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  • async-http

    android-async-http开源框架可以是我们轻松的获取网络数据或者向服务器发送数据，使用起来也很简单，下面做简单介绍，具体详细使用看官网：https://github.com/loopj/android-async-http

    1.新建项目，去官网下载zip包，解压，打开releases文件，把里面最新的jar包，考入项目工程libs目录下，引入包。

    2.通过1，就可以使用了，很简单，下面是自己写的demo，用它提供的各种不同方法完成从服务器获取一个json数据：


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    package com.http;
    import com.loopj.android.http.AsyncHttpClient;
    import com.loopj.android.http.AsyncHttpResponseHandler;
    import com.loopj.android.http.BinaryHttpResponseHandler;
    import com.loopj.android.http.JsonHttpResponseHandler;
    import com.loopj.android.http.RequestParams;
     
    public class HttpUtil {
        private static     AsyncHttpClient client =new AsyncHttpClient();    //实例话对象
        static
        {
            client.setTimeout(11000);   //设置链接超时，如果不设置，默认为10s
        }
        public static void get(String urlString,AsyncHttpResponseHandler res)    //用一个完整url获取一个string对象
        {
            client.get(urlString, res);
        }
        public static void get(String urlString,RequestParams params,AsyncHttpResponseHandler res)   //url里面带参数
        {
            client.get(urlString, params,res);
        }
        public static void get(String urlString,JsonHttpResponseHandler res)   //不带参数，获取json对象或者数组
        {
            client.get(urlString, res);
        }
        public static void get(String urlString,RequestParams params,JsonHttpResponseHandler res)   //带参数，获取json对象或者数组
        {
            client.get(urlString, params,res);
        }
        public static void get(String uString, BinaryHttpResponseHandler bHandler)   //下载数据使用，会返回byte数据
        {
            client.get(uString, bHandler);
        }
        public static AsyncHttpClient getClient()
        {
            return client;
        }
    }



    这个类主要列出了我们常用的get方法，在要使用的地方，调用该类就行了。

    具体使用的类：

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    package com.http;
     
    import java.io.File;
    import java.io.FileOutputStream;
     
    import org.json.JSONArray;
    import org.json.JSONObject;
     
    import android.app.Activity;
    import android.app.ProgressDialog;
    import android.os.Bundle;
    import android.os.Environment;
    import android.util.Log;
    import android.view.View;
    import android.widget.TextView;
    import android.widget.Toast;
     
    import com.loopj.android.http.AsyncHttpResponseHandler;
    import com.loopj.android.http.BinaryHttpResponseHandler;
    import com.loopj.android.http.JsonHttpResponseHandler;
    import com.loopj.android.http.RequestParams;
     
    public class MainActivity extends Activity {
        private TextView textView; // 顶部textview
        private ProgressDialog pDialog;
        private TextView textView2; // 下面textview，显示获取的所有数据
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            textView = (TextView) findViewById(R.id.text);
            textView2 = (TextView) findViewById(R.id.text2);
        }
        public void method1(View view) {
            pDialog = ProgressDialog.show(this, "请稍等", "数据加载中");
            String urlString = "http://client.azrj.cn/json/cook/cook_list.jsp?type=1&p=2&size=10"; // 一個獲取菜谱的url地址
            HttpUtil.get(urlString, new AsyncHttpResponseHandler() {
                public void onSuccess(String arg0) { // 获取数据成功会调用这里
                    pDialog.dismiss();
                    textView.setText("获取json数据成功，看下面");
                    textView2.setText(arg0);
                    Log.i("hck", arg0);
                };
                public void onFailure(Throwable arg0) { // 失败，调用
                    Toast.makeText(MainActivity.this, "onFailure",
                            Toast.LENGTH_LONG).show();
                };
                public void onFinish() { // 完成后调用，失败，成功，都要掉
                };
            });
        }
        public void method2(View view) {
            String urlString = "http://client.azrj.cn/json/cook/cook_list.jsp?";
            RequestParams params = new RequestParams(); // 绑定参数
            params.put("type", "1");
            params.put("p", "2");
            params.put("size", "10");
            HttpUtil.get(urlString, params, new JsonHttpResponseHandler() {
                public void onSuccess(JSONArray arg0) { // 成功后返回一个JSONArray数据
                    Log.i("hck", arg0.length() + "");
                    try {
                        textView.setText("菜谱名字："
                                + arg0.getJSONObject(2).getString("name")); //返回的是JSONArray， 获取JSONArray数据里面的第2个JSONObject对象，然后获取名字为name的数据值
                    } catch (Exception e) {
                        Log.e("hck", e.toString());
                    }
                };
                public void onFailure(Throwable arg0) {
                    Log.e("hck", " onFailure" + arg0.toString());
                };
                public void onFinish() {
                    Log.i("hck", "onFinish");
                };
                public void onSuccess(JSONObject arg0) {   //返回的是JSONObject，会调用这里
                    Log.i("hck", "onSuccess ");
                    try {
                        textView.setText("菜谱名字："
                                + arg0.getJSONArray("list").getJSONObject(0)
                                        .getString("name"));
                    } catch (Exception e) {
                        Log.e("hck", e.toString());
                    }
                };
            });
        }
        public void method3(View view) {
            String urlString = "http://client.azrj.cn/json/cook/cook_list.jsp?type=1&p=2&size=10";
            HttpUtil.get(urlString, new JsonHttpResponseHandler() {
                public void onSuccess(JSONObject arg0) {
                    try {
                        textView.setText("菜谱名字："
                                + arg0.getJSONArray("list").getJSONObject(1)
                                        .getString("name"));
                    } catch (Exception e) {
                        Log.e("hck", e.toString());
                    }
                };
            });
        }
        public void method4(View view) {
            String urlString = "http://client.azrj.cn/json/cook/cook_list.jsp?";
            final RequestParams params = new RequestParams();
            params.put("type", "1");
            params.put("p", "2");
            params.put("size", "10");
            HttpUtil.get(urlString, params, new AsyncHttpResponseHandler() {
                public void onSuccess(String arg0) {
                    try {
                        JSONObject jObject = new JSONObject(arg0);
                        textView.setText("菜谱名字："
                                + jObject.getJSONArray("list").getJSONObject(2)
                                        .getString("name"));
                        Log.i("hck", params.getEntity().toString());
                    } catch (Exception e) {
                    }
                };
            });
        }
        public void method5(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("可爱的猫咪已经保存在sdcard里面");
                    } catch (Exception e) {
                        e.printStackTrace();
                        Log.i("hck", e.toString());
                    }
                }
            });
        }
    }

    布局文件：


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    <ScrollView
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
          android:gravity="center_horizontal"
        >
        <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
          android:gravity="center_horizontal">
        <TextView
            android:textColor="#FF0000"
            android:textSize="16sp"
           android:layout_marginTop="20dp"
         android:gravity="center_horizontal"
            android:id="@+id/text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="获取数据完成后会显示在这里" />
    <Button
        android:layout_marginTop="50dp"
        android:id="@+id/bt1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第一种"
        android:onClick="method1"
        />
    <Button
        android:id="@+id/bt2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第2种"
        android:onClick="method2"
        />
    <Button
        android:id="@+id/bt3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第3种"
          android:onClick="method3"
        />
    <Button
        android:id="@+id/bt4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第4种"
          android:onClick="method4"
        />
    <Button
        android:id="@+id/bt5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第5种"
          android:onClick="method5"
        />
      <TextView
            android:textColor="#FF0000"
            android:textSize="16sp"
           android:layout_marginTop="20dp"
         android:gravity="center_horizontal"
            android:id="@+id/text2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
             />
    </LinearLayout>
    </ScrollView>

    很简单很实用，上面只是get方法的，上传数据，和这个也差不多，大家自己建个服务器，试试。记得加入网文网络的权限和向sdcard的访问权限
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  • 原文地址：https://www.cnblogs.com/1995hxt/p/4987311.html
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