Android高仿墨迹天气大作业

package com.example.myapplication; import android.app.Activity; import android.content.Intent; import android.os.AsyncTask; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.widget.EditText; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.util.EntityUtils; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.io.IOException; import java.io.InputStream; public class SearchActivity extends Activity { private EditText cityNameET; private static final String URL="http://t.weather.sojson.com/api/weather/city/"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_search); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.search, menu); return true; } /** * 根据输入查询相关城市天气 * @param view */ public void getData(View view){ MyTask myTask = new MyTask(); //根据城市名称获取城市对应的ID cityNameET= findViewById(R.id.search_cityname_et); String cityName=cityNameET.getText().toString(); String cityCode=getCityCode(cityName); String reqUrl=URL+cityCode; myTask.execute(reqUrl); } /** * 根据输入的城市名称获取城市对应的ID * @param cityName * @return */ private String getCityCode(String cityName) { //IO流读取city.json文件 String cityCode=""; try { // 从assets目录中读取城市ID信息 InputStream inputStream = getResources().getAssets().open("city.json"); byte [] buffer= new byte[inputStream.available()]; inputStream.read(buffer); String cityStr = new String(buffer); //将字符串转换为json数组 JSONArray jsonArray = new JSONArray(cityStr); for (int i = 0; i < jsonArray.length(); i++) { JSONObject jsonObject= jsonArray.getJSONObject(i); if (jsonObject.getString("city_name").equals(cityName)) { cityCode=jsonObject.getString("city_code"); break; } } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } return cityCode; } public class MyTask extends AsyncTask<String,Integer,String> { //执行网络请求之前的方法 @Override protected void onPreExecute() { super.onPreExecute(); } //执行网络请求 @Override protected String doInBackground(String... strings) { String returnStr=""; //根据传来的url进行解析 HttpClient httpClient = new DefaultHttpClient(); HttpGet get = new HttpGet(strings[0]); try{ HttpResponse response=httpClient.execute(get); // 访问成功 if(response.getStatusLine().getStatusCode()==200){ HttpEntity entity = response.getEntity(); returnStr = EntityUtils.toString(entity); } }catch (ClientProtocolException e){ e.printStackTrace(); }catch (IOException e){ e.printStackTrace(); } return returnStr; } //网络请求之后执行 @Override protected void onPostExecute(String s) { super.onPostExecute(s); //跳转到 MainActivity ,并传递数据 Intent intent = new Intent(SearchActivity.this,MainActivity.class); intent.putExtra("data",s); startActivity(intent); //结束当前activity finish(); } } }