Android通过Get方法获取Json数据

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manifest文件

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.wo.checkdrugdemo">    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.INTERNET" />    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

布局文件

<?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"    android:weightSum="1">    <TableLayout        android:layout_width="match_parent"        android:layout_height="56dp">        <TableRow>            <TextView                android:layout_weight="1"                android:text="国字准号："                android:layout_height="50dp"                android:textSize="24dp"/>            <EditText                android:id="@+id/inputNum"                android:text="Z20093192"                android:layout_width="240dp"                android:layout_height="50dp"                />        </TableRow>    </TableLayout>    <TableLayout        android:layout_width="match_parent"        android:layout_height="56dp">        <TableRow>            <TextView android:layout_weight="1"/>            <Button                android:id="@+id/btnCheck"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_weight="1"                android:text="查询"                android:textSize="30dp" />            <TextView android:layout_weight="1"/>            <Button                android:id="@+id/btnExit"                android:layout_weight="1"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="退出"                android:textSize="30dp"/>            <TextView android:layout_weight="1"/>        </TableRow>    </TableLayout>    <TextView        android:id="@+id/display"        android:textSize="24dp"        android:scrollbars="vertical"        android:scrollbarStyle="outsideOverlay"        android:scrollbarFadeDuration="2000"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>

这里写图片描述

Activity文件代码

package com.example.wo.checkdrugdemo;import android.annotation.SuppressLint;import android.os.Bundle;import android.os.StrictMode;import android.support.v7.app.AppCompatActivity;import android.text.Html;import android.text.method.ScrollingMovementMethod;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import org.json.JSONException;import org.json.JSONObject;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;/** * Created by yuanlifu on 2016/9/21. */public class MainActivity extends AppCompatActivity {    private Button btnExit;    private Button btnCheck;    private EditText inputText = null;    private TextView display;    static String url = "http://www.tngou.net/api/drug/number?number=";    @SuppressLint("NewApi")    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main_layout);        btnExit = (Button) findViewById(R.id.btnExit);        btnCheck = (Button) findViewById(R.id.btnCheck);        inputText = (EditText) findViewById(R.id.inputNum);        display = (TextView) findViewById(R.id.display);        display.setMovementMethod(new ScrollingMovementMethod());//让TextView也能滚动的方法                                                                 //还要配合XML文件中的TextView属性设置        btnCheck.setOnClickListener(new View.OnClickListener(){//查询键处理            @Override            public void onClick(View v) {                if (inputText.getText().toString()!=null){                    try{                        processResponse(                                searchRequest(inputText.getText().toString())                        );                    }catch (Exception e){                        Log.v("Exception Google search","Exception:"+e.getMessage());                    }                }              //  inputText.setText("");//清空            }        });        btnExit.setOnClickListener(new View.OnClickListener(){//取消键处理            @Override            public void onClick(View v) {                inputText.setText("");//清空输入框            }        });        closeStrictMode();    }    /**     * 据说是如果用android端 使用HttpURLConnection请求,得到的getResponseCode()会返回-1     * 主要问题在于线程, 要单独走一个线程, 不能直接走主线程     * 解决方法有两种:     *一:为该请求单独起一个线程     *二:自己写个方法:     */    public static void closeStrictMode() {//不知道干嘛的，但是加上去之后就可以读取到网站的内容了        StrictMode.setThreadPolicy(        new StrictMode                .ThreadPolicy                .Builder()                .detectAll()                .penaltyLog()                .build());    }    public String searchRequest(String searchString) throws IOException {//用于获取网站的Json数据        String newFeed = url+searchString;        StringBuilder response = new StringBuilder();        Log.v("gsearch","gsearch url:"+newFeed);        URL url = new URL(newFeed);        HttpURLConnection httpconn = (HttpURLConnection) url.openConnection();        httpconn.setReadTimeout(10000);        httpconn.setConnectTimeout(15000);        httpconn.setRequestMethod("GET");        httpconn.setDoInput(true);        httpconn.connect();        if (httpconn.getResponseCode()==200){//HttpURLConnection.HTTP_OK            BufferedReader input = new BufferedReader(new InputStreamReader(httpconn.getInputStream()),8192);            String strLine = null;            while ((strLine = input.readLine()) != null){                response.append(strLine);            }            input.close();        }        return response.toString();    }    public void processResponse(String resp){//用于解析Json数据        JSONObject root = null;        try {            root = new JSONObject(resp);//            display.setText("description:"+root.getString("description"));//纯Json数据的显示//            display.setText("message:"+root.getString("message"));            //另外Json数组的运用也是常用的            String htmlText = new String();//用于存放从Json数据里剥离的HTML数据            htmlText = root.getString("message");//从Json数据里将HTML数据剥离出来            display.setText(Html.fromHtml(htmlText));//Json数据里面的HTML数据解析        } catch (JSONException e) {            e.printStackTrace();        }    }}

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