AsyncHttpClient 获取图片和网页数据演示

AsyncHttpClient 极其好用，，采用回调的方式并且是异步的，UI线程已经封装好。https://github.com/loopj/android-async-http

这个例子较为简单。

先看运行结果

点击按钮 从网络上获取图片和baidu首页显示出来.

项目是直接用的源码，为了研究源码使用的。

public class HTTPHelper {public HTTPHelper() {}public void get(String url,ResponseHandlerInterface callback){AsyncHttpClient client = new AsyncHttpClient();client.get(url,callback);}}

public class MyActivity extends Activity {final static String TAG = MyActivity.class.getCanonicalName();private final static String URL = "";private final static String IMAGE_URL = "";//图片资源private WebView webView;private ImageView imageView;private HTTPHelper helper;public MyActivity() {}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {webView = (WebView) findViewById(R.id.webview);imageView = (ImageView) findViewById(R.id.img);helper = new HTTPHelper();findViewById(R.id.btn_http_get).setOnClickListener(new OnClickListener() {public void onClick(View view) {helper.get(URL, textCallback);//获取文本}});findViewById(R.id.btn_http_get_img).setOnClickListener(new OnClickListener() {public void onClick(View view) {helper.get(IMAGE_URL, binaryCallback);//获取图片}});}// 获取图片流BinaryHttpResponseHandler binaryCallback = new BinaryHttpResponseHandler() {@Overridepublic void onSuccess(int statusCode, Header[] headers,byte[] binaryData) {Log.d(TAG, "onSuccess:" + statusCode + " binaryData:"+ binaryData.length);MyActivity.this.updateImage(binaryData);}@Overridepublic void onFailure(int statusCode, Header[] headers,byte[] binaryData, Throwable error) {Log.e(TAG, "onFailure:" + error + " statusCode:" + statusCode);}};// 获取文本流TextHttpResponseHandler textCallback = new TextHttpResponseHandler() {@Overridepublic void onFailure(int statusCode, Header[] headers,String responseString, Throwable throwable) {Log.e(TAG, "onFailure:" + throwable + " statusCode:" + statusCode);}@Overridepublic void onSuccess(int statusCode, Header[] headers,String responseString) {Log.d(TAG, "onSuccess:" + statusCode + " responseString:"+ responseString.length());MyActivity.this.updateWebView(responseString);}};public void updateImage(byte[] data) {Bitmap b = BitmapFactory.decodeByteArray(data, 0, data.length);imageView.setImageBitmap(b);}public void updateWebView(String data) {webView.getSettings().setJavaScriptEnabled(true);webView.getSettings().setDefaultTextEncodingName("UTF -8");webView.loadData(data, "text/html; charset=UTF-8", null);}}

BinaryHttpResponseHandler 是Binary的请求回调，用在获取图片比较合适

TextHttpResponseHandler 是字符串文本类的请求回调，它的子类还有json获取的回调接口

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android=""android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><Buttonandroid:id="@+id/btn_http_get"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="http get text" /><Buttonandroid:id="@+id/btn_http_get_img"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="http get image" /><WebViewandroid:layout_marginTop="5dp"android:layout_width="fill_parent"android:layout_height="240dp"android:id="@+id/webview"/><ImageViewandroid:id="@+id/img"android:layout_marginTop="5dp"android:layout_width="200dp"android:layout_height="150dp"android:scaleType="fitCenter" /></LinearLayout>

That’s all right~

但没有一个创造奇迹的人是依靠瞬间的。