Android Volley框架使用方法详解

// 1 创建一个请求队列
RequestQueue requestQueue = Volley.newRequestQueue(VolleyActivity.this);
 
// 2 创建一个请求
String url = "http://api.m.mtime.cn/PageSubArea/TrailerList.api";
 
StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() {
  // 正确接收数据回调
  @Override
  public void onResponse(String s) {
    tv_volley_result.setText(s);
  }
}, new Response.ErrorListener() {// 发生异常后的监听回调
  @Override
  public void onErrorResponse(VolleyError volleyError) {
    tv_volley_result.setText("加载失败" + volleyError);
  }
});
 
// 3 将创建的请求添加到请求队列中
requestQueue.add(stringRequest);

// 1 创建一个请求队列
RequestQueue requestQueue = Volley.newRequestQueue(VolleyActivity.this);
 
// 2 创建一个post请求
String url = "http://api.m.mtime.cn/PageSubArea/TrailerList.api";
StringRequest stringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
  @Override
  public void onResponse(String s) {
    tv_volley_result.setText(s);
  }
}, new Response.ErrorListener() {
  @Override
  public void onErrorResponse(VolleyError volleyError) {
    tv_volley_result.setText("请求失败" + volleyError);
  }
}) {
  @Override
  protected Map<String, String> getParams() throws AuthFailureError {
 
    Map<String, String> map = new HashMap<String, String>();
//            map.put("value1","param1");
 
    return map;
  }
};
 
// 3 将post请求添加到队列中
requestQueue.add(stringRequest);

// 1 创建一个请求队列
RequestQueue requestQueue = Volley.newRequestQueue(VolleyActivity.this);
 
// 2 创建一个请求
String url = "http://api.m.mtime.cn/PageSubArea/TrailerList.api";
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(url, null, new Response.Listener<JSONObject>() {
  @Override
  public void onResponse(JSONObject jsonObject) {
    tv_volley_result.setText(jsonObject.toString());
  }
}, new Response.ErrorListener() {
  @Override
  public void onErrorResponse(VolleyError volleyError) {
    tv_volley_result.setText("请求失败" + volleyError);
  }
});
 
// 3 将创建的请求添加到请求队列中
requestQueue.add(jsonObjectRequest);　　 

// 1 创建一个请求队列
RequestQueue requestQueue = Volley.newRequestQueue(VolleyActivity.this);
 
// 2 创建一个图片的请求
String url = "http://img5.mtime.cn/mg/2016/10/11/160347.30270341.jpg";
ImageRequest imageRequest = new ImageRequest(url, new Response.Listener<Bitmap>() {
  @Override
  public void onResponse(Bitmap bitmap) {
    // 正确接收到图片
    iv_volley_result.setImageBitmap(bitmap);
  }
}, 0, 0, Bitmap.Config.RGB_565, new Response.ErrorListener() {
  @Override
  public void onErrorResponse(VolleyError volleyError) {
    iv_volley_result.setImageResource(R.drawable.atguigu_logo);
  }
});
 
// 3 将请求添加到请求队列中
requestQueue.add(imageRequest);　

// 创建一个请求队列
RequestQueue requestQueue = Volley.newRequestQueue(VolleyActivity.this);
 
ImageLoader imageLoader = new ImageLoader(requestQueue, new BitmapCache());
 
// 加载图片
String url = "http://img5.mtime.cn/mg/2016/10/11/160347.30270341.jpg";
ImageLoader.ImageListener imageListener = imageLoader.getImageListener(iv_volley_result, R.drawable.atguigu_logo, R.drawable.atguigu_logo);
imageLoader.get(url, imageListener);　　

public class BitmapCache implements ImageLoader.ImageCache {
  private LruCache<String, Bitmap> mCache;

  public BitmapCache() {
    int maxSize = 10 * 1024 * 1024;// 10m
    mCache = new LruCache<String, Bitmap>(maxSize) {
      @Override
      protected int sizeOf(String key, Bitmap bitmap) {
        return bitmap.getRowBytes() * bitmap.getHeight();
      }
    };
  }

  @Override
  public Bitmap getBitmap(String url) {
    return mCache.get(url);
  }

  @Override
  public void putBitmap(String url, Bitmap bitmap) {
    mCache.put(url, bitmap);
  }
}

<com.android.volley.toolbox.NetworkImageView
  android:id="@+id/iv_volley_networkimagview"
  android:layout_width="200dp"
  android:layout_height="200dp"
  android:visibility="gone">
 
</com.android.volley.toolbox.NetworkImageView>
 

// 创建一个请求队列
RequestQueue requestQueue = Volley.newRequestQueue(VolleyActivity.this);
 
// 创建一个Imageloader
ImageLoader imageLoader = new ImageLoader(requestQueue, new BitmapCache());
 
// 默认图片和异常图片设置
iv_volley_networkimagview.setDefaultImageResId(R.drawable.atguigu_logo);
iv_volley_networkimagview.setErrorImageResId(R.drawable.atguigu_logo);
 
// 加载图片
String url = "http://img5.mtime.cn/mg/2016/10/11/160347.30270341.jpg";
iv_volley_networkimagview.setImageUrl(url, imageLoader);