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[操作系统]Android第一次项目

学习了一个月的Android,接触了人生中第一个安卓项目,对于一个小白来说,总结是很重要的学习方法,以下我把学到的东西总结以下:

1. 1》okhttp3用法解析(边贴代码边熟悉)

 

public class OkhttpService {

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

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

//魔盒批量封装 (post提交json数据)
注:RequestBody body = RequestBody.create(JSON, json); //json数据为body
Request是OkHttp中访问的请求,Builder是辅助类。Response即OkHttp中的响应。

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); //将boxProd序列化为json
Request request = new Request.Builder()
.url(route)
.post(RequestBody.create(JSON, json)) //使用Request的post方法来提交请求体RequestBody
.build();
Response response = client.newCall(request).execute();
boolean isOk=response.isSuccessful();
return response.body().string(); //response.body()返回ResponseBody类
}

//网点提交盒子收货上架
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();
}
}
注:以上两个方法需要在前台访问。且需要返回结果提示给前台(接口中需提供 States(返回状态:成功或失败),Description(结果描述),Data(数据)等)

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

2》官方文档总结
(1)配置
导入Jar包
通过构建方式导入=== meaven

(2)基本要求
Request请求
Response响应

(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);
}
}
注:Request是OkHttp中访问的请求,Builder是辅助类,Response即OkHttp中的响应

《--》Http POST

》》》POST提交Json数据

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);
}
}
注:使用Request的post方法来提交请求体RequestBody

》》》POST提交键值对
OkHttp也可以通过POST方式把键值对数据传送到服务器

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

布局文件:
<LinearLayout "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="乌云Get请求"/>

<Button android:id="@+id/bt_post"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="乌云Post请求"/>

LinearLayout>

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

LinearLayout>

Java代码:
由于android本身是不允许在UI线程做网络请求操作的,所以我们自己写个线程完成网络操作

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","打印GET响应的数据:" + 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","打印POST响应的数据:" + response.body().string());
} else {
throw new IOException("Unexpected code " + response);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
}

剩下的简单说明:

   同步Get

       下载一个文件,打印他的响应头,以string形式打印响应体。
       响应体的 string() 方法对于小文档来说十分方便、高效。但是如果响应体太大(超过1MB),应避免适应 string()方法 ,因为他会将把整个文档加载到内存中。对于超过1MB的响应    body,应使用流的方式来处理body。

   异步Get

    在一个工作线程中下载文件,当响应可读时回调Callback接口。读取响应时会阻塞当前线程。OkHttp现阶段不提供异步api来接收响应体。

    

   提取响应头

   典型的HTTP头 像是一个 Map

    

      Post方式提交String

        使用HTTP POST提交请求到服务。这个例子提交了一个markdown文档到web服务,以HTML方式渲染markdown。因为整个请求体都在内存中,因此避免使用此api提交大文        档 (大于1MB)。

 

     待续。。。。。。。。。

     部分出自  http://m.2cto.com/net/201605/505364.html