<Android 应用 之路> 天气预报（三）

昨天介绍了基本的载入界面，今天介绍下天气信息显示界面的代码

基本ListView显示

搜索框，查询城市

上一篇文章中，载入界面通过showWeatherInfo()方法跳转到天气信息显示界面

private void showWeatherInfo() {
Bundle bundle = new Bundle();//bundle用来传递weatherinfolist
bundle.putSerializable(Utils.WEATHERINFO, (Serializable) weatherInfoList);
Intent intent = new Intent(MyActivity.this, MainActivity.class);
//跳转到MainActivity
intent.putExtra(Utils.WEATHERINFO, bundle);
startActivity(intent);
finish();//结束当前Activity
}

如下是用于显示天气信息的MainActivity的内容，注意注释

public class MainActivity extends Activity {

//定义TAG是用来打Log的
private static final String TAG = "MyActivity";
private ListView mListView;//ListView用来显示天气信息
private WeatherAdapter mWeatherAdapter;//ListView对应的Adapter
private EditText mSearchEt;//搜索框

private ArrayList<WeatherInfo> weatherInfoList;//全部天气信息List
private ArrayList<WeatherInfo> resultList;//根据搜索框输入的内容显示的结果List

/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.main);
resultList = new ArrayList<WeatherInfo>();

Intent intent = getIntent();
Bundle bundle = intent.getBundleExtra(Utils.WEATHERINFO);//获取Intent中携带的信息
weatherInfoList = (ArrayList<WeatherInfo>) bundle.getSerializable(Utils.WEATHERINFO);
Log.e(TAG, "weatherinfo = " + weatherInfoList.toString());

mSearchEt = (EditText) findViewById(R.id.et_search);
mListView = (ListView) findViewById(R.id.lvView);
mWeatherAdapter = new WeatherAdapter(this, weatherInfoList);
mListView.setAdapter(mWeatherAdapter);

//设置TextWathcer()根据输入框的文本变化显示不同的list
mSearchEt.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}

@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}

@Override
public void afterTextChanged(Editable editable) {
resultList.clear();
String searchstr = mSearchEt.getText().toString();
if(searchstr==null) {
mWeatherAdapter.setWeatherInfoList(weatherInfoList);
mWeatherAdapter.notifyDataSetChanged();
} else {
for (int i = 0; i < weatherInfoList.size(); i++) {
String cityname = weatherInfoList.get(i).getCity();
if (cityname.contains(searchstr) || searchstr.contains(cityname)) {
resultList.add(weatherInfoList.get(i));
}
}
//更新Adatper对应的数据
mWeatherAdapter.setWeatherInfoList(resultList);
mWeatherAdapter.notifyDataSetChanged();
}
}
});
}
}

看看WeatherAdapter的代码，WeatherAdapter继承BaseAdapter

//继承BaseAdapter，需要复写几个方法
public class WeatherAdapter extends BaseAdapter {
private static final String TAG = "WeatherAdapter";
private Context context;
private List<WeatherInfo> weatherInfoList;

public WeatherAdapter(Context context, List<WeatherInfo> weatherInfoList) {
this.context = context;
this.weatherInfoList = weatherInfoList;
}

@Override
public int getCount() {
return weatherInfoList.size();
}//list的size

@Override
public WeatherInfo getItem(int i) {
return weatherInfoList.get(i);
}//获取天气信息

@Override
public long getItemId(int i) {
return i;
}//获取Item的id

@Override
public View getView(int i, View view, ViewGroup viewGroup) {
//这个方法比较关键，返回Item view
if (view == null) {
view = LayoutInflater.from(context).inflate(R.layout.listviewitem, null);
}

ImageView weatherimage = (ImageView) view.findViewById(R.id.weatherimage);
TextView cityname = (TextView) view.findViewById(R.id.cityname);
TextView temp = (TextView) view.findViewById(R.id.temp);
TextView weather = (TextView) view.findViewById(R.id.weather);

WeatherInfo weatherInfo = weatherInfoList.get(i);
cityname.setText(weatherInfo.getCity());
temp.setText(weatherInfo.getTemp1() + " ~ " + weatherInfo.getTemp2());
String weatherstr = weatherInfo.getWeather();
weather.setText(weatherstr);
//这里大致使用几个图片，具体做法，不同的json数据查询api中应该可以查询到支持的天气种类，根据查询到的种类设置不用的图片，这里暂且只分为4种，避免我的apk界面太丑 不忍直视
if(weatherstr.contains("雨")) {
weatherimage.setImageResource(R.drawable.rain);
} else if(weatherstr.contains("阴")) {
weatherimage.setImageResource(R.drawable.yin);
} else if(weatherstr.contains("云")) {
weatherimage.setImageResource(R.drawable.cloud);
} else if(weatherstr.contains("雪")) {
weatherimage.setImageResource(R.drawable.snow);
} else {
weatherimage.setImageResource(R.drawable.sun);
}
return view;

}
//方便替换List
public void setWeatherInfoList(List<WeatherInfo> list) {
this.weatherInfoList = list;
}
}

基本效果图：（录屏大师录屏）



源代码下载路径：

http://download.csdn.net/detail/poorkick/9510243

缺陷：

1. 每次进入需要载入数据，可以替换成根据时间戳判断是否数据有更新,当然这个对查询借口有点依赖，本地通过数据库存储当前信息

2. 天气信息由于使用的是气象台的，数据更新自己本身无法掌握，可以替换成其他查询接口

3. 后续可能会再做一个更完善的天气预报应用，采用新的查询接口和UI界面

界面简陋，代码不完善，见谅，工作之余练手之作。