Android(安卓)中使用Protocol Buffer

宝宝其实是根据一老外的文章学习的，原文：
https://medium.com/@elye.project/simple-android-protobuf-tutorial-with-actual-code-bfb581299f47
本篇文章主要介绍Android中配置Gradle Protocol Buffer，及一个简单的使用demo，下篇文件讲解API

在其中一个项目中遇到SharedPerfernce 插入数据时报ANR，弄的我是有口难言，谁叫我滥用SP呢？
无意中在一本讲python的书中讲到protobuf，研究之，兴奋之，撸之！其实我的原本的想法是把protobuf
封装成SharedPerfernce这样的方式既能快速使用，又能提升性能。于是protobuf处女作

宝宝在marven上面找到最新的插件，可以看出，上面已经开始落满了灰。但是有名言不是说了么，
酒香不怕巷子深，猪肉不怕年头陈。

截至2018/05/20
在mvnrepository 上面找到最新的 protobuf-gradle-plugin 0.8.5下面是官网
http://mvnrepository.com/artifact/com.google.protobuf/protobuf-gradle-plugin/0.8.5
Protocol Buffers [Lite] 最新的3.0.1
http://mvnrepository.com/artifact/com.google.protobuf/protobuf-lite
protoc 最新的为 3.5.1
http://mvnrepository.com/artifact/com.google.protobuf/protoc
:protoc-gen-javalite 最新的为 3.0.0

http://mvnrepository.com/artifact/com.google.protobuf/protoc-gen-javalite

AndroidStudio Project build.gradle

buildscript {    repositories {        jcenter()        google()    }    dependencies {        classpath 'com.android.tools.build:gradle:3.0.1'        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.5'    }}allprojects {    repositories {        jcenter()        google()    }}task clean(type: Delete) {    delete rootProject.buildDir}

application build.gradle

apply plugin: 'com.android.application'apply plugin: 'com.google.protobuf'android {    compileSdkVersion 25    buildToolsVersion '26.0.2'    defaultConfig {        applicationId "com.example.rxjavademo"        minSdkVersion 15        targetSdkVersion 25        versionCode 1        versionName "1.0"        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }    repositories {        flatDir {            dirs 'libs'        }    }}protobuf {    protoc {        artifact = 'com.google.protobuf:protoc:3.5.1-1'    }    plugins {        javalite {            artifact = 'com.google.protobuf:protoc-gen-javalite:3.0.0'        }    }    generateProtoTasks {        all().each { task ->            task.builtins {                remove java            }            task.plugins {                javalite {}            }        }    }}dependencies {    compile fileTree(include: ['*.jar'], dir: 'libs')    compile 'com.android.support:appcompat-v7:25.3.1'    compile 'com.android.support.constraint:constraint-layout:1.0.2'    compile 'io.reactivex.rxjava2:rxjava:2.0.1'    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'    implementation 'com.google.protobuf:protobuf-lite:3.0.1'    implementation 'com.squareup.okhttp3:okhttp:3.8.0'}

在main 文件夹下创建proto文件夹，编写.proto文件

dataformat.proto文件

syntax = "proto3";package tutorial;message Person {    string name = 1;    int32 id = 2;    string email = 3;    string phone = 4;        map pairs = 5;}

编译项目，会在build文件夹下proto文件夹内生成对应的java文件

下面就可以愉快的玩耍了

Activity中代码，里面是使用okhttp请求网络，接收到protobuf的byte字节转成java对象

package com.example.rxjavademo;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.widget.TextView;import io.reactivex.Observable;import io.reactivex.android.schedulers.AndroidSchedulers;import io.reactivex.functions.Consumer;import io.reactivex.functions.Function;import io.reactivex.schedulers.Schedulers;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;import okhttp3.ResponseBody;import tutorial.Dataformat.Person;public class ProtocalActivity extends AppCompatActivity {    private OkHttpClient okHttpClient = new OkHttpClient();    private Observable observable = Observable.just("http://elyeproject.x10host.com/experiment/protobuf")            .map(new Function, Person>() {                @Override                public Person apply(String url) throws Exception {                    Request request = new Request.Builder().url(url).build();                    okhttp3.Call call = okHttpClient.newCall(request);                    Response response = call.execute();                    if (response.isSuccessful()) {                        ResponseBody responseBody = response.body();                        if (responseBody != null) {                            return Person.parseFrom(responseBody.byteStream());                        }                    }                    return null;                }            }).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread());    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_protocal);        observable.subscribe(new Consumer() {            @Override            public void accept(Object object) throws Exception {                showResult((Person) object);            }        });    }    private void showResult(Person result) {        TextView textView = (TextView) findViewById(R.id.txt_main);        textView.setText(result.toString());//        result.writeTo();//         Person.Builder builder = Person.newBuilder();//         builder.putPairs();    }}

效果图

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