Android第一次項目_ZenDei技術網路在線

學習了一個月的Android，接觸了人生中第一個安卓項目，對於一個小白來說，總結是很重要的學習方法，以下我把學到的東西總結以下： 1. 1》okhttp3用法解析（邊貼代碼邊熟悉）同步Get 下載一個文件，列印他的響應頭，以string形式列印響應體。響應體的 string() 方法對於小文檔來 ...

學習了一個月的Android，接觸了人生中第一個安卓項目，對於一個小白來說，總結是很重要的學習方法，以下我把學到的東西總結以下：

1. 1》okhttp3用法解析（邊貼代碼邊熟悉）

public class OkhttpService  {

    public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8"); //json請求
    public static final MediaType XML = MediaType.parse("application/xml; charset=utf-8");
    private static OkhttpService instance;
    private OkHttpClient client;

    private OkhttpService() {
        client = new OkHttpClient(); //獲取OkthhpClient實例
    }
    public static OkhttpService getInstance() {
        return instance == null ? instance = new OkhttpService() : instance;
    }

    //魔盒批量封裝 (post提交json數據)
    註：RequestBody body = RequestBody.create(JSON, json); //json數據為body
        Request是OkHttp中訪問的請求，Builder是輔助類。Response即OkHttp中的響應。

    public String insertBoxProd(List<BoxProdInfo>  boxProd)throws IOException{
        HttpUrl route = HttpUrl.parse("http://115.29.165.110:8085/RfService.svc/V1.0/Mh/InsertBoxProd/");
        String json = new Gson().toJson(boxProd); //將boxProd序列化為json
        Request request = new Request.Builder()
                .url(route)
                .post(RequestBody.create(JSON, json)) //使用Request的post方法來提交請求體RequestBody
                .build();
        Response response = client.newCall(request).execute();
        boolean  isOk=response.isSuccessful();
        return response.body().string();  //response.body()返回ResponseBody類

}

    //網點提交盒子收貨上架
    public String receiverBox(String userCode, List<BoxReceiverInfo> boxReceiverInfos)throws IOException{
        HttpUrl route=HttpUrl.parse("http://115.29.165.110:8085/RfService.svc/V1.0/Mh/ReceiveBox/")
                .newBuilder()
                .addPathSegment(userCode)
                .build();
        String json=new Gson().toJson(boxReceiverInfos);
        Request request=new Request.Builder()
                .url(route)
                .put(RequestBody.create(JSON,json))
                .build();
        Response response=client.newCall(request).execute();
        boolean  isOk=response.isSuccessful();
        return response.body().string();
    }
}
註：以上兩個方法需要在前臺訪問。且需要返回結果提示給前臺（介面中需提供 States（返回狀態：成功或失敗），Description（結果描述），Data(數據)等）

eg：String  result = OkhttpService.getInstance().receiverBox(userCode,boxReceiverInfos).toString();

2》官方文檔總結

(1)配置
    導入Jar包
    通過構建方式導入=== meaven

(2)基本要求
  Request請求
  Response響應

(3)基本使用
 《--》Http  GET

 okHtttpClient  client=new okHtttpClient();

 String run(String  url)throws  IOException{
     Request request = new Request.Builder().url(url).build();
     Response response = client.newCall(request).execute();
    if (response.isSuccessful()) {
       return response.body().string();
    }else{
     throw new IOException("Unexpected code " + response);
    }
}
註：Request是OkHttp中訪問的請求，Builder是輔助類，Response即OkHttp中的響應

《--》Http POST
 
》》》POST提交Json數據

public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");
OkHttpClient client = new OkHttpClient();
String post(String url, String json) throws IOException {
    RequestBody body = RequestBody.create(JSON, json);
    Request request = new Request.Builder()
    .url(url)
    .post(body) 
    .build();
    Response response = client.newCall(request).execute();
    if (response.isSuccessful())
    { 
        return response.body().string(); 
    } else
    { 
        throw new IOException("Unexpected code " + response);
    }
}
註：使用Request的post方法來提交請求體RequestBody

》》》POST提交鍵值對
OkHttp也可以通過POST方式把鍵值對數據傳送到伺服器

OkHttpClient client = new OkHttpClient(); 
String post(String url, String json) throws IOException { 
    RequestBody formBody = new FormEncodingBuilder()
    .add("platform", "android") 
    .add("name", "bug") 
    .add("subject", "XXXXXXXXXXXXXXX")
    .build();

    Request request = new Request.Builder() 
    .url(url)
    .post(body) 
    .build();

    Response response = client.newCall(request).execute(); 
    if (response.isSuccessful()) 
    {
        return response.body().string(); 
    } else {
        throw new IOException("Unexpected code " + response); 
    }
}

(3)案例

佈局文件：
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:orientation="vertical"> 
  
      <LinearLayout android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:gravity="center_horizontal"
       android:orientation="horizontal">
               <Button android:id="@+id/bt_get" 
               android:layout_width="wrap_content" 
               android:layout_height="wrap_content" 
               android:text="烏雲Get請求"/> 
 
               <Button android:id="@+id/bt_post" 
               android:layout_width="wrap_content" 
               android:layout_height="wrap_content" 
               android:text="烏雲Post請求"/>

 LinearLayout> 

     <TextView android:id="@+id/tv_show" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"/> 

LinearLayout>

Java代碼：
由於android本身是不允許在UI線程做網路請求操作的，所以我們自己寫個線程完成網路操作

import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button;
import com.squareup.okhttp.FormEncodingBuilder; 
import com.squareup.okhttp.OkHttpClient; 
import com.squareup.okhttp.Request; 
import com.squareup.okhttp.RequestBody; 
import com.squareup.okhttp.Response;

public class MainActivity extends AppCompatActivity implements View.OnClickListener { 

       private Button bt_get;
       private Button bt_post; 
       final OkHttpClient client = new OkHttpClient();
       
       @Override 
       protected void onCreate(Bundle savedInstanceState) { 
       super.onCreate(savedInstanceState); 
       setContentView(R.layout.activity_main2);
       bt_get=(Button)findViewById(R.id.bt_get); 
       bt_post=(Button)findViewById(R.id.bt_post); 
       bt_get.setOnClickListener(this); 
       bt_post.setOnClickListener(this); 
   }
   @Override 
   public void onClick(View view) { 
       switch (view.getId()){
            case R.id.bt_get: 
               getRequest(); 
               break; 
 
            case R.id.bt_post: 
               postRequest();
               break; 
       } 
   }
   private void getRequest() {
        final Request request=new Request.Builder()
             .get() 
             .tag(this) 
             .url("http://www.wooyun.org") 
             .build();
        new Thread(new Runnable() { 
            @Override 
            public void run() {
                 Response response = null;
                 try {
                         response = client.newCall(request).execute();
                         if (response.isSuccessful()) {
                              Log.i("WY","列印GET響應的數據：" + response.body().string());
                         } else {
                             throw new IOException("Unexpected code " + response);
                         } 
                     } catch (IOException e) { 
                      e.printStackTrace(); 
                     }
              }
        }).start(); 
   }

   private void postRequest() {
        RequestBody formBody = new FormEncodingBuilder() 
              .add("","") 
              .build();
        final Request request = new Request.Builder() 
              .url("http://www.wooyun.org") 
              .post(formBody)
              .build(); 
        new Thread(new Runnable() {
            @Override
            public void run() { 
                Response response = null; 
                try {
                     response = client.newCall(request).execute();
                     if (response.isSuccessful()) {
                          Log.i("WY","列印POST響應的數據：" + response.body().string());
                     } else {
                          throw new IOException("Unexpected code " + response);
                     }
                } catch (IOException e) {
                     e.printStackTrace(); 
                }
             }
         }).start();
   }
}

剩下的簡單說明：