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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
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
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