1.
apply plugin: 'com.google.protobuf'
buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.1'
    }
}
android {
    sourceSets {
        main {
            proto {
                srcDir 'src/main/proto'
                include '**/*.proto'
            }
            java {
                srcDir 'src/main/java'
            }
        }
    }
}
protobuf {
    plugins {
        javalite {
            artifact = 'com.google.protobuf:protoc-gen-javalite:3.0.0'
        }
    }
    generateProtoTasks {
        all().each { task ->
            task.plugins {
                javalite { }
            }
        }
    }
    generatedFilesBaseDir = "$projectDir/src/generated"
}
2.
compile 'com.google.protobuf:protobuf-lite:3.0.0'

image.png

syntax = "proto2";
option java_package = "com.xxx.xxx.bean";
option java_outer_classname = "PersonEntity";//生成的数据访问类的类名
message Person {  
  required int32 id = 1;
  required string name = 2;
  optional string email = 3;
} 

mAsyncHandler.post(()->{
                    PersonEntity.Person person = PersonEntity.Person.newBuilder()
                            .setId(11)
                            .setName("tom")
                            .setEmail("979713144@qq.com")
                            .build();

                    File dir = Environment.getExternalStorageDirectory();
                    File file = new File(dir, "book");
                    try {
                        FileOutputStream outputStream = new FileOutputStream(file);
                        person.writeTo(outputStream);
                        outputStream.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                });

mAsyncHandler.post(()->{
                    File dir2 = Environment.getExternalStorageDirectory();
                    File file2 = new File(dir2, "book");
                    try {
                        FileInputStream inputStream = new FileInputStream(file2);
                        PersonEntity.Person person2 = PersonEntity.Person.parseFrom(inputStream);
                        log("person = " + person2.toString());
                        inputStream.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                });