編輯:關於android開發
在前幾篇文章中《Android 采用get方式提交數據到服務器》《Android 采用post方式提交數據到服務器》《Android 采用HttpClient提交數據到服務器》介紹了android的兩種提交數據到服務器的方法
本文將介紹另外一種基於框架android-async-http的方法來實現
android-async-http是一個強大的網絡請求庫,這個網絡請求庫是基於Apache HttpClient庫之上的一個異步網絡請求處理庫,網絡處理均基於Android的非UI線程,通過回調方法處理請求結果。android-async-http是一個強大的第三方開源網絡請求庫
官網源碼:https://github.com/loopj/android-async-http
官網教程:http://loopj.com/android-async-http/
新建項目,先到github上:https://github.com/loopj/android-async-http/tree/1.4.0
下載相應的zip文件,解壓縮後將src中的com文件夾復制到項目的src目錄
下面使用框架android-async-http,代碼如下:
package com.wuyudong.asynchttp; import java.net.URLEncoder; import com.loopj.android.http.AsyncHttpClient; import com.loopj.android.http.AsyncHttpResponseHandler; import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.Toast; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void click(View view) { // 用戶名密碼提交到服務器 AsyncHttpClient client = new AsyncHttpClient(); String path = "http://169.254.168.71:8080/web/LoginServlet?username=" + URLEncoder.encode("wuyudong") + "&password=" + URLEncoder.encode("123"); client.get(path, new AsyncHttpResponseHandler() { @Override public void onSuccess(String content) { // TODO Auto-generated method stub super.onSuccess(content); Toast.makeText(MainActivity.this, "請求成功!", 0).show(); } @Override public void onFailure(Throwable error, String content) { // TODO Auto-generated method stub super.onFailure(error, content); Toast.makeText(MainActivity.this, "請求失敗!", 0).show(); } }); } }
可以看到代碼量減少了很多
下面來實現一個精簡版的異步框架
新建項目
AsyncHttpClient.java
package com.wuyudong.AsyncClient; import java.io.IOException; import java.io.InputStream; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import android.os.Message; public class AsyncHttpClient { public void get(final String path, final MyHandler myHandler) { new Thread() { @Override public void run() { HttpClient client = new DefaultHttpClient(); HttpGet httpGet = new HttpGet(path); try { HttpResponse response = client.execute(httpGet); InputStream is = response.getEntity().getContent(); String content = StreamTools.readInputStream(is); // 執行成功 Message msg = new Message(); msg.what = 0; msg.obj = "請求成功"; myHandler.sendMessage(msg); } catch (Exception e) { e.printStackTrace(); // 執行失敗 Message msg = new Message(); msg.what = 1; msg.obj = "請求失敗"; myHandler.sendMessage(msg); } } }.start(); } }
MainActivity.java
package com.wuyudong.AsyncClient; import java.net.URLEncoder; import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.Toast; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void click(View view) { // 1、開啟子線程 執行一個http請求,在後台執行 在子線程執行 // 2、 子線程執行完畢後通知ui界面 AsyncHttpClient client = new AsyncHttpClient(); String path = "http://169.254.168.71:8080/web/LoginServlet?username=" + URLEncoder.encode("wuyudong") + "&password=" + URLEncoder.encode("123"); client.get(path, new MyHandler() { @Override public void onFailure(String content) { Toast.makeText(MainActivity.this, content, 1).show(); super.onFailure(content); } @Override public void onSuccess(String content) { Toast.makeText(MainActivity.this, content, 0).show(); super.onSuccess(content); } }); } }
MyHandler.java
package com.wuyudong.AsyncClient; import android.os.Handler; import android.os.Message; public class MyHandler extends Handler { public void onFailure(String content) { } public void onSuccess(String content) { } @Override public void handleMessage(Message msg) { String content = (String) msg.obj; switch (msg.what) { case 0: onSuccess(content); break; case 1: onFailure(content); break; default: break; } super.handleMessage(msg); } }
StreamTools.java
package com.wuyudong.AsyncClient; import java.io.ByteArrayOutputStream; import java.io.InputStream; public class StreamTools { /** * 把輸入流的內容轉化成字符串 * * @param is * @return */ public static String readInputStream(InputStream is) { try { ByteArrayOutputStream baos = new ByteArrayOutputStream(); int len = 0; byte[] buffer = new byte[1024]; while ((len = is.read(buffer)) != -1) { baos.write(buffer, 0, len); } is.close(); baos.close(); byte[] result = baos.toByteArray(); String str = new String(result); // 試著解析result裡面的字符串 if (str.contains("gb2312")) { return new String(result, "gb2312"); } else if(str.contains("utf-8")){ return str; } else { return null; } //return new String(result, "gb2312"); } catch (Exception e) { e.printStackTrace(); return null; } } }
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