新手学习Android 的一些记录！利用快递100 留出来的API接口去获取物流信息，然后利用Android上的Gson解析 json数据，利用ListView显示到App上面，只是一个简单的界面
没什么技术含量
程序的结构目录 一个Model 里面对应着Jons数据中的成员
然后生成一些Get Set方法
还用定义一个Htpp类 用来获取网上的数据 最后返回字符串 在网上获取的应该是InputStream类型的，为了省事，我声明了一个工具类 放在了IOutils 包下面
一个静态方法，功能就是把InputStream装换成String 就是在网上获取Json数据转换成字符串，然后在让Gson去解析！
这个App主要拥有两个Activity 一个是让用户输入 快递公司，另一个是输入块单号！ 在mainActivity启动然后携带参数跳转到第二个Activity中 在第二个Activity中有一个TextView 和一个LisView
<strong>这个是mainActivity中的代码：</strong>
package com.example.logistics; import java.io.IOException; import java.util.List; import okhttp3.Call; import okhttp3.Callback; import okhttp3.Response; import com.example.gsonModel.DetailData; import com.example.gsonModel.MyLogistics; import com.example.httpUtil.HttpCallbackListener; import com.example.httpUtil.HttpUtil; import com.google.gson.Gson; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.view.LayoutInflater; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.TextView; public class MainActivity extends Activity { private Button btn_find; private TextView ev_kd; private TextView ev_dh; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ev_kd = (TextView)findViewById(R.id.ev_kd); ev_dh = (TextView)findViewById(R.id.ev_dh); btn_find = (Button)findViewById(R.id.btn_find); btn_find.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent=new Intent(); Bundle bundle=new Bundle(); bundle.putString("kdName", ev_kd.getText().toString().trim()); bundle.putString("urlAddress",ev_dh.getText().toString().trim()); intent.putExtra("message",bundle); intent.setClass(MainActivity.this,LogisticActivity.class); startActivity(intent); } }); } } 下面这个是我用来显示具体物流信息的那个Activity代码 package com.example.logistics; import java.util.List; import com.example.gsonModel.DetailData; import com.example.gsonModel.MyLogistics; import com.example.httpUtil.HttpCallbackListener; import com.example.httpUtil.HttpUtil; import com.google.gson.Gson; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.TextView; public class LogisticActivity extends Activity { private Handler handler; private ListView lv_show; private String txt; private String kdName; private String kdNum; private TextView tv_message; protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_logistics); Intent intent=getIntent(); Bundle bundle=intent.getBundleExtra("message"); lv_show=(ListView)findViewById(R.id.lv_show); tv_message=(TextView)findViewById(R.id.tv_message); kdName=bundle.getString("kdName"); kdNum=bundle.getString("urlAddress"); HttpUtil.sendOkHttpRequest("http://www.kuaidi100.com/query?type="+kdName+"&postid="+kdNum,new HttpCallbackListener() { public void onFinish(String response) { // TODO Auto-generated method stub // 在这里根据返回内容执行具体逻辑 String text = response.toString(); Message msg = new Message(); Bundle data = new Bundle(); data.putString("logcontent",text); msg.setData(data); handler.sendMessage(msg); } @Override public void onError(Exception e) { // TODO Auto-generated method stub // 在这里对异常进行处理 System.out.println(e); } }); handler = new Handler() { public void handleMessage(Message msg) { super.handleMessage(msg); Bundle data = msg.getData(); txt = data.getString("logcontent"); Gson gson = new Gson(); MyLogistics logistics = gson.fromJson(txt, MyLogistics.class); String nu = logistics.getNu(); tv_message.setText("快递单号："+nu+" 下面是详细物流信息"); List<DetailData> datalists = logistics.getData(); MyAdapter adapter = new MyAdapter(getApplicationContext(), R.layout.logis_item, datalists); lv_show.setAdapter(adapter); } }; } public class MyAdapter extends ArrayAdapter<DetailData> { private int resource; private Context context; public MyAdapter(Context context, int resource, List<DetailData> data) { super(context, resource, data); // TODO Auto-generated constructor stub this.resource = resource; this.context=context; } public View getView(int position, View convertView, ViewGroup parent) { View view = null; DetailData mess = getItem(position); if (convertView == null) { view = LayoutInflater.from(context).inflate( resource, parent, false); } else { view = convertView; } TextView tv_time = (TextView) view.findViewById(R.id.tv_time); TextView tv_ftime = (TextView) view.findViewById(R.id.tv_ftime); TextView tv_context = (TextView) view.findViewById(R.id.tv_context); TextView tv_location = (TextView) view .findViewById(R.id.tv_location); tv_time.setText("到达时间：" + mess.getTime()); tv_ftime.setText("发出时间：" + mess.getFtime()); tv_context.setText("物流信息:" + mess.getContext()); tv_location.setText("所在位置:" + mess.getLocation()); return view; } } } private Handler handler; private ListView lv_show; private String txt; private String kdName; private String kdNum; private TextView tv_message; protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_logistics); Intent intent=getIntent(); Bundle bundle=intent.getBundleExtra("message"); lv_show=(ListView)findViewById(R.id.lv_show); tv_message=(TextView)findViewById(R.id.tv_message); kdName=bundle.getString("kdName"); kdNum=bundle.getString("urlAddress"); HttpUtil.sendOkHttpRequest("http://www.kuaidi100.com/query?type="+kdName+"&postid="+kdNum,new HttpCallbackListener() { public void onFinish(String response) { // TODO Auto-generated method stub // 在这里根据返回内容执行具体逻辑 String text = response.toString(); Message msg = new Message(); Bundle data = new Bundle(); data.putString("logcontent",text); msg.setData(data); handler.sendMessage(msg); } @Override public void onError(Exception e) { // TODO Auto-generated method stub // 在这里对异常进行处理 System.out.println(e); } }); handler = new Handler() { public void handleMessage(Message msg) { super.handleMessage(msg); Bundle data = msg.getData(); txt = data.getString("logcontent"); Gson gson = new Gson(); MyLogistics logistics = gson.fromJson(txt, MyLogistics.class); String nu = logistics.getNu(); tv_message.setText("快递单号："+nu+" 下面是详细物流信息"); List<DetailData> datalists = logistics.getData(); MyAdapter adapter = new MyAdapter(getApplicationContext(), R.layout.logis_item, datalists); lv_show.setAdapter(adapter); } }; } public class MyAdapter extends ArrayAdapter<DetailData> { private int resource; private Context context; public MyAdapter(Context context, int resource, List<DetailData> data) { super(context, resource, data); // TODO Auto-generated constructor stub this.resource = resource; this.context=context; } public View getView(int position, View convertView, ViewGroup parent) { View view = null; DetailData mess = getItem(position); if (convertView == null) { view = LayoutInflater.from(context).inflate( resource, parent, false); } else { view = convertView; } TextView tv_time = (TextView) view.findViewById(R.id.tv_time); TextView tv_ftime = (TextView) view.findViewById(R.id.tv_ftime); TextView tv_context = (TextView) view.findViewById(R.id.tv_context); TextView tv_location = (TextView) view .findViewById(R.id.tv_location); tv_time.setText("到达时间：" + mess.getTime()); tv_ftime.setText("发出时间：" + mess.getFtime()); tv_context.setText("物流信息:" + mess.getContext()); tv_location.setText("所在位置:" + mess.getLocation()); return view; } } }
联网工具类的代码
package com.example.httpUtil; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import com.example.IOutils.InstreamToString; import okhttp3.OkHttpClient; import okhttp3.Request; public class HttpUtil { public static void sendOkHttpRequest(final String address,final HttpCallbackListener listener ) { new Thread(new Runnable() { @Override public void run() { HttpURLConnection connection=null; try { URL url=new URL(address); connection=(HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); connection.setConnectTimeout(8000); connection.setReadTimeout(8000); connection.setDoInput(true); connection.setDoOutput(true); InputStream in=connection.getInputStream(); String text = InstreamToString.convertStreamToString(in); //System.out.println(text); if(listener!=null) { //回调onFinish（）方法 listener.onFinish(text); } } catch (Exception e) { if(listener!=null) { //回调onError()方法法 listener.onError(e); } e.printStackTrace(); }finally{ if(connection!=null) { connection.disconnect(); } } } }).start(); } }
HttpCallbackListener 回调代码
package com.example.httpUtil; public interface HttpCallbackListener { void onFinish(String response); void onError(Exception e); }
转换成字符串类的 代码
package com.example.IOutils; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; public class InstreamToString { public static String convertStreamToString(InputStream is) { BufferedReader reader=new BufferedReader(new InputStreamReader(is)); StringBuilder sb=new StringBuilder(); String line=null; try { while((line=reader.readLine())!=null) { sb.append(line); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return sb.toString(); } }
效果图片，最坑的是我在设置ListView适配器的时候！！！啊啊，程序老是异常结束，各种调试，，，各种设置适配器参数，，最后结果发现，，，是我悲剧的没有
找到ListView这个组件，，，，，ListView lv_show=(ListView)findViewById(R.id.lv_show); 这次记住了！！
