标签:
volley是谷歌官方在2013年推出的Android平台上的网络通信库
特点
异步处理请求。排序处理。缓存。缺点
不适合数据的上传与下载
Get和Post请求接口的使用
请求对象
StringRequest request = new StringRequest(Request.Method.GET, REQUEST_URL, new Response.Listener<String>() {@Overridepublic void onResponse(String s) {//数据请求成功result.setText("请求成功:" + s);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError volleyError) {//数据请求失败result.setText("请求失败:" + volleyError.getMessage());}});
JSONObject jsonRequest = new JSONObject();//Get请求传递参数jsonRequest可以为空nullJsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, REQUEST_URL, null, new Response.Listener<JSONObject>() {@Overridepublic void onResponse(JSONObject jsonObject) {result.setText("请求成功:" + jsonObject);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError volleyError) {result.setText("请求失败:" + volleyError.getMessage());}});
JsonArrayRequest request = new JsonArrayRequest(REQUEST_URL, new Response.Listener<JSONArray>() {@Overridepublic void onResponse(JSONArray jsonArray) {result.setText("请求成功:" + jsonArray);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError volleyError) {result.setText("请求失败:" + volleyError.getMessage());}});
网络请求队列建立和取消队列建立
//创建请求队列private static RequestQueue queues;//初始化请求队列queues = Volley.newRequestQueue(getApplicationContext());
MyApplication.getQueues().add(request);
MyApplication.getQueues().cancelAll(tag);
与Activity生命周期的联动
@Overrideprotected void onStop() {super.onStop();//结束请求MyApplication.getQueues().cancelAll("StringRequest_get");}
demo效果如下
<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/activity_main"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context="com.xhb.app.MainActivity"><ScrollViewandroid:layout_width="match_parent"android:layout_height="match_parent"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"><Buttonandroid:id="@+id/_StringRequestGet"android:layout_width="wrap_content"android:layout_height="wrap_content"android:onClick="StringRequestGet"android:text="StringRequestGet"android:textAllCaps="false"/><Buttonandroid:id="@+id/StringRequestPost"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="20dp"android:layout_toRightOf="@id/_StringRequestGet"android:onClick="StringRequestPost"android:text="StringRequestPost"android:textAllCaps="false"/></RelativeLayout><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"><Buttonandroid:id="@+id/JsonObjectRequestGet"android:layout_width="wrap_content"android:layout_height="wrap_content"android:onClick="JsonObjectRequestGet"android:text="JsonObjectRequestGet"android:textAllCaps="false"/><Buttonandroid:id="@+id/JsonObjectRequestPost"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="20dp"android:layout_toRightOf="@id/JsonObjectRequestGet"android:onClick="JsonObjectRequestPost"android:text="JsonObjectRequestPost"android:textAllCaps="false"/></RelativeLayout><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"><Buttonandroid:id="@+id/JsonArrayRequest"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentLeft="true"android:layout_alignParentStart="true"android:layout_alignParentTop="true"android:onClick="JsonArrayRequest"android:text="JsonArrayRequest"android:textAllCaps="false"/></RelativeLayout><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"><Buttonandroid:id="@+id/MyRequestGet"android:layout_width="wrap_content"android:layout_height="wrap_content"android:onClick="MyRequestGet"android:text="MyRequestGet"android:textAllCaps="false"/><Buttonandroid:id="@+id/MyRequestPost"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="20dp"android:layout_toRightOf="@id/MyRequestGet"android:onClick="MyRequestPost"android:text="MyRequestPost"android:textAllCaps="false"/></RelativeLayout><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"><Buttonandroid:id="@+id/ImageRequest"android:layout_width="wrap_content"android:layout_height="wrap_content"android:onClick="ImageRequest"android:text="ImageRequest"android:textAllCaps="false"/><Buttonandroid:id="@+id/ImageLoader"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="20dp"android:layout_toRightOf="@id/ImageRequest"android:onClick="ImageLoader"android:text="ImageLoader"android:textAllCaps="false"/></RelativeLayout><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"><ImageViewandroid:id="@+id/image_imageRequest"android:layout_width="100dp"android:layout_height="100dp"android:src="@mipmap/ic_launcher"android:textAllCaps="false"/><ImageViewandroid:id="@+id/image_iamgeLoader"android:layout_width="100dp"android:layout_height="100dp"android:layout_marginLeft="20dp"android:layout_toRightOf="@id/image_imageRequest"android:src="@mipmap/ic_launcher"android:textAllCaps="false"/></RelativeLayout><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="20dp"android:text="请求结果为:"/><TextViewandroid:id="@+id/result"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"/></LinearLayout></ScrollView></LinearLayout>
public class MyApplication extends Application {//创建请求队列private static RequestQueue queues;@Overridepublic void onCreate() {super.onCreate();//初始书请求队列queues = Volley.newRequestQueue(getApplicationContext());}public static RequestQueue getQueues() {return queues;}}
public class MainActivity extends AppCompatActivity {public static final String BASE = "http://op.juhe.cn/onebox/weather/query";public static final String REQUEST_URL = BASE + "?cityname=%E5%8D%81%E5%A0%B0&key=634f562a2b3900e051c6af6e2dc3017e";public static final String IMAGE_URL = "https://pic.cnblogs.com/avatar/789527/20160825180355.png";private TextView result;private ImageView image_imageRequest, image_iamgeLoader;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);result = (TextView) findViewById(R.id.result);image_imageRequest = (ImageView) findViewById(R.id.image_imageRequest);image_iamgeLoader = (ImageView) findViewById(R.id.image_iamgeLoader);}public void StringRequestGet(View view) {//StringRequestStringRequest request = new StringRequest(Request.Method.GET, REQUEST_URL, new Response.Listener<String>() {@Overridepublic void onResponse(String s) {//数据请求成功result.setText("请求成功:" + s);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError volleyError) {//数据请求失败result.setText("请求失败:" + volleyError.getMessage());}});request.setTag("StringRequest_get");MyApplication.getQueues().add(request);}public void StringRequestPost(View view) {//StringRequestStringRequest request = new StringRequest(Request.Method.POST, BASE, new Response.Listener<String>() {@Overridepublic void onResponse(String s) {//数据请求成功result.setText("请求成功:" + s);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError volleyError) {//数据请求失败result.setText("请求失败:" + volleyError.getMessage());}}) {@Override//传递参数protected Map<String, String> getParams() throws AuthFailureError {Map<String, String> map = new HashMap<>();map.put("key", "634f562a2b3900e051c6af6e2dc3017e");map.put("cityname", "十堰");return map;}};request.setTag("StringRequestPost");MyApplication.getQueues().add(request);}public void JsonObjectRequestGet(View view) {//JsonObjectRequestJSONObject jsonRequest = new JSONObject();//Get请求传递参数jsonRequest可以为空nullJsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, REQUEST_URL, null, new Response.Listener<JSONObject>() {@Overridepublic void onResponse(JSONObject jsonObject) {result.setText("请求成功:" + jsonObject);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError volleyError) {result.setText("请求失败:" + volleyError.getMessage());}});request.setTag("JsonObjectRequestGet");MyApplication.getQueues().add(request);}public void JsonObjectRequestPost(View view) {Map<String, String> map = new HashMap<>();map.put("key", "634f562a2b3900e051c6af6e2dc3017e");map.put("cityname", "十堰");JSONObject jsonRequest = new JSONObject(map);JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, BASE, jsonRequest, new Response.Listener<JSONObject>() {@Overridepublic void onResponse(JSONObject jsonObject) {result.setText("请求成功:" + jsonObject.toString());}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError volleyError) {result.setText("请求失败:" + volleyError.getMessage());}});request.setTag("JsonObjectRequestPost");MyApplication.getQueues().add(request);}public void JsonArrayRequest(View view) {JsonArrayRequest request = new JsonArrayRequest(REQUEST_URL, new Response.Listener<JSONArray>() {@Overridepublic void onResponse(JSONArray jsonArray) {result.setText("请求成功:" + jsonArray);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError volleyError) {result.setText("请求失败:" + volleyError.getMessage());}});request.setTag("JsonArrayRequest");MyApplication.getQueues().add(request);}public void MyRequestGet(View view) {new VolleyRequest().RequestGet(this, REQUEST_URL, "MyRequestGet", new ResultBack(this, ResultBack.listener, ResultBack.errorListener) {@Overridepublic void onSuccess(String s) {result.setText("请求成功:" + s);}@Overridepublic void onFailure(VolleyError volleyError) {result.setText("请求失败:" + volleyError.getMessage());}});}public void MyRequestPost(View view) {Map<String, String> map = new HashMap<>();map.put("key", "634f562a2b3900e051c6af6e2dc3017e");map.put("cityname", "十堰");new VolleyRequest().RequestPost(this, REQUEST_URL, "MyRequestPost", map, new ResultBack(this, ResultBack.listener, ResultBack.errorListener) {@Overridepublic void onSuccess(String s) {result.setText("请求成功:" + s);}@Overridepublic void onFailure(VolleyError volleyError) {result.setText("请求失败:" + volleyError.getMessage());}});}//ImageRequest方式加载图片public void ImageRequest(View view) {ImageRequest request = new ImageRequest(IMAGE_URL, new Response.Listener<Bitmap>() {@Overridepublic void onResponse(Bitmap bitmap) {//加载成功image_imageRequest.setImageBitmap(bitmap);}}, 0, 0, Bitmap.Config.RGB_565, new Response.ErrorListener() {//加载失败@Overridepublic void onErrorResponse(VolleyError volleyError) {image_imageRequest.setImageResource(R.mipmap.ic_launcher);}});request.setTag("ImageRequest");MyApplication.getQueues().add(request);}//ImageLoader加载图片public void ImageLoader(View view) {ImageLoader imageLoader = new ImageLoader(MyApplication.getQueues(), new BitmapCache());ImageLoader.ImageListener listener = imageLoader.getImageListener(image_iamgeLoader, R.mipmap.ic_launcher, R.mipmap.ic_launcher);imageLoader.get(IMAGE_URL, listener);}@Overrideprotected void onStop() {super.onStop();//结束请求MyApplication.getQueues().cancelAll("StringRequest_get");}}
public class VolleyRequest {public static StringRequest stringRequest;public static void RequestGet(Context context,String url,String tag,ResultBack reback){MyApplication.getQueues().cancelAll(tag);stringRequest=new StringRequest(Request.Method.GET, url,reback.loadingListener(),reback.errorListener());stringRequest.setTag(tag);MyApplication.getQueues().add(stringRequest);MyApplication.getQueues().start();}public static void RequestPost(Context context, String url,String tag,final Map<String,String> map,ResultBack reback){MyApplication.getQueues().cancelAll(tag);stringRequest=new StringRequest(Request.Method.GET, url, reback.loadingListener(),reback.errorListener()){@Overrideprotected Map<String, String> getParams() throws AuthFailureError {return map;}};stringRequest.setTag(tag);MyApplication.getQueues().add(stringRequest);MyApplication.getQueues().start();}}
自定义的回调接口
public abstract class ResultBack {public Context context;public static Response.Listener<String> listener;public static Response.ErrorListener errorListener;public ResultBack(Context context, Response.Listener<String> listener, Response.ErrorListener errorListener) {this.context = context;this.listener = listener;this.errorListener = errorListener;}public Response.Listener<String> loadingListener() {listener = new Response.Listener<String>() {@Overridepublic void onResponse(String s) {onSuccess(s);}};return listener;}public Response.ErrorListener errorListener() {errorListener = new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError volleyError) {onFailure(volleyError);}};return errorListener;}public abstract void onSuccess(String s);public abstract void onFailure(VolleyError volleyError);}
public class BitmapCache implements ImageLoader.ImageCache {public LruCache<String,Bitmap> mBitmapLruCache;public int max=1024*1024*10;// 最大缓存10M,超过就会回收public BitmapCache(){mBitmapLruCache=new LruCache<String,Bitmap>(max){@Overrideprotected int sizeOf(String key, Bitmap value) {return value.getRowBytes()*value.getHeight();}};}@Overridepublic Bitmap getBitmap(String s) {return mBitmapLruCache.get(s);}@Overridepublic void putBitmap(String s, Bitmap bitmap) {mBitmapLruCache.put(s,bitmap);}}
标签:
原文地址:http://www.cnblogs.com/wisemen/p/5835918.html