昨天花了两个小时做了一个天气预报的Demo,希望对新人有所帮助。

主要代码如下： package com.example.pxh;
import java.io.IOException; import java.util.ArrayList; import java.util.List;
import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.NameValuePair; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject;
import com.exampe.pxh.url.TargetUrl; import com.pxh.service.PageService;
import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{ private Button btn; private String result,city,TAG,dayPictureUrl0,nightPictureUrl0; private Handler handler,handler1; private EditText cityInput; private TextView tv,tv1,tv2,tv3; private ImageView img; private byte[] data1,data2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); handler = new Handler(){ public void handleMessage(Message msg){ if(result != null){ try { JSONObject datajson = new JSONObject(result);//第一步、将string格式转换回json格式 JSONArray results = datajson.getJSONArray("results");//获取results数组 // JSONObject city = results.getJSONObject(0); String currentCity = city.getString("currentCity");//获取city名字 String pm25 = city.getString("pm25");//获取pm25 Log.i(TAG, "城市"+currentCity+" pm25 "+pm25);//测试城市和pm25 tv.setText("城市:"+currentCity+"\n"+"pm25:"+pm25); JSONArray index = city.getJSONArray("index");//获取index里面的JSONArray //获取穿衣 JSONObject cy = index.getJSONObject(0); String titlec = cy.getString("title"); String zsc = cy.getString("zs"); String tiptc = cy.getString("tipt"); String desc = cy.getString("des"); //获取洗车 JSONObject xc = index.getJSONObject(1); String titlex = xc.getString("title"); String zsx = xc.getString("zs"); String tiptx = xc.getString("tipt"); String desx = xc.getString("des"); Log.i(TAG, "！！！！！！！！！"+titlec+zsc+tiptc+desc);//测试穿衣 tv1.setText(titlec+":"+zsc+"\n"+tiptc+":"+desc); Log.i(TAG, "！！！！！！！！！"+titlex+zsx+tiptx+desx); tv2.setText(titlex+":"+zsx+"\n"+tiptx+":"+desx); //...... /* * weather_data，未来几天 */ JSONArray weather_data = city.getJSONArray("weather_data"); //获取明天 JSONObject today = weather_data.getJSONObject(0); String date0 = today.getString("date"); dayPictureUrl0 = today.getString("dayPictureUrl"); nightPictureUrl0 = today.getString("nightPictureUrl"); String weather0 = today.getString("weather"); String wind0 = today.getString("wind"); String temperature0 = today.getString("temperature"); tv3.setText("今天:"+date0+"\n"+"实时:"+weather0+"\n"+"风力："+wind0+"\n"+"温度范围:"+temperature0); //返回图片 new Thread(new Runnable(){ @Override public void run() { // TODO Auto-generated method stub PageService page = new PageService(); try { data1 = page.getImage(dayPictureUrl0); Message m = handler1.obtainMessage(); handler1.sendMessage(m); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }).start(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } super.handleMessage(msg); } }; handler1 = new Handler(){ public void handleMessage(Message msg) { Bitmap image=BitmapFactory.decodeByteArray(data1, 0, data1.length); img.setImageBitmap(image);} }; } private void initView(){ cityInput = (EditText)findViewById(R.id.cityInput); btn = (Button)findViewById(R.id.btn); tv = (TextView)findViewById(R.id.tv); tv1 = (TextView)findViewById(R.id.tv1); tv2 = (TextView)findViewById(R.id.tv2); tv3 = (TextView)findViewById(R.id.tv3); img = (ImageView)findViewById(R.id.img); btn.setOnClickListener(this); } @Override public void onClick(View v) { // TODO Auto-generated method stub switch (v.getId()) { case R.id.btn: if(cityInput.getText().toString().equals("") || cityInput.getText().toString() == null){ Toast.makeText(MainActivity.this, "请输入城市", Toast.LENGTH_LONG).show(); }else{ new Thread(new Runnable() { @Override public void run() { // TODO Auto-generated method stub send(cityInput.getText().toString()); Message m = handler.obtainMessage(); handler.sendMessage(m); } }).start(); } break;
default: break; } } private String send(String city){ String target = TargetUrl.url1+city+TargetUrl.url2; // 要提交的目标地址，申请接口的时候分配的。 HttpClient httpclient=new DefaultHttpClient(); HttpGet httpRequest = new HttpGet(target); // 创建HttpGet对象 HttpResponse httpResponse = null; try { httpResponse = httpclient.execute(httpRequest); if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { // 如果请求成功 result = EntityUtils.toString(httpResponse.getEntity()).trim(); // 获取返回的字符串 } else { result = "fail"; } }catch (ClientProtocolException e) { // TODO: handle exception\ e.printStackTrace(); }catch (IOException e) { // TODO: handle exception e.printStackTrace(); } return null; } } 里面用的getImage方法其实就是一个将图片变成byte[]数组的方法，调用返回之后用BitmapFactory还原就可以了。

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