gson的安装和使用

1.安装

2.布局

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    >

    <Button

        android:id="@+id/send_request"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="Send Request"

        />

    <ScrollView

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        >

        <TextView

            android:id="@+id/response_text"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            />

    </ScrollView>

</LinearLayout>

3.查看声明

apply plugin: 'com.android.application'

android {

    compileSdkVersion 26

    buildToolsVersion "26.0.1"

    defaultConfig {

        applicationId "demo.jq.com.networktest"

        minSdkVersion 15

        targetSdkVersion 26

        versionCode 1

        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }

    buildTypes {

        release {

            minifyEnabled false

            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

        }

    }

}

dependencies {

    compile fileTree(include: ['*.jar'], dir: 'libs')

    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {

        exclude group: 'com.android.support', module: 'support-annotations'

    })

    compile 'com.android.support:appcompat-v7:26.+'

    compile 'com.android.support.constraint:constraint-layout:1.0.2'

    testCompile 'junit:junit:4.12'

    compile 'com.squareup.okhttp3:okhttp:3.4.1'

    compile 'com.google.code.gson:gson:2.8.2'

}

4.创建接收数据的类

package demo.jq.com.networktest;

import java.lang.reflect.Array;

/**

 * @author jim

 */

public class ApiData {

    String[] data =new String[5];

    private Integer code;

    private String message;

    public String[] getData() {

        return data;

    }

    public void setData(String[] data) {

        this.data = data;

    }

    public Integer getCode() {

        return code;

    }

    public void setCode(Integer code) {

        this.code = code;

    }

    public String getMessage() {

        return message;

    }

    public void setMessage(String message) {

        this.message = message;

    }

}

5.主体动作

package demo.jq.com.networktest;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

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.JSONObject;

import java.io.BufferedReader;

import java.io.EOFException;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.List;

import okhttp3.FormBody;

import okhttp3.OkHttpClient;

import okhttp3.Request;

import okhttp3.RequestBody;

import okhttp3.Response;

/**

 * @author jim

 */

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    TextView responseText;

    private static final String TAG = "MainActivity";

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Button sendRequest = (Button) findViewById(R.id.send_request);

        responseText = (TextView) findViewById(R.id.response_text);

        sendRequest.setOnClickListener(this);

    }

    @Override

    public void onClick(View v) {

        if (v.getId() == R.id.send_request) {

            sendRequestWithOkHttp();

        }

    }

    private void sendRequestWithOkHttp() {

        // 开启线程来发起网络请求

        new Thread(new Runnable() {

            @Override

            public void run() {

                HttpURLConnection connection = null;

                BufferedReader reader = null;

                try {

                    OkHttpClient client = new OkHttpClient();

                    // post请求

                    RequestBody requestBody = new FormBody.Builder()

                            .add("type","1")

                            .build();

                    Request request = new Request.Builder()

                            .url("http://devmg.yunlutong.com/api/test/testApi")

                            .post(requestBody)

                            .build();

                    Response response = client.newCall(request).execute();

                    String responseData = response.body().string();

                    // 解析json数据

                    parseJSONWithGSON(responseData);

                    showResponse(responseData);

                } catch (Exception e) {

                    e.printStackTrace();

                } finally {

                    if (reader != null) {

                        try {

                            reader.close();

                        } catch (IOException e) {

                            e.printStackTrace();

                        }

                    }

                    if (connection != null) {

                        connection.disconnect();

                    }

                }

            }

        }).start();

    }

    /**

     * 解析json

     * @param jsonData

     */

    private void parseJSONWithGSON(String jsonData) {

        Gson gson = new Gson();

        ApiData apiData = gson.fromJson(jsonData, ApiData.class);

        Log.d(TAG,"code is" + apiData.getCode());

        Log.d(TAG,"message is" + apiData.getMessage());

        // 遍历数据

        for(int i = 0; i < apiData.getData().length; i++){

            Log.d(TAG,"data "+i+" is " + apiData.getData()[i]);

        }

    }

    private void showResponse(final String response) {

        runOnUiThread(new Runnable() {

            @Override

            public void run() {

                responseText.setText(response);

            }

        });

    }

}

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gson的安装和使用

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