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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

 

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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 one rrorResponse(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 one rrorResponse(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 one rrorResponse(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");    }}

 









android网络请求库volley方法详解