1.volley的get和post请求数据方式的使用
StringRequest（对返回数据类型不确定的情况下）包含后两种
JsonObjectRequest
JsonArrayRequest
回调使用，，成功，失败
Get方式获取数据
StringRequest request = new StringRequest(Method.GET, url, new Listener<String>() {
public void onResponse(String response) { //数据请求成功返回到这个里面
//对response解析即可 }
}, new Response.ErrorListener() {
public void onErrorResponse(VolleyError error) { //数据 请求失败返回到这个里面
}
});
request.setTag("successGet"); MyApplication.getHttpQueues().add(request);Post请求获取数据
StringRequest
StringRequest request = new StringRequest(Method.POST, url, new Listener<String>() {
@Override
public void onResponse(String response) { //数据请求成功返回到这个里面
// TODO Auto-generated method stub
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) { //数据 请求失败返回到这个里面
// TODO Auto-generated method stub
}
}){
protected Map<String, String> getParams() throws AuthFailureError {//post和get不一样的地方
// TODO Auto-generated method stub
Map<String,String> hashMap = new HashMap<String,String>();
hashMap.put("phone", "15671654057");
hashMap.put("key", "**");
return hashMap;
}};
request.setTag("successPost");
MyApplication.getHttpQueues().add(request);
HashMap<String,String>map = new HashMap<String,String>();
map.put("phone", "15671654057");
map.put("key", "**"); //这里的key我是用的聚合
JSONObject object = new JSONObject(map);
JsonObjectRequest objectRequest = new JsonObjectRequest(Method.POST, url, object , new Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
// TODO Auto-generated method stub
}}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
}
});
objectRequest.setTag("successPost");
MyApplication.getHttpQueues().add(objectRequest);
2.volley的网络请求队列建立和取消队列请求
建立全局请求队列
public class MyApplication extends Application {
public static RequestQueue queues;
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
queues = Volley.newRequestQueue(getApplicationContext());
}
public static RequestQueue getHttpQueues() //获取请求队列
{
return queues;
}
}3.volley与activity生命周期的联动
activity销毁，同时关闭请求
设置tag标签，onStop()丽执行取消请求
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
MyApplication.getHttpQueues().cancelAll("successGet"); //与Activity生命周期绑定
}4.volley的简单的二次回调封装
使用自己定义的，使用一个全局可控的
public abstract class VolleyInterface {
public Context context;
public static Listener<String> mListener;
public static ErrorListener mErrorListener;
public VolleyInterface(Context context , Listener<String> listener,
ErrorListener errorListener) {
// TODO Auto-generated constructor stub
this.context = context;
this.mListener = listener;
this.mErrorListener = errorListener;
}
public abstract void onMySuccess(String result);
public abstract void onMyError(VolleyError error);
public Listener<String> loadingListener()
{
mListener = new Listener<String>() {
@Override
public void onResponse(String response) {
// TODO Auto-generated method stub
onMySuccess(response);
}
};
return mListener;
}
public ErrorListener errorListener()
{
mErrorListener = new ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
onMyError(error);
}
};
return mErrorListener;
}
} public class VolleyRequest {
public static StringRequest stringRequest;
public static Context context;
public static void RequestGet(Context mContext,String url,String tag,
VolleyInterface vif) //vif,请求回调接口
{
MyApplication.getHttpQueues().cancelAll(tag);//防止进行重复请求
stringRequest = new StringRequest(Method.GET, url, vif.loadingListener() , vif.errorListener() );
stringRequest.setTag(tag);
MyApplication.getHttpQueues().add(stringRequest);
MyApplication.getHttpQueues().start();
}
public static void RequestPost(Context context , String url ,String tag ,final Map<String,String> params,VolleyInterface vif)
{
MyApplication.getHttpQueues().cancelAll(tag);
stringRequest = new StringRequest(url, vif.loadingListener(), vif.errorListener())
{
@Override
protected Map<String, String> getParams() throws AuthFailureError {
// TODO Auto-generated method stub
return params;
}
};
}
}VolleyRequest.RequestGet(this, url, "successGet", new VolleyInterface(this,VolleyInterface.mListener,VolleyInterface.mErrorListener) {
@Override
public void onMySuccess(String result) {
// TODO Auto-generated method stub
}
@Override
public void onMyError(VolleyError error) {
// TODO Auto-generated method stub
}
});LruCache
ImageLoader
NetworkImageView
最简单的
ImageRequest request = new ImageRequest(url, new Listener<Bitmap>() {
@Override
public void onResponse(Bitmap response) {
// TODO Auto-generated method stub
iv_img.setImageBitmap(response);
}
}, 0, 0,//图片大小，00为默认的 Config.RGB_565//图片格式, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
}
});
MyApplication.getHttpQueues().add(request);
public class BitmapCache implements ImageCache {
public LruCache<String,Bitmap> cache;
public int max = 10*1024*1024; //最大缓冲内存大小，超过启动自动回收
public BitmapCache()
{
cache = new LruCache<String,Bitmap>(max)
{
protected int sizeOf(String key, Bitmap value) {
return value.getRowBytes()*value.getHeight();//
}
};
}
@Override
public Bitmap getBitmap(String url) {
// TODO Auto-generated method stub
return cache.get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
// TODO Auto-generated method stub
cache.put(url, bitmap);
}
}主activity中
ImageLoader loader = new ImageLoader(MyApplication.getHttpQueues(), new BitmapCache());
ImageListener listener = ImageLoader.getImageListener(iv_img, R.drawable.ic_launcher, R.drawable.ic_launcher);//有一个图片是加载错误时显示 loader.get(url, listener);</pre><pre name="code" class="html"><com.android.volley.toolbox.NetworkImageView
android:id="@+id/imag"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_marginLeft="63dp"
android:layout_toRightOf="@+id/textView1"
></com.android.volley.toolbox.NetworkImageView>主activity中
netImageView = (NetworkImageView) findViewById(R.id.imag);
ImageLoader loader = new ImageLoader(MyApplication.getHttpQueues(), new BitmapCache());
netImageView.setDefaultImageResId(R.drawable.ic_launcher);//默认显示
netImageView.setErrorImageResId(R.drawable.ic_launcher); //加载错误显示
netImageView.setImageUrl(url, loader); //加载网络图片