Android 检测当前APP版本,如果不是最新版本则下载服务端APP并安装

下载和安装APP核心源码
package com.example.myapplication;

import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Handler;
import android.support.v4.content.FileProvider;
import android.util.Log;
import android.widget.Toast;



import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;
import com.squareup.okhttp.ResponseBody;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.TimeUnit;

public class DownloadFile {

    private Context context;

    public DownloadFile(Context context){
        this.context=context;
    }


    /**
     * 下载
     */
    public void download(String targetUrl, String dbName) {
        String filePath = "/sdcard/test/APK";
        File file = new File(filePath);
        if(!file.exists()){
            file.mkdirs();
        }
        download(targetUrl, filePath, dbName);
    }

    /**
     * 通过发送http get 请求获取文件资源
     * @param url 下载文件地址
     * @param filepath 下载到本地途径
     * @param dbName 存放的文件名
     * @return
     */
    private void download(String url, String filepath, String dbName) {
        final ProgressDialog[] progressDialog = new ProgressDialog[1];
        new Handler(context.getMainLooper()).post(new Runnable() {
            @Override
            public void run() {
                progressDialog[0] =new ProgressDialog(context);
                progressDialog[0].setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                progressDialog[0].setTitle("正在下载更新文件");
                progressDialog[0].setMessage("更新进度");
                progressDialog[0].setIcon(android.R.drawable.ic_dialog_alert);
                progressDialog[0].setMax(100);
                progressDialog[0].setProgress(0);
                progressDialog[0].setCancelable(false);
                progressDialog[0].show();
            }
        });


        OkHttpClient client = new OkHttpClient();
        client.setConnectTimeout(30, TimeUnit.SECONDS); // connect timeout
        client.setReadTimeout(30, TimeUnit.SECONDS);    // socket timeout
        Request req = new Request.Builder().url(url).build();
        Response resp = null;
        int len = 0;
        byte[] buf = new byte[2048];
        try {
            resp = client.newCall(req).execute();
            if(resp.isSuccessful()) {
                ResponseBody body = resp.body();
                long total = body.contentLength();
                long sum = 0;
                InputStream is = body.byteStream();
                File imgFile = new File(filepath +"/"+ dbName);

                FileOutputStream fops = new FileOutputStream(imgFile);
                while((len = is.read(buf)) != -1){
                    fops.write(buf,0,len);
                    sum += len;
                    final int progress = (int)(sum * 1.0f / total * 100);
                    new Handler(context.getMainLooper()).post(new Runnable() {
                        @Override
                        public void run() {
                            progressDialog[0].setProgress(progress);
                        }
                    });
                }
                fops.flush();
                fops.close();

                new Handler(context.getMainLooper()).post(new Runnable() {
                    @Override
                    public void run() {
                        if (progressDialog[0].isShowing()) {
                            progressDialog[0].dismiss();//关闭下载进度对话框
                            Toast.makeText(context, "下载完成", Toast.LENGTH_SHORT).show();
                        }
                    }
                });

                installApk(imgFile);
            }
        } catch (final IOException e) {

            new Handler(context.getMainLooper()).post(new Runnable() {
                @Override
                public void run() {
                    if (progressDialog[0].isShowing()) {
                        progressDialog[0].dismiss();//关闭下载进度对话框
                        Toast.makeText(context, e.getMessage(), Toast.LENGTH_SHORT).show();
                    }
                }
            });

        }
    }
    /**
     * 安装apk
     */
    protected void installApk(File apk) {
        if(Build.VERSION.SDK_INT>=24) {//判读版本是否在7.0以上
            Log.i("installApk","start install new apk 1");
            Uri apkUri = FileProvider.getUriForFile(context, "com.lqwvje.update.fileprovider", apk);//在AndroidManifest中的android:authorities值
            Intent install = new Intent(Intent.ACTION_VIEW);
            install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            install.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            install.setDataAndType(apkUri, "application/vnd.android.package-archive");
            context.startActivity(install);
        } else{
            Log.i("installApk","start install new apk 2");
            Intent install = new Intent(Intent.ACTION_VIEW);
            install.setDataAndType(Uri.fromFile(apk), "application/vnd.android.package-archive");
            install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(install);
        }
    }

}
AndroidManifest.xml代码
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapplication">
    <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"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        
        <provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="com.lqwvje.update.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths" />
        </provider>
    </application>

</manifest>
provider_paths.xml代码
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <external-path name="files_root" path="Android/data/com.terminal.ke.electricassis/" />
    <external-path name="external_storage_root" path="." />
</resources>
调用下载
 new DownloadFile(MainActivity.this).download("http://files.zhkh.com/FileData/test/test.apk","update.apk");
注意事项,安装时可能没打开当前APP的读写权限,打开权限的代码如下
private void askForPermission(){
    if (Build.VERSION.SDK_INT >= 23) {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            Log.d("UpdateAcitivty","没有权限");
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    1);
        } else {
            Log.d("UpdateAcitivty","具有权限");
        }
    }else{
        Log.d("UpdateAcitivty","具有权限2");
    }
源码下载链接: https://pan.baidu.com/s/1W0dLU35ubJBs--XBrNX1jw 提取码: 9ud8
原创来自:http://www.luofenming.com/show.aspx?id=ART2020102100001

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