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();
   /*取消当前请求队列的所有请求*/
   queue.cancelall(this);
   /*取消当前请求队列tag为get的请求*/
   queue.cancelall("get");
   /*取消当前请求队列tag为post的请求*/
   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();
   }
  });
 }
 /*get方法*/
 public void dostringvolley(){
  /*创建请求队列*/
  //requestqueue queue = volley.newrequestqueue(this);
  /*创建请求对象*/
  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",
    /*"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);
     }
    }
  ){
   /*设置请求头*/
   @override
   public map<string, string> getheaders() throws authfailureerror {
    map<string,string> map = new hashmap<string, string>();
    map.put("apikey","fc642e216cd19906f642ee930ce28174");
    return map;
   }
   /*解析网络请求结果的方法*/
   @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));
    }
   }
   /*设置当前请求的优先级*/
   @override
   public priority getpriority() {
    return priority.low;
   }
  };
  request.settag("get");
  /*把请求对象放入请求队列*/
  queue.add(request);
 }
 /*post方法*/
 public void dostringvolley2(){
  /*创建请求队列*/
  //requestqueue queue = volley.newrequestqueue(this);
  /*创建请求对象*/
  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);
     }
    }
  ){
   /*重写params方法写参数*/
   @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;
   }
   /*设置请求对象优先级*/
   @override
   public priority getpriority() {
    return priority.high;
   }
  };
  request.settag("post");
  /*把请求对象放入请求队列*/
  queue.add(request);
 }
 /*获取图片*/
 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);
 }
 /*重写onstop方法，用来注销请求*/
 @override
 protected void onstop() {
  super.onstop();
  /*取消当前请求队列的所有请求*/
  queue.cancelall(this);
  /*取消当前请求队列tag为get的请求*/
  queue.cancelall("get");
  /*取消当前请求队列tag为post的请求*/
  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！