組件化定義

組件化是建立在模塊化思想上的一次演進，一個變種。組件化本來就是模塊化的概念。核心是模塊角色的可轉化換性，在打包時，是library；調試時，是Application。

組件化的單位是組件，這里跟模塊化的一個最大的區別就是組件之間是可以相互進行跳轉的，其實現就是通過路由，這個在之后會手動來實現這個路由的功能。它是一個編譯時的行為。

組件化優點：

可重用
代碼簡潔
易測試

為什么使用組件化

一直使用單工程操作，項目越來越大導致出現了不少的問題：

查找問題慢：定位問題，需要在多個代碼混合的模塊中尋找和跳轉。
開發維護成本增加：避免代碼的改動影響其它業務的功能，導致開發和維護成本不斷增加。
編譯時間長：項目工程越大，編譯完整代碼所花費的時間越長。
開發效率低：多人協作開發時，開發風格不一，又很難將業務完全分割，大家互相影響，導致開發效率低下。
代碼復用性差：寫過的代碼很難抽離出來再次利用。

組件化項目整體結構

COMPONENTLIB2 LIBRARY項目結構

BUILD.GRADLE

apply plugin: 'com.Android.library'

android {
    compileSdkVersion 28



    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'com.android.support:appcompat-v7:28.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

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APPCONFIG

package com.example.componentlib2;

public class AppConfig {
    public static final String[] COMPONENTS = {
            "com.example.logincomponent.LoginApplication",
            "com.example.minecomponent.MineApplication"
    };
}

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IAPPCOMPONENT

package com.example.componentlib2;

import android.app.Application;

public interface IAppComponent {
    void initalliza(Application app);
}

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package com.example.componentlib2;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;

public interface ILoginService {

    // 跳轉 從主 app  跳轉到 login app
    void launch(Context context, String targetClass);

    //獲取數據主app從login app 獲取返回數據并顯示
    Fragment newUserInfoFragment(FragmentManager fragmentManager, int viewId, Bundle bundle);

}

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IMINESERVICE

package com.example.componentlib2;

import android.content.Context;

public interface IMineService {
    void launch(Context context,int userId);
}

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SERVICEFACTORY

package com.example.componentlib2;

public class ServiceFactory {
    private static final ServiceFactory instance = new ServiceFactory();

    public static ServiceFactory getInstance() {
        return instance;
    }

    private ServiceFactory() {

    }

    private ILoginService mLoginService;
    private IMineService mMineService;


    public ILoginService getLoginService() {
        return mLoginService;
    }

    public void setLoginService(ILoginService mLoginService) {
        this.mLoginService = mLoginService;
    }

    public IMineService getMineService() {
        return mMineService;
    }

    public void setMineService(IMineService mMineService) {
        this.mMineService = mMineService;
    }
}

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LOGINCOMPONENT 組件

LOGINACTIVITY

package com.example.logincomponent;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class LoginActivity extends AppCompatActivity {

    public static String EXTRA_TARGET_CLASS = "extra_target_class";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login_main);
    }
}

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LOGINAPPLICATION

package com.example.logincomponent;

import android.app.Application;

import com.example.componentlib2.IAppComponent;
import com.example.componentlib2.ServiceFactory;

public class LoginApplication extends Application implements IAppComponent {

    private static Application application;

    public static Application getApplication() {
        return application;
    }

    // 當 login 是 application 的時候 調用 initalliza 方法時，上下文指向的就是 LoginApplication
    @Override
    public void onCreate() {
        super.onCreate();
        initalliza(this);
    }

    //當 login是 lib 的時候 被主 App 調用被賦值
    @Override
    public void initalliza(Application app) {
        application = app;
        ServiceFactory.getInstance().setLoginService(new LoginService());
    }
}

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LOGINSERVICE

package com.example.logincomponent;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;

import com.example.componentlib2.ILoginService;

public class LoginService implements ILoginService {

    @Override
    public void launch(Context context, String targetClass) {
        Intent intent = new Intent(context, LoginActivity.class);
        intent.putExtra(LoginActivity.EXTRA_TARGET_CLASS, targetClass);
        context.startActivity(intent);
    }

    @Override
    public Fragment newUserInfoFragment(FragmentManager fragmentManager, int viewId, Bundle bundle) {
        UserInfoFragment fragment = new UserInfoFragment();
        fragment.setArguments(bundle);
        fragmentManager.beginTransaction().add(viewId, fragment).commit();
        return fragment;
    }
}

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USERINFOFRAGMENT

package com.example.logincomponent;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class UserInfoFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.userinfo_fragment, null);
    }
}

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MINECOMPONENT 組件

MINEACTIVITY

package com.example.minecomponent;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MineActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mineactivity_main);
    }
}

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MINEAPPLICATION

package com.example.minecomponent;

import android.app.Application;

import com.example.componentlib2.IAppComponent;
import com.example.componentlib2.ServiceFactory;

public class MineApplication extends Application implements IAppComponent {

    private static Application application;

    public static Application getApplication() {
        return application;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        initalliza(this);
    }

    @Override
    public void initalliza(Application app) {
        application = app;
        ServiceFactory.getInstance().setMineService(new MineService());
    }
}

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MINESERVICE

package com.example.minecomponent;

import android.content.Context;
import android.content.Intent;

import com.example.componentlib2.IMineService;

public class MineService implements IMineService {
    @Override
    public void launch(Context context, int userId) {
        Intent intent = new Intent(context, MineActivity.class);
        intent.putExtra("ID", userId);
        context.startActivity(intent);
    }
}