读取JSON布尔值 [英] Reading JSON boolean value
本文介绍了读取JSON布尔值的处理方法，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
在我的应用程序中，我的json响应中有一个布尔变量.
In my app I have a boolean variable inside my json response.
[
{
"id" : "001",
"firstName" : "Mark",
"lastName" : "Mason",
"role" : "CEO",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"teamName" : "iOS",
"members" : [
{
"id" : "002",
"firstName" : "Olly",
"lastName" : "Berry",
"role" : "iOS Team Lead",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png",
"teamLead" : true
},
{
"id" : "003",
"firstName" : "James",
"lastName" : "Frost",
"role" : "iOS Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "004",
"firstName" : "Liam",
"lastName" : "Nichols",
"role" : "iOS Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "005",
"firstName" : "Chris",
"lastName" : "Watson",
"role" : "iOS Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "006",
"firstName" : "Richard",
"lastName" : "Turton",
"role" : "iOS Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "007",
"firstName" : "Matt",
"lastName" : "Colliss",
"role" : "iOS Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "008",
"firstName" : "David",
"lastName" : "Gibson",
"role" : "iOS Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "009",
"firstName" : "Tom",
"lastName" : "Guy",
"role" : "iOS Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "010",
"firstName" : "Rich",
"lastName" : "Hodgkins",
"role" : "iOS Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
}
]
},
{
"teamName" : "Android",
"members" : [{
"id" : "011",
"firstName" : "David",
"lastName" : "Branton",
"role" : "Android Team Lead",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png",
"teamLead" : true
},
{
"id" : "012",
"firstName" : "Dre",
"lastName" : "Pilipczuk",
"role" : "Android Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "013",
"firstName" : "Ray",
"lastName" : "Britton",
"role" : "Android Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "014",
"firstName" : "Charly",
"lastName" : "Murillo",
"role" : "Android Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
}
]
},
{
"teamName" : "Web",
"members" : [{
"id" : "015",
"firstName" : "Ryan",
"lastName" : "French",
"role" : "Web Team Lead",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png",
"teamLead" : true
},
{
"id" : "016",
"firstName" : "James",
"lastName" : "Ward",
"role" : "Web Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "018",
"firstName" : "Adam",
"lastName" : "Smith",
"role" : "Web Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "019",
"firstName" : "Leonard",
"lastName" : "Da Costa",
"role" : "Web Developer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
}
]
},
{
"teamName" : "Design",
"members" : [{
"id" : "020",
"firstName" : "Hannah",
"lastName" : "Tempest",
"role" : "Design Team Lead",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png",
"teamLead" : true
},
{
"id" : "021",
"firstName" : "Ellis",
"lastName" : "Reed",
"role" : "Designer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "022",
"firstName" : "Pete",
"lastName" : "Horsham",
"role" : "Designer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "023",
"firstName" : "Hemel",
"lastName" : "Dave",
"role" : "Designer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
},
{
"id" : "024",
"firstName" : "Hannah",
"lastName" : "Corke",
"role" : "Designer",
"profileImageURL" : "http://developers.mub.lu/resources/profilePlaceholder.png"
}
]
}
]
@Override
public void onResponse(JSONArray response) {
Log.d("Theo", response.toString());
//I use i=1 to bypass the first JSON object which doesn't contain
the object member.
//If i set i=0,then I will get an exception.
for(int i = 1;i<response.length();i++){
try {
//Here I read the 4 objects.
JSONObject jsonObject = response.getJSONObject(i);
//I get the members array for JSON object
JSONArray teamMembersArray = jsonObject.getJSONArray("members");
for(int j=0;j<teamMembersArray.length();j++){
//The model class which contains the setters/getters
//in order to "deserialize" the JSON objects into string objects.
Model m = new Model();
JSONObject teamObject = teamMembersArray.getJSONObject(j);
//I am searching if the teamLead object exists.If yes
//then set it to true by reading it! If not then read
//the next members!
if (teamObject.has("teamLead") && teamObject.isNull("teamLead")) {
m.setTeamLead(teamObject.getBoolean("teamLead"));
}else {
m.setId(teamObject.getInt("id"));
m.setProfileImageURL(teamObject.getString("profileImageURL"));
m.setFirstName(teamObject.getString("firstName"));
m.setLastName(teamObject.getString("lastName"));
m.setRole(teamObject.getString("role"));
//Finally I am adding the string objects into an ArrayList.
modelArrayList.add(m);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
//modelArrayList.add(m);
// Update list by notifying the adapter of changes
myAdapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
//hidePD();
}
});
AppController.getInstance().addToRequestQueue(jsObjRequest);
}
我使用在Model类中创建的setter方法读取它.到目前为止，一切都很好. 现在，我想进入自定义适配器并执行操作，如果该json变量为true(teamLead)，则更改所有相应团队负责人的文本颜色.
I read it using a setter method I created inside my Model class. So far so good. Now i want to go in my custom Adapter and do, if that json variable is true(teamLead),then change the text colours of all corresponding team leaders.
这是我的适配器代码.
This is my Adapter code.
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.RowHolderClass> {
private List<Model> modelList;
private Context mContext;
private int focused;
private ImageLoader mImageLoader;
public MyAdapter(Activity activity,List<Model> modelList) {
this.modelList = modelList;
this.mContext = activity;
}
@Override
public RowHolderClass onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.adapter_row,null);
final RowHolderClass holder = new RowHolderClass(v);
return holder;
}
@Override
public void onBindViewHolder(RowHolderClass holder, int position) {
final Model listItems = modelList.get(position);
holder.itemView.setSelected(focused==position);
holder.getLayoutPosition();
mImageLoader = AppController.getInstance().getImageLoader();
holder.imageView.setImageUrl(listItems.getProfileImageURL(),mImageLoader);
holder.fName.setText(Html.fromHtml(listItems.getFirstName()));
holder.lName.setText(Html.fromHtml(listItems.getLastName()));
holder.jobRole.setText(Html.fromHtml(listItems.getRole()));
holder.teamLeader.booleanValue();
//holder.fName.setTextColor(mContext.getResources().getColor(R.color.textColors));
holder.relativeLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String first_name = listItems.getFirstName();
String last_name = listItems.getLastName();
String job_role = listItems.getRole();
String image_url = listItems.getProfileImageURL();
String id= String.valueOf(listItems.getId());
Intent i = new Intent(mContext, NewActivity.class);
i.putExtra("firstName",first_name);
i.putExtra("lastName",last_name);
i.putExtra("jobRole",job_role);
i.putExtra("imageUrl",image_url);
i.putExtra("memberId",id);
mContext.startActivity(i);
}
});
}
@Override
public int getItemCount() {
return (null != modelList?modelList.size() :0 );
}
//ViewHolder algorithm used to read the data of the row fast.
class RowHolderClass extends RecyclerView.ViewHolder {
protected NetworkImageView imageView;
protected TextView fName, lName, jobRole;
protected RelativeLayout relativeLayout;
protected Boolean teamLeader;
public RowHolderClass(View itemView) {
super(itemView);
this.relativeLayout = (RelativeLayout) itemView.findViewById(R.id.recLayout);
this.imageView = (NetworkImageView) itemView.findViewById(R.id.imageView);
this.fName = (TextView) itemView.findViewById(R.id.firstName);
this.lName = (TextView) itemView.findViewById(R.id.lastName);
this.jobRole = (TextView) itemView.findViewById(R.id.roleView);
}
}
}
如您所见，我得到了我想要的所有值并显示它们.但是我不知道怎么说
As you can see I get all the values I want and get them displayed. But I don't know how to say
if(teamLeader is true){
//then change the text colours of the corresponding team leaders.
}
谢谢
西奥
推荐答案
无需使其变得如此复杂. Json还为我们提供了一种简便的方法，即opt(optString()，optBoolean()，optJsonArray())而不是get(getString()，getBoolean()，getJsonArray()).该选项的作用是，它将检查给定密钥是否存在于您的json字符串中.如果json字符串具有键，它将返回该值，否则默认为Boolean(对于布尔值)为null(或)为false，不会发生Json异常.这将减少不必要的情况.在您的情况下，您已检查"teamLead"布尔对象是否存在，可以很容易地实现，如下所示.
There is no need to make it so complex. Json also gives us a option to do it in a easy way.i.e., opt (optString(), optBoolean(), optJsonArray()) instead of get (getString(), getBoolean(), getJsonArray()). What this opt does is, it will check whether the given key is present in your json string or not. If the json string has the key it will return the value otherwise it will null (or) false for Boolean by default no Json exception will occurs. This will reduce unnecessary if condition's.In your case, you have checked whether the "teamLead" Boolean object exists or not, which can be easily achieved as shown below.
m.setTeamLead(teamObject.optBoolean("teamLead", false));
如果要使用if条件检查布尔值，可以按以下方式进行操作.
If you want to check the Boolean value using if condition, you can do it in the following way.
if (m.getTeamLead()) {
//True
} else {
//False
}
希望这会有所帮助.
这篇关于读取JSON布尔值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
