简单地解析Json对象到UI界面上的例子-原创手记-慕课网

首先，先建立好Layout :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

   <Button
       android:id="@+id/send_request"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="发送请求"
       android:textColor="#000000"
       android:textSize="15dp"/>
    <Button
        android:id="@+id/upload"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="提交请求"
        android:textSize="15dp"
        android:textColor="#000000"/>
    <ScrollView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
        <TextView
            android:id="@+id/response_txt"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <TextView
            android:id="@+id/txt_2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <TextView
            android:id="@+id/txt_3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        </LinearLayout>

    </ScrollView>


</LinearLayout>

第二步是，建立一个类，用于写字段：

package com.example.webviewapplication;

public class App {
    private String id;
    private String name;
    private String version;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }
}

第三步，是MainActivity的设置：

package com.example.webviewapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.TextView;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.List;

import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {
   private Button send,upload;
   private TextView txt,txt_2,txt_3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        send = findViewById(R.id.send_request);
        txt = findViewById(R.id.response_txt);
        upload = findViewById(R.id.upload);
        txt_2 = findViewById(R.id.txt_2);
        txt_3 = findViewById(R.id.txt_3);

        send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
             //发出一条http请求
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        OkHttpClient client = new OkHttpClient();
                        Request request = new Request.Builder()
                                .url("http://10.0.2.2/get_data.json")
                                .build();
                        try {
                            Response response = client.newCall(request).execute();
                            String responseData = response.body().string();
                            parseJsonByGson(responseData);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }

                    }
                }).start();
            }
        });
    }

    private void parseJsonByGson(final String responseData) {
       runOnUiThread(new Runnable() {
           @Override
           public void run() {
               Gson gson = new Gson();
               List<App> appList = gson.fromJson(responseData,new TypeToken<List<App>>(){}.getType());
               txt.setText("id is "+appList.get(0).getId()+";version is "+appList.get(0).getVersion()+";name is"+appList.get(0).getVersion());
               txt_2.setText("id is "+appList.get(1).getId()+";version is "+appList.get(1).getVersion()+";name is"+appList.get(1).getVersion());
               txt_3.setText("id is "+appList.get(2).getId()+";version is "+appList.get(2).getVersion()+";name is"+appList.get(2).getVersion());
           }
       });
    }


}

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