Android之Volley使用

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Volley使用demo：

public class MainActivity extends Activity {     private RequestQueue mQueue;     private TextView tv;     private ImageView iv;     private Button sr,btn2,btn3,btn4,btn5,btn6,btn7;     private NetworkImageView netImageView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mQueue=Volley.newRequestQueue(getApplicationContext());        initView();    }    private void initView() {        // TODO Auto-generated method stub        tv=(TextView) findViewById(R.id.tv_1);        iv=(ImageView) findViewById(R.id.iv_1);        sr=(Button) findViewById(R.id.btn_1);        sr.setOnClickListener(new Listener());        btn2=(Button) findViewById(R.id.btn_2);        btn2.setOnClickListener(new Listener());        btn3=(Button) findViewById(R.id.btn_3);        btn3.setOnClickListener(new Listener());        btn4=(Button) findViewById(R.id.btn_4);        btn4.setOnClickListener(new Listener());        btn5=(Button) findViewById(R.id.btn_5);        btn5.setOnClickListener(new Listener());        btn6=(Button) findViewById(R.id.btn_6);        btn6.setOnClickListener(new Listener());        btn7=(Button) findViewById(R.id.btn_7);        btn7.setOnClickListener(new Listener());        netImageView=(NetworkImageView) findViewById(R.id.network_imageView);    }    class Listener implements OnClickListener{        @Override        public void onClick(View v) {            switch(v.getId()){            case R.id.btn_1:                loadGetStr("http://www.baidu.com");                break;            case R.id.btn_2:                loadPostStr("");                break;            case R.id.btn_3:                loadGetJson("http://www.imooc.com/api/teacher?type=4&num=30");                break;            case R.id.btn_4:                networkImageViewUse(netImageView, "http://img.taopic.com/uploads/allimg/120331/2722-12033109302882.jpg");                break;            case R.id.btn_5:                loadeXMLRequest("http://flash.weather.com.cn/wmaps/xml/china.xml");                break;            case R.id.btn_6:                loadJsonResponse("http://www.weather.com.cn/data/sk/101010100.html");                           break;            case R.id.btn_7:                getImageLoader(iv, "http://img.taopic.com/uploads/allimg/120331/2722-12033109302882.jpg");                          break;            }        }}    //返回String 网络请求Get方法    private void loadGetStr(String url){        StringRequest stringRequest=new StringRequest(url, new Response.Listener<String>() {            @Override            public void onResponse(String response) {                 Log.d("TAG", response);                   tv.setText(response);            }        }, new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError error) {                // TODO Auto-generated method stub                Log.d("TAG",error.getMessage());                tv.setText(error.getMessage());            }        } );        //设置是否缓存    失败了，不明白为啥        stringRequest.setShouldCache(true);         mQueue.add(stringRequest);        mQueue.start();    }    //返回string，网络请求Post    private void loadPostStr(String url){        StringRequest stringRequest = new StringRequest(Method.POST, url,  new Response.Listener<String>() {            @Override            public void onResponse(String response) {                // TODO Auto-generated method stub            }        }, new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError error) {                // TODO Auto-generated method stub            }        }) {              @Override              protected Map<String, String> getParams() throws AuthFailureError {                  Map<String, String> map = new HashMap<String, String>();                  map.put("params1", "value1");                  map.put("params2", "value2");                  return map;              }          };      }    //返回json  网络get请求    private void loadGetJson(String url){        JsonObjectRequest jr=new JsonObjectRequest(url,null, new Response.Listener<JSONObject>() {            @Override            public void onResponse(JSONObject response) {                 tv.setText(response.toString());            }        }, new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError error) {                // TODO Auto-generated method stub                tv.setText(error.getMessage());            }        });        mQueue.add(jr);        mQueue.start();    }    //newwork控件 请求图片    @SuppressWarnings("unused")    private void networkImageViewUse(NetworkImageView iv, String url) {          ImageLoader imLoader = new ImageLoader(mQueue, new BitmapCache());          //请求图片之前显示的图片        iv.setDefaultImageResId(R.drawable.ic_launcher);       // 请求图片失败显示的图片        iv.setErrorImageResId(R.drawable.ic_launcher);          iv.setImageUrl(url, imLoader);      }      //图片一级缓存处理    public class BitmapCache implements ImageCache {          private LruCache<String, Bitmap> mCache;          public BitmapCache() {              int maxSize = 10 * 1024 * 1024;              mCache = new LruCache<String, Bitmap>(maxSize) {                  @Override                  protected int sizeOf(String key, Bitmap bitmap) {                      return bitmap.getRowBytes() * bitmap.getHeight();                  }              };          }          @Override          public Bitmap getBitmap(String url) {              return mCache.get(url);          }          @Override          public void putBitmap(String url, Bitmap bitmap) {              mCache.put(url, bitmap);          }      }      // XML     private void loadeXMLRequest(String url){        XMLRequest xmlRequest=new XMLRequest(url, new Response.Listener<XmlPullParser>() {            @Override            public void onResponse(XmlPullParser response) {                // TODO Auto-generated method stub                try {                      int eventType = response.getEventType();                      while (eventType != XmlPullParser.END_DOCUMENT) {                          switch (eventType) {                          case XmlPullParser.START_TAG:                              String nodeName = response.getName();                              if ("city".equals(nodeName)) {                                  String pName = response.getAttributeValue(0);                                  Log.d("TAG", "pName is " + pName);                                 tv.setText(pName);                            }                              break;                          }                          eventType = response.next();                      }                  } catch (XmlPullParserException e) {                      e.printStackTrace();                  } catch (IOException e) {                      e.printStackTrace();                  }              }          }, new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError error) {                tv.setText(error.getMessage());            }        });        mQueue.add(xmlRequest);     }    //json    @SuppressWarnings({ "unused", "unchecked" })    private void loadJsonResponse(String url){        GsonRequest<Weather> gsonRequest=new GsonRequest(url, Weather.class, new Response.Listener<Weather>() {            @Override            public void onResponse(Weather weather) {                WeatherInfo weatherInfo=weather.getWeatherinfo();                   Log.d("TAG", "city is " + weatherInfo.getCity());                      Log.d("TAG", "temp is " + weatherInfo.getTemp());                      Log.d("TAG", "time is " + weatherInfo.getTime());                    tv.setText(weatherInfo.getCity());            }        }, new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError error) {                // TODO Auto-generated method stub                tv.setText(error.getMessage());            }        });        mQueue.add(gsonRequest);    }    //ImageLoader 请求图片    private void getImageLoader(ImageView iv,String url){        ImageLoader il=new ImageLoader(mQueue, new BitmapCache());        ImageListener listener = ImageLoader.getImageListener(iv,                  R.drawable.ic_launcher, R.drawable.ic_launcher);         il.get(url, listener, 200, 200);    }}

GsonRequest集成：

import java.io.UnsupportedEncodingException;import com.android.volley.NetworkResponse;import com.android.volley.ParseError;import com.android.volley.Request;import com.android.volley.Response;import com.android.volley.Response.ErrorListener;import com.android.volley.Response.Listener;import com.android.volley.toolbox.HttpHeaderParser;import com.google.gson.Gson;public class GsonRequest<T> extends Request<T> {      private final Listener<T> mListener;      private Gson mGson;      private Class<T> mClass;      public GsonRequest(int method, String url, Class<T> clazz, Listener<T> listener,              ErrorListener errorListener) {          super(method, url, errorListener);          mGson = new Gson();          mClass = clazz;          mListener = listener;      }      public GsonRequest(String url, Class<T> clazz, Listener<T> listener,              ErrorListener errorListener) {          this(Method.GET, url, clazz, listener, errorListener);      }      @Override      protected Response<T> parseNetworkResponse(NetworkResponse response) {          try {              String jsonString = new String(response.data,                      HttpHeaderParser.parseCharset(response.headers));              return Response.success(mGson.fromJson(jsonString, mClass),                      HttpHeaderParser.parseCacheHeaders(response));          } catch (UnsupportedEncodingException e) {              return Response.error(new ParseError(e));          }      }      @Override      protected void deliverResponse(T response) {          mListener.onResponse(response);      }  }

XMLRequest 集成：

import java.io.StringReader;import java.io.UnsupportedEncodingException;import org.xmlpull.v1.XmlPullParser;import org.xmlpull.v1.XmlPullParserException;import org.xmlpull.v1.XmlPullParserFactory;import com.android.volley.NetworkResponse;import com.android.volley.ParseError;import com.android.volley.Request;import com.android.volley.Response;import com.android.volley.Response.ErrorListener;import com.android.volley.Response.Listener;import com.android.volley.toolbox.HttpHeaderParser;public class XMLRequest extends Request<XmlPullParser> {      private final Listener<XmlPullParser> mListener;      public XMLRequest(int method, String url, Listener<XmlPullParser> listener,              ErrorListener errorListener) {          super(method, url, errorListener);          mListener = listener;      }      public XMLRequest(String url, Listener<XmlPullParser> listener, ErrorListener errorListener) {          this(Method.GET, url, listener, errorListener);      }      @Override      protected Response<XmlPullParser> parseNetworkResponse(NetworkResponse response) {          try {              String xmlString = new String(response.data,                      HttpHeaderParser.parseCharset(response.headers));              XmlPullParserFactory factory = XmlPullParserFactory.newInstance();              XmlPullParser xmlPullParser = factory.newPullParser();              xmlPullParser.setInput(new StringReader(xmlString));              return Response.success(xmlPullParser, HttpHeaderParser.parseCacheHeaders(response));          } catch (UnsupportedEncodingException e) {              return Response.error(new ParseError(e));          } catch (XmlPullParserException e) {              return Response.error(new ParseError(e));          }      }      @Override      protected void deliverResponse(XmlPullParser response) {          mListener.onResponse(response);      }  }

public class Weather {     private WeatherInfo weatherinfo;     public WeatherInfo getWeatherinfo() {        return weatherinfo;    }    public void setWeatherinfo(WeatherInfo weatherinfo) {        this.weatherinfo = weatherinfo;    }     class WeatherInfo {     private String city;          private String temp;          private String time;        public String getCity() {            return city;        }        public void setCity(String city) {            this.city = city;        }        public String getTemp() {            return temp;        }        public void setTemp(String temp) {            this.temp = temp;        }        public String getTime() {            return time;        }        public void setTime(String time) {            this.time = time;        }      } }

VolleyErrorHelper 集成

import java.util.HashMap;  import java.util.Map;  import android.content.Context;  import com.android.volley.AuthFailureError;  import com.android.volley.NetworkError;  import com.android.volley.NetworkResponse;  import com.android.volley.NoConnectionError;  import com.android.volley.ServerError;  import com.android.volley.TimeoutError;  import com.android.volley.VolleyError;  import com.csun.sos.R;import com.google.gson.Gson;  import com.google.gson.reflect.TypeToken;  public class VolleyErrorHelper {      /**      * Returns appropriate message which is to be displayed to the user against      * the specified error object.      *       * @param error      * @param context      * @return      */      public static String getMessage(Object error, Context context) {          if (error instanceof TimeoutError) {              return context.getResources().getString(                      R.string.generic_server_down);          } else if (isServerProblem(error)) {              return handleServerError(error, context);          } else if (isNetworkProblem(error)) {              return context.getResources().getString(R.string.no_internet);          }          return context.getResources().getString(R.string.generic_error);      }      /**      * Determines whether the error is related to network      *       * @param error      * @return      */      private static boolean isNetworkProblem(Object error) {          return (error instanceof NetworkError)                  || (error instanceof NoConnectionError);      }      /**      * Determines whether the error is related to server      *       * @param error      * @return      */      private static boolean isServerProblem(Object error) {          return (error instanceof ServerError)                  || (error instanceof AuthFailureError);      }      /**      * Handles the server error, tries to determine whether to show a stock      * message or to show a message retrieved from the server.      *       * @param err      * @param context      * @return      */      private static String handleServerError(Object err, Context context) {          VolleyError error = (VolleyError) err;          NetworkResponse response = error.networkResponse;          if (response != null) {              switch (response.statusCode) {              case 404:              case 422:              case 401:                  try {                      // server might return error like this { "error":                      // "Some error occured" }                      // Use "Gson" to parse the result                      HashMap<String, String> result = new Gson().fromJson(                              new String(response.data),                              new TypeToken<Map<String, String>>() {                              }.getType());                      if (result != null && result.containsKey("error")) {                          return result.get("error");                      }                  } catch (Exception e) {                      e.printStackTrace();                  }                  // invalid request                  return error.getMessage();              default:                  return context.getResources().getString(                          R.string.generic_server_down);              }          }          return context.getResources().getString(R.string.generic_error);      }  }

Volley，Gson库

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