編輯:關於Android編程
package com.example.weather.util; public interface HttpCallbackListener { void onFinish(String response); void onError(Exception e); }然後定義 HttpUtil 類,代碼如下
package com.example.weather.util; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import android.util.Log; public class HttpUtil { public static void sendHttpRequest(final String address, final HttpCallbackListener listener) { new Thread(new Runnable() { 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(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); StringBuilder response = new StringBuilder(); String line; while ((line = reader.readLine()) != null) { response.append(line); } if (listener != null) { // 回調 onFinish()方法 listener.onFinish(response.toString()); } } catch (Exception e) { if (listener != null) { // 回調 onError()方法 listener.onError(e); } } finally { if (connection != null) { connection.disconnect(); } } } }).start(); } }3、測試一下能否正常訪問天氣預報接口得到返回的數據
package com.example.weather.test; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import com.example.weather.util.HttpCallbackListener; import com.example.weather.util.HttpUtil; import android.test.AndroidTestCase; public class WeatherGetTest extends AndroidTestCase{ public void testGetData(){ String cityName; try { cityName = URLEncoder.encode("菏澤", "utf-8"); String weatherUrl="http://v.juhe.cn/weather/index?format=2&cityname="+cityName+"&key=ab9d7e2007472d723baf71fcdc4ba094"; HttpUtil.sendHttpRequest(weatherUrl, new HttpCallbackListener() { public void onFinish(String response) { // TODO Auto-generated method stub System.out.println(response); } public void onError(Exception e) { // TODO Auto-generated method stub } }); }catch (Exception e) { // TODO: handle exception } } }由於涉及到訪問網絡,需要在 AndroidManifest.xml 文件中加入訪問網絡的權限。
activity_weather_listitem.xml
weather_list_layout_animation.xml
Weather.java
package com.example.weather.moder; public class Weather { private String dayOfWeek;//星期幾 private String date;//日期 private String temperature;//溫度 private String weather;//天氣 public Weather(){ } public Weather(String dayOfWeek, String date, String temperature, String weather) { super(); this.dayOfWeek = dayOfWeek; this.date = date; this.temperature = temperature; this.weather = weather; } public String getDayOfWeek() { return dayOfWeek; } public void setDayOfWeek(String dayOfWeek) { this.dayOfWeek = dayOfWeek; } public String getDate() { return date; } public void setDate(String date) { this.date = date; } public String getTemperature() { return temperature; } public void setTemperature(String temperature) { this.temperature = temperature; } public String getWeather() { return weather; } public void setWeather(String weather) { this.weather = weather; } @Override public String toString() { return "Weather [dayOfWeek=" + dayOfWeek + ", date=" + date + ", temperature=" + temperature + ", weather=" + weather + "]"; } }在 adapter 包下定義適配器 WeatherAdapter
package com.example.weather.adapter; import java.util.List; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.TextView; import com.example.weather.R; import com.example.weather.moder.Weather; /** * 天氣適配器 * @author zhupeng * */ public class WeatherAdapter extends ArrayAdapterWeatherActivity.java{ private int resourceId; public WeatherAdapter(Context context, int textViewResourceId, List objects) { super(context, textViewResourceId, objects); resourceId = textViewResourceId; } @Override public View getView(int position, View convertView, ViewGroup viewgroup) { Weather weather=getItem(position); ViewHolder viewHolder=null; if(convertView==null){ viewHolder=new ViewHolder(); convertView=LayoutInflater.from(getContext()).inflate(resourceId, null); viewHolder.tvDayOfWeek=(TextView) convertView.findViewById(R.id.tvDayofWeek); viewHolder.tvDate=(TextView) convertView.findViewById(R.id.tvDate); viewHolder.tvTemperature=(TextView) convertView.findViewById(R.id.tvTemperature); viewHolder.tvWeather=(TextView) convertView.findViewById(R.id.tvWeather); convertView.setTag(viewHolder); }else{ viewHolder=(ViewHolder) convertView.getTag(); } viewHolder.tvDayOfWeek.setText(weather.getDayOfWeek()); viewHolder.tvDate.setText(weather.getDate()); viewHolder.tvTemperature.setText(weather.getTemperature()); viewHolder.tvWeather.setText(weather.getWeather()); return convertView; } private class ViewHolder{ TextView tvDayOfWeek; TextView tvDate; TextView tvTemperature; TextView tvWeather; } }
package com.example.weather; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import java.util.ArrayList; import java.util.List; import com.example.weather.adapter.WeatherAdapter; import com.example.weather.moder.Weather; import com.example.weather.util.HttpCallbackListener; import com.example.weather.util.HttpUtil; import com.google.gson.JsonArray; import com.google.gson.JsonObject; import com.google.gson.JsonParser; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.view.View.OnClickListener; import android.view.animation.LayoutAnimationController; import android.view.animation.ScaleAnimation; import android.widget.EditText; import android.widget.ImageButton; import android.widget.ListView; import android.widget.Toast; public class WeatherActivity extends Activity { private EditText ecCity; private ImageButton btnQuery; private ListView lvFutureWeather; public static final int SHOW_RESPONSE=1; private Listdata; private Handler handler=new Handler(){ public void handleMessage(Message msg){ switch (msg.what) { case SHOW_RESPONSE: String response=(String )msg.obj; if(response!=null){ parseWithJSON(response); WeatherAdapter weatherAdapter=new WeatherAdapter (WeatherActivity.this, R.layout.activity_weather_listitem, data); lvFutureWeather.setAdapter(weatherAdapter); ScaleAnimation scaleAnimation=new ScaleAnimation(0,1,0,1); scaleAnimation.setDuration(1000); LayoutAnimationController animationController = new LayoutAnimationController( scaleAnimation, 0.6f); lvFutureWeather.setLayoutAnimation(animationController); } break; default: break; } } private void parseWithJSON(String response) { // TODO Auto-generated method stub data=new ArrayList (); JsonParser parser=new JsonParser();//json解析器 JsonObject obj=(JsonObject) parser.parse(response); //獲取返回狀態嗎 String resultcode=obj.get("resultcode").getAsString(); //狀態碼如果是200說明數據返回成功 if(resultcode!=null&&resultcode.equals("200")){ JsonObject resultObj=obj.get("result").getAsJsonObject(); JsonArray futureWeatherArray=resultObj.get("future").getAsJsonArray(); for(int i=0;i (); } private void setListeners(){ btnQuery.setOnClickListener(new OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub String cityName=ecCity.getText().toString(); try { cityName = URLEncoder.encode("菏澤", "utf-8"); //這裡我弄成默認的城市了,如果想根據輸入的值進行搜索,,,可以把這句話換成cityName = URLEncoder.encode(cityName, "utf-8"); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } System.out.println("lvFutureWeather="+lvFutureWeather); Toast.makeText(WeatherActivity.this, "success", Toast.LENGTH_LONG).show(); String weatherUrl = "http://v.juhe.cn/weather/index?format=2&cityname="+cityName+"&key=ab9d7e2007472d723baf71fcdc4ba094"; Toast.makeText(WeatherActivity.this, "success"+weatherUrl, Toast.LENGTH_LONG).show(); HttpUtil.sendHttpRequest(weatherUrl, new HttpCallbackListener() { public void onFinish(String response) { // TODO Auto-generated method stub Message message=new Message(); message.what=SHOW_RESPONSE; //將服務器返回的結果存放到Message中 message.obj=response.toString(); handler.sendMessage(message); } public void onError(Exception e) { // TODO Auto-generated method stub System.out.println("訪問失敗"); } }); } }); } }
cityName = URLEncoder.encode("菏澤", "utf-8");
在前面已經介紹了SlidingMenu的用法:Android開源項目SlidingMenu的學習筆記(一),接下來再深入學習下,根據滑出項的Menu切換到對應的頁面 目錄
需求:模擬android系統應用設置中飛行模式的開啟與關閉,並記住設置的狀態 布局文件:fragment_main.xml 資源文件s
對於Android 的手勢不光在軟件中會經常用到,比如浏覽器中的翻頁,滾動頁面等等;當然其實在我
在我們使用手機的時候,由於眼睛需要正對著屏幕,隨著時間的增加,就會引起眼睛疲勞,不適,以及近視等問題,所以我們在使用手機的時候盡量要控制好使用時間,保護好自