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   源码介绍

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public class MainActivity extends Activity {
	private RequestQueue mRequestQueue;
	private StringRequest mStringRequest;
	private Context mContext;
	private JsonObjectRequest mJsonObjectRequest;
	 private ImageView mImageView;
	 private NetworkImageView mNetworkImageView;  
	 private ListView listView;
	 private ListAdapters listadat;
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		// volley_get();
		// volley_post();
		// 1 创建RequestQueue对象
		mRequestQueue = Volley.newRequestQueue(this);
		volley_json();
		listView=(ListView)findViewById(R.id.list);
		listadat=new ListAdapters(this,mRequestQueue);
		listView.setAdapter(listadat);
		init();
	}

	// 利用Volley实现Get请求
	private void volley_get() {
		mContext = this;
		String url = "http://www.baidu.com/";
		// 1 创建RequestQueue对象
		mRequestQueue = Volley.newRequestQueue(mContext);
		// 2 创建StringRequest对象
		mStringRequest = new StringRequest(url,
				new Response.Listener<String>() {
					@Override
					public void onResponse(String response) {
						System.out.println("请求结果:"   response);
					}
				}, new Response.ErrorListener() {
					@Override
					public void onErrorResponse(VolleyError error) {
						System.out.println("请求错误:"   error.toString());
					}
				});
		// 3 将StringRequest添加到RequestQueue
		mRequestQueue.add(mStringRequest);
	}

	// 利用Volley实现Post请求
	private void volley_post() {
		String url = "http://hxyj.cwwic.cn/wap/api_cs/user.php?action=login";
		mContext = this;
		mRequestQueue = Volley.newRequestQueue(mContext);
		mStringRequest = new StringRequest(Method.POST, url,
				new Response.Listener<String>() {
					@Override
					public void onResponse(String response) {
						System.out.println("请求结果:"   response);
					}
				}, new Response.ErrorListener() {
					@Override
					public void onErrorResponse(VolleyError error) {
						System.out.println("请求错误:"   error.toString());
					}
				}) {
			// 携带参数
			@Override
			protected HashMap<String, String> getParams()
					throws AuthFailureError {
				HashMap<String, String> hashMap = new HashMap<String, String>();
				hashMap.put("un", "411111222");
				hashMap.put("pw", "180034111");
				return hashMap;
			}

		};
		mRequestQueue.add(mStringRequest);

	}

	// 利用Volley实现Json数据请求
	private void volley_json() {
		mContext = this;
		String url = "http://m.weather.com.cn/data/101010100.html";
		// 1 创建RequestQueue对象
	//	mRequestQueue = Volley.newRequestQueue(mContext);
		// 2 创建JsonObjectRequest对象
		mJsonObjectRequest = new JsonObjectRequest(url, null,
				new Response.Listener<JSONObject>() {
					@Override
					public void onResponse(JSONObject response) {
						System.out.println("请求结果:"   response.toString());
						// System.out.println(JSON.parseObject(response.toString(),
						// Value.class).getWeather6());
						try {
							JSONObject jsonObject = new JSONObject(response
									.toString()).getJSONObject("weatherinfo");
							System.out.println("处理结构:"
									  jsonObject.getString("weather6"));
						} catch (JSONException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}

					}
				}, new Response.ErrorListener() {
					@Override
					public void onErrorResponse(VolleyError error) {
						System.out.println("请求错误:"   error.toString());
					}
				});

		// 3 将JsonObjectRequest添加到RequestQueue
		mRequestQueue.add(mJsonObjectRequest);

	}

	/** * 利用NetworkImageView显示网络图片 */
	private void showImageByNetworkImageView() {
		String imageUrl = "http://avatar.csdn.net/6/6/D/1_lfdfhl.jpg";
		RequestQueue requestQueue = Volley.newRequestQueue(this);
		final LruCache<String, Bitmap> lruCache = new LruCache<String, Bitmap>(
				20);
		ImageCache imageCache = new ImageCache() {
			@Override
			public void putBitmap(String key, Bitmap value) {
				lruCache.put(key, value);
			}

			@Override
			public Bitmap getBitmap(String key) {
				return lruCache.get(key);
			}
		};
		ImageLoader imageLoader = new ImageLoader(requestQueue, imageCache);
		mNetworkImageView.setTag("url");
		mNetworkImageView.setImageUrl(imageUrl, imageLoader);
	}

	/**
	 * * 利用Volley异步加载图片 * * 注意方法参数: * getImageListener(ImageView view, int
	 * defaultImageResId, int errorImageResId) * 第一个参数:显示图片的ImageView *
	 * 第二个参数:默认显示的图片资源 * 第三个参数:加载错误时显示的图片资源
	 */
	private void loadImageByVolley() {
		String imageUrl = "http://avatar.csdn.net/6/6/D/1_lfdfhl.jpg";
		RequestQueue requestQueue = Volley.newRequestQueue(this);
		final LruCache<String, Bitmap> lruCache = new LruCache<String, Bitmap>(
				20);
		ImageCache imageCache = new ImageCache() {
			@Override
			public void putBitmap(String key, Bitmap value) {
				lruCache.put(key, value);
			}

			@Override
			public Bitmap getBitmap(String key) {
				return lruCache.get(key);
			}
		};
		ImageLoader imageLoader = new ImageLoader(requestQueue, imageCache);
		ImageListener listener = ImageLoader.getImageListener(mImageView,
				R.drawable.ic_launcher, R.drawable.ic_launcher);
		imageLoader.get(imageUrl, listener);
	}

	private void init() {
		mImageView = (ImageView) findViewById(R.id.imageView);
		mNetworkImageView = (NetworkImageView) findViewById(R.id.networkImageView);
	//	getJSONByVolley();
		loadImageByVolley();
		showImageByNetworkImageView();
	}
}