MVVM

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main:

  private ActivityMainBinding amb;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);      //  setContentView(R.layout.activity_main);        amb = DataBindingUtil.setContentView(this, R.layout.activity_main);        User user = new User("张三",30,"http://img2.cache.netease.com/auto/2016/7/28/201607282215432cd8a.jpg");       amb.setUser(user);    }

OkHttp3Utils:

    private static OkHttp3Utils okHttp3Utils = null;    private OkHttp3Utils() {    }    public static OkHttp3Utils getInstance() {        if (okHttp3Utils == null) {            //加同步安全            synchronized (OkHttp3Utils.class) {                if (okHttp3Utils == null) {                    okHttp3Utils = new OkHttp3Utils();                }            }        }        return okHttp3Utils;    }    private static OkHttpClient okHttpClient = null;    public synchronized static OkHttpClient getOkHttpClient() {        if (okHttpClient == null) {            //判空 为空创建实例            // okHttpClient = new OkHttpClient();/** * 和OkHttp2.x有区别的是不能通过OkHttpClient直接设置超时时间和缓存了，而是通过OkHttpClient.Builder来设置， * 通过builder配置好OkHttpClient后用builder.build()来返回OkHttpClient， * 所以我们通常不会调用new OkHttpClient()来得到OkHttpClient，而是通过builder.build()： */            //  File sdcache = getExternalCacheDir();            //缓存目录            File sdcache = new File(Environment.getExternalStorageDirectory(), "cache");            int cacheSize = 10 * 1024 * 1024;            //OkHttp3拦截器            HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() {                @Override                public void log(String message) {                    Log.i("xxx", message.toString());                }            });            //Okhttp3的拦截器日志分类 4种            httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);            okHttpClient = new OkHttpClient.Builder().connectTimeout(15, TimeUnit.SECONDS)                    //添加OkHttp3的拦截器                    .addInterceptor(httpLoggingInterceptor)                    .writeTimeout(20, TimeUnit.SECONDS).readTimeout(20, TimeUnit.SECONDS)                  //  .cache(new Cache(sdcache.getAbsoluteFile(), cacheSize))                    .build();        }        return okHttpClient;    }    private static Handler mHandler = null;    public synchronized static Handler getHandler() {        if (mHandler == null) {            mHandler = new Handler();        }        return mHandler;    }    /**     * get请求     * 参数1 url     * 参数2 回调Callback     */    public static void doGet(String url, Callback callback) {        //创建OkHttpClient请求对象        OkHttpClient okHttpClient = getOkHttpClient();        //创建Request 在这里添加header        Request request = new Request.Builder().url(url).header("User-Agent","ok").        build();        //得到Call对象        Call call = okHttpClient.newCall(request);        //执行异步请求        call.enqueue(callback);    }    /**     * post请求     * 参数1 url     * 参数2 回调Callback     */    public static void doPost(String url, Map<String, String> params, Callback callback) {        //创建OkHttpClient请求对象        OkHttpClient okHttpClient = getOkHttpClient();        //3.x版本post请求换成FormBody 封装键值对参数        FormBody.Builder builder = new FormBody.Builder();        //遍历集合        for (String key : params.keySet()) {            builder.add(key, params.get(key));        }        //创建Request        Request request = new Request.Builder().url(url).post(builder.build()).build();        Call call = okHttpClient.newCall(request);        call.enqueue(callback);    }    /**     * post请求上传文件     * 参数1 url     * 参数2 回调Callback     */    public static void uploadPic(String url, File file, String fileName) {        //创建OkHttpClient请求对象        OkHttpClient okHttpClient = getOkHttpClient();        //创建RequestBody 封装file参数        RequestBody fileBody = RequestBody.create(MediaType.parse("application/octet-stream"), file);        //创建RequestBody 设置类型等        RequestBody requestBody = new MultipartBody.Builder().setType(MultipartBody.FORM).addFormDataPart("file", fileName, fileBody).build();        //创建Request        Request request = new Request.Builder().url(url).post(requestBody).build();        //得到Call        Call call = okHttpClient.newCall(request);        //执行请求        call.enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                //上传成功回调 目前不需要处理            }        });    }    /**     * Post请求发送JSON数据     * 参数一：请求Url     * 参数二：请求的JSON     * 参数三：请求回调     */    public static void doPostJson(String url, String jsonParams, Callback callback) {        RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), jsonParams);        Request request = new Request.Builder().url(url).post(requestBody).build();        Call call = getOkHttpClient().newCall(request);        call.enqueue(callback);    }    /**     * 下载文件 以流的形式把apk写入的指定文件 得到file后进行安装     * 参数一：请求Url     * 参数二：保存文件的路径名     * 参数三：保存文件的文件名     */    public static void download(final Context context, final String url, final String saveDir) {        Request request = new Request.Builder().url(url).build();        Call call = getOkHttpClient().newCall(request);        call.enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {                Log.i("xxx", e.toString());            }            @Override            public void onResponse(Call call, final Response response) throws IOException {                InputStream is = null;                byte[] buf = new byte[2048];                int len = 0;                FileOutputStream fos = null;                try {                    is = response.body().byteStream();                    //apk保存路径                    final String fileDir = isExistDir(saveDir);                    //文件                    File file = new File(fileDir, getNameFromUrl(url));                    fos = new FileOutputStream(file);                    while ((len = is.read(buf)) != -1) {                        fos.write(buf, 0, len);                    }                    fos.flush();                    //apk下载完成后 调用系统的安装方法                    Intent intent = new Intent(Intent.ACTION_VIEW);                    intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");                    context.startActivity(intent);                } catch (IOException e) {                    e.printStackTrace();                } finally {                    if (is != null) is.close();                    if (fos != null) fos.close();                }            }        });    }    /**     * @param saveDir     * @return     * @throws IOException 判断下载目录是否存在     */    public static String isExistDir(String saveDir) throws IOException {        // 下载位置        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            File downloadFile = new File(Environment.getExternalStorageDirectory(), saveDir);            if (!downloadFile.mkdirs()) {                downloadFile.createNewFile();            }            String savePath = downloadFile.getAbsolutePath();            Log.e("savePath", savePath);            return savePath;        }        return null;    }    /**     * @param url     * @return 从下载连接中解析出文件名     */    private static String getNameFromUrl(String url) {        return url.substring(url.lastIndexOf("/") + 1);    }
USER:public String name;public int age;public String imgUrl;public User() {}public User(String name, int age, String imgUrl) {    this.name = name;    this.age = age;    this.imgUrl = imgUrl;}public String getName() {    return name;}public void setName(String name) {    this.name = name;}public int getAge() {    return age;}public void setAge(int age) {    this.age = age;}public String getImgUrl() {    return imgUrl;}public void setImgUrl(String imgUrl) {    this.imgUrl = imgUrl;}//@BindingAdapter("bind:imgUrl")@BindingAdapter("bind:imgUrl")public static void getImg(ImageView iv,String imgUrl){    Picasso.with(iv.getContext()).load(imgUrl).into(iv);}
layout:

<?xml version="1.0" encoding="utf-8"?><layout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto">    <data>        <variable            name="user"            type="ccc.ww.mvvm.User"></variable>    </data>    <LinearLayout        android:layout_width="match_parent"        android:orientation="vertical"        android:layout_height="wrap_content">        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@{user.name}"            />        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@{String.valueOf(user.age)}" />        <ImageView            android:layout_width="wrap_content"            app:imgUrl="@{user.imgUrl}"            android:layout_height="wrap_content"/>    </LinearLayout>    </layout>

dataBinding{    enabled true}
依赖：

compile 'com.squareup.picasso:picasso:2.5.1'compile 'com.squareup.okio:okio:1.5.0'compile 'com.squareup.okhttp3:okhttp:3.2.0'compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'compile 'com.google.code.gson:gson:2.8.2'

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