android很简单的天气预报例子和XML解析

android很简单的天气预报例子和XML解析_第1张图片

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    >    <LinearLayout    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:orientation="horizontal"    >    <EditText android:id="@+id/CityName"  android:layout_width="250dp"  android:layout_height="wrap_content" android:layout_marginTop="2dip" android:text="shenzhen"></EditText><Button android:id="@+id/ButtonGo"  android:layout_width="70dp"  android:layout_height="wrap_content" android:layout_gravity="right|top"  android:text="go!go!"></Button>    </LinearLayout>    <TextView      android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:scrollbars="vertical"    android:background="#ffffff"    android:textColor="#000000"android:id="@+id/infoText"    />    </LinearLayout>

weatherActivity.java

public class weatherActivity extends Activity {private Button mButton = null;private TextView mTextView = null;private EditText mCityNameEdit = null;final String DEBUG_TAG = "weather";    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                mTextView = (TextView)findViewById(R.id.infoText);        mTextView.setMovementMethod(ScrollingMovementMethod.getInstance());         mCityNameEdit = (EditText)findViewById(R.id.CityName);        mButton = (Button) findViewById(R.id.ButtonGo);        mButton.setOnClickListener(new Button.OnClickListener() {            public void onClick(View v) {                        connect();                                }        });                    }}

1.连接网络，基于Http协议。

一般是发送请求到某个应用服务器。此时需要用到HttpURLConnection，打开连接，获得数据流，读取数据流。

    private void connect()    {//http地址//String httpUrl = "http://flash.weather.com.cn/wmaps/xml/shenzhen.xml";String httpUrl = "http://flash.weather.com.cn/wmaps/xml/"+mCityNameEdit.getText().toString()+".xml";String resultData = "";//获得的数据URL url = null;try{//构造一个URL对象url = new URL(httpUrl); }catch (MalformedURLException e){Log.e(DEBUG_TAG, "MalformedURLException");}if (url != null){try{//使用HttpURLConnection打开连接HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();//得到读取的内容(流)InputStreamReader in = new InputStreamReader(urlConn.getInputStream());// 为输出创建BufferedReaderBufferedReader buffer = new BufferedReader(in);String inputLine = null;//使用循环来读取获得的数据while (((inputLine = buffer.readLine()) != null)){//我们在每一行后面加上一个"\n"来换行resultData += inputLine + "\n";}  in.close();urlConn.disconnect();//设置显示取得的内容if ( resultData != null ){mTextView.setText("");weatherInfoXmlPullParser(resultData);//解析XML}else {mTextView.setText("读取的内容为NULL");}}catch (IOException e){Log.e(DEBUG_TAG, "IOException");}}else{Log.e(DEBUG_TAG, "Url NULL");}    }

2.用PULL方式解析xml

PULL方式读xml会回调事件：

读取到xml的声明返回 START_DOCUMENT;
读取到xml的结束返回 END_DOCUMENT ;
读取到xml的开始标签返回 START_TAG
读取到xml的结束标签返回 END_TAG
读取到xml的文本返回 TEXT

    public void weatherInfoXmlPullParser(String buffer){            XmlPullParser xmlParser = Xml.newPullParser();//获得XmlPullParser解析器           ByteArrayInputStream tInputStringStream = null;    if (buffer != null && !buffer.trim().equals(""))    {       tInputStringStream = new ByteArrayInputStream(buffer.getBytes());    }    else    {    return ;    }    try     {    //得到文件流，并设置编码方式    //InputStream inputStream=mContext.getResources().getAssets().open(fileName);    //xmlParser.setInput(inputStream, "utf-8");    xmlParser.setInput(tInputStringStream, "UTF-8");        //获得解析到的事件类别，这里有开始文档，结束文档，开始标签，结束标签，文本等等事件。    int evtType=xmlParser.getEventType();         while(evtType!=XmlPullParser.END_DOCUMENT)//一直循环，直到文档结束       {     switch(evtType)    {     case XmlPullParser.START_TAG:    String tag = xmlParser.getName();     //如果是city标签开始，则说明需要实例化对象了    if (tag.equalsIgnoreCase("city"))     {     weatherInfo info = new weatherInfo();     //取出标签中的一些属性值    info.setCityWeatherInfo(xmlParser);    mTextView.append(info.getCityWeatherInfo()+"\n");    }    break;                     case XmlPullParser.END_TAG:    //标签结束         default:break;    }    //如果xml没有结束，则导航到下一个节点    evtType=xmlParser.next();    }    }     catch (XmlPullParserException e) {             // TODO Auto-generated catch block             e.printStackTrace();    }    catch (IOException e1) {             // TODO Auto-generated catch block             e1.printStackTrace();    }     }

weatherInfo.java

public class weatherInfo{static String cityname = "深圳";    static String stateDetailed ="多云转阵雨";    static String tem1 ="28";     static String tem2 ="22";     static String temNow ="25";    static String windState="微风";    static String windDir="北风";    static String windPower="2级";    static String humidity="63%";    static String time="10:30";        public void setCityWeatherInfo(XmlPullParser xmlParser)    {    cityname = xmlParser.getAttributeValue(null, "cityname");    stateDetailed = xmlParser.getAttributeValue(null, "stateDetailed");    tem1 = xmlParser.getAttributeValue(null, "tem1");    tem2 = xmlParser.getAttributeValue(null, "tem2");    temNow = xmlParser.getAttributeValue(null, "temNow");    windState = xmlParser.getAttributeValue(null, "windState");    windDir = xmlParser.getAttributeValue(null, "windDir");    windPower = xmlParser.getAttributeValue(null, "windPower");    humidity = xmlParser.getAttributeValue(null, "humidity");    time = xmlParser.getAttributeValue(null, "time");    }        public String getCityWeatherInfo()    {    String info = "所在城市："+cityname + "\n"+"天气情况："+stateDetailed + ", 湿度：" +humidity + "\n"+"现在气温："+temNow + "°C, "+"最低："+tem2 + "°C, "+"最高："+tem1 + "°C\n"+"风情："+windState +", 风向："+windDir + ", 风力："+windPower + "\n"+"更新时间："+time + "\n";    return info;    }}

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