android 网络请求库volley方法详解

使用volley进行网络请求：需先将volley包导入androidstudio中

File下的Project Structrue，点加号导包

 

volley网络请求步骤：

      1. 创建请求队列       RequestQueue queue = Volley.newRequestQueue(this);

      2.创建请求对象（3种）    

                       StringRequest request = new StringRequest（“请求方法”，“请求的网络地址”，“成功的网络回调”，“失败的网络回调”）；

                       ImageRequest request = new ImageRequest（“图片路径”，“成功的回调函数”，“图片宽度”，“图片高度”，“图片的颜色属性”，“失败的网络回调”）；

                       Jsonrequest request = new Jsonrequest（）；

      3.把请求对象放入请求队列     queue.add(request);

 // 注销请求：重写onstop方法
 @Override
  protected void onStop() {
   super.onStop();
   
   queue.cancelAll(this);
   
   queue.cancelAll("get");
   
   queue.cancelAll("post");
  }
//设置当前请求的优先级：重写getPriority方法
@Override
public Priority getPriority() {
 return Priority.LOW;
}
//设置请求头：重写GetHeader方法
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
 Map<String,String> map = new HashMap<String, String>();
 map.put("apikey","fc642e216cd19906f642ee930ce28174");
 return map;
}
//传递参数：重写GetParams方法
@Override
protected Map<String, String> getParams() throws AuthFailureError {
 Map<String,String> map = new HashMap<String, String>();
 map.put("num","10");
 map.put("page","1");
 map.put("word","%E6%9E%97%E4%B8%B9");
 return map;
}

代码部分：

xml文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 android:orientation="vertical"
 tools:context="com.jredu.helloworld.activity.VolleyActivity">
 <WebView
  android:id="@+id/volleyWebView"
  android:layout_width="match_parent"
  android:layout_height="300dp">
 </WebView>
 <ImageView
  android:id="@+id/img"
  android:layout_width="match_parent"
  android:layout_height="wrap_content" />
 <Button
  android:id="@+id/volleyButton"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_marginTop="5dp"
  android:textAllCaps="false"
  android:text="Volley"/>
 <Button
  android:id="@+id/imgButton"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_marginTop="5dp"
  android:textAllCaps="false"
  android:text="Volley获取图片"/>
</LinearLayout>

  activity文件：

package com.jredu.helloworld.activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.ImageView;
import com.android.volley.AuthFailureError;
import com.android.volley.NetworkResponse;
import com.android.volley.ParseError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.HttpHeaderParser;
import com.android.volley.toolbox.ImageRequest;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.jredu.helloworld.R;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
public class VolleyActivity extends AppCompatActivity {
 WebView webView;
 Button button;
 Button imgButton;
 ImageView img;
 RequestQueue queue = null;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_volley);
  queue = Volley.newRequestQueue(this);
  webView = (WebView) findViewById(R.id.volleyWebView);
  img = (ImageView) findViewById(R.id.img);
  button = (Button) findViewById(R.id.volleyButton);
  button.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    doStringVolley2();
    doStringVolley();
   }
  });
  imgButton = (Button) findViewById(R.id.imgButton);
  imgButton.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    GetImg();
   }
  });
 }
 
 public void doStringVolley(){
  
  //RequestQueue queue = Volley.newRequestQueue(this);
  
  StringRequest request = new StringRequest(
    Request.Method.GET,
    "http://apis.baidu.com/txapi/tiyu/tiyu?num=10&page=1&word=%E6%9E%97%E4%B8%B9",
    
    new Response.Listener<String>() {
     @Override
     public void onResponse(String response) {
      String s = response;
      webView.getSettings().setDefaultTextEncodingName("utf-8");
      webView.getSettings().setJavaScriptEnabled(true);
      webView.loadDataWithBaseURL(null,s,"text/html","utf-8",null);
     }
    },
    new Response.ErrorListener() {
     @Override
     public void onErrorResponse(VolleyError error) {
      webView.loadDataWithBaseURL(null,"网络连接失败!!!","text/html","utf-8",null);
     }
    }
  ){
   
   @Override
   public Map<String, String> getHeaders() throws AuthFailureError {
    Map<String,String> map = new HashMap<String, String>();
    map.put("apikey","fc642e216cd19906f642ee930ce28174");
    return map;
   }
   
   @Override
   protected Response<String> parseNetworkResponse(
     NetworkResponse response) {
    try {
     String jsonObject = new String(
       new String(response.data, "UTF-8"));
     return  Response.success(jsonObject, HttpHeaderParser.parseCacheHeaders(response));
    } catch (UnsupportedEncodingException e) {
     return Response.error(new ParseError(e));
    } catch (Exception je) {
     return Response.error(new ParseError(je));
    }
   }
   
   @Override
   public Priority getPriority() {
    return Priority.LOW;
   }
  };
  request.setTag("get");
  
  queue.add(request);
 }
 
 public void doStringVolley2(){
  
  //RequestQueue queue = Volley.newRequestQueue(this);
  
  StringRequest request = new StringRequest(
    Request.Method.POST,
    "http://www.baidu.com",
    new Response.Listener<String>() {
     @Override
     public void onResponse(String response) {
      String s = response;
      webView.getSettings().setDefaultTextEncodingName("utf-8");
      webView.getSettings().setJavaScriptEnabled(true);
      webView.loadDataWithBaseURL(null,s,"text/html","utf-8",null);
     }
    },
    new Response.ErrorListener() {
     @Override
     public void onErrorResponse(VolleyError error) {
      webView.loadDataWithBaseURL(null,"网络连接失败!!!","text/html","utf-8",null);
     }
    }
  ){
   
   @Override
   protected Map<String, String> getParams() throws AuthFailureError {
    Map<String,String> map = new HashMap<String, String>();
    map.put("num","10");
    map.put("page","1");
    map.put("word","%E6%9E%97%E4%B8%B9");
    return map;
   }
   
   @Override
   public Priority getPriority() {
    return Priority.HIGH;
   }
  };
  request.setTag("post");
  
  queue.add(request);
 }
 
 public void GetImg(){
  ImageRequest request = new ImageRequest(
    "https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png",
    new Response.Listener<Bitmap>() {
     @Override
     public void onResponse(Bitmap response) {
      img.setImageBitmap(response);
     }
    },
    5000,
    5000,
    Bitmap.Config.ARGB_8888,
    new Response.ErrorListener() {
     @Override
     public void onErrorResponse(VolleyError error) {
      img.setImageResource(R.drawable.first5);
     }
    }
  );
  queue.add(request);
 }
 
 @Override
 protected void onStop() {
  super.onStop();
  
  queue.cancelAll(this);
  
  queue.cancelAll("get");
  
  queue.cancelAll("post");
 }
}

以上就是android 网络请求库volley方法 的资料整理，后续继续补充相关资料，谢谢大家对本站的支持！

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