安卓OKhttp的二次封装

这篇文章实现了OKhttp的二次封装,在封装里实现了请求Json数据,表单的提交,下载图片.

封装的好处:

1.节约内存,使所有的网络请求都用一个OKhttpclient和handler对象2.解决OKhttp,网络请求成功,代码在子线程的问题,把请求成功后的逻辑代码放到主线程中执行3.简化代码

OKhttp的中级封装,实现两个功能,从服务端下载数据;从客户端提交数据

封装优秀的OKhttp:OKhttpUtils,OKGO(更深入的封装,研究OKGO)

这次封装用到了那些知识点:

1.单例模式

2.handler

3.接口

4.OKhttp

我们在使用单例模式时,构造方法一般权限私有,这样保证了对象的唯一性(EventBus,如果看源码的话,他的构造方法是public,所以一方面可以通过单例方法拿到对象,一方面可以通过new方式拿到)

首先,导依赖

compile 'com.squareup.okhttp3:okhttp-ws:3.4.2'

添加网络权限

<uses-permission android:name="android.permission.INTERNET"/>

添加布局

<RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <Button        android:onClick="okhttp_json"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="获取Json数据"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:id="@+id/button2"/>    <Button        android:onClick="okhttp_table"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="表单提交"        android:id="@+id/button3"        android:layout_below="@+id/button2"        android:layout_centerHorizontal="true"/>    <Button        android:onClick="okhttp_picture"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="下载图片"        android:id="@+id/button4"        android:layout_below="@+id/button3"        android:layout_centerHorizontal="true"/>    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/text"        android:layout_below="@id/button4"        android:layout_centerHorizontal="true"        />    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/imageView"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"/></RelativeLayout>

创建一个工具类OKhttpManager

public class OkhttpManager {    ////定义成员变量//    private OkHttpClient mClient;    private static Handler mHandler;    private volatile static OkhttpManager sManager;//防止多个线程同时访问,volatile    ////使用构造方法,完成初始化//    private OkhttpManager() {        mClient = new OkHttpClient();        mHandler = new Handler();    }    ////使用单例模式,通过获取的方式拿到对象//    public static OkhttpManager getInstance() {        OkhttpManager instance = null;        if (sManager == null) {            synchronized (OkhttpManager.class) {                if (instance == null) {                    instance = new OkhttpManager();                    sManager = instance;                }            }        }        return instance;    }    ////定义接口//    interface Func1 {        void onResponse(String result);    }    interface Func2 {        void onResponse(byte[] result);    }    interface Func3 {        void onResponse(JSONObject jsonObject);    }    ////使用handler,接口,保证处理数据的逻辑在主线程//    //处理请求网络成功的方法,返回的结果是json字符串    private static void onSuccessJsonStringMethod(final String jsonValue, final Func1 callBack) {        //这里我用的是mHandler.post方法,把数据放到主线程中,你们以后可以用EvenBus或RXJava的线程调度器去完成        mHandler.post(new Runnable() {            @Override            public void run() {                if (callBack != null) {                    try {                        callBack.onResponse(jsonValue);                    } catch (Exception e) {                        e.printStackTrace();                    }                }            }        });    }    //请求网络成功的方法,返回的结果是byte数组    private static void  onSuccessJsonByteMethod(final byte[] json,final Func2 callBack){        //把数据放到主线程,以后可以用EventBus或RxJava的线程调度器去完成        mHandler.post(new Runnable() {            @Override            public void run() {                if (callBack!=null){                    try {                        callBack.onResponse(json);                    }catch (Exception e){                        e.printStackTrace();                    }                }            }        });    }    ////暴露提供给外界调用的方法//    /**     * 请求指定的URL返回的结果是json字符串     */    public void asyncJsonStringByURL(String url, final Func1 callBack) {        Request request = new Request.Builder().url(url).build();        mClient.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                //判断response是否有对象,成功                if (response!=null&&response.isSuccessful()){                    onSuccessJsonStringMethod(response.body().string(),callBack);                }            }        });    }    /**     * 提交表单     */    public void sendComplexForm(String url, Map<String,String> params,final Func1 callBack){        //表单对象        FormBody.Builder form_builder = new FormBody.Builder();        //健值非空判断        if (params!=null&&!params.isEmpty()){            for (Map.Entry<String,String> entry :params.entrySet()){                form_builder.add(entry.getKey(),entry.getValue());            }        }        FormBody request_body = form_builder.build();        Request request = new Request.Builder().url(url).post(request_body).build();        mClient.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                if (response!=null&&response.isSuccessful()){                    onSuccessJsonStringMethod(response.body().string(),callBack);                }            }        });    }    //下载图片    public void asyncJsonByteByUrl(String url,final Func2 callBack){        Call call = mClient.newCall(new Request.Builder().url(url).build());        call.enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                if(response!=null){                    byte[] bytes = response.body().bytes();                    onSuccessJsonByteMethod(bytes,callBack);                }            }        });    }}

最后再MainActivity中实现效果

public class MainActivity extends AppCompatActivity {    private String json_path = "http://publicobject.com/helloworld.txt";    private String Login_path = "http://169.254.53.96:8080/web/LoginServlet";    private String Picture_path = "https://10.url.cn/eth/ajNVdqHZLLAxibwnrOxXSzIxA76ichutwMCcOpA45xjiapneMZsib7eY4wUxF6XDmL2FmZEVYsf86iaw/";    private ImageView mImageView;    private OkhttpManager mOkhttpManager;    private TextView mTextView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mImageView = (ImageView) findViewById(imageView);        mTextView= (TextView) findViewById(R.id.text);        mOkhttpManager = OkhttpManager.getInstance();    }    /**     * 通过点击事件执行okhttp里封装的根据网址,获取字符串的逻辑操作.     *     * @param view     */    public void okhttp_json(View view) {        mOkhttpManager.asyncJsonStringByURL(json_path,new OkhttpManager.Func1(){            @Override            public void onResponse(String result) {                mTextView.setText(result);            }        });    }    //像服务器提交账号及密码    public void okhttp_table(View view) {        HashMap<String, String> map = new HashMap<>();        map.put("qq","10000");        map.put("pwd","abcde");        mOkhttpManager.sendComplexForm(Login_path, map, new OkhttpManager.Func1() {            @Override            public void onResponse(String result) {                mTextView.setText(result);            }        });    }    //下载图片    public void okhttp_picture(View view) {        mOkhttpManager.asyncJsonByteByUrl(Picture_path, new OkhttpManager.Func2() {            @Override            public void onResponse(byte[] result) {                Bitmap bitmap = BitmapFactory.decodeByteArray(result, 0, result.length);                mImageView.setImageBitmap(bitmap);            }        });    }}

好了,这就简单的实现OKhttp的二次封装.