android 网络请求库volley方法详解

2019-12-12 05:10:54

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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@Overridepublic Priority getPriority() { return Priority.LOW;}//设置请求头：重写GetHeader方法@Overridepublic 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@Overrideprotected 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！

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