Android--带你一点点封装项目 MVP+BaseActivity+Retrofit+Dagger+RxJava（一）

1，其实早就想把这些东西给封装封装的，一直没有时间，今天刚好项目进入到测试阶段了，Bug同事在哪儿测试的飞起，但发现提bug的尽然是我（得意脸），然后上午把ios的包测试了一下，顺便把服务器给测挂了（别问我是怎么做到的），现在服务器的同事还在拿着刀满街找我呐。好了不扯了，就想标题写了，一直想把这一块揉在一起写写，那就趁这个机会吧。

先看看今天我们要实现的效果：

2，有些童鞋就很气愤了，麻蛋，裤子都脱了，你给我看这个！！！！

　　 其实我也想多写点的啊，还想把App下载写上呢，没事，我们慢慢一点点的来，，先来看一下我们接口的数据吧

{
    "code": 200,
    "message": "",
    "data": {
        "code": "1.1.0",
        "size": "8.6M",
        "des": "1.【新增】自动更新\\r\\n2.【修改】部分ProgressBar替换为SVG\\r\\n3.【修改】Gank板块部分改动\\r\\n"
    }
}

　　可以看到，这是一个标准的接口数据，外部包含 code、message、data三大门神，这样我们封装Response就很好解决了。

　　看一下我们的BaseResponse类，很简单，没有什么讲的

　　BaseResponse.java

package com.qianmo.myview2.response;

/**
 * Created by wangjitao on 2016/11/8 0008.
 * 数据返回类类
 */
public class BaseResponse<T> {
    private int code;
    private String message;
    private T data;

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }
}

　　再看一下我们这次的功能，就是一个简单的网络请求，判断当前app版本和服务器上的版本，从而判断是否是最新的，看到这里的同学可能就很疑惑了，麻蛋，不是说好了是封装封装嘛，为什么到现在还在说功能，嗯，阿呆哥哥只是想从本质上对比一下如果我们使用传统的MVC去写的话该是怎么写的啊，相信现在很多同学已经在脑海中已经有了代码了，不过我猜你们的Activity中的代码会很多（奸笑脸），好吧，我前面的博客也介绍了MVP模式，现在我们是要把MVP运用在项目里面，所以，我们就要开始封装基类了！！

3 ,封装

①BaseView

我们知道在MVP模式中我们的V是和我们用户界面的UI有关的，不管是控件的隐藏和显示，还是控件大小的改变都是我们的V来处理的，所以这里我们只是写了个简单的夜间模式的UI改变的方法、还有展示错误信息的方法，很简单

package com.qianmo.myview2.base;

import android.view.View;

/**
 * Created by wangjitao on 2016/11/8 0008.
 * 一般的Activity中要用到View操作无非是显示加载框、影藏加载框、显示出错信息、显示当数据为空的时候的view之类的
 */
public interface BaseView {

    void showError(String msg);

    void useNightMode(boolean isNight);

}

　　

②BasePresenter

P在MVP架构中是主要用于逻辑处理的，所以一是我们最经常要写的，看一下代码，就是AttachView和DetachView(这也没什么好解释的)

package com.qianmo.myview2.base;

/**
 * Created by wangjitao on 2016/11/8 0008.
 * MVP框架的简单封装 P处理层
 */
public interface BasePresenter<T extends BaseView> {

    void attachView(T view);

    void detachView();
}

③App

这个类一般用于初始化一些数据，如屏幕的信息之类的和Activity的简单的管理啊，还有一些第三方SDK的初始化

package com.qianmo.myview2;

import android.app.Activity;
import android.app.Application;
import android.content.Context;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.WindowManager;

import java.util.HashSet;
import java.util.Set;

/**
 * Created by wangjitao on 2016/11/8 0008.
 */
public class App extends Application {

    private static App instance;
    private Set<Activity> allActivities;

    public static int SCREEN_WIDTH = -1;
    public static int SCREEN_HEIGHT = -1;
    public static float DIMEN_RATE = -1.0F;
    public static int DIMEN_DPI = -1;

    public static synchronized App getInstance() {
        return instance;
    }

    @Override
    public void onCreate() {
        super.onCreate();

        instance = this;

        getScreenSize();
    }

    /**
     * 初始化屏幕宽高
     */
    public void getScreenSize() {
        WindowManager windowManager = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics dm = new DisplayMetrics();
        Display display = windowManager.getDefaultDisplay();
        display.getMetrics(dm);
        DIMEN_RATE = dm.density / 1.0F;
        DIMEN_DPI = dm.densityDpi;
        SCREEN_WIDTH = dm.widthPixels;
        SCREEN_HEIGHT = dm.heightPixels;
        if (SCREEN_WIDTH > SCREEN_HEIGHT) {
            int t = SCREEN_HEIGHT;
            SCREEN_HEIGHT = SCREEN_WIDTH;
            SCREEN_WIDTH = t;
        }
    }

    /**
     * 添加activity
     */
    public void addActivity(Activity act) {
        if (allActivities == null) {
            allActivities = new HashSet<>();
        }
        allActivities.add(act);
    }

    /**
     * 移除activity
     */
    public void removeActivity(Activity act) {
        if (allActivities != null) {
            allActivities.remove(act);
        }
    }

    /**
     * 退出app
     */
    public void exitApp() {
        if (allActivities != null) {
            synchronized (allActivities) {
                for (Activity act : allActivities) {
                    act.finish();
                }
            }
        }
        android.os.Process.killProcess(android.os.Process.myPid());
        System.exit(0);
    }

    /**
     * 这还有一系列的第三方SDK的初始化
     */
}

④BaseActivity

这个貌似是最重要的，这里我们考虑到5.0一下的机器切换Activity比较丑，所以写了下切换的动画，，然后就是一系列的初始化，直接贴出来吧

package com.qianmo.myview2.base;

import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;

import com.qianmo.myview2.App;
import com.qianmo.myview2.R;

import butterknife.Unbinder;
import butterknife.ButterKnife;

/**
 * Created by wangjitao on 2016/11/8 0008.
 * 基类Activity的封装
 * 一般使用mvp模式的话会在BaseActivity中进行P和V的初始化绑定
 */
public abstract class BaseActivity<T extends BasePresenter> extends AppCompatActivity implements BaseView {
    protected T mPresenter;
    protected Activity mContext;
    private Unbinder mUnbinder;

    public enum TransitionMode {
        LEFT, RIGHT, TOP, BOTTOM, SCALE, FADE
    }

    protected void onCreate(@Nullable Bundle savedInstanceState) {
        if (toggleOverridePendingTransition()) {
            switch (getOverridePendingTransitionMode()) {
                case LEFT:
                    overridePendingTransition(R.anim.left_in, R.anim.left_out);
                    break;
                case RIGHT:
                    overridePendingTransition(R.anim.right_in, R.anim.right_out);
                    break;
                case TOP:
                    overridePendingTransition(R.anim.top_in, R.anim.top_out);
                    break;
                case BOTTOM:
                    overridePendingTransition(R.anim.bottom_in, R.anim.bottom_out);
                    break;
                case SCALE:
                    overridePendingTransition(R.anim.scale_in, R.anim.scale_out);
                    break;
                case FADE:
                    overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
                    break;
            }
        }

        super.onCreate(savedInstanceState);
        setContentView(getLayout());

        mUnbinder = ButterKnife.bind(this);
        mContext = this;

        createPresenter();

        if (mPresenter != null)
            mPresenter.attachView(this);
        App.getInstance().addActivity(this);
        initEventAndData();
    }

    @Override
    protected void onStart() {
        super.onStart();

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mPresenter != null)
            mPresenter.detachView();
        mUnbinder.unbind();
        App.getInstance().removeActivity(this);
    }

    protected void setToolBar(Toolbar toolbar, String title) {
        toolbar.setTitle(title);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                onBackPressed();
            }
        });
    }

    protected abstract int getLayout();

    protected abstract void initEventAndData();

    protected abstract boolean toggleOverridePendingTransition();

    protected abstract TransitionMode getOverridePendingTransitionMode();

    protected abstract void  createPresenter();
}

⑤ BaseRecyclerViewAdapter

package com.qianmo.myview2.base;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.balysv.materialripple.MaterialRippleLayout;
import com.qianmo.myview2.R;

import java.util.List;

/**
 * Created by wangjitao on 2016/11/7 0007.
 * 对简单的recycleview进行简单的封装
 */
public abstract class BaseRecyclerViewAdapter<T> extends RecyclerView.Adapter<BaseViewHolder> {
    private Context context;
    private LayoutInflater inflater;
    private List<T> datas;
    private int layoutId;
    protected OnItemClickListner onItemClickListner;//单击事件
    protected OnItemLongClickListner onItemLongClickListner;//长按单击事件
    private boolean clickFlag = true;//单击事件和长单击事件的屏蔽标识

    public BaseRecyclerViewAdapter(Context context, List<T> datas, int layoutId) {
        this.context = context;
        this.datas = datas;
        this.layoutId = layoutId;
        this.inflater = LayoutInflater.from(context);
    }

    @Override
    public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        BaseViewHolder holder = new BaseViewHolder(inflater.inflate(layoutId, parent, false));
        MaterialRippleLayout.on(holder.getView(R.id.ll_all))
                .rippleOverlay(true)
                .rippleAlpha(0.2f)
                .rippleColor(context.getResources().getColor(R.color.colorAccent))
                .rippleHover(true)
                .create();
        return holder;
    }

    @Override
    public void onBindViewHolder(BaseViewHolder holder, int position) {
        bindData(holder, datas.get(position), position);
    }

    @Override
    public int getItemCount() {
        return datas == null ? 0 : datas.size();
    }

    protected abstract void bindData(BaseViewHolder holder, T data, int position);

    public void setOnItemClickListner(OnItemClickListner onItemClickListner) {
        this.onItemClickListner = onItemClickListner;
    }

    public void setOnItemLongClickListner(OnItemLongClickListner onItemLongClickListner) {
        this.onItemLongClickListner = onItemLongClickListner;
    }

    public interface OnItemClickListner {
        void onItemClickListner(View v, int position);
    }

    public interface OnItemLongClickListner {
        void onItemLongClickListner(View v, int position);
    }
}

⑥ BaseViewHolder

package com.qianmo.myview2.base;

import android.support.v7.widget.RecyclerView;
import android.util.SparseArray;
import android.view.View;

/**
 * Created by wangjitao on 2016/11/7 0007.
 * 万能的Viewholder
 */
public class BaseViewHolder extends RecyclerView.ViewHolder {

    private SparseArray<View> views;

    public BaseViewHolder(View view) {
        super(view);
        this.views = new SparseArray<>();
    }

    public <T extends View> T getView(int viewId) {
        View view = views.get(viewId);
        if (view == null) {
            view = itemView.findViewById(viewId);
            views.put(viewId, view);
        }
        return (T) view;
    }

    public View getRootView() {
        return itemView;
    }
}

由于上一篇介绍了怎么封装RecycleView的Adapter，在这里就不在废话了　　

4，好了东西都封装好了，看一下我们在实际功能中怎么写吧，由于我们上面的功能，我们要实现一个简单的版本判断，由于要使用网络，这里我打算使用Retrofit+RxJava，但是还没有封装好，就直接拿没封装的直接用了,这里创建mvp模式的话要创建好多个接口啊 ，所以推荐是用MVPHelper这个插件，挺好用的  ，好了，先看一下我们的MainContract

package com.qianmo.myview2.contract;

import com.qianmo.myview2.base.BasePresenter;
import com.qianmo.myview2.base.BaseView;
import com.qianmo.myview2.bean.VersionBean;

/**
 * Created by wangjitao on 2016/11/8 0008.
 * 首页逻辑处理
 */
public class MainContract {

    public interface View extends BaseView {
        //View效果就是展示下载进度框
        void showUpdateDialog(VersionBean bean);

        void showProgressDialog();

        void DissProgressDialog();

        void ShowToast(String message);
    }

    public interface Presenter extends BasePresenter<View> {
        //一般在首页我们会进行一个版本的更新（功能）
        void checkVersion(String currentVersion);
    }

}

就只是接口的常见，并把这次功能要用到的方法全部抽象出来，

看一下我们Presenter的实现类

MainPresenterImpl.java

package com.qianmo.myview2.presenter;

import android.widget.Toast;

import com.qianmo.myview2.CheckVersionActivity;
import com.qianmo.myview2.MainActivity;
import com.qianmo.myview2.api.AppVersionService;
import com.qianmo.myview2.bean.VersionBean;
import com.qianmo.myview2.contract.MainContract;
import com.qianmo.myview2.response.BaseResponse;
import com.qianmo.myview2.utils.Constant;

import retrofit2.Retrofit;
import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;
import rx.Subscriber;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;

/**
 * Created by MVPHelper on 2016/11/08
 */

public class MainPresenterImpl implements MainContract.Presenter {

    private MainContract.View mView;

    @Override
    public void checkVersion(final String currentVersion) {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(Constant.BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .build();
        AppVersionService movieService = retrofit.create(AppVersionService.class);

        movieService.getVersion()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Subscriber<BaseResponse<VersionBean>>() {
                    @Override
                    public void onStart() {
                        mView.showProgressDialog();
                    }

                    @Override
                    public void onCompleted() {
                        mView.DissProgressDialog();
                    }

                    @Override
                    public void onError(Throwable e) {
                        mView.DissProgressDialog();
                        mView.ShowToast("请求出错");
                    }

                    @Override
                    public void onNext(BaseResponse<VersionBean> versionBeanBaseResponse) {
                        if (Integer.valueOf(currentVersion.replace(".", "")) < Integer.valueOf(versionBeanBaseResponse.getData().getCode().replace(".", ""))) {
                            // mView.showUpdateDialog(versionBean);
                            //这里表示发现新版本
                            mView.ShowToast("发现最新版本");
                        } else {
                            //表示这就是最新版本
                            mView.ShowToast("已经是最新版本");
                        }
                    }
                });
    }

    @Override
    public void attachView(MainContract.View view) {
        mView = view;
    }

    @Override
    public void detachView() {
        mView = null;
    }

}

没有什么好讲解的，其实还可以把presenter层封装一下的，可以在封装成这样的

public class BasePresenter<T extends MvpView> implements Presenter<T> {

    private T mMvpView;

    @Override
    public void attachView(T mvpView) {
        mMvpView = mvpView;
    }

    @Override
    public void detachView() {
        mMvpView = null;
    }

    public boolean isViewAttached() {
        return mMvpView != null;
    }

    public T getMvpView() {
        return mMvpView;
    }

    public void checkViewAttached() {
        if (!isViewAttached()) throw new MvpViewNotAttachedException();
    }

    public static class MvpViewNotAttachedException extends RuntimeException {
        public MvpViewNotAttachedException() {
            super("Please call Presenter.attachView(MvpView) before" +
                    " requesting data to the Presenter");
        }
    }
}

　　ok，最后看一下我们的Activity

package com.qianmo.myview2;

import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.qianmo.myview2.base.BaseActivity;
import com.qianmo.myview2.bean.VersionBean;
import com.qianmo.myview2.contract.MainContract;
import com.qianmo.myview2.presenter.MainPresenterImpl;

import butterknife.BindView;

public class CheckVersionActivity extends BaseActivity<MainPresenterImpl> implements MainContract.View, View.OnClickListener {
    @BindView(R.id.btn_getVersion)
    Button btnGetVersion;
    @BindView(R.id.progressBar)
    ProgressBar progressBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    protected int getLayout() {
        return R.layout.activity_main;
    }

    @Override
    protected void initEventAndData() {
        btnGetVersion.setOnClickListener(this);

    }

    @Override
    protected boolean toggleOverridePendingTransition() {
        return false;
    }

    @Override
    protected TransitionMode getOverridePendingTransitionMode() {
        return null;
    }

    @Override
    protected void createPresenter() {
        mPresenter = new MainPresenterImpl();
    }

    @Override
    public void showError(String msg) {

    }

    @Override
    public void useNightMode(boolean isNight) {

    }

    @Override
    public void showUpdateDialog(VersionBean bean) {

    }

    @Override
    public void showProgressDialog() {
        progressBar.setVisibility(View.VISIBLE);
    }

    @Override
    public void DissProgressDialog() {
        progressBar.setVisibility(View.GONE);
    }

    @Override
    public void ShowToast(String message) {
        Toast.makeText(mContext, message, Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onClick(View view) {
        try {
            PackageManager pm = getPackageManager();
            PackageInfo pi = pm.getPackageInfo(getPackageName(), PackageManager.GET_ACTIVITIES);
            String versionName = pi.versionName;
            mPresenter.checkVersion(versionName);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
    }
}

　　再贴一下布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="#ffffff"
    >

    <include
        android:id="@+id/toolbar"
        layout="@layout/view_toolbar"/>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycleView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/toolbar"
        android:visibility="gone"
        >

    </android.support.v7.widget.RecyclerView>

    <Button
        android:id="@+id/btn_getVersion"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="400dp"
        android:text="检查版本"
        />

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:visibility="gone"
        />
</RelativeLayout>

　　build.gradle

apply plugin: 'com.android.application'
apply plugin: 'com.neenbedankt.android-apt'
android {
    compileSdkVersion 25
    buildToolsVersion "25.0.0"

    defaultConfig {
        applicationId "com.qianmo.myview2"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:25.0.0'
    compile 'com.android.support:design:25.+'
    compile 'com.android.support:recyclerview-v7:25.+'
    compile 'com.android.support:cardview-v7:25.+'
    compile 'com.balysv:material-ripple:1.0.2'
    compile 'com.jakewharton:butterknife:8.2.1'
    apt 'com.jakewharton:butterknife-compiler:8.2.1'
    compile 'io.reactivex:rxjava:1.1.0'
    compile 'io.reactivex:rxandroid:1.1.0'
    compile 'com.squareup.retrofit2:retrofit:2.0.0-beta4'
    compile 'com.squareup.retrofit2:converter-gson:2.0.0-beta4'
    compile 'com.squareup.retrofit2:adapter-rxjava:2.0.0-beta4'
    compile 'com.google.code.gson:gson:2.6.2'
}

　　好了，这样我们就把MVP简单的封装了，有没有很简单啊，下一篇接着封装Retrofit+Rxjava+Dagger。

see you next time·······