大学androidDemo主要代码

package com.example.weather; import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import android.annotation.SuppressLint; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import org.jetbrains.annotations.NotNull; import org.json.JSONArray; import org.json.JSONObject; import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLEncoder; import java.util.ArrayList; import java.util.List; import okhttp3.Call; import okhttp3.Callback; import okhttp3.FormBody; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.RequestBody; import okhttp3.Response; public class MainActivity extends AppCompatActivity implements View.OnClickListener { public static final int MSG_DOWN_OK=1; public static final int MSG_DOWN_ERROR=2; private EditText m_cityEdit; private Button m_queryBtn; private ListView m_listview; private static String m_data=""; private List<Weather> m_datalist=null;//未来5天的数据 private Weather m_nowWeather;//实时数据 private DataAdapter listAdapter; //uiHandler private Handler uiHandler =new Handler(){ @Override public void handleMessage(@NonNull Message msg) { super.handleMessage(msg); switch (msg.what){ case MSG_DOWN_OK:{ //更新ui System.out.println("main thread get essage from down thread."); displayDataToUI(); break; } case MSG_DOWN_ERROR:{ Toast.makeText(MainActivity.this,"下载天气预报失败！",Toast.LENGTH_LONG).show(); break; } } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main_weather); m_cityEdit=(EditText)findViewById(R.id.edit_city); m_queryBtn=(Button)findViewById(R.id.btn_query); m_listview=(ListView)findViewById(R.id.dataListview); //设置背景透明度，需存在背景 View view_city=findViewById(R.id.layout_city); //view_city.getBackground().setAlpha(100); View view_now=findViewById(R.id.layout_nowweather); view_now.getBackground().setAlpha(100); View view_future=findViewById(R.id.layout_future); view_future.getBackground().setAlpha(100); View view_icon=findViewById(R.id.layout_icon); view_icon.getBackground().setAlpha(100); m_queryBtn.setOnClickListener(this); //默认天气为北京 String defaultcity=m_cityEdit.getText().toString().trim();//默认为北京 //在子线程下载数据 DownThread mythread=new DownThread(defaultcity); mythread.start(); }//end of onCreate @Override public void onClick(View v) { try { switch (v.getId()){ case R.id.btn_query:{ String cityname=m_cityEdit.getText().toString().trim(); //输入有效性 if(cityname.equals("")){ Toast.makeText(this,"请输入要查询的城市!",Toast.LENGTH_LONG).show(); return; } //String citynameutf8= URLEncoder.encode(cityname,"UTF-8"); //在子线程下载数据 DownThread mythread=new DownThread(cityname); mythread.start(); break; } default: break; } }catch (Exception e){ e.printStackTrace(); } }//end of onClick /* 显示数据到ui界面 */ private void displayDataToUI(){ System.out.println("main:"+m_data); if (parseJsonData()==false){ //提示 Toast.makeText(this,"下载的数据有错误！",Toast.LENGTH_LONG).show(); return; } displayNowWeather(); listAdapter=new DataAdapter(this,R.layout.list_weather,m_datalist,m_listview); m_listview.setAdapter(listAdapter); }//end of displayDataToUI @SuppressLint("SetTextI18n") private void displayNowWeather(){ ImageView image_nowweather=(ImageView)findViewById(R.id.image_nowweather); TextView text_nowtemp=(TextView)findViewById(R.id.text_tempnow);//温度 TextView text_nowweather=(TextView)findViewById(R.id.text_situation);//天气情况 TextView text_nowdirection=(TextView)findViewById(R.id.text_direction);//风向 TextView text_nowpower=(TextView)findViewById(R.id.text_power);//风力 TextView text_nowquality=(TextView)findViewById(R.id.text_quality);//空气质量 TextView text_city=(TextView)findViewById(R.id.text_city);//当前城市 TextView text_humidity=(TextView)findViewById(R.id.text_humidity);//湿度 image_nowweather.setImageResource(DataAdapter.getIcon(m_nowWeather.getWid())); text_nowtemp.setText(m_nowWeather.getTemperature()+"\u2103"); text_nowweather.setText(m_nowWeather.getWeather()); text_nowdirection.setText(m_nowWeather.getDirct()); text_nowpower.setText(m_nowWeather.getPower()); text_nowquality.setText(m_nowWeather.getAqi()); text_city.setText(m_cityEdit.getText().toString().trim()); text_humidity.setText(m_nowWeather.getHumidity()); }//end of displayNowWeather /* 解析数据 in:m_data out:m_datalist,m_nowWeather */ private boolean parseJsonData(){ try { JSONObject object=new JSONObject(m_data); if (object.getInt("error_code")!=0){ System.out.println(object.get("error_code")+":"+object.get("reason")); return false; } m_datalist=new ArrayList<Weather>(); //实时数据 m_nowWeather=new Weather(); JSONObject nowObject=object.getJSONObject("result").getJSONObject("realtime"); m_nowWeather.setTemperature(nowObject.getString("temperature")); m_nowWeather.setWid(nowObject.getString("wid")); m_nowWeather.setWeather(nowObject.getString("info")); m_nowWeather.setPower(nowObject.getString("power")); m_nowWeather.setAqi(nowObject.getString("aqi")); m_nowWeather.setDirct(nowObject.getString("direct")); m_nowWeather.setHumidity(nowObject.getString("humidity")); //未来5天的天气 JSONArray futureArray=object.getJSONObject("result").getJSONArray("future"); for (int i=0;i<futureArray.length();i++){ Weather tempWeather=new Weather(); JSONObject weatherObject=futureArray.getJSONObject(i); tempWeather.setDatastr(weatherObject.getString("date")); tempWeather.setTemperature(weatherObject.getString("temperature")); tempWeather.setWid(weatherObject.getJSONObject("wid").getString("day")); tempWeather.setWeather(weatherObject.getString("weather")); tempWeather.setDirct(weatherObject.getString("direct")); m_datalist.add(te