这个项目是《第一行代码-Android》这本书里面的。最后一章。我是才学android三天,做这个更多是了解android项目是啥样子。
项目结构:
db这个包类似ssh框架里的service,里面有关于数据库的操作。
值得注意的是,如何将CoolWeatherDB设为单例类:将构造方法私有化,并提供一个getInstance()方法来获取CoolWeatherDB的实例,这样就可以保证全局范围内只有一个CoolWeatherDB的实例。
/** * 将构造方法私有化 */ private CoolWeatherDB(Context context) { CoolWeatherOpenHelper dbHelper = new CoolWeatherOpenHelper(context, DB_NAME, null, VERSION); db = dbHelper.getWritableDatabase(); } /** * 获取CoolWeatherDB的实例。 */ public synchronized static CoolWeatherDB getInstance(Context context) { if (coolWeatherDB == null) { coolWeatherDB = new CoolWeatherDB(context); } return coolWeatherDB; }
model包就是entity。
util包下面就是工具类。
与服务器交互:
package com.coolweather.app.util; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; public class HttpUtil { public static void sendHttpRequest(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); 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) { // 回调onFinish()方法 listener.onFinish(response.toString()); } } catch (Exception e) { if (listener != null) { // 回调onError()方法 listener.onError(e); } } finally { if (connection != null) { connection.disconnect(); } } } }).start(); } }
返回服务器结果的接口:
package com.coolweather.app.util; public interface HttpCallbackListener { void onFinish(String response); void onError(Exception e); }
解析和处理服务器返回的数据,"代号|城市,代号|城市"
package com.coolweather.app.util; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; import org.json.JSONException; import org.json.JSONObject; import com.coolweather.app.db.CoolWeatherDB; import com.coolweather.app.model.City; import com.coolweather.app.model.County; import com.coolweather.app.model.Province; import android.content.Context; import android.content.SharedPreferences; import android.preference.PreferenceManager; import android.text.TextUtils; public class Utility { /** * 解析和处理服务器返回的省级数据 */ public synchronized static boolean handleProvincesResponse( CoolWeatherDB coolWeatherDB, String response) { if (!TextUtils.isEmpty(response)) { String[] allProvinces = response.split(","); if (allProvinces != null && allProvinces.length > 0) { for (String p : allProvinces) { String[] array = p.split("\\|"); Province province = new Province(); province.setProvinceCode(array[0]); province.setProvinceName(array[1]); // 将解析出来的数据存储到Province表 coolWeatherDB.saveProvince(province); } return true; } } return false; } /** * 解析和处理服务器返回的市级数据 */ public static boolean handleCitiesResponse(CoolWeatherDB coolWeatherDB, String response, int provinceId) { if (!TextUtils.isEmpty(response)) { String[] allCities = response.split(","); if (allCities != null && allCities.length > 0) { for (String c : allCities) { String[] array = c.split("\\|"); City city = new City(); city.setCityCode(array[0]); city.setCityName(array[1]); city.setProvinceId(provinceId); // 将解析出来的数据存储到City表 coolWeatherDB.saveCity(city); } return true; } } return false; } /** * 解析和处理服务器返回的县级数据 */ public static boolean handleCountiesResponse(CoolWeatherDB coolWeatherDB, String response, int cityId) { if (!TextUtils.isEmpty(response)) { String[] allCounties = response.split(","); if (allCounties != null && allCounties.length > 0) { for (String c : allCounties) { String[] array = c.split("\\|"); County county = new County(); county.setCountyCode(array[0]); county.setCountyName(array[1]); county.setCityId(cityId); // 将解析出来的数据存储到County表 coolWeatherDB.saveCounty(county); } return true; } } return false; } /** * 解析服务器返回的JSON数据,并将解析出的数据存储到本地。 */ public static void handleWeatherResponse(Context context, String response) { try { JSONObject jsonObject = new JSONObject(response); JSONObject weatherInfo = jsonObject.getJSONObject("weatherinfo"); String cityName = weatherInfo.getString("city"); String weatherCode = weatherInfo.getString("cityid"); String temp1 = weatherInfo.getString("temp1"); String temp2 = weatherInfo.getString("temp2"); String weatherDesp = weatherInfo.getString("weather"); String publishTime = weatherInfo.getString("ptime"); saveWeatherInfo(context, cityName, weatherCode, temp1, temp2, weatherDesp, publishTime); } catch (JSONException e) { e.printStackTrace(); } } /** * 将服务器返回的所有天气信息存储到SharedPreferences文件中。 */ public static void saveWeatherInfo(Context context, String cityName, String weatherCode, String temp1, String temp2, String weatherDesp, String publishTime) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy年M月d日", Locale.CHINA); SharedPreferences.Editor editor = PreferenceManager .getDefaultSharedPreferences(context).edit(); editor.putBoolean("city_selected", true); editor.putString("city_name", cityName); editor.putString("weather_code", weatherCode); editor.putString("temp1", temp1); editor.putString("temp2", temp2); editor.putString("weather_desp", weatherDesp); editor.putString("publish_time", publishTime); editor.putString("current_date", sdf.format(new Date())); editor.commit(); } }
界面布局:
choose_area.xml先是定义了一个50dp高的头布局,并在里面放置了一个TextView用于显示标题的内容。然后在头布局的下面定义了一个ListView,省级县的数据就将显示在这里。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <RelativeLayout android:layout_width="match_parent" android:layout_height="50dp" android:background="#484E61" > <TextView android:id="@+id/title_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:textColor="#fff" android:textSize="24sp" /> </RelativeLayout> <ListView android:id="@+id/list_view" android:layout_width="match_parent" android:layout_height="match_parent" > </ListView> </LinearLayout>
weather_layout.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <RelativeLayout android:layout_width="match_parent" android:layout_height="50dp" android:background="#484E61" > <Button android:id="@+id/switch_city" android:layout_width="30dp" android:layout_height="30dp" android:layout_centerVertical="true" android:layout_marginLeft="10dp" android:background="@drawable/home" /> <TextView android:id="@+id/city_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:textColor="#fff" android:textSize="24sp" /> <Button android:id="@+id/refresh_weather" android:layout_width="30dp" android:layout_height="30dp" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:layout_marginRight="10dp" android:background="@drawable/refresh" /> </RelativeLayout> <RelativeLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:background="#27A5F9" > <TextView android:id="@+id/publish_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_marginRight="10dp" android:layout_marginTop="10dp" android:textColor="#FFF" android:textSize="18sp" /> <LinearLayout android:id="@+id/weather_info_layout" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:orientation="vertical" > <TextView android:id="@+id/current_date" android:layout_width="wrap_content" android:layout_height="40dp" android:gravity="center" android:textColor="#FFF" android:textSize="18sp" /> <TextView android:id="@+id/weather_desp" android:layout_width="wrap_content" android:layout_height="60dp" android:layout_gravity="center_horizontal" android:gravity="center" android:textColor="#FFF" android:textSize="40sp" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="60dp" android:layout_gravity="center_horizontal" android:orientation="horizontal" > <TextView android:id="@+id/temp1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:textColor="#FFF" android:textSize="40sp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:layout_marginLeft="10dp" android:layout_marginRight="10dp" android:text="~" android:textColor="#FFF" android:textSize="40sp" /> <TextView android:id="@+id/temp2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:textColor="#FFF" android:textSize="40sp" /> </LinearLayout> </LinearLayout> </RelativeLayout> </LinearLayout>
activity包:活动,类似ssh框架里的controller?
package com.coolweather.app.activity; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.app.ProgressDialog; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.text.TextUtils; import android.view.View; import android.view.Window; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.coolweather.app.R; import com.coolweather.app.db.CoolWeatherDB; import com.coolweather.app.model.City; import com.coolweather.app.model.County; import com.coolweather.app.model.Province; import com.coolweather.app.util.HttpCallbackListener; import com.coolweather.app.util.HttpUtil; import com.coolweather.app.util.Utility; public class ChooseAreaActivity extends Activity { public static final int LEVEL_PROVINCE = 0; public static final int LEVEL_CITY = 1; public static final int LEVEL_COUNTY = 2; private ProgressDialog progressDialog; private TextView titleText; private ListView listView; private ArrayAdapter<String> adapter; private CoolWeatherDB coolWeatherDB; private List<String> dataList = new ArrayList<String>(); /** * 省列表 */ private List<Province> provinceList; /** * 市列表 */ private List<City> cityList; /** * 县列表 */ private List<County> countyList; /** * 选中的省份 */ private Province selectedProvince; /** * 选中的城市 */ private City selectedCity; /** * 当前选中的级别 */ private int currentLevel; /** * 是否从WeatherActivity中跳转过来。 */ private boolean isFromWeatherActivity; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); isFromWeatherActivity = getIntent().getBooleanExtra("from_weather_activity", false); SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); if (prefs.getBoolean("city_selected", false) && !isFromWeatherActivity) { Intent intent = new Intent(this, WeatherActivity.class); startActivity(intent); finish(); return; } requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.choose_area); listView = (ListView) findViewById(R.id.list_view); titleText = (TextView) findViewById(R.id.title_text); adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, dataList); listView.setAdapter(adapter); coolWeatherDB = CoolWeatherDB.getInstance(this); listView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View view, int index, long arg3) { if (currentLevel == LEVEL_PROVINCE) { selectedProvince = provinceList.get(index); queryCities(); } else if (currentLevel == LEVEL_CITY) { selectedCity = cityList.get(index); queryCounties(); } else if (currentLevel == LEVEL_COUNTY) { String countyCode = countyList.get(index).getCountyCode(); Intent intent = new Intent(ChooseAreaActivity.this, WeatherActivity.class); intent.putExtra("county_code", countyCode); startActivity(intent); finish(); } } }); queryProvinces(); // 加载省级数据 } /** * 查询全国所有的省,优先从数据库查询,如果没有查询到再去服务器上查询。 */ private void queryProvinces() { provinceList = coolWeatherDB.loadProvinces(); if (provinceList.size() > 0) { dataList.clear(); for (Province province : provinceList) { dataList.add(province.getProvinceName()); } adapter.notifyDataSetChanged(); listView.setSelection(0); titleText.setText("中国"); currentLevel = LEVEL_PROVINCE; } else { queryFromServer(null, "province"); } } /** * 查询选中省内所有的市,优先从数据库查询,如果没有查询到再去服务器上查询。 */ private void queryCities() { cityList = coolWeatherDB.loadCities(selectedProvince.getId()); if (cityList.size() > 0) { dataList.clear(); for (City city : cityList) { dataList.add(city.getCityName()); } adapter.notifyDataSetChanged(); listView.setSelection(0); titleText.setText(selectedProvince.getProvinceName()); currentLevel = LEVEL_CITY; } else { queryFromServer(selectedProvince.getProvinceCode(), "city"); } } /** * 查询选中市内所有的县,优先从数据库查询,如果没有查询到再去服务器上查询。 */ private void queryCounties() { countyList = coolWeatherDB.loadCounties(selectedCity.getId()); if (countyList.size() > 0) { dataList.clear(); for (County county : countyList) { dataList.add(county.getCountyName()); } adapter.notifyDataSetChanged(); listView.setSelection(0); titleText.setText(selectedCity.getCityName()); currentLevel = LEVEL_COUNTY; } else { queryFromServer(selectedCity.getCityCode(), "county"); } } /** * 根据传入的代号和类型从服务器上查询省市县数据。 */ private void queryFromServer(final String code, final String type) { String address; if (!TextUtils.isEmpty(code)) { address = "http://www.weather.com.cn/data/list3/city" + code + ".xml"; } else { address = "http://www.weather.com.cn/data/list3/city.xml"; } showProgressDialog(); HttpUtil.sendHttpRequest(address, new HttpCallbackListener() { @Override public void onFinish(String response) { boolean result = false; if ("province".equals(type)) { result = Utility.handleProvincesResponse(coolWeatherDB, response); } else if ("city".equals(type)) { result = Utility.handleCitiesResponse(coolWeatherDB, response, selectedProvince.getId()); } else if ("county".equals(type)) { result = Utility.handleCountiesResponse(coolWeatherDB, response, selectedCity.getId()); } if (result) { // 通过runOnUiThread()方法回到主线程处理逻辑 runOnUiThread(new Runnable() { @Override public void run() { closeProgressDialog(); if ("province".equals(type)) { queryProvinces(); } else if ("city".equals(type)) { queryCities(); } else if ("county".equals(type)) { queryCounties(); } } }); } } @Override public void onError(Exception e) { // 通过runOnUiThread()方法回到主线程处理逻辑 runOnUiThread(new Runnable() { @Override public void run() { closeProgressDialog(); Toast.makeText(ChooseAreaActivity.this, "加载失败", Toast.LENGTH_SHORT).show(); } }); } }); } /** * 显示进度对话框 */ private void showProgressDialog() { if (progressDialog == null) { progressDialog = new ProgressDialog(this); progressDialog.setMessage("正在加载..."); progressDialog.setCanceledOnTouchOutside(false); } progressDialog.show(); } /** * 关闭进度对话框 */ private void closeProgressDialog() { if (progressDialog != null) { progressDialog.dismiss(); } } /** * 捕获Back按键,根据当前的级别来判断,此时应该返回市列表、省列表、还是直接退出。 */ @Override public void onBackPressed() { if (currentLevel == LEVEL_COUNTY) { queryCities(); } else if (currentLevel == LEVEL_CITY) { queryProvinces(); } else { if (isFromWeatherActivity) { Intent intent = new Intent(this, WeatherActivity.class); startActivity(intent); } finish(); } } }
WeatherActivity
package com.coolweather.app.activity; import com.coolweather.app.R; import com.coolweather.app.service.AutoUpdateService; import com.coolweather.app.util.HttpCallbackListener; import com.coolweather.app.util.HttpUtil; import com.coolweather.app.util.Utility; import android.app.Activity; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.text.TextUtils; import android.view.View; import android.view.Window; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.LinearLayout; import android.widget.TextView; public class WeatherActivity extends Activity implements OnClickListener{ private LinearLayout weatherInfoLayout; /** * 用于显示城市名 */ private TextView cityNameText; /** * 用于显示发布时间 */ private TextView publishText; /** * 用于显示天气描述信息 */ private TextView weatherDespText; /** * 用于显示气温1 */ private TextView temp1Text; /** * 用于显示气温2 */ private TextView temp2Text; /** * 用于显示当前日期 */ private TextView currentDateText; /** * 切换城市按钮 */ private Button switchCity; /** * 更新天气按钮 */ private Button refreshWeather; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.weather_layout); // 初始化各控件 weatherInfoLayout = (LinearLayout) findViewById(R.id.weather_info_layout); cityNameText = (TextView) findViewById(R.id.city_name); publishText = (TextView) findViewById(R.id.publish_text); weatherDespText = (TextView) findViewById(R.id.weather_desp); temp1Text = (TextView) findViewById(R.id.temp1); temp2Text = (TextView) findViewById(R.id.temp2); currentDateText = (TextView) findViewById(R.id.current_date); switchCity = (Button) findViewById(R.id.switch_city); refreshWeather = (Button) findViewById(R.id.refresh_weather); String countyCode = getIntent().getStringExtra("county_code"); if (!TextUtils.isEmpty(countyCode)) { // 有县级代号时就去查询天气 publishText.setText("同步中..."); weatherInfoLayout.setVisibility(View.INVISIBLE); cityNameText.setVisibility(View.INVISIBLE); queryWeatherCode(countyCode); } else { // 没有县级代号时就直接显示本地天气 showWeather(); } switchCity.setOnClickListener(this); refreshWeather.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.switch_city: Intent intent = new Intent(this, ChooseAreaActivity.class); intent.putExtra("from_weather_activity", true); startActivity(intent); finish(); break; case R.id.refresh_weather: publishText.setText("同步中..."); SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); String weatherCode = prefs.getString("weather_code", ""); if (!TextUtils.isEmpty(weatherCode)) { queryWeatherInfo(weatherCode); } break; default: break; } } /** * 查询县级代号所对应的天气代号。 */ private void queryWeatherCode(String countyCode) { String address = "http://www.weather.com.cn/data/list3/city" + countyCode + ".xml"; queryFromServer(address, "countyCode"); } /** * 查询天气代号所对应的天气。 */ private void queryWeatherInfo(String weatherCode) { String address = "http://www.weather.com.cn/data/cityinfo/" + weatherCode + ".html"; queryFromServer(address, "weatherCode"); } /** * 根据传入的地址和类型去向服务器查询天气代号或者天气信息。 */ private void queryFromServer(final String address, final String type) { HttpUtil.sendHttpRequest(address, new HttpCallbackListener() { @Override public void onFinish(final String response) { if ("countyCode".equals(type)) { if (!TextUtils.isEmpty(response)) { // 从服务器返回的数据中解析出天气代号 String[] array = response.split("\\|"); if (array != null && array.length == 2) { String weatherCode = array[1]; queryWeatherInfo(weatherCode); } } } else if ("weatherCode".equals(type)) { // 处理服务器返回的天气信息 Utility.handleWeatherResponse(WeatherActivity.this, response); runOnUiThread(new Runnable() { @Override public void run() { showWeather(); } }); } } @Override public void onError(Exception e) { runOnUiThread(new Runnable() { @Override public void run() { publishText.setText("同步失败"); } }); } }); } /** * 从SharedPreferences文件中读取存储的天气信息,并显示到界面上。 */ private void showWeather() { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); cityNameText.setText( prefs.getString("city_name", "")); temp1Text.setText(prefs.getString("temp1", "")); temp2Text.setText(prefs.getString("temp2", "")); weatherDespText.setText(prefs.getString("weather_desp", "")); publishText.setText("今天" + prefs.getString("publish_time", "") + "发布"); currentDateText.setText(prefs.getString("current_date", "")); weatherInfoLayout.setVisibility(View.VISIBLE); cityNameText.setVisibility(View.VISIBLE); Intent intent = new Intent(this, AutoUpdateService.class); startService(intent); } }
AndroidManifest.xml,第一是添加了访问网络的权限,第二是将ChooseAreaActivity配置成主活动,这样一旦打开程序就会直接进入ChooseAreaActivity了。
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.coolweather.app" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="17" /> <uses-permission android:name="android.permission.INTERNET" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.coolweather.app.activity.ChooseAreaActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="com.coolweather.app.activity.WeatherActivity"></activity> <service android:name="com.coolweather.app.service.AutoUpdateService"></service> <receiver android:name="com.coolweather.app.receiver.AutoUpdateReceiver"></receiver> </application> </manifest>
时间: 2024-12-26 20:54:16