检查更新并下载

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

implementation 'com.squareup.retrofit2:retrofit:2.4.0'
implementation 'com.squareup.retrofit2:converter-gson:2.4.0'
implementation 'io.reactivex.rxjava2:rxjava:2.1.13'
implementation 'io.reactivex.rxjava2:rxandroid:2.0.2'

implementation 'com.squareup.retrofit2:adapter-rxjava2:2.4.0'

UpdateBean

public class UpdateBean {

    /**
     * msg : 获取版本信息成功
     * code : 0
     * data : {"apkUrl":"https://www.zhaoapi.cn/version/app.apk","desc":"V2.0升级，修复部分bug，优化程序性能！","type":2,"vId":3,
     * "versionCode":"200","versionName":"2.0"}
     */

    private String msg;
    private String code;
    private DataBean data;
    private boolean flag;

    public boolean isFlag() {
        return flag;
    }

    public void setFlag(boolean flag) {
        this.flag = flag;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public String getCode() {
        return code;
    }

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

    public DataBean getData() {
        return data;
    }

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

    public static class DataBean {
        /**
         * apkUrl : https://www.zhaoapi.cn/version/app.apk
         * desc : V2.0升级，修复部分bug，优化程序性能！
         * type : 2
         * vId : 3
         * versionCode : 200
         * versionName : 2.0
         */

        private String apkUrl;
        private String desc;
        private int type;
        private int vId;
        private String versionCode;
        private String versionName;

        public String getApkUrl() {
            return apkUrl;
        }

        public void setApkUrl(String apkUrl) {
            this.apkUrl = apkUrl;
        }

        public String getDesc() {
            return desc;
        }

        public void setDesc(String desc) {
            this.desc = desc;
        }

        public int getType() {
            return type;
        }

        public void setType(int type) {
            this.type = type;
        }

        public int getVId() {
            return vId;
        }

        public void setVId(int vId) {
            this.vId = vId;
        }

        public String getVersionCode() {
            return versionCode;
        }

        public void setVersionCode(String versionCode) {
            this.versionCode = versionCode;
        }

        public String getVersionName() {
            return versionName;
        }

        public void setVersionName(String versionName) {
            this.versionName = versionName;
        }
    }
}

UpdateApi

package com.example.updatedemo.net;

import com.example.updatedemo.bean.UpdateBean;

import io.reactivex.Observable;
import okhttp3.ResponseBody;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;

public class UpdateApi {
    private static UpdateApi updateApi;

    private UpdateApi() {
    }

    public static UpdateApi getUpdateApi() {
        if (updateApi == null) {
            synchronized (UpdateApi.class) {
                if (updateApi == null) {
                    updateApi = new UpdateApi();
                }
            }
        }
        return updateApi;
    }

    public Observable<UpdateBean> update() {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://www.zhaoapi.cn/")
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        UpdateApiService updateApiService = retrofit.create(UpdateApiService.class);
        return updateApiService.update();
    }

    public Observable<ResponseBody> download(String url) {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://www.zhaoapi.cn/")
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        UpdateApiService updateApiService = retrofit.create(UpdateApiService.class);
        return updateApiService.download(url);
    }
}

UpdateApiService

package com.example.updatedemo.net;

import com.example.updatedemo.bean.UpdateBean;

import io.reactivex.Observable;
import okhttp3.ResponseBody;
import retrofit2.http.GET;
import retrofit2.http.Url;

public interface UpdateApiService {
    @GET("quarter/getVersion")
    Observable<UpdateBean> update();

    @GET
    Observable<ResponseBody> download(@Url String url);
}

AppVersion

package com.example.updatedemo.util;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;

public class AppVersion {
    /**
     * 获取版本号
     *
     * @param context
     * @return
     */
    public static int getVersionCode(Context context) {
        PackageInfo pi = null;
        try {
            pi = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return pi.versionCode;
    }
}

MainActivity

package com.example.updatedemo;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;

import com.example.updatedemo.bean.UpdateBean;
import com.example.updatedemo.net.UpdateApi;
import com.example.updatedemo.util.AppVersion;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;

import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.disposables.Disposable;
import io.reactivex.schedulers.Schedulers;
import okhttp3.ResponseBody;

public class MainActivity extends AppCompatActivity {

    private UpdateApi updateApi;
    private File appFile;
    private String apkUrl = "https://www.zhaoapi.cn/version/app.apk";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        File cacheDir = getExternalCacheDir();
        appFile = new File(cacheDir, "app.apk");


        //调用更新接口
        updateApi = UpdateApi.getUpdateApi();
        Observable<UpdateBean> observable = updateApi.update();
        observable.subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<UpdateBean>() {
                    @Override
                    public void onSubscribe(Disposable d) {

                    }

                    @Override
                    public void onNext(UpdateBean updateBean) {
                        //调用更新接口成功，判断是否需要更新
                        String nCode = updateBean.getData().getVersionCode();
                        if (TextUtils.isEmpty(nCode)) {
                            return;
                        }
                        if (checkIsUpdate(Integer.parseInt(nCode))) {
                            //弹出对话框给用户提示是否更新
                            if (updateBean.isFlag()) {
                                alert2(updateBean.getData().getDesc());
                            } else {
                                alert(updateBean);
                            }
                        }
                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onComplete() {

                    }
                });
    }

    private void alert2(String str) {
        new AlertDialog.Builder(MainActivity.this)
                .setTitle("是否更新")
                .setMessage(str)
                .setCancelable(false)
                .setPositiveButton("更新", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        //去下载apk的包

                    }
                }).setNegativeButton("退出", null)
                .show();


    }

    private void alert(final UpdateBean updateBean) {
        new AlertDialog.Builder(MainActivity.this)
                .setTitle("是否更新")
                .setMessage(updateBean.getData().getDesc())
                .setPositiveButton("更新", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        //去下载apk的包
                        apkDownload(updateBean.getData().getApkUrl());
                    }
                }).setNegativeButton("取消", null)
                .show();


    }

    private void apkDownload(String url) {
        Observable<ResponseBody> observable = updateApi.download("version/app.apk");
        observable.subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<ResponseBody>() {
                    @Override
                    public void onSubscribe(Disposable d) {

                    }

                    @Override
                    public void onNext(ResponseBody responseBody) {
                        InputStream inputStream = responseBody.byteStream();

                        //保存到本地sd卡
                        try {
                            FileOutputStream fos = new FileOutputStream(appFile);
                            int len = 0;
                            byte[] buffer = new byte[1024];
                            while ((len = inputStream.read(buffer)) != -1) {
                                fos.write(buffer, 0, len);
                                fos.flush();
                            }
                            fos.close();
                            inputStream.close();
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onComplete() {

                    }
                });
    }

    private boolean checkIsUpdate(int nCode) {
        //拿到当前app的versionCode版本
        int versionCode = AppVersion.getVersionCode(MainActivity.this);
        return versionCode < nCode ? true : false;
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

</android.support.constraint.ConstraintLayout>

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