Volley XMLRequest GsonRequest 笔记

package com.moliying.a52_volley;

import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.LruCache;
import android.view.View;
import android.widget.ImageView;

import com.android.volley.AuthFailureError;
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.ImageLoader;
import com.android.volley.toolbox.ImageRequest;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.NetworkImageView;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;

import org.json.JSONObject;

import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

private ImageView iv;
private NetworkImageView networkImageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iv = (ImageView) findViewById(R.id.imageView);
networkImageView = (NetworkImageView) findViewById(R.id.networkImageView);
//创建一个请求对列
queue = Volley.newRequestQueue(this);
}

RequestQueue queue;

public void netWorkImageViewClick(View view){
String path = "http://c.hiphotos.baidu.com/image/pic/item/3bf33a87e950352a3c2372a85043fbf2b3118bd4.jpg";

networkIma
4000
geView.setDefaultImageResId(R.mipmap.ic_launcher);
networkImageView.setErrorImageResId(R.mipmap.ic_launcher);

networkImageView.setImageUrl(path,new ImageLoader(queue,new BitmapCache()));
}

public void sendImageLoaderClick(View view){
String path = "http://c.hiphotos.baidu.com/image/pic/item/3bf33a87e950352a3c2372a85043fbf2b3118bd4.jpg";
ImageLoader loader = new ImageLoader(queue,new BitmapCache());

//参数:imageview,默认显示图片,加载失败显示的图片
ImageLoader.ImageListener listener = ImageLoader.getImageListener(iv,R.mipmap.ic_launcher,R.mipmap.ic_launcher);
//发送请求
loader.get(path,listener,200,200);
}

//ImageCache
class BitmapCache implements ImageLoader.ImageCache{
//LRU算法: 最近最少使用算法
private LruCache<String,Bitmap> cache;//使用LRU
private int maxCache = 10*1024*1024; //10MB
public BitmapCache(){
cache = new LruCache<>(maxCache);
}

//从缓存中获取图片
@Override
public Bitmap getBitmap(String s) {
System.out.println("getBitmap--"+s);
return cache.get(s);
}
//把图片放到缓存中
@Override
public void putBitmap(String s, Bitmap bitmap) {
System.out.println("putBitmap--"+s);
cache.put(s,bitmap);
}
}

public void sendImageRequestClick(View v){
String path = "http://c.hiphotos.baidu.com/image/pic/item/3bf33a87e950352a3c2372a85043fbf2b3118bd4.jpg";
/**
* 第一个参数就是图片的URL地址，这个没什么需要解释的。
第二个参数是图片请求成功的回调，这里我们把返回的Bitmap参数设置到ImageView中。
第三第四个参数分别用于指定允许图片最大的宽度和高度，如果指定的网络图片的宽度或高度大于这里的最大值，则会对图片进行压缩，指定成0的话就表示不管图片有多大，都不会进行压缩。
第五个参数用于指定图片的颜色属性，Bitmap.Config下的几个常量都可以在这里使用，其中ARGB_8888可以展示最好的颜色属性，每个图片像素占据4个字节的大小，而RGB_565则表示每个图片像素占据2个字节大小。
第六个参数是图片请求失败的回调，这里我们当请求失败时在ImageView中显示一张默认图片。
*/
ImageRequest request = new ImageRequest(path, new Response.Listener<Bitmap>() {
@Override
public void onResponse(Bitmap bitmap) {
iv.setImageBitmap(bitmap);
}
}, 0, 0, Bitmap.Config.RGB_565, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
System.out.println(volleyError);
}
});
queue.add(request);
}

/**
* 发送JSON请求
* @param view
*/
public void sendJSONClick(View view){
//        String path = "http://192.168.1.10:8080/51_Server/LoginServlet";
String path = "http://weather.123.duba.net/static/weather_info/101010100.html";
/**
* 参数:请求方式,url,请求参数(JsonObject),响应的回调接口,错误的回调接口
*/
JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, path, null,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject jsonObject) {
System.out.println(jsonObject);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
System.out.println(volleyError);
}
});
queue.add(request);
}

/**
* 使用StringRequest发送一个请求(字符串)
* @param view
*/
public void sendStringClick(View view){
//        stringRequestMethod1();
stringRequestMethod2();
}

/**
* 使用StringRequest发送一个带参数的Post请求
*/
private void stringRequestMethod2(){
String path = "http://192.168.1.10:8080/51_Server/LoginServlet";
Response.Listener listener = new Response.Listener<String>() {
@Override
public void onResponse(String s) {
System.out.println(s);
}
};
Response.ErrorListener errorListener = new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
System.out.println(volleyError);
}
};
StringRequest request = new StringRequest(Request.Method.POST,path,listener,errorListener){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String,String> params = new HashMap<>();
params.put("username","vince");
params.put("password","123");
return params;
}
};
queue.add(request);
}

/**
* StringRequest没有参数的GET请求
*/
private void stringRequestMethod1() {
String path = "http://www.baidu.com";
StringRequest request = new StringRequest(Request.Method.GET,
path, new Response.Listener<String>() {
@Override
public void onResponse(String s) {
System.out.println(s);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
System.out.println(volleyError);
}
});
queue.add(request);//把请求对象添加到对队中
}
}

package com.moliying.a52_volley;

import android.util.Xml;

import com.android.volley.NetworkResponse;
import com.android.volley.ParseError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.toolbox.HttpHeaderParser;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import java.io.StringReader;
import java.io.UnsupportedEncodingException;

/**
* 自定义XMLRequest
*/
public class XMLRequest extends Request<XmlPullParser>{
private final Response.Listener<XmlPullParser> mListener;

public XMLRequest(int method, String url,Response.Listener<XmlPullParser> listener,Response.ErrorListener errorListener) {
super(method, url, errorListener);
this.mListener = listener;
}

@Override
protected Response<XmlPullParser> parseNetworkResponse(NetworkResponse networkResponse) {
try {
String xmlString = new String(networkResponse.data,HttpHeaderParser.parseCharset(networkResponse.headers));
XmlPullParser pull = Xml.newPullParser();
pull.setInput(new StringReader(xmlString));
return Response.success(pull,HttpHeaderParser.parseCacheHeaders(networkResponse));
} catch (XmlPullParserException e) {
e.printStackTrace();
return Response.error(new ParseError(e));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return Response.error(new ParseError(e));
}
}

@Override
protected void deliverResponse(XmlPullParser xmlPullParser) {
mListener.onResponse(xmlPullParser);
}
}

package com.moliying.a52_volley;

import com.android.volley.NetworkResponse;
import com.android.volley.ParseError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.toolbox.HttpHeaderParser;
import com.google.gson.Gson;

import java.io.UnsupportedEncodingException;

/**
* 自定义GsonRequest
* @param <T>
*/
public class GsonRequest<T> extends Request<T> {
private final Response.Listener<T> mListener;
private Gson gson;
private Class<T> mClass;

public GsonRequest(int method, String url, Class<T> mClass, Response.Listener<T> mListener, Response.ErrorListener listener) {
super(method, url, listener);
this.mListener = mListener;
this.mClass = mClass;
}

@Override
protected Response<T> parseNetworkResponse(NetworkResponse networkResponse) {
try {
String jsonString = new String(networkResponse.data, HttpHeaderParser.parseCharset(networkResponse.headers));
return Response.success(gson.fromJson(jsonString, mClass), HttpHeaderParser.parseCacheHeaders(networkResponse));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return Response.error(new ParseError(e));
}

}

@Override
protected void deliverResponse(T t) {
mListener.onResponse(t);
}
}

清单文件权限

<uses-permission android:name="android.permission.INTERNET"/>

布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
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"
tools:context="com.moliying.a52_volley.MainActivity">

<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentStart="true" android:layout_alignParentTop="true"
android:onClick="sendStringClick" android:text="发送一个字符串请求"/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentStart="true" android:layout_below="@+id/button"
android:onClick="sendJSONClick" android:text="发送一个JSON请求"/>
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignEnd="@+id/button2"
android:layout_alignParentStart="true" android:layout_below="@+id/button2"
android:onClick="sendImageRequestClick" android:text="发送一个图片请求"/>
<ImageView
android:id="@+id/imageView"
android:layout_width="200dp"
android:layout_height="200dp"
android:visibility="gone"
android:layout_alignParentStart="true"
android:layout_below="@+id/button5" android:scaleType="center"/>
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignEnd="@+id/button3"
android:layout_alignParentStart="true" android:layout_below="@+id/button3"
android:onClick="sendImageLoaderClick" android:text="使用ImageLoader加载图片"/>
<Button
android:id="@+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="@+id/button4" android:text="networkImageView加载图片"
android:onClick="netWorkImageViewClick"
android:layout_alignEnd="@+id/button4"/>

<com.android.volley.toolbox.NetworkImageView android:layout_width="200dp"
android:layout_height="200dp"
android:id="@+id/networkImageView"
android:layout_below="@+id/imageView"
android:layout_gravity="center_horizontal"/>
</RelativeLayout>