使用AutoCompleteTextView和AsyncTask 检索城市

最新推荐文章于 2018-11-15 16:47:17 发布

转载最新推荐文章于 2018-11-15 16:47:17 发布 · 118 阅读

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原文链接：https://my.oschina.net/u/2542711/blog/603564

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#移动开发 #python

2019独角兽企业重金招聘Python工程师标准>>>

使用AutoCompleteTextView和AsyncTask 检索城市

功能：一个AutoCompleteTextView 输入一个城市名的第一个字时
自动检索所有城市第一个有相同的字
//记得配置联网权限

1、在布局界面布局 activity_main.xml

代码

</RelativeLayout>

-------------------------

2、MainActivity 类

代码

public class MainActivity extends Activity {
private AutoCompleteTextView auto;
private ArrayAdapter<String> adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  this.auto = (AutoCompleteTextView) this.findViewById(R.id.autocompletetextview);


  //需要有该文件
  String url = "http://192.168.10.50:8080/xml/citys_weather.xml";
  new MyAsyncTask().execute(url);
}

class MyAsyncTask extends AsyncTask<String, Void, byte[]>{

  @Override
  protected byte[] doInBackground(String... params) {
   String url = params[0];
   HttpGet get = new HttpGet(url);
   HttpClient client = new DefaultHttpClient();
   try {
    HttpResponse response = client.execute(get);
    if(response.getStatusLine().getStatusCode() == 200){
     return EntityUtils.toByteArray(response.getEntity());
    }
   } catch (ClientProtocolException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   return null;

  }
  @Override
  protected void onPostExecute(byte[] result) {
   super.onPostExecute(result);
   if(result != null){
    //Xml.newPullParser -- 解析器
    XmlPullParser parser = Xml.newPullParser();
    ByteArrayInputStream bis = new ByteArrayInputStream(result);
    try {
     parser.setInput(bis, "utf-8");
     List<String> list = city_list(parser);
      adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1,list);
      auto.setAdapter(adapter);
    } catch (XmlPullParserException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }else{
    Toast.makeText(MainActivity.this, "网络异常", Toast.LENGTH_SHORT).show();
   }
  }
  private List<String> city_list(XmlPullParser parser) {
   List<String> list = new ArrayList<String>();
   try {
    int event = parser.getEventType();
    while(event != XmlPullParser.END_DOCUMENT){
     switch(event){
     case XmlPullParser.START_TAG:
      if("d".equals(parser.getName())){
       list.add(parser.nextText());
      }
     }
     event = parser.next();
    }
   } catch (Exception e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }

   return list;
  }

}
}