如何制作Json格式的数据
利用Google 提供的gson-2.2.4.jar，
public class TestJson {
public static void main(String[] args) {
Result result = new Result();
result.setResult(1);
List<People> peoples = new ArrayList<>();
People people1 = new People();
people1.setName("jack");
people1.setAge(13);
people1.setUrl("http://hiphotos.baidu.com/9_6kis/pic/item/3b8fe9df2b11c37695ee37c4.jpg");
List<SchoolInfo> schoolInfo1 = new ArrayList<>();
SchoolInfo school1 = new SchoolInfo();
school1.setSchool_name("清华");
schoolInfo1.add(school1 );
SchoolInfo school2 = new SchoolInfo();
school2.setSchool_name("北大");
schoolInfo1.add(school2 );
people1.setSchoolInfo(schoolInfo1 );
peoples.add(people1);
People people2 = new People();
people2.setName("rose");
people2.setAge(13);
people2.setUrl("http://hiphotos.baidu.com/a03713106460/pic/item/772181666066aa0faa184c1d.jpg");
List<SchoolInfo> schoolInfo2 = new ArrayList<>();
SchoolInfo school3 = new SchoolInfo();
school3.setSchool_name("人大");
schoolInfo2.add(school3 );
SchoolInfo school4 = new SchoolInfo();
school4.setSchool_name("交大");
schoolInfo2.add(school4 );
people2.setSchoolInfo(schoolInfo2 );
peoples.add(people2);
result.setPersonData(peoples);
Gson gson = new Gson();
System.out.println(gson.toJson(result));
}
}
制作完成的Json数据放入http://www.bejson.com网站中格式化验证
结果：
{
"result": 1,
"personData": [
{
"name": "jack",
"age": 13,
"url": "http://hiphotos.baidu.com/9_6kis/pic/item/3b8fe9df2b11c37695ee37c4.jpg",
"schoolInfo": [
{
"school_name": "清华"
},
{
"school_name": "北大"
}
]
},
{
"name": "rose",
"age": 13,
"url": "http://hiphotos.baidu.com/a03713106460/pic/item/772181666066aa0faa184c1d.jpg",
"schoolInfo": [
{
"school_name": "人大"
},
{
"school_name": "交大"
}
]
}
]
}
1.开启线程访问网络
访问网络并且将Json格式的数据读取出来，进行Json解析
public class HttpJson extends Thread {
private String url;
private ListView listView;
private JsonAdapter adapter ;
private Handler handler;
private Context context;
private static final String TAG = "HttpJson";
public HttpJson(String url, Context context, ListView listView, JsonAdapter adapter, Handler handler){
this.url = url;
this.listView = listView;
this.adapter = adapter;
this.handler = handler;
this.context = context;
}
@Override
public void run() {
try {
URL httpurl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) httpurl.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
//从输入流中取得Josn数据
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuffer sb = new StringBuffer();
String str ;
while((str = reader.readLine()) != null){
sb.append(str);
}
Log.i(TAG, "run: " + sb.toString());
final List<People> peoples = parserJson(sb.toString());
for ( People people : peoples){
Log.i(TAG, "run: " + people.toString());
}
handler.post(new Runnable() {
@Override
public void run() {
adapter.setPeoples(peoples);
listView.setAdapter(adapter);
}
});
reader.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 解析Json数据
* @param json
*/
private List<People> parserJson(String json) {
/*
*{"result":1,"personData":[{"name":"jack","age":13,"url":"http://hiphotos.baidu.com/9_6kis/pic/item/3b8fe9df2b11c37695ee37c4.jpg","schoolInfo":[{"school_name":"清华"},{"school_name":"北大"}]},{"name":"rose","age":13,"url":"http://hiphotos.baidu.com/a03713106460/pic/item/772181666066aa0faa184c1d.jpg","schoolInfo":[{"school_name":"人大"},{"school_name":"交大"}]}]}
* 可放入www.bejson.com 网站Josn解析器中解析
*/
try {
JSONObject jsonObject = new JSONObject(json);
List<People> peoples= new ArrayList<>();
int result = jsonObject.getInt("result");
if(result == 1) {
JSONArray personData = jsonObject.getJSONArray("personData");
for(int i = 0 ;i < personData.length();i++){
People peopleObject = new People();
peoples.add(peopleObject);
JSONObject object = personData.getJSONObject(i);
String name = object.getString("name");
int age = object.getInt("age");
String imageUrl = object.getString("url");
peopleObject.setName(name);
peopleObject.setAge(age);
peopleObject.setUrl(imageUrl);
JSONArray schoolInfos = object.getJSONArray("schoolInfo");
List<SchoolInfo> schInfos = new ArrayList<>();
for(int j = 0;j < schoolInfos.length();j++){
JSONObject schoolObject = schoolInfos.getJSONObject(j);
SchoolInfo school = new SchoolInfo();
String school_name = schoolObject.getString("school_name");
Log.i(TAG, "parserJson: " + school_name);
school.setSchool_name(school_name);
schInfos.add(school);
}
peopleObject.setSchoolInfo(schInfos);
}
return peoples;
}else{
Toast.makeText(context, "error", Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
}
2.接着就是JsonAdapter的实现
其中就是ListView 的用了，在getView里面，开启线程HttpImage去访问网络加载图片，
public class JsonAdapter extends BaseAdapter{
private static final String TAG = "JsonAdapter";
private Context context;
private List<People> peoples;
private LayoutInflater inflater;
private Handler handler;
public JsonAdapter(Context context,Handler handler){
this.context = context;
this.handler = handler;
inflater = LayoutInflater.from(context);
}
public List<People> getPeoples() {
return peoples;
}
public void setPeoples(List<People> peoples) {
this.peoples = peoples;
}
@Override
public int getCount() {
return peoples.size();
}
@Override
public Object getItem(int position) {
return peoples.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null){
convertView = inflater.inflate(R.layout.item_listview,null);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
People people = peoples.get(position);
if(people != null)
Log.i(TAG, "getView: " + people.toString());
holder.name.setText(people.getName());
holder.age.setText("" + people.getAge());
holder.school1.setText(people.getSchoolInfo().get(0).getSchool_name());
holder.school2.setText(people.getSchoolInfo().get(1).getSchool_name());
new HttpImage(people.getUrl(),handler,holder.imageView).start();
return convertView;
}
}
class ViewHolder {
ImageView imageView;
TextView name;
TextView age;
TextView school1;
TextView school2;
public ViewHolder(View view){
imageView = (ImageView) view.findViewById(R.id.imageView);
name = (TextView) view.findViewById(R.id.tv_name);
age = (TextView) view.findViewById(R.id.tv_age);
school1 = (TextView) view.findViewById(R.id.school1);
school2 = (TextView) view.findViewById(R.id.school2);
}
}
3.加载图片线程httpImage
public class HttpImage extends Thread{
private String url;
private Handler handler;
private ImageView imageView;
public HttpImage(String url, Handler handler, ImageView imageView) {
this.url = url;
this.handler = handler;
this.imageView = imageView;
}
@Override
public void run() {
try {
URL httpurl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) httpurl.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
InputStream in = conn.getInputStream();
final Bitmap bitmap = BitmapFactory.decodeStream(in);
handler.post(new Runnable() {
@Override
public void run() {
imageView.setImageBitmap(bitmap);
}
});
in.close();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
具体的运行结果如下
