1. 框架特点
(1). 通信更快，更简单
(2). Get、Post网络请求及网络图像的高效率异步处理请求
(3). 排序
(4). 网络请求的缓存
(5). 多级别取消请求
(6). 和Activity生命周期的联动
缺点：不适合上传和下载
优点：高效的Get/Post方式的数据请求交互，网络图片加载和缓存，是谷歌官方推出的框架，性能很稳定和强劲。
2. 网络数据请求
(1). 使用Get方式请求数据
创建Application类：
<span style="white-space:pre"> </span>public class MyApplication extends Application {
public static RequestQueue queues;
@Override
public void onCreate() {
super.onCreate();
queues = Volley.newRequestQueue(getApplicationContext());
}
public static RequestQueue getHttpQueues() {
return queues;
}
}使用StringRequest测试GET请求：
<span style="white-space:pre"> </span>private void volleyGetStringReuest() {
String url = "http://apis.juhe.cn/mobile/get?phone=13689249616&key=d83212f9ca3a6028fa0d7d77a3ff3bf8";
// 创建请求对象
StringRequest request = new StringRequest(Method.GET, url,
new Listener<String>() {
// 请求成功时调用
@Override
public void onResponse(String arg0) {
Toast.makeText(MainActivity.this, arg0, 0).show();
}
}, new Response.ErrorListener() {
// 请求失败时调用
@Override
public void onErrorResponse(VolleyError arg0) {
Toast.makeText(MainActivity.this, arg0.toString(), 0)
.show();
}
});
request.setTag("abcGet");
MyApplication.getHttpQueues().add(request);
}使用JsonObjectRequest测试GET请求：
private void volleyGetJsonObjectReuest() {
String url = "http://apis.juhe.cn/mobile/get?phone=13689249616&key=d83212f9ca3a6028fa0d7d77a3ff3bf8";
// 创建请求对象
JsonObjectRequest request = new JsonObjectRequest(Method.GET, url,
null, new Listener<JSONObject>() {
// 请求成功
@Override
public void onResponse(JSONObject arg0) {
Toast.makeText(MainActivity.this, arg0.toString(), 0)
.show();
}
}, new Response.ErrorListener() {
// 请求失败
@Override
public void onErrorResponse(VolleyError arg0) {
Toast.makeText(MainActivity.this, arg0.toString(), 0)
.show();
}
});
request.setTag("abcGet");
MyApplication.getHttpQueues().add(request);
}(2). 使用Post请求数据使用StringRequest测试POST请求：
private void volleyStringRequestPost() {
String url = "http://apis.juhe.cn/mobile/get?";
StringRequest request = new StringRequest(Method.POST, url,
new Listener<String>() {
@Override
public void onResponse(String arg0) {
Toast.makeText(MainActivity.this, arg0, 0).show();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError arg0) {
Toast.makeText(MainActivity.this, arg0.toString(), 0)
.show();
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> map = new HashMap<String, String>();
map.put("phone", "13002909620");
map.put("key", "d83212f9ca3a6028fa0d7d77a3ff3bf8");
return map;
}
};
request.setTag("abcGet");
MyApplication.getHttpQueues().add(request);
}
3. Volley与Activity联动
(1). Volley与Activity的联动
覆写onStop方法：
@Override
protected void onStop() {
super.onStop();
MyApplication.getHttpQueues().cancelAll("abcGet");
}(2). Volley的二次回调封装
首先要创建一个抽象类VolleyInterface：
public abstract class VolleyInterface {
public Context mContext;
public Listener<String> mListener;
public ErrorListener mErrorListener;
public abstract void onMySuccess(String result);
public abstract void onMyError(VolleyError error);
public VolleyInterface(Context context, Listener<String> listener,
ErrorListener errorListener) {
mContext = context;
mListener = listener;
mErrorListener = errorListener;
}
public Listener<String> loadingListener() {
mListener = new Listener<String>() {
@Override
public void onResponse(String arg0) {
onMySuccess(arg0);
}
};
return mListener;
}
public ErrorListener errorListener() {
mErrorListener = new ErrorListener() {
@Override
public void onErrorResponse(VolleyError arg0) {
onErrorResponse(arg0);
}
};
return mErrorListener;
}
}
然后创建一个类，自定义我们的GET和POST请求：
public class VolleyRequest {
public static StringRequest stringRequest;
public static Context context;
/**
* 自定义GET
*
* @param context
* @param url
* @param tag
* @param vif
*/
public static void requestGet(Context context, String url, String tag,
VolleyInterface vif) {
MyApplication.getHttpQueues().cancelAll(tag);
stringRequest = new StringRequest(Method.GET, url,
vif.successListener(), vif.errorListener());
stringRequest.setTag(tag);
MyApplication.getHttpQueues().add(stringRequest);
MyApplication.getHttpQueues().start();
}
/**
* 自定义POST
*
* @param context
* @param url
* @param tag
* @param params
* @param vif
*/
public static void requestPost(Context context, String url, String tag,
final Map<String, String> params, VolleyInterface vif) {
MyApplication.getHttpQueues().cancelAll(tag);
stringRequest = new StringRequest(Method.POST, url,
vif.successListener(), vif.errorListener()) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
return params;
}
};
stringRequest.setTag(tag);
MyApplication.getHttpQueues().add(stringRequest);
MyApplication.getHttpQueues().start();
}
}修改测试的代码：
/**
* 自定义get方式
*/
private void myGet() {
String url = "http://apis.juhe.cn/mobile/get?phone=13689249616&key=d83212f9ca3a6028fa0d7d77a3ff3bf8";
VolleyRequest.requestGet(this, url, "abcGet", new VolleyInterface(this,
VolleyInterface.mListener, VolleyInterface.mErrorListener) {
@Override
public void onMySuccess(String result) {
Toast.makeText(MainActivity.this, result, 0).show();
}
@Override
public void onMyError(VolleyError error) {
Toast.makeText(MainActivity.this, error.toString(), 0).show();
}
});
}这样做的好处是：我们可以在VolleyInterface中写好功和失败的两种处理方式，这样在每一个调用者都可以使用。
关于Post我就不做测试了。
4. 获取网络图片
(1). 使用ImageRequest获取网络图片
public class ImageActivity extends Activity {
private ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image);
initView();
String url = "https://www.baidu.com/img/bdlogo.png";
// 宽和高指定0和0就会以原图的方式加载
ImageRequest request = new ImageRequest(url, new Listener<Bitmap>() {
@Override
public void onResponse(Bitmap arg0) {
imageView.setImageBitmap(arg0);
}
}, 0, 0, Config.RGB_565, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError arg0) {
imageView.setImageResource(R.drawable.ic_launcher);
}
});
MyApplication.getHttpQueues().add(request);
}
private void initView() {
imageView = (ImageView) findViewById(R.id.image);
}
}
(2). 使用ImageLoader和ImageListener缓存网路图片
创建BitmapCache类：
public class BitmapCache implements ImageCache {
public LruCache<String, Bitmap> cache;
public int max = 10 * 1024 * 1024;
public BitmapCache() {
cache = new LruCache<String, Bitmap>(max) {
@Override
protected int sizeOf(String key, Bitmap value) {
return value.getRowBytes() * value.getHeight();
}
};
}
@Override
public Bitmap getBitmap(String arg0) {
return cache.get(arg0);
}
@Override
public void putBitmap(String arg0, Bitmap arg1) {
cache.put(arg0, arg1);
}
}调用测试：
private void testImageLoader(String url) {
ImageLoader loader = new ImageLoader(MyApplication.getHttpQueues(),
new BitmapCache());
ImageListener listener = ImageLoader.getImageListener(imageView,
R.drawable.ic_launcher, R.drawable.ic_launcher);
loader.get(url, listener, 0, 0);
}(3). 使用ImageLoader和NetworkImageView加载图片：
private void testNetworkImageView(String url) {
ImageLoader loader = new ImageLoader(MyApplication.getHttpQueues(),
new BitmapCache());
netImageView.setDefaultImageResId(R.drawable.ic_launcher);
netImageView.setErrorImageResId(R.drawable.ic_launcher);
netImageView.setImageUrl(url, loader);
}
版权声明：本文为博主原创文章，未经博主允许不得转载。
原文地址：http://blog.csdn.net/scarthr/article/details/47606435
