then receive the object in NextActivity.class like this

Intent intent = getIntent(); MyProfile myprofile = (MyProfile )intent .getParcelableExtra("myprofileObject");