編輯:關於Android編程
AsyncHttpClient client = new AsyncHttpClient(); client.get("http://www.baidu.com", new AsyncHttpResponseHandler() { @Override public void onSuccess(String response) { System.out.println(response); textView.setText(response); } @Override public void onStart() { super.onStart(); System.out.println("onStart"); } @Override public void onFinish() { super.onFinish(); System.out.println("onFinish"); } }通過Get請求指定的URL並通過回調函數處理請求結果,同時,請求方式還支持POST和PUT,請求的同時還支持參數傳遞,下面看看如何通過JSON字符串作為參數訪問服務器:
try { JSONObject jsonObject = new JSONObject(); jsonObject.put("username", "ryantang"); StringEntity stringEntity = new StringEntity(jsonObject.toString()); client.post(MainActivity.this, "http://api.com/login", stringEntity, "application/json", new JsonHttpResponseHandler(){ @Override public void onSuccess(JSONObject jsonObject) { super.onSuccess(jsonObject); } }); } catch (JSONException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); }
public class HttpUtil { private static AsyncHttpClient client = new AsyncHttpClient(); // 實例話對象 static { client.setTimeout(10000); // 設置鏈接超時,如果不設置,默認為10s } // 用一個完整url獲取一個string對象 public static void get(String urlString, AsyncHttpResponseHandler res) { client.get(urlString, res); } // url裡面帶參數 public static void get(String urlString, RequestParams params, AsyncHttpResponseHandler res){ client.get(urlString, params, res); } // 不帶參數,獲取json對象或者數組 public static void get(String urlString, JsonHttpResponseHandler res) { client.get(urlString, res); } // 帶參數,獲取json對象或者數組 public static void get(String urlString, RequestParams params, JsonHttpResponseHandler res) { client.get(urlString, params, res); } // 下載數據使用,會返回byte數據 public static void get(String uString, BinaryHttpResponseHandler bHandler) { client.get(uString, bHandler); } public static AsyncHttpClient getClient(){ return client; } }
public void downloadClick(View view) { String url = "http://f.hiphotos.baidu.com/album/w%3D2048/sign=38c43ff7902397ddd6799f046dbab3b7/9c16fdfaaf51f3dee973bf7495eef01f3b2979d8.jpg"; HttpUtil.get(url, new BinaryHttpResponseHandler() { @Override public void onSuccess(byte[] arg0) { super.onSuccess(arg0); File file = Environment.getExternalStorageDirectory(); File file2 = new File(file, "cat"); file2.mkdir(); file2 = new File(file2, "cat.jpg"); try { FileOutputStream oStream = new FileOutputStream(file2); oStream.write(arg0); oStream.flush(); oStream.close(); textView.setText("可愛的貓咪已經保存在sdcard裡面"); } catch (Exception e) { e.printStackTrace(); Log.i("hck", e.toString()); } } }); }上傳:
public void uploadClick(View view){ String path="http://10.0.2.2:8080/jsontest/servlet/UploadServlet"; File myFile = new File("/sdcard/cat/cat.jpg"); RequestParams params = new RequestParams(); try { params.put("filename", myFile); AsyncHttpClient client = new AsyncHttpClient(); client.post(path, params, new AsyncHttpResponseHandler(){ @Override public void onSuccess(int statusCode, String content) { // TODO Auto-generated method stub super.onSuccess(statusCode, content); Toast.makeText(MainActivity.this, "上傳成功!", Toast.LENGTH_LONG).show(); } }); } catch(FileNotFoundException e) { } }
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看了很多大神們的文章,感覺受益良多,也非常欣賞大家的分享態度,所以決定開始寫Blog,給大家分享自己的心得。先看看效果圖:本來准備在ListView的每個Item的布局上